Return-Path: Received: from mtiwmhc11.worldnet.att.net ([204.127.131.115] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 726520 for flyrotary@lancaironline.net; Sat, 12 Feb 2005 15:26:59 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.131.115; envelope-from=keltro@att.net Received: from 204.127.135.29 ([204.127.135.29]) by worldnet.att.net (mtiwmhc11) with SMTP id <20050212202613111009oj22e>; Sat, 12 Feb 2005 20:26:13 +0000 Received: from [209.247.222.95] by 204.127.135.29; Sat, 12 Feb 2005 20:26:13 +0000 From: keltro@att.net (Kelly Troyer) To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: PSRU - hub/prop end Date: Sat, 12 Feb 2005 20:26:13 +0000 Message-Id: <021220052026.19670.420E6664000F079400004CD62160375964019D9B040A05@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 18 2004) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_19670_1108239973_0" --NextPart_Webmail_9m3u9jl4l_19670_1108239973_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Ernest, Why not go ahead and spring for the 6 planet gearset that most are buying with Tracy's drive ?? -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 -------------- Original message from Ernest Christley : -------------- > George Lendich wrote: > > > Tracy, > > I guess that was directed at me, and that's a Yes! > > I had requested that info from the Chief Engineer at Timken Australia, > > who provide those figures. If memory serves me I quoted 3,000 RPM. > > > > Butch suggested that 250,000 hrs was way overkill ! > > That's not to say they are the best bearing for the job, but they are > > a very robust bearing - that's for sure. > > > > The big problem for any bearing is cooling, so a TRB with much larger > > surface area than ( for instance) a plain ball bearing, requires more > > cooling. > > > > I had originally wanted to use TRB on my own Aussie design, as an > > engineer mate explained - their so robust, but have been since coerced > > by Butch to consider other options. > > George ( down under) > > > I'd like to share as much of the details of this design with y'all as I > can. The more I look at it, the more I realize how ingenious and how > much overkill it is. I think it would probably drive a B-52 to an > aerobatic championship. It's heavy at around 45lbs, but a lot of that > weight was for cosmetic purposes. Joe was trying to emulate the center > section of a radial, AND need to add weight to the nose for CG purposes, > so the housing is about 2" thick at the rear. The wheel axle 'thingy' > (feel free to correct my terminology) is welded directly to the gearset > housing, and carries ALL of the flight loads. The prop shaft does > nothing but actually turn the propeller (not that that is a small job). > The hollow shaft that the hub rides on is 1.98" in diameter and has a > .2010" thick wall. > > The ball bearing at the rear can probably handle the reaction thrust, > but I'm going to add a plain bearing anyway. I have to supply oil to > the center of the sun gear, and the easiest way for me to do that is to > pump it forward through the sun gear shaft (vs backward through the prop > shaft as Tracy does). I'll only have to drill about 1" through a > hardened shaft, vs the 10" to do it the other way. I'll drill an oil > gallery in the plain bearing, and make it just large enough to backup > the inner race of the ball bearing. > > I'll feed oil at the rear in this method, and then I'll block off the > oil gallery at the other end so that it's supply will only feed > forward. It will be forced to travel down the inside of the hub and > return back between the propeller drive shaft and it's housing to a > single return at a low point in the planet gear housing. The front > bearings will ride in an oil bath about 1/3 of it's diameter; oil that > has just come through the cooler. This, combined with the hub spinning > out in the 200mph wind, should keep it cool. > > The only part that worries me is that it uses a 3-planet gearset. I > believe I can swap in a 4-planet set without further modification, but > that is still under investigation. > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_19670_1108239973_0 Content-Type: text/html Content-Transfer-Encoding: 8bit
Ernest,
   Why not go ahead and spring for the 6 planet  gearset that
most are buying with Tracy's drive ??
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2




-------------- Original message from Ernest Christley <echristl@cisco.com>: --------------


> George Lendich wrote:
>
> > Tracy,
> > I guess that was directed at me, and that's a Yes!
> > I had requested that info from the Chief Engineer at Timken Australia,
> > who provide those figures. If memory serves me I quoted 3,000 RPM.
> >
> > Butch suggested that 250,000 hrs was way overkill !
> > That's not to say they are the best bearing for the job, but they are
> > a very robust bearing - that's for sure.
> >
> > The big problem for any bearing is cooling, so a TRB with much larger
> > surface area than ( for instance) a plain ball bearing, requires more
> > cooling.
> >
> > I had originally wanted to use TRB on my own Aussie design, as an
> > engineer mate explained - their so robust, but have been since coerced
> > by Butch to consider other options.
> > George ( down under)
> >
> I'd like to share as much of the details of this design with y'all as I
> can. The more I look at it, the more I realize how ingenious and how
> much overkill it is. I think it would probably drive a B-52 to an
> aerobatic championship. It's heavy at around 45lbs, but a lot of that
> weight was for cosmetic purposes. Joe was trying to emulate the center
> section of a radial, AND need to add weight to the nose for CG purposes,
> so the housing is about 2" thick at the rear. The wheel axle 'thingy'
> (feel free to correct my terminology) is welded directly to the gearset
> housing, and carries ALL of the flight loads. The prop shaft does
> nothing but actually turn the propeller (not that that is a small job).
> The hollow shaft that the hub rides on is 1.98" in diameter and has a
> .2010" thick wall.
>
> The ball bearing at the rear can probably handle the reaction thrust,
> but I'm going to add a plain bearing anyway. I have to supply oil to
> the center of the sun gear, and the easiest way for me to do that is to
> pump it forward through the sun gear shaft (vs backward through the prop
> shaft as Tracy does). I'll only have to drill about 1" through a
> hardened shaft, vs the 10" to do it the other way. I'll drill an oil
> gallery in the plain bearing, and make it just large enough to backup
> the inner race of the ball bearing.
>
> I'll feed oil at the rear in this method, and then I'll block off the
> oil gallery at the other end so that it's supply will only feed
> forward. It will be forced to travel down the inside of the hub and
> return back between the propeller drive shaft and it's housing to a
> single return at a low point in the planet gear housing. The front
> bearings will ride in an oil bath about 1/3 of it's diameter; oil that
> has just come through the cooler. This, combined with the hub spinning
> out in the 200mph wind, should keep it cool.
>
> The only part that worries me is that it uses a 3-planet gearset. I
> believe I can swap in a 4-planet set without further modification, but
> that is still under investigation.
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
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