X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-yx0-f180.google.com ([209.85.213.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTPS id 5103949 for flyrotary@lancaironline.net; Thu, 25 Aug 2011 17:46:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.213.180; envelope-from=dale.rog@gmail.com Received: by yxi11 with SMTP id 11so4389941yxi.25 for ; Thu, 25 Aug 2011 14:45:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type; bh=i5BYr107FIdGVmKnS6afEBirJiuEb/pyAcI2wE8Rs5A=; b=PDu47zqlriH4TMtl7Roc4fPOwE/p4ELowpEpt24OGIi1z8gCxTgwVhnxmmK3MXs9Pg 7Cjp2hNfZA+e8j56qkPb8gM4IPcMylwsO+Ahb7kN2tD8eCCKqDpjakvi73944zaNjct5 dK2H7dbzufxeAVFVXX561dr+Jkgal0qd/Psoc= Received: by 10.142.204.21 with SMTP id b21mr128276wfg.219.1314308749055; Thu, 25 Aug 2011 14:45:49 -0700 (PDT) Return-Path: Received: from [192.168.1.107] (ip72-201-24-223.ph.ph.cox.net. [72.201.24.223]) by mx.google.com with ESMTPS id i1sm228227pbi.10.2011.08.25.14.45.47 (version=SSLv3 cipher=OTHER); Thu, 25 Aug 2011 14:45:48 -0700 (PDT) Message-ID: <4E56C26B.3010506@gmail.com> Date: Thu, 25 Aug 2011 14:45:15 -0700 From: Dale_R User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:6.0) Gecko/20110812 Thunderbird/6.0 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Props References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------020108030101060702000306" This is a multi-part message in MIME format. --------------020108030101060702000306 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit I can't speak from direct experience - yet - but the reason I'm planning on a Hertzler Silver Bullet is that several people have found that Gary's two blade had outperformed the Catto they had made for the same application. For example, Marc Zeitlin found he liked his new Silver Bullet better than the three blade that he'd had before. Problem is, one of those "other factors" is that for any given output, two blade usually has to be longer than a three blade. Too long on a pusher and it gets trimmed automatically on your first high-angle-of-attack landing. Dale_R COZY MkIV #0497 On 8/25/2011 1:53 PM, Tracy wrote: > Most efficient would be 2 blades. other factors may favor more > blades but that's a different question. > > Tracy > > On Thu, Aug 25, 2011 at 4:25 PM, Samuel Treffinger > > wrote: > > Hey, what would you recommend? A three or four blade prop? It will > be wood, so weight isnt such an issue, but which is more efficient > given the same power? > Sam > > -- Dale_R Cozy MKIV #497 --------------020108030101060702000306 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit I can't speak from direct experience - yet - but the reason I'm planning on a Hertzler Silver Bullet is that several people have found that Gary's two blade had outperformed the Catto they had made for the same application.  For example, Marc Zeitlin found he liked his new Silver Bullet better than the three blade that he'd had before.

Problem is, one of those "other factors" is that for any given output, two blade usually has to be longer than a three blade.  Too long on a pusher and it gets trimmed automatically on your first high-angle-of-attack landing.

Dale_R
COZY MkIV #0497


On 8/25/2011 1:53 PM, Tracy wrote:
Most efficient would be 2 blades.   other factors may favor more blades but that's a different question.

Tracy

On Thu, Aug 25, 2011 at 4:25 PM, Samuel Treffinger <samuel.treffinger@gmail.com> wrote:
Hey, what would you recommend? A three or four blade prop? It will be wood, so weight isnt such an issue, but which is more efficient given the same power?
 
Sam



-- 
Dale_R
Cozy MKIV #497
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