X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-wi0-f180.google.com ([209.85.212.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTPS id 5346426 for flyrotary@lancaironline.net; Wed, 11 Jan 2012 13:04:51 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.212.180; envelope-from=rwstracy@gmail.com Received: by wibhn14 with SMTP id hn14so581908wib.25 for ; Wed, 11 Jan 2012 10:04:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=icr1WnXMfsWPlnoVnUi/J1L7T//pNlXsmhMuqhp7JGk=; b=vpYtPvJsLWYHWFN3CwKXFECgF+cjNvXptzCwX1MWx+b8DBVi55VMEJKfItB6c6p+UM uh3pbjgdvwdFOZ6y05W8U5fRvlv3mK8oIWvZCZtmBf9FqH+/oOBpsAaRyZ+yp9wnnX8u Lq21+afmziJNDO6lcnOCFQyJaiyb474zATW84= MIME-Version: 1.0 Received: by 10.180.77.35 with SMTP id p3mr502890wiw.11.1326305056078; Wed, 11 Jan 2012 10:04:16 -0800 (PST) Received: by 10.216.12.207 with HTTP; Wed, 11 Jan 2012 10:04:15 -0800 (PST) In-Reply-To: References: Date: Wed, 11 Jan 2012 13:04:15 -0500 Message-ID: Subject: Re: [FlyRotary] Re: RD1B Failure From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=f46d043c0644bb39ea04b6447598 --f46d043c0644bb39ea04b6447598 Content-Type: text/plain; charset=ISO-8859-1 Hi David, Yikes!, very interested in the details, especially on the pin that fell out. Was that the oversized pin failure? Curious because I thought the only oversized pin I have retrofitted was on Mark Steitle's drive (but I could have forgotten one?) Anyway, if that is a failure mode possible with properly installed pins, I need to take corrective action. Tracy Crook On Tue, Jan 10, 2012 at 9:32 AM, David Leonard wrote: > Hi Ed, > Yes you have missed quite a saga and several failures. The underlying > cause of that one seems to be that the auto flex plate fatigued and broke, > leading to the pin failure (oversized pin). I replaced the flex plate with > a modified 4130 flywheel that seems much better suited to the purpose than > the flex-plate. > > I then had another failure of the RD-1B when the oiling system did not > seem up to the task during my qualifying run at Reno (clocked at 229 mph > while pulling 2Gs around the course). Of course, I was probably making > over 300 h.p. and pushing the RD-1B beyond its design limits. Not to > mention that my oil temps were not being measured well and have probably > always been higher than I thought. I am guessing oil temps were in excess > of 250F when the main plain bearing in the RD-1B seized (after landing). > > I have since had another failure. This time the sun gear pin seems to > have simply fallen out! Well, it fell out as much as it could until the > housing would not let it completely go, until the last little piece of the > pin sheared off. This was amazingly, again, discovered on the ground after > a long over-mountainous-terrain flight to Las Vegas. > > So despite 4 RD-1B failures in 3 different places all in 2011 (the pin > twice, the flex plate, and the main bearing - probably all related to > racing in Reno that year) I have not made any ground toward threatening > your rotary glider time record. :-) > > -- > David Leonard > > Turbo Rotary RV-6 N4VY > http://N4VY.RotaryRoster.net > http://RotaryRoster.net > > On Mon, Jul 11, 2011 at 6:57 AM, Ed Anderson wrote: > >> ** >> Hey, Dave >> >> Glad you didn't further challenge my Glider record {:>). >> >> I was thinking that perhaps the stress of the Reno Races might be a >> contributing factor to the gear box problem. Particularly if the shear pin >> was designed for a N/A 13B. Anyhow, hopefully, it is that simple a cause >> and you find no further damage. >> >> Send from Lake of The Ozarks resort - looking out over the waves and >> reclining in a lounge chair in the cool morning breeze >> >> Ed >> >> Edward L. Anderson >> Anderson Electronic Enterprises LLC >> 305 Reefton Road >> Weddington, NC 28104 >> http://www.andersonee.com >> http://www.eicommander.com >> >> *From:* David Leonard >> *Sent:* Sunday, July 10, 2011 11:58 PM >> *To:* Rotary motors in aircraft >> *Subject:* [FlyRotary] RD1B Failure >> >> Today had a failure of my RD-1B gear drive. It couldn't have happened at >> a better time, I was just taxiing off the runway at my home airport. I >> just finished flying 200 mi. to Santa Paula to help Paul with the getting >> of Mike Wills airplane back into the air. Flight home was otherwise >> unevenful and beautiful. I didn't bother taking it apart, but will do so >> tomorrow. Feels like I may have broken the sun gear pin again but will >> have to wait until tomorrow to be sure. The strange thing is that nothing >> particularly stressed it. >> >> Sorry there is not cause I can report... a little suspense until tomorrow. >> >> -- >> David Leonard >> >> Turbo Rotary RV-6 N4VY >> http://N4VY.RotaryRoster.net >> http://RotaryRoster.net >> > > > > > --f46d043c0644bb39ea04b6447598 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi David,
=A0=A0=A0=A0 Yikes!,=A0 very interested in the details, especi= ally on the pin that fell out.=A0=A0 Was that the oversized pin failure?=A0= Curious because I thought the only oversized pin I have retrofitted was on= Mark Steitle's drive (but I could have forgotten one?)=A0 Anyway, if t= hat is a failure mode possible with properly installed pins, I need to take= corrective action.

