Jerry Hey wrote:

 > >> Jerry wrote:

 >>
 >> > Here are two pics of my alternater installation.   Still don't know
 >> > if the water pump will be as shown without thermostat or back to the
 >> > tall outlet with a thermostat.  I got to dream about that some more.

 >> Jerry,
 >> I forsee two problems with your alternator & water pump installation:
 >>
 >> #1. The belt wrap on the water pump is so little, I wonder if the belts
 can transfer
 >> the needed horsepower without slipping.  Slipping, of course, is bad not
 only because
 >> you aren't getting the power transferred, but also because it overheats
 the belts
 >> which can eventually lead to early belt failure.  I think you need a
 backside idler
 >> pulley between the water pump and the alternator to give a few more
 degrees of
 >> contact.
 >>
 >> #2. If you are counting on the double row of belts to provide redundancy
 in the event
 >> that one of the belts fails, you're in for a surprise.  A failure of one
 of the belts
 >> will likely cause the other belt to fail because of the belt debris from
 the first
 >> belt failure.  If you can slip a bit of perforated sheet metal between
 the two belts,
 >> and maybe even "cage" both belts with more perforated sheet metal, then
 the system is
 >> more likely to survive the failure of one belt.
 >>
 >> Russell Kent

 >Good point Russell. Thanks for catching that. I had to add an idler
 >on my set up to get the wrap on the e-shaft pulley.
 >
 >Somebody mentioned a serpentine belt and in some case some
accessories might
 >be able to be driven by the back side of the serpentine belt if one has
 >at least 180 degrees of wrap. Probably just the alternator. I now notice
 >that Summit Racing is selling serpentine pulleys. Another possibility is
 >a cog belt drive.
 >
 >Paul Lamar

 Paul,

 I believe that the multivee belts are supposed to carry more
power.  Might work
 with a smaller wrap angle.  I agree that dual belts side-by-side is NOT
 redundant due to belt debris.  A divider may help.

 Bill Freeman
 Long EZ builder & pilot
 BSME, MSME

That's right.  I am able to turn the engine over by rotating the
water pump pulley.  I don't anticipate a slippage problem.    - Jerry

Near zero RPM Jerry. When it gets water in it and it is
running at 6000 RPM could be another story. Keep an eye
on it for signs of slippage when you get going.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org