Return-Path: Received: from sccrmhc11.comcast.net ([204.127.202.55] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 810056 for flyrotary@lancaironline.net; Fri, 18 Mar 2005 12:51:13 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.202.55; envelope-from=kenpowell@comcast.net Received: from 204.127.205.150 ([204.127.205.150]) by comcast.net (sccrmhc11) with SMTP id <2005031817502801100ssbj3e>; Fri, 18 Mar 2005 17:50:28 +0000 Received: from [166.102.160.133] by 204.127.205.150; Fri, 18 Mar 2005 17:50:27 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Engine size-negative G's Date: Fri, 18 Mar 2005 17:50:27 +0000 Message-Id: <031820051750.7974.423B14D300014FD400001F26220075115004040A99019F020A05@comcast.net> X-Mailer: AT&T Message Center Version 1 (Dec 17 2004) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_7974_1111168227_0" --NextPart_Webmail_9m3u9jl4l_7974_1111168227_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Randy, If you use Tracy's 2.85 redrive and turn 7500 to 8000 rpm 240 HP should be obtainable with a good intake and exhaust. Note that there is much disagreement as to what the correct lengths should be for both the intake and exhaust - be prepared to experiment. Also, no one that I am aware of is doing 'negative G maneuvers' with a rotary and I'm not sure how you would configure the oil system. Does anyone here know for sure? Ken Powell Bryant, Arkansas 501-847-4721 -------------- Original message -------------- > Gentlemen, > I am building an acro rated single seat biplane that the designer > has limited the max. engine size to IO-360. I am surmising that this > engine limitation is based on weight and airframe maximum speed. I have > decided to use rotary power and am slowly developing a plan as to what > I will use. I am looking for a little more help going "vertical." The > rotary weight (less) will be a bonus. I am not an engineer and am not > even related to one so my question: > Can I go to a P-port 2 rotor in the 230-240 hp range if I do not > exceed the max. airframe speed. > Thank you, > Randy > > > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_7974_1111168227_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Randy,

If you use Tracy's 2.85 redrive and turn 7500 to 8000 rpm 240 HP should be obtainable with a good intake and exhaust. Note that there is much disagreement as to what the correct lengths should be for both the intake and exhaust - be prepared to experiment. Also, no one that I am aware of is doing 'negative G maneuvers' with a rotary and I'm not sure how you would configure the oil system. Does anyone here know for sure?

Ken Powell
Bryant, Arkansas
501-847-4721

-------------- Original message --------------

> Gentlemen,
> I am building an acro rated single seat biplane that the designer
> has limited the max. engine size to IO-360. I am surmising that this
> engine limitation is based on weight and airframe maximum speed. I have
> decided to use rotary power and am slowly developing a plan as to what
> I will use. I am looking for a little more help going "vertical." The
> rotary weight (less) will be a bonus. I am not an engineer and am not
> even related to one so my question:
> Can I go to a P-port 2 rotor in the 230-240 hp range if I do not
> exceed the max. airframe speed.
> Thank you,
> Randy
>
>
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html

--NextPart_Webmail_9m3u9jl4l_7974_1111168227_0--