X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0c4) with ESMTP id 761885 for flyrotary@lancaironline.net; Tue, 11 Oct 2005 15:17:53 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j9BJH41v020767 for ; Tue, 11 Oct 2005 15:17:07 -0400 (EDT) Message-ID: <000f01c5ce98$62a5c8b0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: More Lycoming Problems Date: Tue, 11 Oct 2005 15:16:40 -0400 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine Actually, Dave, in my failure, I lost over 1/2 of power producing capacity since I lost all 3 chambers on the Front (No.1) rotor and we know that losing 1/2 of displacement means a loss of more than 1/2 power. No question if you only loose one cylinder AND that failure does not cause further problems then you have only lost approx 1/4 or 1/6 of your power producing elements. So if the failure is a simple Piston ring then you may not even notice it - but if is a blown piston or connecting rod then, of course, you could be talking about the possible disintegration of the a piston engine. Personally, I'll take 1/2 degradation of the rotor over 1/4 degradation of a piston engine - the main reason is - I am confident the rotary will stay together. Ed ----- Original Message ----- From: "Dale Rogers" To: "Rotary motors in aircraft" Sent: Tuesday, October 11, 2005 1:45 PM Subject: [FlyRotary] Re: More Lycoming Problems > Ed Anderson wrote: > >> I agree, Dave. >> >> Even after I lost the apex seals and rotor on way to Sun & Fun in April >> and flew back on one rotor, I knew that few reciprocating engines would >> have done nearly as well on only 1/2 their cylinders. Just further >> confirmed my opinion that the rotary - like all things mechanical - can >> break but does so with the most graceful degradation of performance >> >> Ed. > > > Just playing devil's advocate here. A lot of the recent failures noted > on the two canard lists involve only a single cylinder. So they are only > losing 1/4 or 1/6 their power output. OTOH, on the rotary, every *engine* > failure mode I can think of will cost the flyer a minimum of two faces - > 1/3 the engine's capacity. > > WRT Dave's failure ... how much of an effect would a broken piston ring > yield? Usually, no the whole 25% which that cylinder is worth on a > Lycosaurus 4 banger. > > Nevertheless, Dave's total engine rebuild is going to cost far less than > the cost of repairing the damage from a single broken ring on a Lyc. > > Dale R. > COZY MkIV #1254 > R13B still mid-build > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ >