X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [216.8.74.9] (HELO mail.hansoninfosys.com) by logan.com (CommuniGate Pro SMTP 4.3.4) with SMTP id 1010421 for flyrotary@lancaironline.net; Wed, 22 Jun 2005 16:00:13 -0400 Received-SPF: none receiver=logan.com; client-ip=216.8.74.9; envelope-from=dvanwinkle@royell.net Received: (qmail 2236 invoked by uid 89); 22 Jun 2005 19:59:26 -0000 Received: from unknown (HELO dv) (216.8.89.122) by 0 with SMTP; 22 Jun 2005 19:59:26 -0000 Message-ID: <039901c57766$027dde20$800010ac@royell.net> From: "Dean" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: PSRU adapter plate Date: Wed, 22 Jun 2005 15:07:25 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0396_01C5773C.18F6D5A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Antivirus: avast! (VPS 0525-2, 06/22/2005), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0396_01C5773C.18F6D5A0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable 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=20 > 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_0396_01C5773C.18F6D5A0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
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=20 gears.  From examination of my uninstalled RD-1B, I believe that = all shaft=20 lengths, bearings, thrust bearings, clearances,etc, are = carefully based on=20 use of the 1/2 inch plate, and it would be impossible to use anything=20 thinner. 
 
Dean Van Winkle
RV-9A  Fuselage/Finish   '89 13B=20 NA, RD-1B, EC2, EM2
----- Original Message -----
From:=20 Kelly = Troyer
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>:=20 --------------


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