X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-gw0-f52.google.com ([74.125.83.52] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4328016 for flyrotary@lancaironline.net; Thu, 27 May 2010 09:41:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.83.52; envelope-from=david.staten@gmail.com Received: by gwj20 with SMTP id 20so3946977gwj.25 for ; Thu, 27 May 2010 06:41:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=pcLt3DVvSk56fwRA1hqtte4hdISeA8G7n7CbOHIu2P4=; b=ZisjgC2R15Mp61tvREkLjAG4rURZ02XFQ+hzFtin7RpbyjsIlJpAnVutCEEp+k36uN WWR9QT2cQ+ZVD3JS7xoGzt2HGsFtkXh2H77WtPHTiheCG7qZ15YNKKhRiOM1c7F1WBiD ecxvq02IgHLh5tKmhiptK6CMrMC3beO6S3oQ0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=Kjd7hFFoKEyIJmA6UZLNMZyY1Ehr2K9h7okNYL0RZ//uapDetKmlit2AQKWmOCU374 zBwRDtI9cNYzoGjny7mBSnarlpwDuJKP5SzeTnD6dFw1YWi/eov5xrW9LBiD1+bxeEnF 8z5il+3lNOQO89pNeY5ERY1ewA9QyEiQ4Iflw= MIME-Version: 1.0 Received: by 10.231.79.74 with SMTP id o10mr804704ibk.36.1274967666693; Thu, 27 May 2010 06:41:06 -0700 (PDT) Received: by 10.231.16.194 with HTTP; Thu, 27 May 2010 06:41:06 -0700 (PDT) In-Reply-To: References: Date: Thu, 27 May 2010 08:41:06 -0500 Message-ID: Subject: Re: [FlyRotary] Re: Rotary HP reviisted....now that I know more about it all...kinda. From: David Staten To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016e64136bcdf97c70487938afc --0016e64136bcdf97c70487938afc Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Ed's words are a very important detail that anyone with an IVO or an adjustable speed (but not constant speed) prop Chris.. are you going to install the IVO constant speed attachment? This would take care of much of the concern that Ed is alluding to. As you accelerated and the load "decreased" the plane would try to spin the prop faster (or if you opened the throttle more, and the engine tried to turn faster).. the constant speed module would then increase/coarsen pitch to maintain the set RPM... keeping you at a good HP producing/torque producing RPM setting, but increasing thrust while maintaining RPM. Dave On Thu, May 27, 2010 at 8:06 AM, Ed Anderson wro= te: > No easy answer =96 to all the nuances of producing power, Chris. > > This is important, Chris. Years ago, there was a long EZ builder who ha= d > a non-rotary auto engine who unfortunately ended his first flight in a fa= tal > crash into a cactus plant. He understood the electronics just fine, but = did > not understand the relationship between rpm and thrust. He set his > adjustable pitch prop for *maximum RPM* =96 which mean *minimum prop load= *, > which in his case mean *minimum thrust*. He managed to get airborne with > this limited thrust, but could not apparently climb out of ground effect > with the flight ending on impact with a cactus. > > Ed > --0016e64136bcdf97c70487938afc Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Ed's words are a very important detail that anyone with an IVO or = an adjustable speed (but not constant speed) prop
=A0
Chris.. are you going to install the IVO constant speed attachment? Th= is would take care of much of the concern that Ed is alluding to.
=A0
As you accelerated and the load "decreased" the plane would = try to spin the prop faster (or if you opened the throttle more, and the en= gine tried to turn faster).. the constant speed module would then increase/= coarsen pitch to maintain the set RPM... keeping you at a good HP producing= /torque producing RPM setting, but increasing thrust while maintaining RPM.=
=A0
Dave

On Thu, May 27, 2010 at 8:06 AM, Ed Anderson <eanderson@c= arolina.rr.com> wrote:

No easy answer = =96 to all the nuances of producing power, Chris.

=A0This is important, Chris.=A0 Years a= go, there was a long EZ builder who had a non-rotary auto engine who unfort= unately ended his first flight in a fatal crash into a cactus plant.=A0 He = understood the electronics just fine, but did not understand the relationsh= ip between rpm and thrust.=A0 He set his adjustable pitch prop for maximum RPM =96 which mean minimum prop load, which in his cas= e mean minimum thrust.=A0 H= e managed to get airborne with this limited thrust, but could not apparentl= y climb out of ground effect with the flight ending on impact with a cactus= .

=A0

Ed

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