Received-SPF: none
 receiver=logan.com; client-ip=67.15.10.31; envelope-from=bob@bob-white.com
Date: Tue, 15 Feb 2005 17:16:05 -0700
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Big Butterflies,    was: Bruce Turrentine
 Intake
Message-Id: <20050215171605.6e6b7cb7.bob@bob-white.com>
In-Reply-To: <list-740165@logan.com>
References: <list-740165@logan.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit


Hi Jerry,

I noticed that the inlet to the TB has a slight taper and the actual TB 
throat is only about 58 mm.  Interestingly, That's also about 4.1 sq. 
in.  I have Tracy's RD-1C, so have some hope of making at 7500 rpm.
It fits real nice in the cowling.  I had Bruce bend it up so the TB was 
about 1 1/2 inches higher than if it was made horizontal.  If I had left 
it horizontal, the TB would have come real close to interfering with the 
rubber isolator on the engine mount.  I left the camera at home, so 
couldn't take any pictures.

Bob White

On Tue, 15 Feb 2005 13:04:43 -0500
Jerry Hey <jerryhey@earthlink.net> wrote:

> Bob,  that does seem  large.  For reference, the p port has two 
> butterflies for a TOTAL  of  4.1 sq in.  This was based on 
> calculations  done by Rolf and should be good up to 8000 rpm.  The 
> size is similar to  what Power Sport is using and what Paul Yaw has  
> recommended.   Jerry
> >


-- 
http://www.bob-white.com
N93BD - Rotary Powered BD-4 (soon)