X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm24-vm0.access.bullet.mail.sp2.yahoo.com ([98.139.44.182] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with SMTP id 5053401 for flyrotary@lancaironline.net; Fri, 15 Jul 2011 23:04:39 -0400 Received-SPF: none receiver=logan.com; client-ip=98.139.44.182; envelope-from=keltro@att.net Received: from [98.139.44.103] by nm24.access.bullet.mail.sp2.yahoo.com with NNFMP; 16 Jul 2011 03:04:04 -0000 Received: from [98.139.44.83] by tm8.access.bullet.mail.sp2.yahoo.com with NNFMP; 16 Jul 2011 03:04:04 -0000 Received: from [127.0.0.1] by omp1020.access.mail.sp2.yahoo.com with NNFMP; 16 Jul 2011 03:04:04 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 502643.37897.bm@omp1020.access.mail.sp2.yahoo.com Received: (qmail 97631 invoked by uid 60001); 16 Jul 2011 03:04:04 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=att.net; s=s1024; t=1310785444; bh=jlreBcNBin4K+/vx887IGj2ZGwwitLx/IYgenER9bF8=; 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Fri, 15 Jul 2011 20:04:04 PDT X-Mailer: YahooMailWebService/0.8.112.307740 References: Message-ID: <1310785444.95361.YahooMailNeo@web83903.mail.sp1.yahoo.com> Date: Fri, 15 Jul 2011 20:04:04 -0700 (PDT) From: Kelly Troyer Reply-To: Kelly Troyer Subject: Re: Flex Plate Failure - Improvements To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1687541259-1310785444=:95361" --0-1687541259-1310785444=:95361 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mark,=0A=C2=A0=0A=C2=A0=C2=A0=C2=A0 You just may have found a lightweight, = relatively easy to implement,=C2=A0inexpensive fix !!................=0A=0A= Kelly Troyer=0A"DYKE DELTA JD2" (Eventually)=0A"13B ROTARY"_ Engine=0A"RWS"= _RD1C/EC2/EM2=0A"MISTRAL"_Backplate/Oil Manifold=0A"TURBONETICS"_TO4E50 Tur= bo=0A=0AFrom: Mark Steitle =0ATo: Rotary motors in airc= raft =0ASent: Friday, July 15, 2011 8:13 PM=0A= Subject: [FlyRotary] Re: Flex Plate Failure - Improvements=0A=0A=0AKelly, = =0A=0AI don't see why not. =C2=A0The diameter of ring gears is the same; = =C2=A0and the dimension from where the flex plate mates to the counterweigh= t to the outer face of the ring gear is the same (1.250"). =C2=A0But I will= have to fit-test it to be 100% certain.=0A=0A=0AMark=0A=0A=0A=0AOn Fri, Ju= l 15, 2011 at 8:04 PM, Kelly Troyer wrote:=0A=0AMark,=0A>= =C2=A0=C2=A0=C2=A0 Will your existing starter still ingage the ring gear pr= operly??..........=0A>=0A>=0A>Kelly Troyer=0A>"DYKE DELTA JD2" (Eventually)= =0A>"13B ROTARY"_ Engine=0A>"RWS"_RD1C/EC2/EM2=0A>"MISTRAL"_Backplate/Oil M= anifold=0A>"TURBONETICS"_TO4E50 Turbo=0A>=0A>=0A>From: Mark Steitle =0A>=0A>To: Rotary motors in aircraft =0A>Sent: Friday, July 15, 2011 7:48 PM =0A>=0A>Subject: [FlyRotary] = Re: Flex Plate Failure - Improvements=0A>=0A>=0A>=0A>Guys, =0A>=0A>=0A>I re= moved the flex plate from my 20B today and found a crack. =C2=A0So, as they= say, "I now have skin in the game." =C2=A0I was out in the garage tonight,= contemplating this problem and a possible solution came to me. =C2=A0I'll = run it by you guys here and see what you think. =C2=A0 =0A>=0A>=0A>Comparin= g the 20B flex plate to a picture on the Mazdatrix web site, it appears tha= t the 20B auto flex plate is identical to the Renesis auto flex plate. =C2= =A0The outer dimensions (ring gear) and offset from eccentric shaft flange = to outer edge of ring gear of the 20B flex plate is the same as the 13B pla= te I removed from my 20B today. =C2=A0The Renesis/20B