Tracy Crook

On Tue, Jan 10, 2012 at 9= :32 AM, David Leonard <wdleonard@gmail.com> wrote:
Hi Ed,
Yes you have missed quite a saga and several failures. =A0The un= derlying cause of that one seems to be that the auto flex plate fatigued an= d broke, leading to the pin failure (oversized pin). =A0I replaced the flex= plate with a modified 4130 flywheel that seems much better suited to the p= urpose than the flex-plate. =A0

I then had another failure of the RD-1B when the oiling= system did not seem up to the task during my qualifying run at Reno (clock= ed at 229 mph while pulling 2Gs around the course). =A0Of course, I was pro= bably making over 300 h.p. and pushing the RD-1B beyond its design limits. = =A0Not to mention that my oil temps were not being measured well and have p= robably always been higher than I thought. =A0I am guessing oil temps were = in excess of 250F when the main plain bearing in the RD-1B=A0seized (after = landing).

I have since had another failure. =A0This time the sun = gear pin seems to have simply fallen out! =A0Well, it fell out as much as i= t could until the housing would not let it=A0completely=A0go, until the las= t=A0little=A0piece of the pin sheared off. =A0This was amazingly, again, di= scovered on the ground after a long over-mountainous-terrain flight to Las = Vegas. =A0

So despite 4 RD-1B failures in 3 different places all i= n 2011 (the pin twice, the flex plate, and the main bearing - probably all = related to racing in Reno that year) I have not made any ground toward thre= atening your rotary glider time record. =A0:-)

--=A0
David Leonard

Turbo Rotary RV-6 N4VYhttp://N4VY.Rot= aryRoster.net
= http://RotaryRoster.net=A0

On Mon, Jul 11, 2011 at 6:57 AM, Ed Anderson <eanderson@carolina.= rr.com> wrote:
Hey, Dave
=A0
Glad you didn't further challenge my Glider r= ecord=20 {:>).=A0
=A0
=A0I was thinking that perhaps the stress of the = Reno=20 Races might be a contributing factor to the gear box problem.=A0 Particular= ly=20 if the shear pin was designed for a N/A 13B.=A0 Anyhow, hopefully, it is th= at=20 simple a cause and you find no further damage.
=A0
Send from Lake of The Ozarks resort - looking out= over the=20 waves and reclining in a lounge chair in the cool morning breeze
=A0
Ed
=A0
Edward L. Anderson
Anderson Electronic Enterpr= ises=20 LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com

Sent: Sunday, July 10, 2011 11:58 PM
To: Rotary motors in aircraft <= /div>
Subject: [FlyRotary] RD1B Failure

Today had a failure of my RD-1B gear drive.=A0 It couldn'= ;t=20 have happened at a better time, I was just taxiing off the runway at my hom= e=20 airport.=A0 I just finished flying 200 mi. to Santa Paula to help Paul with= =20 the getting of Mike Wills airplane back into the air.=A0 Flight home was=20 otherwise unevenful and beautiful.=A0 I didn't bother taking it apart, = but=20 will do so tomorrow.=A0 Feels like I may have broken the sun gear pin again= =20 but will have to wait until tomorrow to be sure.=A0 The strange thing is th= at=20 nothing particularly stressed it.

Sorry there is not cause I can=20 report... a little suspense until tomorrow.

--
David=20 Leonard

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





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