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From: jrmjoseph@videotron.ca
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message-id: <fc1ac6d1f219.49e1a79a@videotron.ca>
Date: Sun, 12 Apr 2009 08:34:34 -0400
Content-language: fr
Subject: Re : [FlyRotary] Re: Gary Casey was [FlyRotary] Re: Rotary Engines
Priority: normal
In-reply-to: <list-3578061@logan.com>
References: <list-3578061@logan.com>

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Also Mistral with an inadequate muffler=2E=3CBR=3E=26nbsp=3B=3CBR=3EMarc=
 Joseph=3CBR=3E=3CBR=3E----- Message d=27origine -----=3CBR=3EDe=3A Mark=
 Steitle =26lt=3Bmsteitle=40gmail=2Ecom=26gt=3B=3CBR=3EDate=3A Dimanche=2C=
 12 Avril 2009=2C 7=3A46=3CBR=3EObjet=3A =5BFlyRotary=5D Re=3A Gary Case=
y was =5BFlyRotary=5D Re=3A Rotary Engines=3CBR=3E=C0=3A Rotary motors i=
n aircraft =26lt=3Bflyrotary=40lancaironline=2Enet=26gt=3B=3CBR=3E=3CBR=3E=
=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-ST=
YLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=
Mike=2C =3CBR=3E=3CBR=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT=
-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EHas anyone ever tried to document the rotary inci=
dents resulting in a forced landing=3F=3CBR=3E=3CBR=3E=3CFONT style=3D=22=
FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BA=
CKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EHere=27s what I rec=
all from memory=2C so it likely is missing a few=3B=3CBR=3E=26nbsp=3B=3C=
BR=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FO=
NT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FO=
NT=3E=26nbsp=3B=26nbsp=3B=26nbsp=3B 3 forced landings due to ruptured oi=
l coolers =3CBR=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A=
 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26g=
t=3B =3C/FONT=3E=26nbsp=3B=26nbsp=3B=26nbsp=3B 1 forced landing due to a=
pex seal coming out of its slot (rotor out of spec)=3CBR=3E=3CFONT style=
=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=
=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=26nbsp=3B=26=
nbsp=3B=26nbsp=3B 1 forced landing due to improper assembly of engine (s=
eal wedged between rotor =26amp=3B side housing)=3CBR=3E=3CFONT style=3D=
=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B=
 BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=26nbsp=3B=26nbs=
p=3B=26nbsp=3B 1 forced landing on highway due to catastrophic overheati=
ng of engine=3CBR=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZ=
E=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=
=26gt=3B =3C/FONT=3E=26nbsp=3B=26nbsp=3B=26nbsp=3B 2 forced landings (on=
e fatal) due to probable fuel system design flaw=26nbsp=3B =3CBR=3E=3CFO=
NT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A=
 normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=26nbs=
p=3B=26nbsp=3B=26nbsp=3B 1 forced landing on highway due to ingestion of=
 FOD=2E=26nbsp=3B =3CBR=3E=3CBR=3E=3CFONT style=3D=22FONT-WEIGHT=3A norm=
al=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23=
f5f8f0=22=3E=26gt=3B =3C/FONT=3EThere were a few others=2C such as turbo=
 failures which allowed for continued operation at reduced power=2C so w=
e may or may not wish to include those here=2E=26nbsp=3B =3CBR=3E=3CBR=3E=
=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-ST=
YLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=
While a number of these incidents date back quite a few years=2C and we =
have made excellent progress=2C it says to me that we still have room fo=
r improvement in the peripheral department=2E=26nbsp=3B The good news is=
 that out of all of the incidents listed above=2C none of them were caus=
ed by a true engine failure=2E=26nbsp=3B That=27s where the rotary has r=
eally earned my respect as a viable a/c engine=2E=3CBR=3E=3CBR=3E=3CFONT=
 style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A =
normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EPay att=
ention to the details! =3CBR=3E=3CBR=3E=3CFONT style=3D=22FONT-WEIGHT=3A=
 normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=