plate has a more grad= ual dish shape than the 13B, and is thicker too. =C2=A0Since I had a spare = 20B flex plate and a spare 13B flex plate, I took a few quick measurements,= and it looks like the 13B flex plate could be easily made to nest down ins= ide the 20B plate by removing the 13B's ring gear. =C2=A0That would allow f= or the two plates to be bolted together using the four 20B outer bolt holes= along with the six crank bolts in the center (when installing on engine). = =C2=A0Then the existing redrive adapter plate could be attached using the o= riginal four existing bolts existing in the 13B plate. =C2=A0This would lea= ve the RD2-C aluminum adapter plate offset by the thickness of the 20B flex plate= (.090"), and would result in a much stronger flex plate. =C2=A0I calculate= this would increase the FWF weight by about 4 lbs.=C2=A0 =C2=A0=C2=A0=0A>= =0A>=0A>Comments? =C2=A0=0A>=0A>=0A>Mark S. in TX=0A>=0A>=0A>=0A>=0A>On Fri= , Jul 15, 2011 at 6:32 PM, Kelly Troyer wrote:=0A>=0A>Dave= , Tracy and All,=0A>>=C2=A0=0A>>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Lates= t update is that probably the substitution of a turbo starter should elimin= ate the apparent=0A>>need to add another starter ring gear on top of the "A= CT" flywheel I have on order since this flywheel=0A>>is susposed to fit any= 86-95 with=C2=A0Turbo flywheel (and starter)=C2=A0and 04-08 RX8 with=C2=A0= manual trans......=0A>>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Will keep all apprais= ed of what I find out when flywheel arrives..............=0A>>=0A>>Kelly Tr= oyer=0A>>"DYKE DELTA JD2" (Eventually)=0A>>"13B ROTARY"_ Engine=0A>>"RWS"_R= D1C/EC2/EM2=0A>>"MISTRAL"_Backplate/Oil Manifold=0A>>"TURBONETICS"_TO4E50 T= urbo=0A>>=0A>>=0A>>From: David Leonard =0A>>To: Rotary= motors in aircraft =0A>>Sent: Friday, July 15= , 2011 5:50 PM=0A>>Subject: [FlyRotary] Re: Flex Plate Failure - Improvemen= ts=0A>>=0A>>=0A>>=0A>>Thanks for chiming in Tracy.=C2=A0 I have also though= t about making an intermediate plate for the RX8 flex plate, so far I am in= clined to go with a flywheel, but adapting the RX8 flex plate is gaining gr= ound in my mind.=0A>>=0A>>As far as light weight steel fly wheels, mazdatri= x sells one that weighs=C2=A018 lbs (including counter weight)=C2=A0and cos= ts $350, and Kelly Troyer found=C2=A0(and bought) one on the Internet that = weighs=C2=A013.8 lbs and is made of chome-molly-b and sells for $205.=C2=A0= Of course, looks like either would require the addition of another ring ge= ar weighing a couple pounds and costing $80.=C2=A0 I'll wait to hear Kelly'= s report on the flywheel he bought.=0A>>=0A>>-- =0A>>David Leonard=0A>>=0A>= >Turbo Rotary RV-6 N4VY=0A>>http://N4VY.RotaryRoster.net=0A>>http://RotaryR= oster.net=0A>>=0A>>=0A>>=0A>>On Fri, Jul 15, 2011 at 11:41 AM, Tracy wrote:=0A>>=0A>>I'm still in analysis mode on this myself.= =0A>>>=0A>>>So far the possibilities are:=0A>>>=0A>>>1. The flex plate may = have been warped when installed=C2=A0 ( I bought several that were)=C2=A0 I= think the standard should be close to zero runout or wobble on the flexpla= te in view of this failure.=0A>>>=0A>>>2.=C2=A0 The flexplate could have ha= d cracks when installed=C2=A0 (I also bought several that had cracks and th= ey were not visible unless you looked closely)=0A>>>=0A>>>3.=C2=A0 The dang= things (RX-7 flexplates) are not strong enough for boosted 13Bs or 20Bs.= =C2=A0 =0A>>>=0A>>>I do NOT think the problem is fore & aft travel of the i= nput shaft.