X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 11 Sep 2005 09:31:59 -0400 Message-ID: X-Original-Return-Path: Received: from mta9.adelphia.net ([68.168.78.199] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 717566 for lml@lancaironline.net; Sat, 10 Sep 2005 08:34:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.199; envelope-from=glcasey@adelphia.net Received: from [70.34.88.6] by mta9.adelphia.net (InterMail vM.6.01.04.01 201-2131-118-101-20041129) with ESMTP id <20050910123355.EBIM24716.mta9.adelphia.net@[70.34.88.6]> for ; Sat, 10 Sep 2005 08:33:55 -0400 Mime-Version: 1.0 (Apple Message framework v733) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-2--127936957 X-Original-Message-Id: <96468EDD-405A-4913-B886-2EBA6D9A4F21@adelphia.net> From: Gary Casey Subject: Re: Another way to look at the Innodyne X-Original-Date: Sat, 10 Sep 2005 05:33:54 -0700 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.733) --Apple-Mail-2--127936957 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed > > Gary, how much would the allison give at 24,000 feet? > I assume it's considerably less than a tsio-550. > > Colyn The whole alternate engine thing is very frustrating. Consider that a spark-ignition engine is inherently better in small sizes, while a turbine is inherently better at the larger sizes. Although a turbine- powered leaf blower would rock. Anyway, I've analyzed the data every which way, turning, twisting and smashing the numbers bloody and the result was that our power levels (below 700 maybe) the best compromise is a large-bore spark-ignition air cooled piston engine. A highly-boosted water-cooled piston engine looked interesting, but the weight and potential failure modes killed it in my analysis. Right back where I started. I couldn't find that magic silver bullet no matter where I looked. Back to your question, I don't know how much the Allison (Rolls Royce) is flat-rated, but I would guess that the TSIO-550 is at least capable of more power at 24,000. A not-overpowered turbine installation - a 450 hp turbine instead of a 350 hp piston engine - is probably no faster at altitude than a piston engine. But will get there a lot faster. Gary Casey --Apple-Mail-2--127936957 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1

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=A0
Gary,=A0=A0 how much would the allison give at = 24,000 feet?
I assume = it's considerably less than a tsio-550.
=A0
Colyn

The whole alternate engine = thing is very frustrating.=A0 Consider that a spark-ignition engine is = inherently better in small sizes, while a turbine is inherently better = at the larger sizes.=A0 Although a turbine-powered leaf blower would = rock.=A0 Anyway, I've analyzed the data every which way, turning, = twisting and smashing the numbers bloody and the result was that our = power levels (below 700 maybe) the best compromise is a large-bore = spark-ignition air cooled piston engine.=A0 =A0A highly-boosted = water-cooled piston engine looked interesting, but the weight and = potential failure modes killed it in my analysis.=A0=A0Right back where = I started.=A0 I couldn't find that magic silver bullet no matter where I = looked.

Back to your question, I = don't know how much the Allison (Rolls Royce) is flat-rated, but I would = guess that the TSIO-550 is at least capable of more power at 24,000.=A0 = A not-overpowered turbine installation - a 450 hp turbine instead of a = 350 hp piston engine - is probably no faster at altitude than a piston = engine.=A0 But will get there a lot faster.

Gary = Casey
= --Apple-Mail-2--127936957--