Return-Path: Received: from sccrmhc12.comcast.net ([204.127.202.56] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 830259 for flyrotary@lancaironline.net; Wed, 30 Mar 2005 13:54:37 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.202.56; envelope-from=jesse@jessfarr.com Received: from office5 (pcp04959909pcs.midval01.tn.comcast.net[68.59.199.44]) by comcast.net (sccrmhc12) with SMTP id <2005033018535101200pi3ece>; Wed, 30 Mar 2005 18:53:51 +0000 Message-ID: <043a01c53559$ba5f33d0$057ba8c0@farr.com> From: "jesse farr" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: under drive pulleys Date: Wed, 30 Mar 2005 13:53:14 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Kevin: When replying to George, can you make it plain text unless including photo or drawing ? jofarr, soddy tn (who has absolutely no right to request such over anybody else but doesn't want to see a good thing go away.) ----- Original Message ----- From: kevin lane no, these are just deep V pulleys. I don't know much about these things, but it seems to me that the gilmer concept introduces restrictions on sizes so that the integral number of teeth work out for the circumference. Rob recommended the deep V because at 9800rpm the centrifugal force on the belt makes it more likely to skip off. The motor we were looking at actually didn't have the deep V. I would think that the Gilmer pulley is a lot harder to machine, thus cost more. I assume we could make alt. pulleys too at whatever size we wanted, they don't look much different than the water pump pulleys.