Return-Path: Received: from [65.54.169.176] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2777580 for flyrotary@lancaironline.net; Sat, 29 Nov 2003 18:48:43 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 29 Nov 2003 15:48:42 -0800 Received: from 67.24.247.38 by bay3-dav146.bay3.hotmail.com with DAV; Sat, 29 Nov 2003 23:48:42 +0000 X-Originating-IP: [67.24.247.38] X-Originating-Email: [lors01@msn.com] From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Brief flight report Date: Sat, 29 Nov 2003 18:48:40 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0006_01C3B6A9.67FB3330" Message-ID: X-OriginalArrivalTime: 29 Nov 2003 23:48:42.0601 (UTC) FILETIME=[51F71D90:01C3B6D3] ------=_NextPart_001_0006_01C3B6A9.67FB3330 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The Ivo pitch was reduced by ~6=E2=80=9D to 60=E2=80=9D in an effort to g= et more RPM/ power developed without reducing pitch too much and losing t= hrust. Acceleration was better and we lifted of in less than 1000ft and = climbed out at 1200 fpm. RPM never got above 4900 at WOT, but this is an= improvement of ~400 rpm from the previous setting. Should I reduce pitc= h more? This thing is almost fun now!! Tommy James<>< I think you could afford to reduce it a bit but it depends on a few other= things. How long is the prop? 3 blades or 2?. Try running two if you = now have 3. If length is over 72 you may want to shorten it but definite= ly try the un-doable things first. The problem with reducing pitch is th= at you may limit cruise & top speed and go above target max rpm. In my l= imited IVO prop testing I found that the spread between static and top sp= eed rpm was a lot higher than with my wood prop which gives me about 1000= rpm delta. The IVO gave me about 1500 as best I can remember. For this= reason, I target my static rpm at max desired rpm - delta. Tracy ------=_NextPart_001_0006_01C3B6A9.67FB3330 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
 
<= BLOCKQUOTE style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5= px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
The Ivo pitch was reduced= by ~6=E2=80=9D to 60=E2=80=9D in an effort to get more RPM/ power develo= ped without reducing pitch too much and losing thrust.  Acceleration= was better and we lifted of in less than 1000ft and climbed out at 1200 = fpm.  RPM never got above 4900 at WOT, but this is an improvement of= ~400 rpm from the previous setting.  Should I reduce pitch more?

This thing is almost fun now!!

Tommy James<><=

= I think you could afford to reduce it a bit but it depends on a few other= things.  How long is the prop?  3 blades or 2?.  Try runn= ing two if you now have 3.  If length is over 72 you may want to sho= rten it but definitely try the un-doable things first.  The pro= blem with reducing pitch is that you may limit cruise & top speed and= go above target max rpm.  In my limited IVO prop testing I found th= at the spread between static and top speed rpm was a lot higher than with= my wood prop which gives me about 1000 rpm delta.  The IVO gave me = about 1500 as best I can remember.  For this reason, I target my sta= tic rpm at max desired rpm - delta.

Tracy

------=_NextPart_001_0006_01C3B6A9.67FB3330--