X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2210612 for flyrotary@lancaironline.net; Sat, 28 Jul 2007 21:26:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id l6T1Q3wT027700 for ; Sat, 28 Jul 2007 21:26:03 -0400 (EDT) Message-ID: <000f01c7d17f$82149ff0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Gear mesh area? Was [FlyRotary] Re: Gear redrives.com Date: Sat, 28 Jul 2007 21:26:37 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C7D15D.FAB6B4B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C7D15D.FAB6B4B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks, Tracy Suspicions confirmed! It just seem a more sophisticated method of = transferring power from shaft to shaft than a Spur gear. But, as you = mentioned, as long as it is designed to me the loads, conditions and = environment, any number of methods of power transfer work, belts, gears, = hydraulic, turbine wheels, etc. However, for simplicity, weight and = cost, its hard to beat a planetary gear set. Just my opinion of course. Ed ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Saturday, July 28, 2007 6:57 PM Subject: [FlyRotary] Re: Gear mesh area? Was [FlyRotary] Re: Gear = redrives.com Hi Ed, My quick & dirty answer is that the 6 pinion planet set is equivalent = to a spur gear drive with a gear width totaling the width of all 6 = planets. That would be: 6 * .785" =3D 4.71" Thats a mighty big & heavy spur gear! =20 That's bigger than the one in a P-51 R.R. Merlin engine I think. Not = an apples to apples comparison due to the difference in bending strength = of the tooth root but the biggie factor in power handling capability is = indeed the gear contact patch.=20 Tracy =20 On 7/28/07, Ed Anderson wrote:=20 Well, Tracy, its sort of like flying 400 hours with a "Plugs Up" = installation - can't possibly work - the "experts" have said so {:>). It continues to amaze me (as it does you) how people can just = accept something sprouted out by some little (or unknown) self-styled = expert without attempt to ascertain whether there are any independent = sources/ facts supporting that position. =20 As several individuals have pointed out most high powered (1500+) = engines of WWII had planetary gear boxes not to mention the dozens of = different turboprop engines. But, I guess all of that evidence does = not out-weigh the opinions of "experts". =20 I have not done this but it would be interesting to calculate the = teeth mesh area of one of the spur gear PSRU and then compare it to the = area of the six pinion sun and planetary gear area engaged to transfer a = similar amount of power. I could be wrong, but my gut feel is that the = sun and planetary probably have more metal to metal contact area for = transferring power than the Sun gear. =20 But, like I said - just a hunch, would be interesting to know. = Anybody have a quick answer?? Ed ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Saturday, July 28, 2007 1:47 PM Subject: [FlyRotary] Re: Gear redrives.com =20 Thought I'd see what else I was doing wrong so took a fresh look = at the geareddrives.com website. The kiss of death for a set of gears is in not using the proper = lubrication. Separate lubrication systems are required for safety and = for proper engine and gear function. Sharing engine oil with the PSRU is = asking for engine and/or PSRU failure in advance.=20 There is absolutely nothing I'm doing right! But the company does not look like it is for sale though. But = Gershwinder (Sp?) drive company is for sale now. Their chain drives = were among the best I've seen.=20 Tracy ------=_NextPart_000_000C_01C7D15D.FAB6B4B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks, Tracy
 
Suspicions confirmed!  It just seem a more=20 sophisticated method of transferring power from shaft to shaft than a = Spur=20 gear.  But, as you mentioned, as long as it is designed to me the = loads,=20 conditions and environment, any number of methods of power transfer = work, belts,=20 gears, hydraulic, turbine wheels, etc.  However, for simplicity, = weight and=20 cost, its hard to beat a planetary gear set. Just my opinion of=20 course.
 
Ed
----- Original Message -----
From:=20 Tracy=20 Crook
Sent: Saturday, July 28, 2007 = 6:57=20 PM
Subject: [FlyRotary] Re: Gear = mesh area?=20 Was [FlyRotary] Re: Gear redrives.com

Hi Ed,
My quick & dirty answer is that the 6 pinion planet set is = equivalent=20 to a spur gear drive with a gear width totaling the width of all 6=20 planets.  That would be:
 
6 * .785" =3D 4.71"    Thats a mighty big & = heavy spur=20 gear!  
 
That's bigger than the one in a P-51 R.R. Merlin engine I = think. =20 Not an apples to apples comparison due to the difference = in bending=20 strength of the tooth root but the biggie factor in power handling = capability=20 is indeed the gear contact patch.
 
Tracy

 
On 7/28/07, Ed=20 Anderson <eanderson@carolina.rr.com&g= t;=20 wrote:=20
 Well, Tracy, its sort of like flying = 400 hours=20 with a "Plugs Up" installation - can't possibly work - the "experts" = have=20 said so {:>).
 
  It continues to amaze me (as it does = you) how=20 people can just accept something sprouted out by some little (or = unknown)=20  self-styled expert without attempt to ascertain whether = there are=20  any independent sources/ facts supporting that = position. =20
 
As several individuals have pointed out most = high=20 powered (1500+) engines of WWII had planetary gear boxes not to = mention the=20 dozens of different  turboprop engines.  But, I guess all = of that=20 evidence does not out-weigh the opinions of "experts".  =
 
I have not done this but it would = be interesting=20 to calculate the teeth mesh area of one of the spur gear PSRU and = then=20 compare it to the area of the six pinion sun and planetary gear=20 area engaged to transfer a similar amount of power.  = I could=20 be wrong, but my gut feel is that the sun and planetary probably = have more=20 metal to metal contact area for transferring power than the Sun = gear. =20
 
 But, like I said - just a hunch, would = be=20 interesting to know.  Anybody have a quick = answer??
 
 
 
Ed
 
 
----- Original Message ----- =
From: = Tracy = Crook=20
To: Rotary = motors in=20 aircraft
Sent: Saturday, July 28, = 2007 1:47=20 PM
Subject: [FlyRotary] Re: = Gear redrives.com

 
Thought I'd see what else I was doing wrong so took a fresh = look at=20 the geareddrives.com=20 website.
 
The kiss of death for a set of gears is = in not=20 using the proper lubrication. Separate lubrication systems = are=20 required for safety and for proper engine and gear function. = Sharing=20 engine oil with the PSRU is asking for engine and/or PSRU failure = in=20 advance.
There is absolutely nothing I'm doing=20 right!
 
But the company does not look like it is for sale = though.  But=20 Gershwinder (Sp?) drive company is for sale now.  Their chain = drives=20 were among the best I've seen. 
 
=
Tracy

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