X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2221592 for flyrotary@lancaironline.net; Tue, 31 Jul 2007 01:51:04 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.4; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m23.mx.aol.com (mail_out_v38_r9.2.) id q.c8f.14de0560 (14501) for ; Tue, 31 Jul 2007 01:50:23 -0400 (EDT) From: WRJJRS@aol.com Message-ID: Date: Tue, 31 Jul 2007 01:50:23 EDT Subject: Re: [FlyRotary] Re: Gear mesh area? Was [FlyRotary] Re: Gear redrives.com To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1185861023" X-Mailer: 9.0 SE for Windows sub 5042 X-Spam-Flag: NO -------------------------------1185861023 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en =20 In a message dated 7/29/2007 7:27:21 AM Pacific Standard Time, =20 ALVentures@cox.net writes: Let=E2=80=99s not mix up to two issues of spur gears vs helical; planetary=20= vs=20 non-planetary. Note that most of those big WWII engines used planetary, bu= t they=20 used spur gears Quite Right Al. Mistral's unit is a custom built spur gear planetary. Maybe=20= =20 a bit better than helical but much more expensive. Actually Helical allows =20 greater tooth contact than a spur gear, but does have the disadvantage of th= rust=20 from the gearset. The submarine guys wanted quiet high power sets and=20 started using herringbone or double mirrored teeth on a single gear, quiet=20= with no =20 thrusting. Bill Jepson ************************************** Get a sneak peek of the all-new AOL a= t=20 http://discover.aol.com/memed/aolcom30tour -------------------------------1185861023 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 7/29/2007 7:27:21 AM Pacific Standard Time,=20 ALVentures@cox.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DVerdana color=3D#0000ff siz= e=3D2>Let=E2=80=99s= not mix up to=20 two issues of spur gears vs helical; planetary vs non-planetary.  Not= e=20 that most of those big WWII engines used planetary, but they used spur=20 gears
Quite Right Al. Mistral's unit is a custom built spur gear planetary. M= aybe=20 a bit better than helical but much more expensive. Actually Helical allows=20 greater tooth contact than a spur gear, but does have the disadvantage of th= rust=20 from the gearset. The submarine guys wanted quiet high power sets and starte= d=20 using herringbone or double mirrored teeth on a single gear, quiet with no=20 thrusting.
Bill Jepson



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