X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f219.google.com ([209.85.218.219] verified) by logan.com (CommuniGate Pro SMTP 5.3.4) with ESMTP id 4173889 for flyrotary@lancaironline.net; Sun, 21 Mar 2010 19:19:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.219; envelope-from=msteitle@gmail.com Received: by bwz19 with SMTP id 19so4755859bwz.6 for ; Sun, 21 Mar 2010 16:18:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=Oc1bKddiiXFMHMg3NLz/2bmXs7wBUMVpD6Pbb0LxcJI=; b=Lg2oSunQxRdz2m2T8xZ0mUUAkfVy2EjAHAHFhBvZfrkE+UtcYvkK4qR1dEUV7GW+lP IqN2FMqiHo/p9ffOjBZ2mQYq4hCg0FHh3napQsHHFsjWOpwJLFvXxrmqYN9Xl171O5mp PXvwCv1KDXXHxnto8QQ9NrxIyifJhOaZEmaIc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=LNOz4UfN8JYmaFWPSZ4M9dxU2bso1ayKK8mj0Ycbn/6qWA5XIdn0XqMbLqg+YvF7Gx 7J0YB0UI6PS0UAYdveDWp5jZLvLXDykY31Eo2tuloiuyz1A/e2d7e1AK48vd/SSxB5Ri yMFcfa0JdbGXCYKVWctyd43DJO5HfPghdwIdQ= MIME-Version: 1.0 Received: by 10.204.130.90 with SMTP id r26mr1929160bks.9.1269213526076; Sun, 21 Mar 2010 16:18:46 -0700 (PDT) In-Reply-To: References: Date: Sun, 21 Mar 2010 18:18:45 -0500 Message-ID: <5cf132c1003211618r45a85172nc735c6d6d97efcf7@mail.gmail.com> Subject: Re: [FlyRotary] Re: Fwd: Question on RD2-C From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=001517447eb65dacd6048257cd36 --001517447eb65dacd6048257cd36 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Al, It takes 20 bolts. Mark S. On Sun, Mar 21, 2010 at 1:13 PM, Al Gietzen wrote: > Bolts were AN3-6A, but not of the close tolerance variety... not a bad > idea though. Does Van's sell those? > > Mark S. > > Mark; > > I forget to ask you - how many? > > Aircraft Spruce has the close tolerance bolts. AN173 =96AN175; would be -= 6. > 1/32 shorter than AN3-6. Undrilled. > > http://www.aircraftspruce.com/catalog/hapages/closetolbolts.php > > Al > > > > I checked the rivets on my RD2-C damper assembly and was able to confirm > that they were in fact beginning to loosen as evidenced by the radial > streaks on the damper plate. I picked four rivets at random, approx. 90 > degrees apart, and grabbed the shop heads with vice grips and tried to sp= in > them. All four would spin with little effort, thus confirming that they > were beginning to loosen. After a phone call to Tracy, we decided to > replace the ring of rivets with AN3 bolts, which I've now done. > > One advantage to rivets is that they fill the holes to zero tolerance. T= he > bolts will be MUCH stronger, but I=92m wondering about the potential for = some > very small amount of =91play=92 to begin with, which would not be a good = thing. > I don=92t know much about steel rivets, but maybe that=92s the way to go. > > > > Mark; what nominal length and grip length on the bolts? Are you using > standard AN bolts or are there =91true=92 diameter or =91close tolerance= =92 bolts > available. > > > > Al > > > > Hum-m-m; I just decided I could change schedules in order to fly to the > Jean, NV gathering next week. Now I=92m wondering whether to fly anywhere > before changing out the rivets. I=92m thinking that since I see no moveme= nt > between flange and plate after 180 hours, it should be good for at least = a > few more hours. > > > > > --001517447eb65dacd6048257cd36 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Al,=A0

It takes 20 bolts. =A0

M= ark S.


On Sun, Mar 21, 2010 at= 1:13 PM, Al Gietzen <ALVentures@cox.net> wrote:

Bolts were AN3-6A, but no= t of the close tolerance variety... not a bad idea though. =A0Does Van's sell those? =A0<= /font>

Mark S.

Mark;

I forget to ask you - how many?

Aircraft Spruce has the close tolerance bolts. AN173 =96AN175; would be -6.=A0 1/32 shorter than AN3-6. Undrilled.

http://www.aircraftspruce.com/catalog/h= apages/closetolbolts.php

Al

=A0

I checked the rivets on = my RD2-C damper assembly and was able to confirm that they were in fact beginning to loosen as evidenced= by the radial streaks on the damper plate. =A0I picked four rivets at random, approx. 90 degrees apart, and grabbed the shop heads with vice grips and tr= ied to spin them. =A0All four would spin with little effort, thus confirming that they were beginning to loosen. =A0After a phone call to = Tracy, we decided to replace the ring of rivets with AN3 bolts, which I've now= done.

One advantage to rivets is that they fill the holes to zero tolerance. =A0The bolts will be MUCH stronger, but I=92m wondering about the potential for some very small amount of =91play=92 to begin with, which would not be a good thing.=A0 I don=92t know much about steel rivets, but maybe that=92s the way to go. =A0

=A0

Mark; what nominal length and grip length on the bolts? Are you using standard AN bolts or are there =91true=92 diameter or =91close tolerance=92 bolts available.

=A0

Al

=A0

Hum-m-m; I just decided I could change schedules in order to fly to the Jean, NV gathering next week. Now I=92m wondering whether to fly anywhere before changing out the rivets. I=92m thinking that since I see no movement between flange and plate after 180 hours, it should be good for at least a = few more hours.

=A0

=A0


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