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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2016608@logan.com>
Subject: Re: [FlyRotary] Throttle body size
Date: Sun, 29 Apr 2007 20:26:07 -0400
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Hi Buly,

I have tired throttle bodies as big as 75mm, I went back to a 65 mm Mustang 
Throttle body.  Here is what I found.

The larger throttle body provided no measurable increase  in power 
produced - in fact, the power actually went down as my static fell 200 rpm. 
I did find that suddenly opening the large 75mm TB would cause the engine to 
bog and hesitate for a second.  It was suggested that I push the throttle in 
more slowly, well, Scotty, when I want full power I want it NOW!

In any case, I now fly and have flown with the 65 mm for 3 years.  I can 
turn 6000 rpm static on a standard day and upto 6200 static on those 
wonderful cold mornings. I can shove the throttle in as fast as I  can and 
there is no bog or hesitation.

That is what my experience has been.  For a full up all out race engine, I 
am certain Paul's suggestion has merit, but for our usage, I did not find a 
large TB provided any improvement and actually make flying less pleasant.

Ed

----- Original Message ----- 
From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, April 29, 2007 6:05 PM
Subject: [FlyRotary] Throttle body size


>I originally planned and tried TA set up on my Cosmo 13B. Soon after  the 
>first few flights removed the turbo and vent NA. At the time did  not pay 
>much attention on the throttle body size, counting on the  turbo to make up 
>for any losses. Today I measured the inside opening  of the TB and was 
>surprised to find it was only 60mm. This is rather  small. Paul Lamar on 
>his visit also said I should get a bigger one. I  wander what size TB other 
>people are using, or any comments and  suggestions on the matter will be 
>helpful.
>
> Buly
>
>
>
>
>
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