=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EMark S=2E =3CBR=3E=3CBR=3E=3CBR=3E=
=3CBR=3E
=3CDIV class=3Dgmail=5Fquote=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B=
 FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f=
8f0=22=3E=26gt=3B =3C/FONT=3EOn Sat=2C Apr 11=2C 2009 at 9=3A22 PM=2C Mi=
ke Wills =3CSPAN dir=3Dltr=3E=26lt=3B=3CA href=3D=22javascript=3Amain=2E=
compose(=27new=27=2C=27t=3Drv-4mike=40cox=2Enet=27)=22=3Erv-4mike=40cox=2E=
net=3C/A=3E=26gt=3B=3C/SPAN=3E wrote=3A=3CBR=3E
=3CBLOCKQUOTE class=3Dgmail=5Fquote style=3D=22PADDING-LEFT=3A 1ex=3B MA=
RGIN=3A 0pt 0pt 0pt 0=2E8ex=3B BORDER-LEFT=3A rgb(204=2C204=2C204) 1px s=
olid=22=3E
=3CDIV lang=3DEN-US bgcolor=3D=22=23ffffff=22 link=3D=22blue=22 vlink=3D=
=22blue=22=3E=3CFONT face=3DArial size=3D2=3E=3CFONT style=3D=22FONT-WEI=
GHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND=
-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EThis has been an interestin=
g thread=2E In the end=2C it doesnt really matter how many =22major=22 p=
arts you have - even a minor failure can bring you down=2E While I belie=
ve the basic rotary engine itself is more fault tolerant than a recip=2C=
 the peripherals used in the typical rotary install are a lot more compl=
ex than a typical recip install=2E Since we rotary fliers dont have the =
benefit of 70 years worth of experience flying behind the typical LyCon =
farm implement I think overall our odds are considerably worse=2E Comes =
down to how well an individual engineer=27s his installation and there i=
s a tremendous amount of variation here=2E=3C/FONT=3E=3CBR=3E=26nbsp=3B=3C=
BR=3E=3CFONT face=3DArial size=3D2=3E=3CFONT style=3D=22FONT-WEIGHT=3A n=
ormal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A=
 =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EThe dependence on electronics in the=
 typical rotary install=26nbsp=3B is a good example=2E I may be a little=
=26nbsp=3Bsensitive to this issue since I=27ve been trying to find an in=
termittent glitch (2 times in 22 hours of engine testing)=2E=3C/FONT=3E=3C=
BR=3E=26nbsp=3B=3CBR=3E=3CFONT color=3D=23888888=3E=3CFONT face=3DArial =
size=3D2=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=
=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =
=3C/FONT=3EMike Wills=3C/FONT=3E=3CBR=3E=3CFONT face=3DArial size=3D2=3E=
=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-ST=
YLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=
RV-4 N144MW=3C/FONT=3E=26nbsp=3B=26nbsp=3B=3CBR=3E=3C/FONT=3E
=3CBLOCKQUOTE dir=3Dltr style=3D=22PADDING-RIGHT=3A 0px=3B PADDING-LEFT=3A=
 5px=3B MARGIN-LEFT=3A 5px=3B BORDER-LEFT=3A rgb(0=2C0=2C0) 2px solid=3B=
 MARGIN-RIGHT=3A 0px=22=3E
=3CDIV class=3Dim=3E
=3CDIV style=3D=22FONT=3A 10pt arial=3B font-size-adjust=3A none=3B font=
-stretch=3A normal=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT=
-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3E----- Original Message ----- =3CBR=3E
=3CDIV style=3D=22BACKGROUND=3A rgb(228=2C228=2C228)=3B FONT=3A 10pt ari=
al=3B font-size-adjust=3A none=3B font-stretch=3A normal=3B -moz-backgro=
und-clip=3A -moz-initial=3B -moz-background-origin=3A -moz-initial=3B -m=
oz-background-inline-policy=3A -moz-initial=22=3E=3CB=3E=3CFONT style=3D=
=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B=
 BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EFrom=3A=3C/B=3E =
=3CA href=3D=22javascript=3Amain=2Ecompose(=27new=27=2C=27t=3Deanderson=40=
carolina=2Err=2Ecom=27)=22 target=3D1=3EEd Anderson=3C/A=3E =3CBR=3E
=3CDIV style=3D=22FONT=3A 10pt arial=3B font-size-adjust=3A none=3B font=
-stretch=3A normal=22=3E=3CB=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B=
 FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f=
8f0=22=3E=26gt=3B =3C/FONT=3ETo=3A=3C/B=3E =3CA href=3D=22javascript=3Am=
ain=2Ecompose(=27new=27=2C=27t=3Dflyrotary=40lancaironline=2Enet=27)=22 =
target=3D1=3ERotary motors in aircraft=3C/A=3E =3CBR=3E=3CBR=3E=3CBR=3E
=3CDIV class=3Dh5=3E
=3CDIV style=3D=22FONT=3A 10pt arial=3B font-size-adjust=3A none=3B font=
-stretch=3A normal=22=3E=3CB=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B=
 FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f=
8f0=22=3E=26gt=3B =3C/FONT=3ESent=3A=3C/B=3E Saturday=2C April 11=2C 200=
9 7=3A31 AM=3CBR=3E
=3CDIV style=3D=22FONT=3A 10pt arial=3B font-size-adjust=3A none=3B font=
-stretch=3A normal=22=3E=3CB=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B=
 FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f=
8f0=22=3E=26gt=3B =3C/FONT=3ESubject=3A=3C/B=3E =5BFlyRotary=5D Gary Cas=
ey was =5BFlyRotary=5D Re=3A Rotary Engines=3CBR=3E=3CBR=3E=3CBR=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EGood anal=
ysis and logic=2C Gary=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EYou=92d m=
ake a good addition to the =93rotary community=94=2E=26nbsp=3B I have no=
ticed over the 10 years I have been flying my rotary powered RV-6A that =
the problems have decreased considerably=2C the success rate and complet=
ion rate has gone up and first flights are now occurring without signifi=
cant problems =96 even cooling is OK =7B=3A=26gt=3B)=2E=26nbsp=3B I beli=
eve most of this improvement can be attributed to folks sharing their kn=
owledge=2C problems and solutions with others - such as on this list=2E=26=
nbsp=3B =3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EI know th=
at fewer parts count is often touted as one of the rotary benefit =96 an=
d while it is true that the part count is lower=2C the most significant =
thing (in my opinion) is not only does the lower part count help reliabi=
lity (if it is not there =96 it can not break)=2C but if you look a the =
design of the eccentric shaft (for example) you notice the absence of th=
e jogs in a typical crankshaft and their stress points=2E=26nbsp=3B The =
thing is over 3=94 in diameter at some points and does not have the same=
 inertia loads born by a piston crankshaft=2E=26nbsp=3B The parts that a=
re there are of very robust design=2E=26nbsp=3B Finally=2C the rotary is=
 (I believe) more tolerant of damage and tends to fail =93gradually and =
gracefully=94=2C it can take a licking and keep on ticking as the old sa=
ying goes=2E=26nbsp=3B Only extended time and numbers will provide the t=
rue MTBF for the rotary=2C but I believe it looks very promising=2E=3C/S=
PAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EFailure o=
f rotary engines are extremely rare=2C but unfortunately=2C as with many=
 alternative engine installations=2C auxiliary subsystems such as fuel a=
nd ignition frequently being one-off designs have been the cause of most=
 failures =96 with probably fuel the prime culprit=2E=26nbsp=3B The good=
 news is that for some platforms (such as the RVs) we have pretty much e=
stablished what will make an installation successful=2E=26nbsp=3B The Ca=
nard crowd is fast approaching that status with their somewhat more chal=
lenging cooling requirements being over come=2E=3C/SPAN=3E=3C/FONT=3E=3C=
/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=26nbsp=3B=
 Having lost a rotor during flight due to putting in high compression ro=
tors with worn apex seal slots worn beyond specs (found this out later =96=
 my fault for not being aware of this spec limit and checking it) which =
led to apex seal failure and consequence lost of most of the power from =
one rotor=2C I was still able to maintain 6500 MSL at WOT and fuel mixtu=
re knob to full rich =96 flowing 14=2E5 GPH =96 a lot of it undoubtedly =
=26nbsp=3Bbeing blown through the disabled rotor=2E=26nbsp=3B Flew it ba=
ck 60 miles to a suitable runway and made a non-eventful landing=2E=26nb=
sp=3B=26nbsp=3B There was a small increase in vibration due to the power=
 strokes no longer being balanced=2C but nothing bad and you could still=
 read the needles on the gauges=2E=26nbsp=3B Other folks have had FOD da=
mage to a rotor and also make it to a safe landing=2E=26nbsp=3B Two folk=
s lost cooling (one loss of coolant fluid =2C one lost of water pump) an=
d while they did cook the engines=2C both made it back to a safe landing=
=2E=26nbsp=3B So all things considered=2C I think the rotary continues t=
o show that if the installation is designed properly=2C it makes a very =