=C2=A0 The RD-1x drives have had thrust bearings from day one.= =C2=A0 There is no thrust load at all on the damper, flexplate or crankshaf= t imposed by the drive.=C2=A0=C2=A0 This was not the case with the Ross dri= ve I used at first.=0A>>>=0A>>>I have over 1000 hours on the same flexplate= on my NA 13B.=C2=A0 I have only 55 hours on the 20B.=C2=A0=C2=A0 But I'll = be checking both.=C2=A0 I did inspect both flexplates VERY carefully before= installing.=C2=A0 =0A>>>=0A>>>If I found that a change were necessary, I w= ould consider two possibilities. =0A>>>=0A>>>1.=C2=A0 Use a modified alumin= um racing flywheel used with an auto counterweight.=C2=A0 (Or possibly a li= ghtweight steel one if there is such a thing)=0A>>>=0A>>>2.=C2=A0 Use an RX= -8 flexplate with an adapter plate made of aluminum or steel sheet to go be= tween the flexplate and damper.=C2=A0 The RX-8 version looks stronger than = the RX-7. I briefly studied this when good RX-7 flexplates were getting har= d to find. =C2=A0 I did not develop a formal procedure for doing this but i= t looked like it would be pretty easy.=C2=A0 Anybody with spare time out th= ere want to take a closer look?=C2=A0 Hint: =C2=A0 The damper bolt pattern = would be offset 45 degrees from the RX-8 torque converter bolt pattern.=0A>= >>=C2=A0=0A>>>Tracy Crook,=C2=A0=C2=A0 RWS =0A>>>=0A>>>=0A>>>=0A>>>On Fri, = Jul 15, 2011 at 1:47 PM, Bobby J. Hughes wrote:=0A>>>=0A= >>>Bill summed up what I=E2=80=99ve been thinking the last few days. I=E2= =80=99m not changing anything until Tracy makes a recommendation. It could = be fore and aft movement on the shaft, flex plate out of round, worn rubber= isolators or a combination of all these items. We may need a scheduled mai= ntenance plan to replace items like the rubber isolators or other items tha= t wear and loosen tolerances.=0A>>>>=C2=A0=0A>>>>=C2=A0=0A>>>>=C2=A0I will = however be inspecting for this problem before most flights. =0A>>>>=C2=A0= =0A>>>>Bobby Hughes=0A>>>>=C2=A0(playing with fiberglass again)=0A>>>>From:= Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of= Bill Bradburry=0A>>>>Sent: Friday, July 15, 2011 10:03 AM=0A>>>>To: Rotary= motors in aircraft=0A>>>>Subject: [FlyRotary] Re: Ok Here are the importan= t flywheel measurements=0A>>>>=C2=A0=0A>>>>=C2=A0=0A>>>>David,=0A>>>>=C2=A0= =0A>>>>I can=E2=80=99t help but think that you may be fixing something that= is not broken.=C2=A0 I realize that the flexplate came apart on your plane= , but that doesn=E2=80=99t mean that the flexplate is the cause of the prob= lem.=C2=A0 That flexplate holds up quite well in the car with a heavy torqu= e converter attached to it.=C2=A0 Think of the forces when a car under heav= y acceleration changes gear! As long as the forces are along the plane of t= he plate it is very strong.=C2=A0 Not so much in the forward/rearward direc= tions.=C2=A0 In fact that would cause metal fatigue and cause it to break j= ust like yours did.=C2=A0 I think that what ever is causing the endplay is = what you should be looking at.=C2=A0 I suspect that if you check out the tr= ansmission on the car you will find that the endplay of the input shaft is = controlled by thrust bearings or some such device.=C2=A0 Lynn may know the = answer to this??=0A>>>>=C2=A0=0A>>>>That msg from Al Wick really resonates = with me.=C2=A0 Tracy had to install a thrust bearing to prevent the drive s= haft from hitting the bottom of the pilot bearing and causing an eccentric = shaft failure on the engine.=C2=A0 Maybe you now need to add a cage similar= to what Al was discussing that will trap the shaft end play completely.=C2= =A0 That, to me, makes more sense than adding a bigger flywheel.=C2=A0 If y= ou strengthen the weak spot, you will then discover where the next weakest = spot is because that will be the next failure!=C2=A0 =0A>>>>=C2=A0=0A>>>>Th= is is a real opportunity for you and the rest of us with the same drive.=C2= =A0 Please study this a little more before you begin the fix!=0A>>>>=C2=A0= =0A>>>>Bill B=0A>>>>=C2=A0=0A>>>>From:Rotary motors in aircraft [mailto:fly= rotary@lancaironline.net] On Behalf Of David Leonard=0A>>>>Sent: Friday, Ju= ly 15, 2011 12:42 AM=0A>>>>To: Rotary motors in aircraft=0A>>>>Subject: [Fl= yRotary] Ok Here are the important flywheel measurements=0A>>>>=C2=A0=0A>>>= >I finally got to the hangar and measured out my S5 turbo flywheel and the = remains of my S5 flexplate.=C2=A0 The results are very encouraging, even as= good as the possibly could be to make the swap, but I only had ten min at = the hangar before I had to leave to pick up my daughter from daycare, so th= ey are one try and slightly sloppy... I make no guarantees.=C2=A0 The heigh= t measurements of the flex plate were particularly suspect because, well, m= ine is all warped and broken.=0A>>>>=0A>>>>Ring Gear Diameter - Perfect fit= .=C2=A0 As we suspected, same size, same tooth spacing.=0A>>>>=0A>>>>Ring G= ear Fore-Aft Placement - As measured from the underside of the big nut. (fo= r all further reference, aft means aft in the CAR).=C2=A0 The flex plate pu= ts the aft side of the ring gear 1.290 inches from the front of the big nut= . The flywheel puts it 0.913.=C2=A0 So the flex plate puts the ring gear (a= ppx) 0.377 in. further aft.=C2=A0 This is actually fortuitous because it ju= st so happens that the ring gear thickness is .365 ...=C2=A0=C2=A0=C2=A0 So= all we have to do to fix the discrepancy is weld and extra ring gears onto= to the flywheel ring gear and there will be teeth that the starter can rea= ch:(bottom of the page.. the cost $80)=0A>>>>http://mazdatrix.com/flywheel.= htm=0A>>>>It may also be possible to fix the discrepancy by changing the st= arter... will look into that.=0A>>>>=0A>>>>Damper Plate Placement - On the = flywheel, the mounting surface is proud (or aft) of the ring gear.=C2=A0 On= the flex plate, the mounting surface is recessed (or forward) from the rin= g gear. And it all pretty much works out.=C2=A0 That position on the flywhe= el will vary somewhat depending on which flywheel you have and how much wea= r you have on the clutch slip surface. But on my (I assume well-worn) flywh= eel the placement was 0.965 while the flex plate was 0.950.=C2=A0 Pretty da= mn close and given measurement error it might me meant to be right on.=C2= =A0 Or, any difference could be made up by trimming down the spline on the = damper plate or removing or adding spacers between the two.=0A>>>>=0A>>>>So= in my mind, a flywheel is the way to go.=C2=A0 Stout, easy to get, pick yo= ur weight, only mods seem to be drilling the mounting holes and welding on = a second gear ring.=0A>>>>=0A>>>>-- =0A>>>>David Leonard=0A>>>>=0A>>>>Turbo= Rotary RV-6 N4VY=0A>>>>http://N4VY.RotaryRoster.net=0A>>>>http://RotaryRos= ter.net=0A>>>=0A>>=0A>>=0A>>=0A>>=0A>>=0A>=0A>=0A> --0-1687541259-1310785444=:95361 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Mark,
 
