----- Original Message -----
Sent: Sunday, May 01, 2005 8:25 PM
Subject: [FlyRotary] Re: Ed's new rotor
housings
John
Slade wrote:
My
understanding is that the pumps, at least the ones I'm using (or at least WAS
using when I used to be able to fly this #@#$ing
thing, long ago), are designed to run continuously. I have one
Walbro Inline fuel pump-GSL393 (from Tracy) and one Walbro Inline fuel
pump-GSL394 from Lightning Motorsports. Both have metal screw in
connectors which fit AN adapters. They're fused at 20
amps.
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OK,
I'll stir the pot some more. I am not an electrical engineer, but I do
understand the power of redunancy!
I
will take two separately fused circuits over 1 circuit breaker every day of
the week. If there is a short in my one device or in the power supply lines, I
do not wish to be starting a fire by resetting circuit breakers while looking
for a glider port. I know there are rotary powered airplanes out there that
depend on one circuit breaker for the entire electrical engine power source
that have many, many more hours of rotary time than me, but I sleep better
have two parallel circuits bringing electrical power to my fused engine buss
and then reduntant pumps on entirely separate fused circuits. My pumps are
both checked during run up and both on during T/O and
landing.
Bernie
I've got
to up the anti myself. I agree with Bernie, I prefer two separate
circuits, one for each pump both of which are however, protected by
separate circuit breakers vice fuses. Having flown over 2000 hours in
military aircraft as an Electronic Warfare type, there has been numerous
times, I was able to get a system that was temporarily kicked off-line by a
power surge, intermittent cable /connector problem, etc. Working again.
Resetting the circuit breaker would "SOMETIMES" bring them back on line
functioning. You do not have that possibility with a blown
fuse.
Yes, most
of the time whatever would pop a fuse will keep a circuit breaker popping as
well - BUT, there are intermittent problems where the ability to push a
circuit breaker back in can save the day. Nothing against fuses, I do
use them in non-flight critical areas.
Personal
opinion, of course
Ed