viable and reliable aircraft power plant=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=

=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EFailure o=
f rotary engines in aircraft are extremely rare=2C but unfortunately=2C =
as with many alternative engine installations=2C auxiliary subsystems su=
ch as fuel and ignition frequently being one-off designs - have been the=
 cause of most failures=2E=26nbsp=3B The good news is that for some plat=
forms (such as the RVs) we have pretty much established what will make a=
n installation successful=2E=26nbsp=3B The Canard crowd is fast approach=
ing that status with their somewhat more challenging cooling requirement=
s being over come=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EMy rotary=
 installation cost me =246500 back in 1996=2C the primary cost being a r=
ebuilt engine =242000 and the PSRU =242900=2E=26nbsp=3B I have since pur=
chased a 1991 turbo block engine from Japan for =24900 and rebuilt it my=
self for another =242200=2E =26nbsp=3BMy radiators (GM evaporator cores)=
 cost =245=2E00 from the junk yard and another =2450=2E00 each for havin=
g the bungs welded on=2E=26nbsp=3B So depending on how much you buy and =
how much you build the price can vary considerably=2E=26nbsp=3B Today=2C=
 I would say it would take a minimum of around =248000 and more nominall=
y around =2410000 for a complete rotary installation in an RV =96 some f=
olks could do it for less=2C some for more=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=
=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EBut=2C re=
gardless of the technical merit (or not) in someone=92s mind=2C the cruc=
ial thing (in my opinion) is you need to address two personal factors=3A=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E1=2E=26nb=
sp=3B What is your risk tolerance=3F=26nbsp=3B It doesn=92t really matte=
r how sexy some =93exotic=94 engine installation may seem =96 if you are=
 not comfortable flying behind (or in front) of it=2C then it certainly =
does not =26nbsp=3Bmakes sense to go that route=2E=26nbsp=3B After all=2C=
 this is supposed to have an element of fun and enjoyment to it=2E=3C/SP=
AN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E2=2E=26nb=
sp=3B What is your knowledge=2C experience and background (and you don=92=
t have to be an engineer) and do you feel comfortable with the level of =
involvement needed=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3ESo hope y=
ou continue to contribute to expanding our knowledge and understanding o=
f the rotary in its application to power plant for aircraft=2E=3C/SPAN=3E=
=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EBest Rega=
rds=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CFONT s=
tyle=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A no=
rmal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EEd=3C/SPA=
N=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=26nbsp=3B=
=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN lang=3DEN st=
yle=3D=22FONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=
=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-ST=
YLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=
Ed Anderson=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN lang=3DEN st=
yle=3D=22FONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=
=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-ST=
YLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=
Rv-6A N494BW Rotary Powered=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN lang=3DEN st=
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YLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=
Matthews=2C NC=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
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yle=3D=22FONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=
=3CA href=3D=22javascript=3Amain=2Ecompose(=27new=27=2C=27t=3Deanderson=40=
carolina=2Err=2Ecom=27)=22 target=3D1=3E=3CFONT style=3D=22FONT-WEIGHT=3A=
 normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=
=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3Eeanderson=40carolina=2Err=2Ecom=3C=
