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Date: Fri, 25 Feb 2005 10:53:15 -0500
From: Ernest Christley <echristl@cisco.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Racemate alt/water pump
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WRJJRS@aol.com wrote:

>We should look at the raw, open circuit, stator voltage as a 
>function of RPM, just to be sure that the stator will NOT overheat at 
>sustained high RPM.
>
>This is something that is understood. The Racemate alternator is designed for continuous high rpm from the start.
>Bill Jepson
>  
>

Bill, I'd like an electron pump on both sides of the engine, just 
because it would be so easy.  I've been looking at the Harley motorcycle 
alternators for the gearbox end as a off-the-shelf solution, but it may 
require rewinding to avoid this problem.  OTOH, there is no reason not 
to consider the Racemate unit for both sides.  The projected cost 
difference is insignificant and going all Racemate would mean only one 
development track to follow.  I think someone else mentioned it, but if 
they could design their rotor housing with a few options they could 
double potential sales.

option 1 - a 1" hole in the rotor to fit over the PSRU shaft.  Or they 
could make the hole standard and provide a plug for use on the pulley 
side of the engine.  The bolt holes that hold the pulley to the 
eccentric shaft will serve equally well to bolt it to the flex plate.

option 2 - make the pulley a removable outer shell, or a housing without 
the pulley.  This may or may not be all that valuable, but if everything 
goes according to the current plan, I won't have a need for belts.  No 
pulley will make the housing lighter, cheaper to manufacture, and look 
cleaner.

option 3 - a 'low-profile' design that would easily fit between the PSRU 
and engine.  Under 1.25" would work I think, but someone will need to 
measure this to be sure.

In any case, do you think they'd be willing to provide this list with a 
CAD drawing of what they design so that we can check our installations 
for 'dimensional compatibility'?  Maybe provide a feedback loop to 
increase their sales, and decrease the amount of work we have to do to 
make them fit our needs.