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Message
( I admit I am NOT a fan of EWP quite yet...., however
stand to be corrected)
I think Rusty used one with success in hot weather. I'm also waiting
to see the EWP prove itself, but at least over here we're open to the
possibility.
The RV-3
has a Davies Craig EWP in series with the mechanical pump. The only
time I ever ran the EWP by itself, was during a ground test. I
was reluctant to fly it because I had to remove the alternator belt to
disable the mechanical pump. That also meant that the EWP only got 12V,
rather than the normal 13.8V or so that the alternator feeds it, which does make
a significant difference in the performance of the pump. Despite that, it
appeared to work just as well as the mechanical pump during a high power ground
run.
I had every intention of
running a pair (one and a backup) of EWP's on the single rotor Slingshot, but
there was no installation advantage to be gained in this case. I had a
brand new water pump housing assembly, and no conflicts with space to install
it. In fact, mounting the EWP's would have been far more trouble than
using the stock pump in this case. Now if I put a single rotor in the
Sonex... (not that I would of course, wink, wink, nudge,
nudge).
Cheers,
Rusty (single rotor should
be running in about a month)
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