X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail03.syd.optusnet.com.au ([211.29.132.184] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTPS id 1010653 for flyrotary@lancaironline.net; Wed, 22 Jun 2005 18:55:59 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.184; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-107-82.dsl.nsw.optusnet.com.au [211.31.107.82]) by mail03.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j5MMt89u026363 for ; Thu, 23 Jun 2005 08:55:10 +1000 Message-ID: <006c01c5777d$76bad420$526b1fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: PSRU adapter plate Date: Thu, 23 Jun 2005 08:55:18 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0069_01C577D1.47A800F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0069_01C577D1.47A800F0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Ernest, Don't do it ! George ( down under) Ernest I agree with Kelly on this. Quite aside from any structural = considerations, in looking at Tracy's exploded view of the RD assembly, = it appears that you would be moving the whole main gear housing assembly = 1/4 inch closer to the eccentric shaft and trying to force the input = shaft/sun gear 1/4 inch deeper into the planetary gears. From = examination of my uninstalled RD-1B, I believe that all shaft lengths, = bearings, thrust bearings, clearances,etc, are carefully based on use of = the 1/2 inch plate, and it would be impossible to use anything thinner. = Dean Van Winkle RV-9A Fuselage/Finish '89 13B NA, RD-1B, EC2, EM2 ----- Original Message -----=20 From: Kelly Troyer=20 To: Rotary motors in aircraft=20 Sent: Wednesday, June 22, 2005 1:08 PM Subject: [FlyRotary] Re: PSRU adapter plate Ernest, Without any engineering expertise I would not even consider = using 1/4" aluminum plate no matter what alloy !!FWIW -- Kelly Troyer=20 Dyke Delta/13B/RD1C/EC2=20 -------------- Original message from Ernest Christley = : --------------=20 > My bellhousing is to heavy. Dave McC is considering buying it = for his=20 > Europa, so I've been researching what it would take to replace = it. I=20 > think Tracy' s adapter plate is a very elegant solution for the=20 > homebuilder (ie, those of use without a foundry).=20 >=20 > His adapter plate uses 1/2" 6061. I've been considering at 7075=20 > aluminum. It has about twice the cost but also twice the yield=20 > strength. If I could use 1/4" plate instead of the 1/2", the = cost would=20 > be comparable, but I would have the very large benefit of saving = > something on the order of 4lbs in a very weight sensitive area. = I don't=20 > have the expertise to run the numbers with confidence. All I can = do is=20 > a static analysis following the directions outlined on PL's = website,=20 > just like I did for the engine mount.=20 >=20 > Any advise of stuff to look for that might no be so obvious and = not show=20 > up in a static analysis? (the three axis and torsional forces = are obvious)=20 ------=_NextPart_000_0069_01C577D1.47A800F0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Ernest,
Don't do it !
George ( down under)
Ernest
 
I agree with Kelly on this.  Quite aside from = any=20 structural considerations,  in looking at Tracy's exploded view = of the RD=20 assembly, it appears that you would be moving the whole main gear = housing=20 assembly 1/4 inch closer to the eccentric shaft and trying to=20 force the input shaft/sun gear 1/4 inch deeper into the planetary = gears.  From examination of my uninstalled RD-1B, I believe that = all=20 shaft lengths, bearings, thrust bearings, clearances,etc, are=20 carefully based on use of the 1/2 inch plate, and it would be = impossible=20 to use anything thinner. 
 
Dean Van Winkle
RV-9A  Fuselage/Finish   '89 13B=20 NA, RD-1B, EC2, EM2
----- Original Message -----
From:=20 Kelly = Troyer
To: Rotary motors in = aircraft=20
Sent: Wednesday, June 22, = 2005 1:08=20 PM
Subject: [FlyRotary] Re: PSRU = adapter=20 plate

Ernest,
    Without any engineering expertise I would = not even=20 consider using
1/4" aluminum plate no matter what alloy !!FWIW
--
Kelly Troyer
Dyke=20 Delta/13B/RD1C/EC2
--------------=20 Original message from Ernest Christley <echristley@nc.rr.com>: = --------------


> My bellhousing is to heavy. Dave = McC is=20 considering buying it for his
> Europa, so I've been = researching=20 what it would take to replace it. I
> think Tracy' s = adapter plate=20 is a very elegant solution for the
> homebuilder (ie, those = of use=20 without a foundry).
>
> His adapter plate uses 1/2" = 6061.=20 I've been considering at 7075
> aluminum. It has about = twice the=20 cost but also twice the yield
> strength. If I could use = 1/4" plate=20 instead of the 1/2", the cost would
> be comparable, but I = would=20 have the very large benefit of saving
> something on the = order of=20 4lbs in a very weight sensitive area. I don't
> have the = expertise=20 to run the numbers with confidence. All I can do is
> a = static=20 analysis following the directions outlined on PL's website, =
> just=20 like I did for the engine mount.
>
> Any advise of = stuff to=20 look for that might no be so obvious and not show
> up in a = static=20 analysis? (the three axis and torsional forces are obvious)=20
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