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Message
Another point that I'd like to bring up right
now is hose sizes. I often hear the statement that a car is only run on 30%
power on average and yet the auto manufactures use a minimum of 1 1/4" hoses for
coolant. But in our airplanes builders commonly use much smaller hoses &
fittings usually in order to use AN fittings of which I believe AN16 is the
largest (correct me if I'm wrong) and is only 3/4". I don't understand this
reasoning. I used 1 1/4" hoses up to the "T" where the rads are plumbed in
parallel, where I step it down to 2 -1"hoses. Even the "T's" were made with
minimum restriction in mind. If we have a higher power demand from the engine
(which is always used as a reason not to use EWP's), then why restrict it's
coolant flow?
Hi
Todd,
If I'm not mistaken, Tracy is using
3/4" hoses??? I've been using AN12 hoses, with two evap cores in
series, and there has never been a question of cooling the water on the
RV-3, even in severe climb tests. The antique
mechanical pump does have a lot of muscle, and might be making up
for it though, and I still haven't found a way to test the EWP by itself in
flight.
Cheers,
Rusty (wondering where my font
appeared)
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