Return-Path: Sender: (Marvin Kaye) To: lml Date: Wed, 31 Jul 2002 11:07:48 -0400 Message-ID: X-Original-Return-Path: Received: from www.dynacomm.ws ([198.22.63.66] verified) by logan.com (CommuniGate Pro SMTP 4.0b6) with ESMTP id 1660723 for lml@lancaironline.net; Wed, 31 Jul 2002 11:01:24 -0400 Received: from [10.0.1.201] (216-234-105-9.ded.det2.hexcom.net [216.234.105.9]) (authenticated) by www.dynacomm.ws (8.10.2/8.10.2) with ESMTP id g6VF1GH16791; Wed, 31 Jul 2002 11:01:16 -0400 Mime-Version: 1.0 X-Sender: lorn@pop.dynacomm.ws X-Original-Message-Id: In-Reply-To: References: X-Original-Date: Wed, 31 Jul 2002 11:01:17 -0400 X-Original-To: lml@lancaironline.net From: "Lorn H. Olsen" Subject: [LML] Re: turbine butterfly valve. X-Original-Cc: "Gordon Comfort" , "Loren Harmon" , "Jim Greeson" Content-Type: text/plain; charset="us-ascii" ; format="flowed" >I saw a turbine made in Argentina specifically for experimental >aircraft use. Even had a gear reduction down to 2500 rpm. Idle at 5 >gph >and 100% at 10 - 12 gph for 250 HP range at only 85 lbs. > >Bart D. Hull, bdhull@inficad.com The BSFC on my O-320 engine is between .42 at its best up to .50 at 10gph, 120BHp which is 75 percent power. George Braly has obtained down to .39 BSFC on IO-550s at 265BHp. http://www.Thielert.com/ claims a BSFC of .33 partly because of a 19/1 compression ratio. The claim above implies a .28 to .34 BSFC. The BSFC is proportional (given other parameters stay the same) to compression. Cheap turbine engines, without many compression stages, do not have high compression ratios. Therefore I would guess that the turbine above has a BSFC of between .60 and .70. If what I guess is correct, the fuel burn will be between 21 and 25 GPH at 250BHp. There is no magic carpet. -- Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp. 248-478-4301, mailto:lorn@dynacomm.ws LNC2, O-320-D1F, N31161, Y47, SE Michigan