    Y= ou just may have found a lightweight, relatively easy to implement, in= expensive fix !!................
 
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil = Manifold
"TURBONETICS"_TO4E50 Turbo

From:= Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lan= caironline.net>
Sent:= Friday, July 15, 2011 8:13 PM
Subj= ect: [FlyRotary] Re: Flex Plate Failure - Improvements

Kelly,

I don't see why not.  The diameter of ring gears is the same; &nb= sp;and the dimension from where the flex plate mates to the counterweight t= o the outer face of the ring gear is the same (1.250").  But I will ha= ve to fit-test it to be 100% certain.

Mark

On Fri, Jul 15, 2011 at 8:04 PM, Kell= y Troyer <keltro@att.net>= wrote:
Mark,
    Will your existing starter still ingage the r= ing gear properly??..........
 
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil = Manifold
"TURBONETICS"_TO4E50 Turbo

From: Mark Steitle <msteitle@gmail.com>

To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Friday, July 15, 2011 7:48 PM

Subje= ct: [FlyRotary] Re: Flex Plate Failure - Improvements
<= /DIV>

Guys,=20

I removed the flex plate from my 20B today and found a crack.  So= , as they say, "I now have skin in the game."  I was out in the garage= tonight, contemplating this problem and a possible solution came to me. &n= bsp;I'll run it by you guys here and see what you think.  =20

Comparing the 20B flex plate to a picture on the Mazdatrix web site, i= t appears that the 20B auto flex plate is identical to the Renesis auto fle= x plate.  The outer dimensions (ring gear) and offset from eccentric s= haft flange to outer edge of ring gear of the 20B flex plate is the same as= the 13B plate I removed from my 20B today.  The Renesis/20B plate has= a more gradual dish shape than the 13B, and is thicker too.  Since I = had a spare 20B flex plate and a spare 13B flex plate, I took a few quick m= easurements, and it looks like the 13B flex plate could be easily made to n= est down inside the 20B plate by removing the 13B's ring gear.  That w= ould allow for the two plates to be bolted together using the four 20B oute= r bolt holes along with the six crank bolts in the center (when installing = on engine).  Then the existing redrive adapter plate could be attached= using the original four existing bolts existing in the 13B plate.  This would leave the RD2-C aluminum adapter plate offset by the thic= kness of the 20B flex plate (.090"), and would result in a much stronger fl= ex plate.  I calculate this would increase the FWF weight by about 4 l= bs.    

Comments?  

Mark S. in TX


On Fri, Jul 15, 2011 at 6:32 PM, Kelly Troyer <keltro@att.net> wrote:
Dave , Tracy and All,
 
       Latest update is that proba= bly the substitution of a turbo starter should eliminate the apparent
need to add another starter ring gear on top of the "ACT" flywhe= el I have on order since this flywheel
is susposed to fit any 86-95 with Turbo flywheel (and start= er) and 04-08 RX8 with manual trans......
      Will keep all appraised of what I= find out when flywheel arrives..............
 
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil = Manifold
"TURBONETICS"_TO4E50 Turbo

From: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Friday, July 15, 2011 5:50 PMSubject: [FlyRotary] Re: = Flex Plate Failure - Improvements

Thanks for chiming in Tracy.  I have also thought about making an= intermediate plate for the RX8 flex plate, so far I am inclined to go with= a flywheel, but adapting the RX8 flex plate is gaining ground in my mind.<= /DIV>
 
As far as light weight steel fly wheels, mazdatrix sells one that weig= hs 18 lbs (including counter weight) and costs $350, and Kelly Tr= oyer found (and bought) one on the Internet that weighs 13.8 lbs = and is made of chome-molly-b and sells for $205.  Of course, looks lik= e either would require the addition of another ring gear weighing a couple = pounds and costing $80.  I'll wait to hear Kelly's report on the flywh= eel he bought.
 
--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.Rotary= Roster.net
http://RotaryRoster.net


On Fri, Jul 15, 2011 at 11:41 AM, Tracy <rwstracy@gmail.com> wrote:
I'm still in analysis mode on this myself.

So f= ar the possibilities are:

1. The flex plate may have been warped whe= n installed  ( I bought several that were)  I think the standard = should be close to zero runout or wobble on the flexplate in view of this f= ailure.

2.  The flexplate could have had cracks when installed&= nbsp; (I also bought several that had cracks and they were not visible unle= ss you looked closely)

3.  The dang things (RX-7 flexplates) ar= e not strong enough for boosted 13Bs or 20Bs. 

I do NOT think = the problem is fore & aft travel of the input shaft.  The RD-1x dr= ives have had thrust bearings from day one.  There is no thrust load a= t all on the damper, flexplate or crankshaft imposed by the drive. &nb= sp; This was not the case with the Ross drive I used at first.

I have over 1000 hours on the same flexplate on my NA 13B.&n= bsp; I have only 55 hours on the 20B.   But I'll be checking both= .  I did inspect both flexplates VERY carefully before installing.&nbs= p;

If I found that a change were necessary, I would consider two po= ssibilities.

1.  Use a modified aluminum racing flywheel used = with an auto counterweight.  (Or possibly a lightweight steel one if t= here is such a thing)

2.  Use an RX-8 flexplate with an adapter= plate made of aluminum or steel sheet to go between the flexplate and damp= er.  The RX-8 version looks stronger than the RX-7. I briefly studied = this when good RX-7 flexplates were getting hard to find.   I did not = develop a formal procedure for doing this but it looked like it would be pr= etty easy.  Anybody with spare time out there want to take a closer lo= ok?  Hint:   The damper bolt pattern would be offset 45 degrees from the RX-8 torque converter bolt pattern.
 
