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Message
Hi
Rusty;
These recent EWP emails reminded me that I'd not answered
all of my previous mail on the subject. Bob had also asked if a
paddlewheel flowmeter would require a correction factor. Truthfully, yes it
should as it is calibrated for water at 21C, however it really is insignificant
as it is still accurate to 1% over its entire range at temps of up to 105C
(220F).
Does this change in
viscosity actually translate into an equal change in flow rate? If so, you
have to wonder if anyone has tested the EWP's at normal engine temps.
I know Todd had his set
up for in-flight flow measurements. How about it Todd? Did you see
significantly more flow when hot?
To
answer this I'd have to refer to operating with the EWP controller bypassed, so
the pump current is equal regardless of coolant temp. In these operating
conditions, I don't recall seeing any noticeable difference in flow rates at
varying temps (hot - cold). To give a more definitive answer I'd need to
actually log this... or have a datalogger :-)
Todd
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