X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 22 Jul 2012 13:00:27 -0400 Message-ID: X-Original-Return-Path: Received: from mail-ob0-f180.google.com ([209.85.214.180] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5672214 for lml@lancaironline.net; Sun, 22 Jul 2012 08:33:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.214.180; envelope-from=mwsletten@gmail.com Received: by obbuo19 with SMTP id uo19so6855446obb.25 for ; Sun, 22 Jul 2012 05:33:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.182.31.102 with SMTP id z6mr15921833obh.66.1342960403214; Sun, 22 Jul 2012 05:33:23 -0700 (PDT) Received: by 10.76.128.18 with HTTP; Sun, 22 Jul 2012 05:33:23 -0700 (PDT) X-Original-Date: Sun, 22 Jul 2012 07:33:23 -0500 X-Original-Message-ID: Subject: Re: New Turbine Engine From: Mark Sletten X-Original-To: Lancair Mailing List X-Original-Cc: Wolfgang@MiCom.net Content-Type: multipart/alternative; boundary=14dae93b595ac7f22204c56a5541 --14dae93b595ac7f22204c56a5541 Content-Type: text/plain; charset=ISO-8859-1 I think Rob's point is that the Lancair (or other aircraft designed around recips) isn't the only kind of aircraft this engine might be used for. A particular installation might prioritize size/weight of powerplant over weight/cost of fuel. --Mark What's there to disagree with ? At 10 gph more that's 180 lbs more in take off weight for a 3 hour flight. A piston engine consumes about 0.5 lbs/hp/hr That turbine is just over 0.8 lbs/hp/hr For 200 HP output, that difference is 10 gph . . . so 125lb turbine + extra fuel or 305lbs for a piston and less fuel cost . . . for the life of the engine. . . . take your pick. Wolfgang ----- Original Message ----- *From:* rwolf99@aol.com *To:* lml@lancaironline.net *Sent:* Friday, July 20, 2012 10:11 PM *Subject:* Re: New Turbine Engine I have to disagree with Wolfgang on this one, but I do accept his premise that a 240 HP turbine will consume a lot more fuel than a 240 HP recip. But the amazing thing is getting 241 HP out of a 125 pound engine. *That* is impressive! Put it in context - my IO-360 gets 180 HP and weighs 260 pounds. Marv's engine provides 33% more horsepower and weighs less than half. We can run every comparison under the sun and argue all day long to no conclusion -- how much extra fuel weight we need to carry, how much less engine weight we need, and so forth -- but the bottom line is that this little engine enables some aircraft designs that just would not be possible with a recip. - Rob Wolf --14dae93b595ac7f22204c56a5541 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

I think Rob's point is that the Lancair (or other aircra= ft designed around recips) isn't the only kind of aircraft this engine = might be used for. A particular installation might prioritize size/weight o= f powerplant over weight/cost of fuel.

--Mark





What's there to disagree with ?
At 10 gph more that's 180 lbs more in take off wei= ght for a=A03 hour flight.
A piston engine consumes about 0.5 lbs/hp/hr
That turbine is just over 0.8 lbs/hp/hr
For 200 HP output, that difference is 10 gph
. . . so 125lb turbine + extra fuel or 305lbs for a pi= ston and less fuel cost . . . for the life of the engine.
. . . take your pick.
=A0
Wolfgang
=A0
----- Original Message -----
From:=A0rwolf99@aol.com<= /div>
Sent:=A0Fri= day, July 20, 2012 10:11 PM
Subject:=A0Re: New Turbine Engine

I have to disagree with Wolfgang on = this one, but I do accept his premise that a 240 HP turbine will consume a = lot more fuel than a 240 HP recip.
=A0
But the amazing thing is getting 241 HP out of a 125 pou= nd engine.=A0 *That* is impressive!
=A0
Put it in conte= xt - my IO-360 gets 180 HP and weighs 260 pounds.=A0 Marv's engine prov= ides 33% more horsepower and weighs less than half.=A0 We can run every com= parison under the sun and argue all day long to no conclusion -- how much e= xtra fuel weight we need to carry, how much less engine weight we need, and= so forth -- but the bottom line is that this little engine enables some ai= rcraft designs that just would not be possible with a recip.
=A0
- Rob Wolf
--14dae93b595ac7f22204c56a5541--