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=3D=22http=3A//www=2Eandersonee=2Ecom/=22 target=3D1=3E=3CSPAN lang=3DEN=
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=3Ehttp=3A//www=2Eandersonee=2Ecom=3C/SPAN=3E=3C/A=3E=3C/SPAN=3E=3C/FONT=
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yle=3D=22FONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=
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ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CA href=
=3D=22http=3A//members=2Ecox=2Enet/rogersda/rotary/configs=2Ehtm=22 targ=
et=3D1=3E=3CSPAN lang=3DEN=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B=
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8f0=22=3E=26gt=3B =3C/FONT=3Ehttp=3A//members=2Ecox=2Enet/rogersda/rotar=
y/configs=2Ehtm=23N494BW=3C/SPAN=3E=3C/A=3E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=

=3CP=3E=3CFONT face=3DArial color=3Dnavy size=3D2=3E=3CSPAN style=3D=22F=
ONT-SIZE=3A 10pt=3B COLOR=3A navy=3B FONT-FAMILY=3A Arial=22=3E=3CA href=
=3D=22http=3A//www=2Erotaryaviation=2Ecom/Rotorhead=2520Truth=2Ehtm=22 t=
arget=3D1=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14p=
x=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B=
 =3C/FONT=3Ehttp=3A//www=2Erotaryaviation=2Ecom/Rotorhead=2520Truth=2Eht=
m=3C/A=3E=3CA href=3D=22http=3A//www=2Edmack=2Enet/mazda/index=2Ehtml=22=
 target=3D1=3E=3C/A=3E=3C/SPAN=3E=3C/FONT=3E=3CFONT face=3DArial size=3D=
2=3E=3CSPAN style=3D=22FONT-SIZE=3A 10pt=3B FONT-FAMILY=3A Arial=22=3E=3C=
/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CDIV style=3D=22TEXT-ALIGN=3A center=22 align=3Dcenter=3E=3CFONT face=3D=
=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22FONT-SIZE=3A 12pt=22=
=3E
=3CHR align=3Dcenter width=3D=22100=25=22 SIZE=3D2=3E
=3C/SPAN=3E=3C/FONT=3E=3CBR=3E
=3CP=3E=3CB=3E=3CFONT face=3DTahoma size=3D2=3E=3CSPAN style=3D=22FONT-W=
EIGHT=3A bold=3B FONT-SIZE=3A 10pt=3B FONT-FAMILY=3A Tahoma=22=3E=3CFONT=
 style=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A =
normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3EFrom=3A=
=3C/SPAN=3E=3C/FONT=3E=3C/B=3E=3CFONT face=3DTahoma size=3D2=3E=3CSPAN s=
tyle=3D=22FONT-SIZE=3A 10pt=3B FONT-FAMILY=3A Tahoma=22=3E Rotary motors=
 in aircraft =5Bmailto=3A=3CA href=3D=22javascript=3Amain=2Ecompose(=27n=
ew=27=2C=27t=3Dflyrotary=40lancaironline=2Enet=27)=22 target=3D1=3Eflyro=
tary=40lancaironline=2Enet=3C/A=3E=5D =3CB=3E=3CSPAN style=3D=22FONT-WEI=
GHT=3A bold=22=3EOn Behalf Of =3C/SPAN=3E=3C/B=3EGary Casey=3CBR=3E=3CB=3E=
=3CSPAN style=3D=22FONT-WEIGHT=3A bold=22=3E=3CFONT style=3D=22FONT-WEIG=
HT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-=
COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3ESent=3A=3C/SPAN=3E=3C/B=3E S=
aturday=2C April 11=2C 2009 8=3A36 AM=3CBR=3E=3CB=3E=3CSPAN style=3D=22F=
ONT-WEIGHT=3A bold=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT=
-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3ETo=3A=3C/SPAN=3E=3C/B=3E Rotary motors in aircraf=
t=3CBR=3E=3CB=3E=3CSPAN style=3D=22FONT-WEIGHT=3A bold=22=3E=3CFONT styl=
e=3D=22FONT-WEIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A norma=
l=3B BACKGROUND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3ESubject=3A=3C=
/SPAN=3E=3C/B=3E =5BFlyRotary=5D Re=3A Rotary Engines=3C/SPAN=3E=3C/FONT=
=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EJust to add a few more comments and answers to th=
e several excellent comments posted=3A=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CB=
R=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EHow many parts does it take to make a rotary rota=
te=3F =26nbsp=3BWell=2C =22parts aren=27t parts=22 in this case=2E =26nb=
sp=3BMark was right in that there are maybe 4 =22major=22 components=2C =
but you have to define major=2E =26nbsp=3BA piston engine certainly has =
far more major parts=2E =26nbsp=3BIs a valve a =22major=22 part=3F =26nb=
sp=3BI think so=2E =26nbsp=3BIs a rotor corner button a major part=3F =26=
nbsp=3BNot sure=2C but probably not=2E =26nbsp=3BIs each planet gear in =
the PSRU a major part=3F =26nbsp=3BI say yes=2C and the PSRU is an integ=
ral part of the rotary engine=2E =26nbsp=3BAs someone correctly pointed =
out=2C it=27s not how many parts=2C but the reliability of the total sys=
tem that counts=2E =26nbsp=3BJust looking at the history of the rotary (=
which=2C from the implication of another post) it=27s not that good=2C b=
ut I don=27t think it has anything to do with reliability of the concept=
=2E =26nbsp=3BIt=27s more to do with the experimental nature of the buil=
ds and installations=2E =26nbsp=3BMy original point=2C perhaps not well =
expressed is that to say there are just 4 parts is an oversimplification=
=2E =26nbsp=3BBut let=27s face it=2C to put in an engine that has had ma=
ny thousands of identical predecessors is less =22experimental=22 than o=
ne that hasn=27t=2E=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EAre we ES drivers more conservative=3F =26nbsp=3B=
Probably so=2C since the ES is probably one of the experimentals most si=
milar to production aircraft=2C and not just because the Columbia (can=27=
t force myself to say Cezzna =3A-) was a derivative=2E =26nbsp=3BTherefo=
re=2C it tends to attract conservative builders and owners=2E =26nbsp=3B=
Not surprising then that almost all ES=27s have traditional powerplants=2C=
 with the most excellent exception of Mark=2E =26nbsp=3BWhile there may =
be more=2C I know of only two off-airport landings caused by engine fail=
ures in the ES in almost 20 years of experience=2E =26nbsp=3BOne was cau=
sed by fuel starvation right after takeoff (fatal) and one was caused by=
 a PSRU failure in an auto engine conversion=2E =26nbsp=3BSo our old-fas=
hioned conservative nature has served us pretty well=2E=3C/SPAN=3E=3C/FO=
NT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EYes=2C I was assuming that the rotary had electro=
nic fuel injection and ignition=2C but that by itself doesn=27t change t=
he inherent fuel efficiency of the engine=2E =26nbsp=3BDirect injection =
does have a potential to improve BSFC because the fuel charge can be str=
atified=2E =26nbsp=3BIt will probably decrease available power=2C though=
=2E =26nbsp=3BI think the best rotary will be 5=25 less efficient than t=
he =22best=22 piston engine(same refinements added to each)=2E =26nbsp=3B=
But I stated that as a simple disadvantage - as Mark pointed out=2C it i=
sn=27t that simple=2E =26nbsp=3BThe rotary already comes configured to r=
un on auto gas=2E =26nbsp=3BThe piston engine can also be so configured=2C=
 but the compression ratio reduction would reduce its BSFC and maybe dur=
ability advantage=2E =26nbsp=3BThe total operating cost is certainly sig=
nificantly less if auto gas can always be used to refuel=2E =26nbsp=3BI =
assumed in my assessment that it will only be available 50=25 of the tim=
e=2E =26nbsp=3BThe real disadvantage=2C which I failed to state=2C is th=
at the extra fuel required for a given mission might be 5 or 10=25 highe=
r and that negated the weight advantage=2C if only for long-range flight=
s=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EIs the engine less expensive=3F =26nbsp=3BI did a=
 thorough analysis of a direct-drive recip auto engine installation and =
my conclusion was that if the auto engine were equivalent in reliability=
 to the aircraft engine it would likely cost just as much=2E =26nbsp=3BI=
s the same true of the rotary=3F =26nbsp=3BI=27m not sure=2C but you hav=
e to consider the total cost=2C including engineering of all the parts i=
n the system=2C not just the core engine=2E =26nbsp=3BI would love to do=
 a rotary installation=2C but I don=27t think I could justify it by cost=
 reduction=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EIt wasn=27t mentioned in the posts=2C but some ha=
ve claimed the rotary is =22smoother=22 than a recip=2E =26nbsp=3BI at f=
irst resisted that notion=2E =26nbsp=3BSure=2C any rotary given sufficie=
nt counterbalancing=2C is perfectly balanced=2E =26nbsp=3BA 4-cylinder o=
pposed recip is not - there is a significant secondary couple=2E =26nbsp=
=3BThe 6-cylinder opposed engine is perfectly balanced=2C but only for P=
RIMARY and SECONDARY forces and couples - higher order forces have never=
