Return-Path: Sender: (Marvin Kaye) To: lml Date: Sun, 07 Jul 2002 19:21:05 -0400 Message-ID: X-Original-Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 4.0b4) with ESMTP id 1620783 for lml@lancaironline.net; Sun, 07 Jul 2002 15:34:33 -0400 Received: from gull.mail.pas.earthlink.net ([207.217.120.84]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Sun, 7 Jul 2002 15:28:18 -0400 Received: from sdn-ap-008watacop0178.dialsprint.net ([65.176.72.178] helo=f3g6s4) by gull.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 17RHnk-00078g-00 for lancair.list@olsusa.com; Sun, 07 Jul 2002 15:34:33 -0400 X-Original-Message-ID: <001a01c225ed$2db4dda0$b248b041@f3g6s4> Reply-To: "Dan Schaefer" From: "Dan Schaefer" X-Original-To: "Lancair list" Subject: Re: prop X-Original-Date: Sun, 7 Jul 2002 12:33:30 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Regarding Jack Plavcan's question about his 235's prop. Jack, if memory serves me right, your 58X70 sounds quite short. Before I changed to a MT, I tried three different mfg's props (Aymar-Demuth, Props Inc.and the Ivoprop variable-pitch) and I think they were all 62 inch diameter (don't remember the pitch for the fixed pitch units but I think it was maybe 72 in. - Prop's Inc. unit is in storage and I'll look next week when I return from fishing). I could never get the Ivoprop to quit breaking the hub stress tell-tales and returned it to the mfg. (The tell-tales indicate relative movement between the individual blades at the root attachments). It's a great idea and if you can make it work on your airplane, I think you'd like it. Just be sure to get a committment from Ivo that if you can't keep the tell-tales from breaking, it can be returned. With both of the fixed props, I turned approx. 2350 -2450 RPM on start of take-off (at sea level) and as I accelerated, it would run up to about 2650 for cruise. With this little engine, I flight planned for about 160 knots so I figured my prop was working pretty good. Of course, take-offs were not too sprightly with the static RPM so low but I was careful and I enjoyed the cruise. Incidentally, I do not recommend the Aymar-Demuth as I had two of them fail, one catastrophically just at rotation, at a lamination glue line. Very scary! The Props Inc. unit is quite a bit more robust and Jeff (at P.I.) reworked his first cut to bring the RPM up a little for just the shipping charges. I didn't put many hours on it before changing to the MT but I liked it. Of course, if you can do it, the MT electric C/S two-bladed prop is the perfect match for the 235 airframe. Good luck, Dan Schaefer Early 235, N235SP