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HelicopterOff Topics Planes and Jets › Need an electric plane guru! Static current draw​Vs. in flight current draw
10-07-2010 04:13 PM  7 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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What would be the difference if any between the static WOT current draw and the in flight level WOT current draw?

60% of the time, it works every time!

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10-07-2010 04:45 PM  7 years agoPost 2
S76 Mech

rrElite Veteran

Hatboro, Pa.

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FWIW, I wanted to know the same thing, so I did a static WOT measurement with my Watts Up meter, then I strapped the meter on-board for a flight and did the same thing. Really wasn't much of a difference at all. In flight used slightly more, but then again, your working all of the flight controls.

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10-07-2010 07:09 PM  7 years agoPost 3
STR8HUCKIN

rrApprentice

lodi ca

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It depends on the airframe. A 3d airplane has a lot of drag. If it is a slippery airframe then it will draw considerably less current at speed.

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10-07-2010 07:11 PM  7 years agoPost 4
ACKopter

rrApprentice

Florida

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In no way a guru but I have really got into planes and this is one thing I've looked into. First off, like every thing else there are far too many variables to give a definative answer. First look at your air frame. slow draggy frames will give similar results as what you would see in a static situation while a sleek/ fast design will alow the prop to "unload" in flight and of course you will see reduced amperage to the motor as the load decreases. Now, take a look at the prop. I asked this very question about a particular prop I was using (14x12) and how much my amps would decrease in flight, long story made short was that props that are square or near square will actuall be stalled in a static test and give lower amp readings than when the aircraft is in flight, essentially allowing the prop to get a good bite and as a result significantly raise the load/ amps on the power system.
I know this is not the answer you were looking for but in all honesty about all you can do is arm yourself with a watt meter, take your best guess and then test both static and in flight to see how your particular set-up works in this scenario.

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10-07-2010 08:02 PM  7 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Thanks for the replies guys. Its a Multiplex Funjet Ultra, its no F5B pylon racer but I guess its fairly 'slippery'?

Im using a 5.5 x 4.3, is that fairly square?

I have a watt meter but have only done a static test, I will do a flight with it on board, ill launch at 1/2 throttle, do a WOT level pass then land and see what the readings say.

60% of the time, it works every time!

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