Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.93.67.84] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2578925 for flyrotary@lancaironline.net; Sun, 14 Sep 2003 08:40:37 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-03.southeast.rr.com (8.12.5/8.12.2) with SMTP id h8ECcL4S021115 for ; Sun, 14 Sep 2003 08:38:25 -0400 (EDT) Message-ID: <001901c37ab7$187c29a0$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Reduce Inlet? Was Re: [FlyRotary] Re: Good news, Bad news Date: Sun, 14 Sep 2003 07:55:29 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Rusty, hang in there fellow. I had to modify my oil cooling arrangement FIVE times to get it right and you did it on your second try. I am on my 4th intake manifold, etc. Based on my recent experience in reducing my raditor inlet ducting by 30 % (from a total of 48 in^2 to 33in^2 and cooling was still adequate, you might try minimizing your inlet are first. I can't tell the size of it but it looks to be pretty large. Since you have coolant and oil air flowing through the one duct my estimate is that it does not need to total more than 72 in^2. If it is considerably more than that, it may be excessive (depending on the airflow and outlet under the cowl). Nope! Sorry no spare prop to lend Rusty. While Tracy Crook and others have reported hitting a "wall" with the IVO prop at around 175MPH that is still considerably higher than what Rusty is apparently getting. Drag goes up as the square of velocity (as best I recall), so a lot of drag just might be a large part of the problem, but I agree with Rusty it would seem that with the HP he is apparently generating he should be going faster even with that BUC. I would think the high drag cowl would affect his top end speed much more than his climb rate, but then finding out is what is all about. Stick with it Rusty Ed Smfrtdpm ----- Original Message ----- From: "Rick Girard" To: "Rotary motors in aircraft" Sent: Sunday, September 14, 2003 3:39 AM Subject: [FlyRotary] Re: Good news, Bad news > Russell, Maybe someone on the COZY list has an SAE 2 prop they'd let you > test with (pusher CCW prop is a tractor CW prop and vice versa) Might > take the guess work out real quick. Tracy, Ed, you got a spare prop or > know someone who does? > > Rick Girard > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html