 really been analyzed=2C although they would be very small=2E =26nbsp=3B=
And then consider the forces within the engine that have to be resisted =
by that long=2C heavy=2C but flexible crankshaft=2E =26nbsp=3BSo it isn=27=
t the mechanical balance that gives the rotary an advantage=2E =26nbsp=3B=
Let=27s take a look at the the torsional pulsations=2C comparing the 3-r=
otor against the 6-cylinder=3A =26nbsp=3BA 6-cylinder engine has 3 power=
 impulses per rotation=2C as does the 3-rotor=2C so they are the same=2C=
 right=3F =26nbsp=3BWrong=2E =26nbsp=3BThey both incorporate 4 =22stroke=
=22 cycles=2C meaning that there separate and sequential intake=2C compr=
ession=2C power and exhaust events so that is the same for both=2E =26nb=
sp=3BThe power event=2C which is the source of the torque impulse=2C=26n=
bsp=3Btakes 1/2 of a crank rotation for the recip=2E =26nbsp=3BIn the ro=
tary the power event requires 1/4 of a ROTOR rotation=2C but the rotor r=
otates at 1/3 crank rotation - the result is that the power impulse last=
s 3/4 of a CRANK rotation=2C 50=25 longer than in a recip=2E =26nbsp=3BT=
herefore=2C the torsional excitation delivered to the propeller=2C PSRU =
and to the airframe is significantly less than for a recip=2E =26nbsp=3B=
And if you analyze the actual forces imparted=2C they go down by the squ=
are of the rpm=2E =26nbsp=3BThe torsional vibration amplitude goes down =
by a factor of 4 just because the rpm of the rotary turns about twice as=
 fast=2E =26nbsp=3BIf you=27ve skipped to the bottom of the paragraph=2C=
 as you probably should have =3A-)=2C yes the rotary is =22smoother=22 -=
 a LOT smoother=2E=2E (my apologies to rotary purists=2C for simplicity =
I used the word =22crankshaft=22 for both engines)=3C/SPAN=3E=3C/FONT=3E=
=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EBut just because you can burn auto gas should you=
=3F =26nbsp=3BThe biggest problems with auto gas in recip aircraft have =
nothing to do with the engine=2C but with the high vapor pressure of the=
 fuel - it is more prone to vapor lock=2E =26nbsp=3BThe fuel systems of =
certified aircraft are not particularly well designed with regard to vap=
or lock=2E =26nbsp=3B=22Fortunately=22=2C rotary engines typically have =
no mechanical fuel pump and are forced to rely on electric pumps=2E =26n=
bsp=3BFortunately because the pumps can be located at the very bottom of=
 the aircraft and close to the fuel tanks=2C making vapor lock much less=
 likely=2E =26nbsp=3BI would caution any builders to consider vapor lock=
 possibilities very seriously=2C much more so if you intend to run auto =
gas=2E =26nbsp=3Bwhen I was going to do this I planned to put one electr=
ic pump in the wing root of each wing=2C feeding the engine directly(the=
 check valve in the non-running pump prevents back-feeding)=2E =26nbsp=3B=
Redundancy was by a =22crossfeed=22 line that could connect the tanks to=
gether=2E=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EAnd thanks=2C Mark for - probably incorrectly - r=
eferring to me as a =22good engineer=22=2E =26nbsp=3BI=27ll have to put =
that in my resume!=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EHave a good day=2C=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3C=
BR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3EGary=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CFONT style=3D=22FONT-WEIGHT=3A normal=3B FONT-=
SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROUND-COLOR=3A =23f5f8f0=22=
=3E=26gt=3B =3C/FONT=3E(do you allow us outsiders in your events=3F =26n=
bsp=3BI=27ll park well away =3A-)=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=26nbsp=3B=3C/SPAN=3E=3C/FONT=3E=3C/P=3E=3CBR=3E=3C=
BR=3E=3CBR=3E
=3CP=3E=3CFONT face=3D=22Times New Roman=22 size=3D3=3E=3CSPAN style=3D=22=
FONT-SIZE=3A 12pt=22=3E=3CBR=3E=3CBR=3E=3CBR=3E=3CFONT style=3D=22FONT-W=
EIGHT=3A normal=3B FONT-SIZE=3A 14px=3B FONT-STYLE=3A normal=3B BACKGROU=
ND-COLOR=3A =23f5f8f0=22=3E=26gt=3B =3C/FONT=3E=5F=5F=5F=5F=5F=5F=5F=5F=5F=
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--Boundary_(ID_tBppdvDgO1/jKPfLtXcafQ)--