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Russell Duffy wrote:
As I type, I'm also looking for a suitable flow meter, and I'm open for suggestions. The plan will be to rig this into my system, and find out once and for all what sort of flow I've got with both the mechanical, and EWP. I doubt there's any way to have this in place during flight, so Ernest will say it's not valid :-) No I won't! Just to be disagreable 8*)
The water flow system is closed loop and doesn't know whether you're in the air or not. Once the coolant is warmed to operating temperature, the flow provided by the pump will not change as long as you spin it at the same RPM. A ground test is perfectly valid for coolant flows.
If you have a head pressure generated by the pump and the voltage across the terminals while it is generating that pressure, then I can tell you what your flow rate is. In fact, here is a link to the chart so that you can get the flow rate for yourself:
http://ernest.isa-geek.org/Delta/Library/ewpv.xls
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