Tracy Crook,   RWS=20


On Fri, Jul 15, 2011 at 1:47 PM, Bobby J. Hughes <<= A href=3D"mailto:bhughes@qnsi.net" rel=3Dnofollow target=3D_blank ymailto= =3D"mailto:bhughes@qnsi.net">bhughes@qnsi.net> wrote:
Bill summed up what I=E2=80=99ve been t= hinking the last few days. I=E2=80=99m not changing anything until <= U>Tracy makes a recommendation. It could be fore and aft = movement on the shaft, flex plate out of round, worn rubber isolators or a = combination of all these items. We may need a scheduled maintenance plan to= replace items like the rubber isolators or other items that wear and loose= n tolerances.
 
 
 I will however be inspecting for = this problem before most flights.
 
Bobby Hughes
 (playing with fiberglass again)
From: Rot= ary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Friday, July 15, 2011 10:03 AM
To: Rotary motors in aircraft=
Subject: [FlyRotary= ] Re: Ok Here are the important flywheel measurements<= U>
 
David,
 
I can=E2=80=99t help but think that you= may be fixing something that is not broken.  I realize that the flexp= late came apart on your plane, but that doesn=E2=80=99t mean that the flexp= late is the cause of the problem.  That flexplate holds up quite well = in the car with a heavy torque converter attached to it.  Think of the= forces when a car under heavy acceleration changes gear! As long as the fo= rces are along the plane of the plate it is very strong.  Not so much = in the forward/rearward directions.  In fact that would cause metal fa= tigue and cause it to break just like yours did.  I think that what ev= er is causing the endplay is what you should be looking at.  I suspect= that if you check out the transmission on the car you will find that the e= ndplay of the input shaft is controlled by thrust bearings or some such dev= ice.  Lynn may know the answer to this??
 
That msg from Al Wick really resonates = with me.  Tracy had to install a thrust be= aring to prevent the drive shaft from hitting the bottom of the pilot beari= ng and causing an eccentric shaft failure on the engine.  Maybe you no= w need to add a cage similar to what Al was discussing that will trap the s= haft end play completely.  That, to me, makes more sense than adding a= bigger flywheel.  If you strengthen the weak spot, you will then disc= over where the next weakest spot is because that will be the next failure!&= nbsp;
 
This is a real opportunity for you and = the rest of us with the same drive.  Please study this a little more b= efore you begin the fix!
 
Bill B
 
From: Rot= ary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of David Leonard
Sent: Friday, July 15, 2011 12:42 AM
To: Rotary motors in aircraft<= /U>
Subject: [FlyRotary]= Ok Here are the important flywheel measurements
= Ring Gear Diameter - Perfect fit.  As we suspected, same si= ze, same tooth spacing.

Ring Ge= ar Fore-Aft Placement - As measured from the underside of the bi= g nut. (for all further reference, aft means aft in the CAR).  The fle= x plate puts the aft side of the ring gear 1.290 inches from the front of t= he big nut. The flywheel puts it 0.913.  So the flex plate puts the ring= gear (appx) 0.377 in. further aft.  This is actually fortuitous becau= se it just so happens that the ring gear thickness is .365 ...  &= nbsp; So all we have to do to fix the discrepancy is weld and extra ring ge= ars onto to the flywheel ring gear and there will be teeth that the starter= can reach:(bottom of the page.. the cost $80)
http://mazdatrix.com/fl= ywheel.htm
It may also be possible to fix the discrepancy by changin= g the starter... will look into that.

Damper Plate Placement - On the flywheel, the mounting su= rface is proud (or aft) of the ring gear.  On the flex plate, the moun= ting surface is recessed (or forward) from the ring gear. And it all pretty= much works out.  That position on the flywheel will vary somewhat depending on which flywheel you have and how much wear you have on the clu= tch slip surface. But on my (I assume well-worn) flywheel the placement was= 0.965 while the flex plate was 0.950.  Pretty damn close and given me= asurement error it might me meant to be right on.  Or, any difference = could be made up by trimming down the spline on the damper plate or removin= g or adding spacers between the two.

So in my mind, a flywheel is th= e way to go.  Stout, easy to get, pick your weight, only mods seem to = be drilling the mounting holes and welding on a second gear ring.

--
David Leonard

Turbo Rotary RV-6 N4VY
<= A href=3D"http://n4vy.rotaryroster.net/" rel=3Dnofollow target=3D_blank>htt= p://N4VY.RotaryRoster.net
http://RotaryRoster.net











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