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Old 12-26-2006 | 12:31 AM
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patnchris
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From: Gurnee, IL
Default RE: Prop selection ?

I will finish the build, tomorrow. Then I'll be able to weight it, decals and all......The MFG says the electric version should come in around
5 1/2 pounds....but the weight listed is with a brushed motor, gearbox, and nimh batteries....so I'm hoping for a little less than that.....Even so, E-Flight lists the Power 25 as being capable of 550 watts. If I can get close to these numbers, I'm sure I'll be happy.

A question about watt meters......Mine reads AMPS, VOLTS, WATTS, and cumulative ma......I have it wired with Dean's Ultra's, so it is plug n play with all my stuff...... However, I do not understand how powering up the plane, on the bench, can give a realistic reading. I would think that a prop moving through the air would draw far less power than one that is being restrained. Either way, I will get some readings, tomorrow....

Also........How does one measure prop RPMS????.......and how important would that be on a static bench test.....
As you can see I'm having a hard time relating motor performance, in the air, versus a static bench test....The motor may not be able to properly spin a 14 X 7 on a static bench test, but could be quite capable of spinning it in an airborne craft traveling 25-35 mph....