X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm17-vm0.access.bullet.mail.sp2.yahoo.com ([98.139.44.168] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with SMTP id 5053373 for flyrotary@lancaironline.net; Fri, 15 Jul 2011 21:05:14 -0400 Received-SPF: none receiver=logan.com; client-ip=98.139.44.168; envelope-from=keltro@att.net Received: from [98.139.44.103] by nm17.access.bullet.mail.sp2.yahoo.com with NNFMP; 16 Jul 2011 01:04:38 -0000 Received: from [98.139.44.78] by tm8.access.bullet.mail.sp2.yahoo.com with NNFMP; 16 Jul 2011 01:04:38 -0000 Received: from [127.0.0.1] by omp1015.access.mail.sp2.yahoo.com with NNFMP; 16 Jul 2011 01:04:38 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 739396.59458.bm@omp1015.access.mail.sp2.yahoo.com Received: (qmail 38486 invoked by uid 60001); 16 Jul 2011 01:04:38 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=att.net; s=s1024; t=1310778278; bh=cFyTtTDmn2+3S6IR8ctNMjVT0+S8+ZLZI5L/WPAJrlc=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=qPRA4h0Q58XXAXYb92on3Zya1TU6HP3tQQX3nIAQpeUm/EHiA+aZK7+sY9bWfTi0SQL541EWUyXQkvL1J8q/WAYSVTEMFDDH7+L8rM4OUs0KAnhKoIj4UxZMrCKSbD9l74pBO/J3mOkFAAnWoI1fDQ0mw/KfLItccO27RM3RsUk= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=att.net; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=rR6C7DdpCrs1Ndc1bALXzBDXk5cm86tH1ElnEOdK7r9JDm0xPzTGXJX2GdvW9muvqyo8E8rXquHlOPQZP13E4qz8QMuEvF0TYgrIkMhVaKmVbJsNRklTlq7Nqp/ybrbe2x4Y3W+m/fe73LpGst0/MTaDZv/fYkITFPOKFcLpIAo=; X-YMail-OSG: euLZ_dcVM1kcpGVMP_ks8EsomF5bLvv3aWLFcenftX9OpC7 7HVGc1VmiB.aOvRoGGQtvkdLet70P4eWRmaQKDAyd59tgBuyG2OxRjVAxFZ8 mlQRuRU6_4jXi_ZMt6tIKBIILzmke5O4qycYby1pc3KP1aikKx.MYtPnhRUV daT_ize.a0mVmaof0NW0gL8zZpHtNo7nk6WrNRfKYJoHO4jyeaN18wNcOO0R 2u.MnwpKALUTpmV_Q5RMXsQmgK_9cKhUOzV3O8sfWzVNdq6e0f2r34im18n2 JnG.hrKnWjJH.X5ep467rmomG5z3C.9YDBFvGfFu5Fil_xOUa4IQQRChClvw Lyt5YeoSi84Atc5z5gItI6gVgYqxG7JT7xz3mam.nyFJ.CF3ZlgZ9v9r063p K0EXJP6DOR4uJc5greMRFMJC3dRh0i8EZ8XslH.LxstUf_uIf00kOhOf7vXy _TQJtRt9ThDETCfhZXOoKpwHjh_KY Received: from [208.114.39.18] by web83907.mail.sp1.yahoo.com via HTTP; Fri, 15 Jul 2011 18:04:38 PDT X-Mailer: YahooMailWebService/0.8.112.307740 References: Message-ID: <1310778278.38473.YahooMailNeo@web83907.mail.sp1.yahoo.com> Date: Fri, 15 Jul 2011 18:04:38 -0700 (PDT) From: Kelly Troyer Reply-To: Kelly Troyer Subject: Re: [FlyRotary] Re: Flex Plate Failure - Improvements To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1697012305-1310778278=:38473" --0-1697012305-1310778278=:38473 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mark,=0A=C2=A0=C2=A0=C2=A0 Will your existing starter still ingage the ring= gear properly??..........=0A=0AKelly Troyer=0A"DYKE DELTA JD2" (Eventually= )=0A"13B ROTARY"_ Engine=0A"RWS"_RD1C/EC2/EM2=0A"MISTRAL"_Backplate/Oil Man= ifold=0A"TURBONETICS"_TO4E50 Turbo=0A=0AFrom: Mark Steitle =0ATo: Rotary motors in aircraft =0ASent: = Friday, July 15, 2011 7:48 PM=0ASubject: [FlyRotary] Re: Flex Plate Failure= - Improvements=0A=0A=0AGuys, =0A=0AI removed the flex plate from my 20B to= day 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 p= ossible solution came to me. =C2=A0I'll run it by you guys here and see wha= t you think. =C2=A0 =0A=0AComparing the 20B flex plate to a picture on the = Mazdatrix web site, it appears that the 20B auto flex plate is identical to= the Renesis auto flex plate. =C2=A0The outer dimensions (ring gear) and of= fset from eccentric shaft 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. =C2=A0The = Renesis/20B plate has a more gradual dish shape than the 13B, and is thicke= r 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 coul= d be easily made to nest down inside the 20B plate by removing the 13B's ri= ng gear. =C2=A0That would allow for the two plates to be bolted together us= ing the four 20B outer bolt holes along with the six crank bolts in the cen= ter (when installing on engine). =C2=A0Then