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Old Feb 28, 2003, 12:37 PM
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FX1SUB's Avatar
NJ
Joined Mar 2002
788 Posts
How to prop my Mega powered SB?

I have a Mega 16/15/7 on the way for my Switchback. What prop would be my best choice for this setup? Probably will be using HECELLs for batteries.
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Old Feb 28, 2003, 12:59 PM
Mountain Models Wannabe
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Ithaca, NY USA
Joined Mar 2001
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Do you have a Wattmeter? I think you'll want around a 9x4.7 but you'll want to base your choice on current draw. I'd try to limit your static current draw to less than 15 amps.

I can't help you much because all my testing with the Mega has been in the thin air of 6500'.

Doug
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Old Feb 28, 2003, 02:53 PM
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United States, CA, Bear Valley Springs
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I think Doug's choice is spot on. JUST under 15 amps according to P-Calc and should fly great at partial throttle. That's a Slowflyer prop, btw.
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Old Mar 10, 2003, 11:07 AM
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NJ
Joined Mar 2002
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Thanks for the help.....I'll give the 9x4.7 a try. I have a Craftsman digital multi meter but I haven't a clue on how to hook it up to get a reading. How is this usually done? I assume some sort of test stand has to be constructed, then hook up the motor (with prop), battery, and ESC through a wattmeter (multimeter) to measure amps. Is that correct? Maybe I should start a new thread in the "Open Discussion" forum to benefit others who would like to learn how this is done. I've been meaning to learn how, but my laziness has gotten the better part of me lately

Joe
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Old Mar 10, 2003, 11:20 AM
Mountain Models Wannabe
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Joe,

Most multimeters only read current up to 10 amps. You don't need a special stand, you just read the battery current while holding on to the plane.

Understand that you are measuring static current. In flight, the current will be lower. It is a good place to start though.

Doug
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