X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mpls-qmqp-01.inet.qwest.net ([63.231.195.112] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with SMTP id 925568 for flyrotary@lancaironline.net; Fri, 13 Jan 2006 14:05:27 -0500 Received-SPF: none receiver=logan.com; client-ip=63.231.195.112; envelope-from=jsrccw@qwest.net Received: (qmail 19874 invoked by uid 0); 13 Jan 2006 19:04:40 -0000 Received: from unknown (63.231.195.1) by mpls-qmqp-01.inet.qwest.net with QMQP; 13 Jan 2006 19:04:40 -0000 Received: from 63-224-156-164.phnx.qwest.net (HELO ?127.0.0.1?) (63.224.156.164) by mpls-pop-01.inet.qwest.net with SMTP; 13 Jan 2006 19:04:40 -0000 Date: Fri, 13 Jan 2006 12:04:51 -0700 Message-ID: <43C7F9D3.6030902@qwest.net> From: "Jim Sevanick" To: "Rotary motors in aircraft" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 Subject: Re: [FlyRotary] Re: Props References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------030607040100070104080805" This is a multi-part message in MIME format. --------------030607040100070104080805 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit John, The 2700 prop rpm number came from my wanting to keep the engine rpm at about 7500 max. I am looking at the 2.85 gearbox from Tracy and if the IVO holds up it should give good t/o and climb as well as a decent cruise speed. I understand that the prop is good for a higher rpm. Jim. John Slade wrote: > Jim, > Where did the 2700 max prop rpm number come form? > That's 5860 engine rpm for me. I'm expecting to be able to go higher > than this - say 2950 > John > > Talked with IVO and 190-200HP, 2650-2700 max prop rpm, with > 200+mph cruise was feasible with 68" 3 blade on a Cozy MKIV. The > magnum 45 to 105 pitch adjustable. This puts the engine at 7500rpm > max. Does this provide a workable solution for a N/A 13B. > Watching other IVO in flight adjustable setups to see what works. > > Jim > > Tracy Crook wrote: > >> May work OK if you can use at LEAST 68" and have a 3 - 4 blade >> prop with LOTS of pitch. Talk to the prop makers for more >> precise requirements. They will need max prop rpm, top speed of >> AC, HP of eng, etc. >> >> Tracy >> >> ----- Original Message ----- >> From: Joe Berki >> To: Rotary motors in aircraft >> >> Sent: Friday, January 13, 2006 8:58 AM >> Subject: [FlyRotary] Props >> >> I have been watching the progress of those using the 2.85 >> PSRU with a large prop and was wondering how this combination >> could be made to work on a canard pusher. I am thinking of >> going with a P port engine so the 2.85 ratio would work, but >> i don't think the AC can handle a long prop due to ground >> clearance and rotation. Any thoughts? Thanks for any help. >> >> Joe Berki >> Limo EZ >> >> Sanding >> > --------------030607040100070104080805 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit John,
The 2700 prop rpm number came from my wanting to keep the engine rpm  at about 7500 max.
I am looking at the 2.85 gearbox from Tracy and if the IVO holds up it should give good t/o and climb as well as a decent cruise speed.  I understand that the prop is good for a higher rpm.
Jim.

John Slade wrote:
Jim,
Where did the 2700 max prop rpm number come form?
That's 5860 engine rpm for me. I'm expecting to be able to go higher than this - say 2950
John
Talked with IVO and 190-200HP,  2650-2700 max prop rpm, with 200+mph cruise was feasible with 68" 3 blade on a Cozy MKIV.  The magnum 45 to 105 pitch adjustable. This puts the engine at 7500rpm max.  Does this provide a workable solution for a N/A 13B.   Watching other IVO in flight adjustable setups to see what works.

Jim

Tracy Crook wrote:
May work OK if you can use at LEAST 68" and have a 3 - 4 blade prop with LOTS of pitch.  Talk to the prop makers for more precise requirements.  They will need max prop rpm, top speed of AC, HP of eng, etc.
 
Tracy
----- Original Message -----
From: Joe Berki
Sent: Friday, January 13, 2006 8:58 AM
Subject: [FlyRotary] Props

I have been watching the progress of those using the 2.85 PSRU with a large prop and was wondering how this combination could be made to work on a canard pusher.  I am thinking of going with a P port engine so the 2.85 ratio would work, but i don't think the AC can handle a long prop due to ground clearance and rotation.  Any thoughts?  Thanks for any help.
 
Joe Berki
Limo EZ
 
Sanding


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