the existing redrive adapter pl= ate could be attached using the original four existing bolts existing in th= e 13B plate. =C2=A0This would leave 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= =0AComments? =C2=A0=0A=0AMark S. in TX=0A=0A=0A=0AOn Fri, Jul 15, 2011 at 6= :32 PM, Kelly Troyer wrote:=0A=0ADave , Tracy and All,=0A>= =C2=A0=0A>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Latest update is that probab= ly the substitution of a turbo starter should eliminate the apparent=0A>nee= d to add another starter ring gear on top of the "ACT" flywheel I have on o= rder since this flywheel=0A>is susposed to fit any 86-95 with=C2=A0Turbo fl= ywheel (and starter)=C2=A0and 04-08 RX8 with=C2=A0manual trans......=0A>=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 Will keep all appraised of what I find out when= flywheel arrives..............=0A>=0A>Kelly Troyer=0A>"DYKE DELTA JD2" (Ev= entually)=0A>"13B ROTARY"_ Engine=0A>"RWS"_RD1C/EC2/EM2=0A>"MISTRAL"_Backpl= ate/Oil Manifold=0A>"TURBONETICS"_TO4E50 Turbo=0A>=0A>=0A>From: David Leona= rd =0A>To: Rotary motors in aircraft =0A>Sent: Friday, July 15, 2011 5:50 PM=0A>Subject: [FlyRotary]= Re: Flex Plate Failure - Improvements=0A>=0A>=0A>=0A>Thanks for chiming in= Tracy.=C2=A0 I have also thought about making an intermediate plate for th= e 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.=0A>=0A>As far as light wei= ght steel fly wheels, mazdatrix sells one that weighs=C2=A018 lbs (includin= g counter weight)=C2=A0and costs $350, and Kelly Troyer found=C2=A0(and bou= ght) one on the Internet that weighs=C2=A013.8 lbs and is made of chome-mol= ly-b and sells for $205.=C2=A0 Of course, looks like either would require t= he addition of another ring gear 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.RotaryRost= er.net=0A>http://RotaryRoster.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 fle= x plate may have been warped when installed=C2=A0 ( I bought several that w= ere)=C2=A0 I think the standard should be close to zero runout or wobble on= the flexplate in view of this failure.=0A>>=0A>>2.=C2=A0 The flexplate cou= ld have had cracks when installed=C2=A0 (I also bought several that had cra= cks and they 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 t= he input shaft.=C2=A0 The RD-1x drives have had thrust bearings from day on= e.=C2=A0 There is no thrust load at all on the damper, flexplate or cranksh= aft imposed by the drive.=C2=A0=C2=A0 This was not the case with the Ross d= rive 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 wou= ld consider two possibilities. =0A>>=0A>>1.=C2=A0 Use a modified aluminum r= acing flywheel used with an auto counterweight.=C2=A0 (Or possibly a lightw= eight steel one if there is such a thing)=0A>>=0A>>2.=C2=A0 Use an RX-8 fle= xplate with an adapter plate made of aluminum or steel sheet to go between = 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 hard to f= ind. =C2=A0 I did not develop a formal procedure for doing this but it look= ed like it would be pretty easy.=C2=A0 Anybody with spare time out there wa= nt 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, 20= 11 at 1:47 PM, Bobby J. Hughes wrote:=0A>>=0A>>Bill summ= ed up what I=E2=80=99ve been thinking the last few days. I=E2=80=99m not ch= anging anything until Tracy makes a recommendation. It could be fore and af= t 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 loo= sen tolerances.=0A>>>=C2=A0=0A>>>=C2=A0=0A>>>=C2=A0I will however be inspec= ting for this problem before most flights. =0A>>>=C2=A0=0A>>>Bobby Hughes= =0A>>>=C2=A0(playing with fiberglass again)=0A>>>From:Rotary motors in airc= raft [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 important 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 real= ize that the flexplate came apart on your plane, but that doesn=E2=80=99t m= ean that the flexplate is the cause of the problem.