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WRJJRS@aol.com wrote:
In a message dated 2/23/2005 10:34:34 PM Pacific Standard Time, haywire@telus.net writes:
Just to confirm this... We are talking about a non-belt driven PM
alternator only without a water pump, with the stator mounted
directly to
our existing front cover, via some sort of adapter (or a cu$tom front
cover?) and the rotor would take the place of the existing pulley
mounted on
the e-shaft, and have the outer surface of the rotor machined as a
pulley/belt drive for a main alt. (or water pump for you non-EWP
types)
Does this sound about right?
Todd, Got it in one try. You are correct. Since my 20B is serpentine I would hope that is possible yes. They make a 32 amp version which would run most planes as a primary if you don't fly with the landing lights on all the time. I believe the intent is to provide a bracket to fit the front cover, since a new cover would be VERY expensive. The same unit would probably be fitable to the PSRU if you wanted to get creative. Barret Engineering (The Parent Co) could probably provide the flattest pulley or just a magnet holding cup to fit in the PSRU. You would have to provide all the dimensions though. Since it would be custom it would probably cost more. (most one-off things do)
Bill Jepson
I'm hoping that the motorcycle units will fit off-the-shelf. All the information I've found so far has indicated that they will. Todd is correct that I don't have a RD-1x, but I am using the same gearset. The issue would be the spline pattern on the sun gear shaft. Is it the same diameter, does it have the same number of spines, and is there enough spline available in front of the flex plate to fit the rotor on? I know the hole in the rotor is a 1" diameter, 10-spline hole. This matches the shaft I have, and I expect that it also matches Tracy's. Could someone post a picture of the sun gear shaft of a mounted PSRU by looking down between the attach plate and engine? Having a ruler somewhere in the picture would be helpful. I'd just like to know that there is at least 1.25" clear behind the PSRU and that some splines are showing .
Bill, with a few caveats, I'm on the bandwagon for the Racemate unit. The first is cost. I consider the $250 number being tossed around to be reasonable. The bigger issue is clearance. With the two units and EWP, I won't need a belt. So, if it is designed as a pulley, I could easily enough put it on a lathe and turn down the pulley sides. That'll save an insignificant amount of weight and give me another 1/2" between the crank and my nosewheel shaft.
Todd, I'm running with this as hard as I can, but I still have a log row to hoe. I'll get construction details together in a few weeks, but it is still going to be a while before I have a running engine. Last night I got most of the excess aluminum cut off my PSRU housing. The weight is down to 28.5lbs from an initial 33, and I hope that the final cleanup will yield another 1/2lb. I'm going to switch over to finish my wing ribs after I get the PSRU finalized. But it is all exciting right now. Having the generators bolted on and hidden away will really lighten, and clean up the engine installation. Just a block without all the belts and ungainly components sticking off willy-nilly.
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