Again, my question:
From where do you have the idea, that belts are the major prolblem?

Thomas J.

Belts are a major problem.....Since my aircraft is a pusher (canard), the engine is mounted at the rear of the aircraft, just behind the main spar, which also carries both aileron push-pull tubes.  If a belt breaks there, it could easily take out my aileron control rods.  That is the major problem I have with belts.  Paul Conner, 13b powered SQ2000 canard

----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, November 06, 2004 2:33 PM
Subject: [FlyRotary] PM alternator/generator with EWP

Per the discussion of breaking belts...

Belts are needed for two things, the alternator and the water pump.  But
if we replace the water pump can we get rid of the belt?

Has anyone considered replacing the crank angle sensor with a PM
alternator/generator?

The things are relative simple (a can of coiled wire with some magnets
on a spinning shaft in the middle), but what effect would a spinning
magnet have on the hall effect sensor that drives the ignition system?

I've been looking at this a while.  It looks like a hole could be tapped
and threaded into the top of the crank angle sensor shaft.  A generator
with a threaded shaft would be screwed into that, properly oriented
threads insuring that the generator shaft will never come unscrewed, and
some straps on the housing to keep it from spinning.

A 35A generator, is < 500W would only need a few ft.oz. of retaining
force at 6000RPM.

The front pulley could be replaced with the same sort of installation.

Another consideraton.  Alternators have a heavy shell, bearings and
mounting because there is a substantial side loads and vibrations
derived from the belt.  A gear driven generator can be much lighter,
with just a sheet metal can for a housing.

I've got a number for an electrical engineer who is going to help me
work out the feasability and sizing for this application, but I'd like
the thoughts of anyone on the list.


-- http://www.ernest.isa-geek.org/
"This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."


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