X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao102.cox.net ([68.230.241.44] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2241032 for flyrotary@lancaironline.net; Fri, 03 Aug 2007 19:39:34 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.44; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao102.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20070803233859.FSKS7193.fed1rmmtao102.cox.net@fed1rmimpo01.cox.net> for ; Fri, 3 Aug 2007 19:38:59 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo01.cox.net with bizsmtp id Xbex1X00A1xAn3c0000000; Fri, 03 Aug 2007 19:38:57 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Tips on tuning Date: Fri, 3 Aug 2007 16:41:07 -0800 Message-ID: <000101c7d630$25650460$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0002_01C7D5ED.1741C460" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0002_01C7D5ED.1741C460 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable On 8/3/07, Al Gietzen wrote: Al, I think Chris B. brought this up earlier today. I didn't respond, but = you mentioned it, so then couldn't resist the urge to comment. To refresh everyone's memory, I have a 20B with a 76" 3-blade constant-speed M/T = prop. So, I can dial in the prop speed desired and the prop controller does = the rest. With it set to 2500 rpm, I'm seeing 7000 engine rpm on takeoff = rolls. (What a sweet sound! It makes those Lycosaurus' sound like farm = tractors.) It will turn about 6700 - 6800 during static runups. But this is a c/s prop, so your mileage may vary.=20 =20 Mark S. =20 What re-drive ratio do you have? I have 2.17 : 1. Are you running the = 76" MT over 3200 rpm? Al ------=_NextPart_000_0002_01C7D5ED.1741C460 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

On = 8/3/07, Al = Gietzen <ALVentures@cox.net> wrote:

Al,

I think Chris B. brought this up = earlier today. I didn't respond, but you mentioned it, so then = couldn't resist the urge to comment. To refresh everyone's memory, I have a 20B with a 76" 3-blade constant-speed M/T = prop. So, I can dial in the prop speed desired and the prop = controller does the rest. With it set to 2500 rpm, I'm seeing 7000 engine rpm on takeoff rolls. (What a sweet sound! It makes = those Lycosaurus' sound like farm tractors.) It will turn about 6700 - = 6800 during static runups. But this is a c/s prop, so your mileage may vary.

Mark S.

What re-drive ratio do you have? I have 2.17 : = 1. Are you running the 76” MT over 3200 rpm?

Al

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