Return-Path: Received: from mail.tsisp.com ([65.23.108.44] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP-TLS id 324241 for flyrotary@lancaironline.net; Fri, 16 Jul 2004 21:50:13 -0400 Received-SPF: error receiver=logan.com; client-ip=65.23.108.44; envelope-from=steve@tsisp.com Received: from stevehome by mail.tsisp.com (Technical Support Inc.) with SMTP id CQA74584 for ; Fri, 16 Jul 2004 21:49:43 -0400 Reply-To: From: "Steve Brooks" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: 11th test flight Date: Fri, 16 Jul 2004 21:51:51 -0400 Message-ID: <040401c46ba0$a315a2a0$6400a8c0@WORKGROUP.local> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0405_01C46B7F.1C0402A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0405_01C46B7F.1C0402A0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Al, It was IAS and 10 may be slightly high too. It was probably more like 5 kts, but still noticeable. Steve -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen Sent: Friday, July 16, 2004 5:06 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 11th test flight The bad news is that the scoop appears to be costing me about 10 kts, which I was expecting. I also don't have any wheel pants yet on the main gear, so it's not like I'm out to win any speed test at this point anyways. My oil continues to run higher than the coolant which indicates to me that I need to do some more baffling to divert more air to the oil cooler. Steve; Are you comparing TAS or IAS? I suggest that there may be other reasons as well for the apparent 10 kt decrease in speed. Just as speed increases at as the cube root of hp, so does it decrease as the cube root of drag. That much decrease would suggest more than 20-25% increase in total drag, induced plus parasitic; more than could be expected from the change in scoop. FWIW, Al ------=_NextPart_000_0405_01C46B7F.1C0402A0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Al= ,

It= was IAS and 10 may be slightly high too.  It was probably more like 5 kts, but still = noticeable.

 

St= eve

 

-----Original Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen
Sent: Friday, July 16, = 2004 5:06 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = 11th test flight

 

 <= /p>

The bad news = is that the scoop appears to be costing me about 10 kts, which<= /p>

I was = expecting.  I also don't have any wheel pants yet on the main gear, = so<= /p>

it's not like = I'm out to win any speed test at this point anyways.  My = oil<= /p>

continues to = run higher than the coolant which indicates to me that I need<= /p>

to do some = more baffling to divert more air to the oil cooler.<= /p>

 <= /p>

Steve;<= /font><= /p>

Are you comparing TAS or IAS? I suggest that there may be other reasons as = well for the apparent 10 kt decrease in speed.  Just as speed increases at = as the cube root of hp, so does it decrease as the cube root of drag. =  That much decrease would suggest more than 20-25% increase in total drag, induced = plus parasitic; more than could be expected from the change in = scoop.<= /p>

 <= /font><= /p>

FWIW,<= /p>

 <= /font><= /p>

Al<= /p>

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