Return-Path: Received: from [216.52.245.18] (HELO ispwestemail2.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 362705 for flyrotary@lancaironline.net; Thu, 12 Aug 2004 15:21:04 -0400 Received-SPF: none receiver=logan.com; client-ip=216.52.245.18; envelope-from=Wschertz@ispwest.com Received: from ispwest.com (unverified [216.52.245.25]) by ispwestemail2.mdeinc.com (Vircom SMTPRS 3.1.302.0) with ESMTP id for ; Thu, 12 Aug 2004 12:20:31 -0700 Message-ID: X-EM-APIVersion: 2, 0, 1, 0 X-Priority: 3 (Normal) From: "Bill Schertz" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: C drive Date: Thu, 12 Aug 2004 12:20:31 -0700 MIME-Version: 1.0 Content-type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Left turning C drive -- basically cannot be done, unless a totally different= gear set were used (maybe not even then)=2E The reason 2=2E17 turns left an= d 2=2E85 turns right is making use of which set of gears drives the prop=2E = If you take the power off the ring gear, you get rotation reversal, if you t= ake it off the planetaries, you get same direction rotation, and a higher re= duction factor=2E By the way, this is how your automatic transmission works, (where the gears = come from), a band clamp holds the ring gear steady for forward, taking powe= r off the planets, and for reverse, they hold the planets stationary and tak= e the power off the ring gear=2E Then you go backwards=2E Bill Schertz KIS Cruiser # 4045 ----- Original Message ----- From: daveleonard@cox=2Enet [mailto:daveleonard@cox=2Enet] Sent: 8/11/2004 2:29:33 PM To: flyrotary@lancaironline=2Enet Subject: [FlyRotary] Re: C drive > Ed, does that mean it might not be too hard for Tracy to make drives that = turn either way? I refuese to re-do my cowl, vert=2E stab=2E and engine mou= nt to put on a right turning gear drive=2E But how hard would it be to make= a left turning C-drive? >=20 > Dave Leonard >=20 > >=20 > > Got my new conversion C drive from Tracy today=2E Looks great, will sta= rt working soon to put it and prop on the aircraft=2E > >=20 > > However, after close examination of the drive, I wish to state that it t= urns out the RING gear IS Fixed on the 2=2E85=2E The propeller shaft is dri= ven by the planetary gear housing (which now rotates) which is driven (of c= ourse ) by the SUN gear=2E This arrangement is the opposite of the 2=2E14 = where the ring gear rotates and drives the prop shaft and the planetary is f= ixed=2E The Sun gear drives the planetary in both cases=2E=20 > >=20 > > Someone took issue with my earlier speculation that this was the case wi= th the C drive and not being a gear box guy I declined to argue the point=2E= However, in this case, it turns out after rotating the prop shaft it was = clear what internal parts rotated and which did not=2E The ring gear does n= ot and=20the planetary does (on the C drive)=2E > >=20 > >=20 > >=20 > > Ed > > =20 > > Ed Anderson > > RV-6A N494BW Rotary Powered > > Matthews, NC > >=20 >=20 >=20 > >> Homepage: http://www=2Eflyrotary=2Ecom/ > >> Archive: http://lancaironline=2Enet/lists/flyrotary/List=2Ehtml