=C2=A0 That flexplate ho= lds up quite well in the car with a heavy torque converter attached to it.= =C2=A0 Think of the forces when a car under heavy acceleration changes gear= ! As long as the forces are along the plane of the plate it is very strong.= =C2=A0 Not so much in the forward/rearward directions.=C2=A0 In fact that w= ould cause metal fatigue and cause it to break just 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 transmission on the car you w= ill find that the endplay of the input shaft is controlled by thrust bearin= gs 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 shaft from hitting the botto= m 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 you strengthen the weak spot= , you will then discover where the next weakest spot is because that will b= e the next failure!=C2=A0 =0A>>>=C2=A0=0A>>>This is a real opportunity for = you and the rest of us with the same drive.=C2=A0 Please study this a littl= e more before you begin the fix!=0A>>>=C2=A0=0A>>>Bill B=0A>>>=C2=A0=0A>>>F= rom:Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behal= f Of David Leonard=0A>>>Sent: Friday, July 15, 2011 12:42 AM=0A>>>To: Rotar= y motors in aircraft=0A>>>Subject: [FlyRotary] Ok Here are the important fl= ywheel measurements=0A>>>=C2=A0=0A>>>I finally got to the hangar and measur= ed out my S5 turbo flywheel and the remains of my S5 flexplate.=C2=A0 The r= esults 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 pic= k up my daughter from daycare, so they are one try and slightly sloppy... I= make no guarantees.=C2=A0 The height measurements of the flex plate were p= articularly suspect because, well, mine 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 Gear Fore-Aft Placement - As measured from t= he underside of the big nut. (for all further reference, aft means aft in t= he CAR).=C2=A0 The flex plate puts the aft side of the ring gear 1.290 inch= es from the front of the big nut. The flywheel puts it 0.913.=C2=A0 So the = flex plate puts the ring gear (appx) 0.377 in. further aft.=C2=A0 This is a= ctually fortuitous because it just 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 i= s weld and extra ring gears onto to the flywheel ring gear and there will b= e teeth that the starter can reach:(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 starter... will look into that.=0A>>>=0A>>>Damp= er 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 recess= ed (or forward) from the ring gear. And it all pretty much works out.=C2=A0= That position on the flywheel will vary somewhat depending on which flywhe= el you have and how much wear you have on the clutch slip surface. But on m= y (I assume well-worn) flywheel the placement was 0.965 while the flex plat= e was 0.950.=C2=A0 Pretty damn close and given measurement error it might m= e meant to be right on.=C2=A0 Or, any difference could be made up by trimmi= ng down the spline on the damper plate or removing or adding spacers betwee= n the two.=0A>>>=0A>>>So in my mind, a flywheel is the way to go.=C2=A0 Sto= ut, easy to get, pick your weight, only mods seem to be drilling the mounti= ng holes and welding on a second gear ring.=0A>>>=0A>>>-- =0A>>>David Leona= rd=0A>>>=0A>>>Turbo Rotary RV-6 N4VY=0A>>>http://N4VY.RotaryRoster.net=0A>>= >http://RotaryRoster.net=0A>>=0A>=0A>=0A>=0A>=0A> --0-1697012305-1310778278=:38473 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Mark,
    W= ill your existing starter still ingage the ring 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@lan= caironline.net>
Sent:= Friday, July 15, 2011 7:48 PM
Subj= ect: [FlyRotary] Re: Flex Plate Failure - Improvements

Guys,

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.  

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, Kell= y 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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