Received-SPF: none
 receiver=logan.com; client-ip=67.15.10.31; envelope-from=bob@bob-white.com
Date: Wed, 9 Mar 2005 21:11:24 -0700
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: Mixture Settings
Message-Id: <20050309211124.0682d141.bob@bob-white.com>
In-Reply-To: <list-777595@logan.com>
References: <list-777595@logan.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit


Hi Rusty,

OK, here is the question that still seems to have an ambiguous answer.
For HIGH POWER settings, should I run rich of peak, and if so, how much?
This would be for takeoff and climb.  Bill's previous response seemed to
imply that running at stoichiometric mixture would maximize power.
(I'm assuming stoichiometric would be peak EGT.)  You are saying I
should be a little richer I believe.  I'm not concerned with the
economy setting, just the maximum performance settings.  I think the
piston engines will detonate if the mixture is too lean, especially at
high power settings.

Sorry for belaboring the point, but I really want to know.  :)  Where
do you actual rotary fliers set your EGT for TO?

Thanks,
Bob W. (rotary wanabe, Corona in the fridge)


On Wed, 9 Mar 2005 21:30:32 -0600
"Russell Duffy" <13brv3@bellsouth.net> wrote:

> So my belief that I need to run richer for the high power settings on the
> rotary is incorrect? 
> 
>  
> Hi Bob,
>  
> With all engines, it it true that best power is richer than 14.7 AFR.  Best
> economy is leaner.  Tracy tends to be... how shall I put this, "a cheap
> bastard" when it comes to cruise settings :-)   Rest assured, he ain't
> running best power unless he's racing, and probably not even then.  
>  
> Cheers,
> Rusty (fearing the wrath of the cheap bastard, especially after Ed drinks
> all his beer)
> 


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