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Posted by DingoII | Aug 13, 2017 @ 04:50 AM | 1,840 Views
I have been fascinated by the EDF for some time. I came across the EDF just few months ago when I "impulsively" added the DuraFly Vampire to my shopping cart at the Hobbyking site.

I did some bits of the EDF theory (please see it attached) during my holiday (cannot just swim and drink a do nothing else ;-) ) and then also measured the Vampire performance:

Flying at full throttle (interleaved with gliding) gave 4.5 minute of powered fligth. Recharged 2610 mAh into 4S-2650. This gives about 33 A, or 520 W of input power.

Max. speed measured by GPS telemetry was about 100 km/hr (scattered between 93 and 113 km/h in several passes). The landing speed was about 27 to 32 km/hr.

Then I devised a simple U-tube differential pressure gauge. It is just a piece of tubing taped to a vertical scale. The ends of tube are then introduced into the location od interest (please see the pictures). The pressure difference across the impeller measured at full throttle was about 180 mm of water column, without the access hatch is was just about 60 mm.

Well, all this data fall within the expected range of values, and although I would not expect them to be 100% accurate, seem to confirm that the theory works.

Thanks, Jan