Mailing List flyrotary@lancaironline.net Message #17258
From: Bob White <bob@bob-white.com>
Subject: Re: [FlyRotary] Re: Big Butterflies, was: Bruce Turrentine Intake
Date: Tue, 15 Feb 2005 17:16:05 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

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
>


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