X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.4.51.74] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1002485 for flyrotary@lancaironline.net; Wed, 15 Jun 2005 00:02:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.51.74; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 14 Jun 2005 21:01:29 -0700 Message-ID: Received: from 64.4.51.220 by BAY107-DAV2.phx.gbl with DAV; Wed, 15 Jun 2005 04:01:29 +0000 X-Originating-IP: [64.4.51.220] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] planetary gear ratios Date: Wed, 15 Jun 2005 00:01:22 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009B_01C5713D.5D6E2350" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Wed, 15 Jun 2005 00:01:22 -0400 X-OriginalArrivalTime: 15 Jun 2005 04:01:29.0951 (UTC) FILETIME=[E8FA4EF0:01C5715E] This is a multi-part message in MIME format. ------=_NextPart_000_009B_01C5713D.5D6E2350 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The formula is not the same for both locked ring gear and locked = planetary gear. This formula is for the locked ring gear and you = probably have the locked planetary. Remove the 1 from the equation and = it will come out right for yours. =20 Tracy (making a lot of assumptions about your drive) ----- Original Message -----=20 From: Ernest Christley=20 To: Rotary motors in aircraft=20 Sent: Tuesday, June 14, 2005 11:24 PM Subject: [FlyRotary] planetary gear ratios I ran across some information in one of the scientific newsgroups on = how=20 to calculate the gear ratio of a planetary gear set. ratio =3D 1 + r / s where: r =3D number of ring gear teeth s =3D number of sun gear teeth. I haven't replace my 3-pinion gear set with a 6-pinion set, because = I've=20 not been able to positively identify it to where I could call out a = part=20 number. Order strange gearset from the internet is not what I = consider=20 an efficient way to spend money. So I went out and counted. 74 teeth = on the ring and 34 on the sun. 1+74/34 =3D 3.176 That is not the 2.17 OR the 2.85 from the Ford gear sets. Is it=20 possible that the one isn't added in standard practice, so that what I = actually have is the 2.17 gear set? --=20 This is by far the hardest lesson about freedom. It goes against instinct, and morality, to just sit back and watch people make mistakes. We want to help them, which means control them and their decisions, but in doing so we actually hurt them (and ourselves)." >> Homepage: http://www.flyrotary.com/ >> Archive: = http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_009B_01C5713D.5D6E2350 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

The formula is not the same for both locked ring gear and locked = planetary=20 gear. This formula is for the locked ring gear and you = probably have=20 the locked planetary. Remove the 1 from the equation and it will = come out=20 right for yours.

Tracy (making a lot of assumptions about your drive)

----- Original Message -----

From: Ernest=20 Christley

To: Rotary motors in = aircraft

Sent: Tuesday, June 14, 2005 = 11:24=20 PM

Subject: [FlyRotary] planetary = gear=20 ratios

I ran across some information in one of the scientific=20 newsgroups on how
to calculate the gear ratio of a planetary gear=20 set.

ratio =3D 1 + r / s

where: r =3D number of ring = gear=20 teeth
= s =3D=20 number of sun gear teeth.

I haven't replace my 3-pinion gear = set with a=20 6-pinion set, because I've
not been able to positively identify it = to=20 where I could call out a part
number. Order strange gearset = from the=20 internet is not what I consider
an efficient way to spend = money. So=20 I went out and counted. 74 teeth
on the ring and 34 on the=20 sun.

1+74/34 =3D 3.176

That is not the 2.17 OR the 2.85 = from the=20 Ford gear sets. Is it
possible that the one isn't added in = standard=20 practice, so that what I
actually have is the 2.17 gear = set?

--=20
This is by far the hardest lesson about freedom. It goes=20 against
instinct, and morality, to just sit back and watch people=20 make
mistakes. We want to help them, which means control them and=20 their
decisions, but in doing so we actually hurt them (and=20 ourselves)."

>> Homepage: http://www.flyrotary.com/
>&= gt; =20 Archive: http://lancai= ronline.net/lists/flyrotary/List.html

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