X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from vms040pub.verizon.net ([206.46.252.40] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 916116 for flyrotary@lancaironline.net; Fri, 06 Jan 2006 20:53:17 -0500 Received: from [63.24.59.101] ([63.24.42.79]) by vms040.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0ISP004BT98FO1J2@vms040.mailsrvcs.net> for flyrotary@lancaironline.net; Fri, 06 Jan 2006 19:53:08 -0600 (CST) Date: Fri, 06 Jan 2006 16:58:51 -0800 From: Ken Welter Subject: Re: [FlyRotary] [FlyRotary]Soapbox Warning! PSRU Ratios In-reply-to: To: "Rotary motors in aircraft" Message-id: MIME-version: 1.0 Content-type: multipart/alternative; boundary="============_-1075523671==_ma============" References: --============_-1075523671==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" It was the 3.17 four planet aluminum, the planet bearing went out first and then the aluminum carrier broke up and ground up into shavings that went into the oil and plugged up the oil intake for the engine causing a rotor seizure, I was at 6,000 ft with the tops at 5,000 and a ceiling of 500 below at the time, luckily I was following rivers with the GPS so no big deal making an instrument into the river. Yes a six planet would spread the load over more gears but the planets are so cheep like about 70 bucks for both the C-6 and the Dodge I would replace them like every 100 hrs or so to be safe, I had about 400 hrs on the Ross when it let go. Ken >Ken, > What planetary ratio was your "ROSS" redrive that lost the planet >bearings ?? As >I recall the ROSS has a rather primative lube system that led to >primature failures >to more than one of them........Plus your installation probably put >the supreme test >to these redrives (nitrus)........I would guess that Tracy's steel >housing , 6 planet >drives with pressure lube (as in the transmission) would stand up >much better..... > > IMHO >-- >Kelly Troyer >Dyke Delta/13B/RD1C/EC2 > > > >-------------- Original message from Ken Welter >: -------------- > > I will have a pilot shaft that will have a flange on it that the >spline will bolt to and the pilot shaft will go through the seal and >to the damper. > As for the the 4.4 inch ring gear the C-6 units that give the 2.17 >ratio are 4.4 inch diameter but the ring gear is not the problem >with the C-6 its the sun gear that likes to chip, also a problem is >the planet bearings are a problem any time they are used where the >planet is spinning like the 2.85 or 3.17 rather than being held >solid to to case like the 2.17 ratio, this is also a concern with >the 3.21 Dodge as the planet is going to be spinning and solution to >just trash can the planet set every couple hundred hrs as they are >so cheep and in fact I will probably replace the sun gear also, hell >the whole gear set only cost 150 bucks so that's cheap insurance as >that costs a hell of a lot less than a tank of gas in my plane. > By the way the thing that finally killed my Ross gearbox was the >planet bearings went out. > All and all the C-6 seams to be fine for the little rotary but >they have a vary bad track record Compared to the GM or Dodge in the >big rig trucks. > Ken Welter > > > > >> --============_-1075523671==_ma============ Content-Type: text/html; charset="us-ascii" Re: [FlyRotary] [FlyRotary]Soapbox Warning! PSRU Ratios

  It was the 3.17 four planet aluminum, the planet bearing went out first and then the aluminum carrier broke up and ground up into shavings that went into the oil and plugged up the oil intake for the engine causing a rotor seizure, I was at 6,000 ft with the tops at 5,000 and a ceiling of 500 below at the time, luckily I was following rivers with the GPS so no big deal making an instrument into the river.
  Yes a six planet would spread the load over more gears but the planets are so cheep like about 70 bucks for both the C-6 and the Dodge I would replace them like every 100 hrs or so to be safe, I had about 400 hrs on the Ross when it let go.
  Ken




Ken,
  What planetary ratio was your "ROSS" redrive that lost the planet bearings ?? As
I recall the ROSS has a rather primative lube system that led to primature failures
to more than one of them........Plus your installation probably put the supreme test
to these redrives (nitrus)........I would guess that Tracy's  steel housing , 6 planet
drives with pressure lube (as in the transmission) would stand up much better.....
 
 IMHO
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2


-------------- Original message from Ken Welter <rotary.coot@verizon.net>: --------------
   I will have a pilot shaft that will have a flange on it that the spline will bolt to and the pilot shaft will go through the seal and to the damper.
  As for the the 4.4 inch ring gear the C-6 units that give the 2.17 ratio are 4.4 inch diameter but the ring gear is not the problem with the C-6 its the sun gear that likes to chip, also a problem is the planet bearings are a problem any time they are used where the planet is spinning like the 2.85 or 3.17 rather than being held solid to to case like the 2.17 ratio, this is also a concern with the 3.21 Dodge as the planet is going to be spinning and solution to just trash can the planet set every couple hundred hrs as they are so cheep and in fact I will probably replace the sun gear also, hell the whole gear set only cost 150 bucks so that's cheap insurance as that costs a hell of a lot less than a tank of gas in my plane.
  By the way the thing that finally killed my Ross gearbox was the planet bearings went out.
  All and all the C-6 seams to be fine for the little rotary but they have a vary bad track record Compared to the GM or Dodge in the big rig trucks.
  Ken Welter




 

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