From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Re: supershargers
To: lml
Date: Tue, 15 Mar 2005 15:15:00 -0500
Message-ID: <web-794890@logan.com>
In-Reply-To: <1e8.371bee12.2f688d8e@aol.com>
References: <1e8.371bee12.2f688d8e@aol.com>
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Posted for REHBINC@aol.com:

  Expanding ever so slightly on George's statement:
  
  During periods when you can't possibly make too much power, there really
  isn't a need for compressor speed control. However, much of the time you
either
  need, or want, to operate at lower power settings than the engine is capable
of,
  such as taxiing and low altitude flight. In such conditions you can use the
  throttle to reduce manifold pressure, or you can reduce the compressor
output,
  or both. Since it takes power to run the compressor, it is much more
efficient
  to reduce the compressor output. In periods where the limiting factor is
  manifold pressure or cylinder temperature, the reduction in compressor 
output
  diverts additional power to the propeller, so you climb faster while you 
save
fuel.
  
  Remeber that an engine is most efficient with the throttle wide open.
  
  Rob