Message-Id: <s61bcdd0.096@YCC.COM>
Date: Wed, 07 Oct 1998 20:19:07 -0500
From: "Bill Gradwohl" <Bill@YCC.COM>
To: lancair.list@olsusa.com
Subject: Engine question
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For those of you that know something about engines, please respond.

PSRU's are always a source of controversy. One of the problems with them is the
short shaft they have to absorb all the side loads placed upon them during
maneuvers. Other problems are the added weight, vibration, and the extra length
it puts on the engine PSRU combination. My idea is to get rid of the PSRU per se
but incorporate its function inside the engine in a way I've never heard
discussed before. 
 
Why can't the top of a V8 engine be designed to accept a "drive shaft" that runs
the whole length of the engine in a position where this drive shaft can be
directly used to support the prop. This drive shaft would be an integral part of
the engine, not an add on component. The drive shaft would get its power from
gears both front and back that take power from the crankshaft. The gears could
supply the necessary reduction while at the same time move the useable shaft
output power where it is needed with respect to where the prop needs to be. 
 
This drive shaft could have proper bearings all along its length, and since it
is at least as long as the crankshaft, it should be easier to support the side
loads. Oil that cools and lubricates the rest of the engine could also do the
same for the drive shaft.
 
I know that the top of the engine is crammed full of components. If one were to
arbitrarily say that the drive shaft MUST occupy some space towards the top as
needed to directly support a prop, could this be done and move all the
auxiliary equipment around it?

Thank You

Bill Gradwohl
IV-P Builder
N858B