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Help me choose Prop please..

Old 10-08-2003, 04:22 AM
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Downwind3Zero
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Default Help me choose Prop please..

Hi all,
Using Crazy Sparow Stryro Kit, 8 cell 500AR batt pack, Speed300 and gear 4.5:1 - which Prop?

also..

Crazy Sparow Stryro Kit, 8 cell 500AR batt pack, Speed3280 and gear 4:1 - which Prop?

Would really appreciate suggestions

PS: Burned out 2 Speed 280 w/ above setup using 9x6 Prop!?
Old 10-11-2003, 04:56 PM
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Wingman33
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Default RE: Help me choose Prop please..

Apc 7x6 tops .this will be the max you can put on that comb or a Apc7x4 electric .
Old 10-12-2003, 08:41 AM
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Dr Kiwi
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Default RE: Help me choose Prop please..

Hi downwind3zero,

Again - use this FIRST!

http://brantuas.com/ezcalc/dma.asp

That would have told you a 9x6 was a no, no!

Cheers, Phil

I trust my renegade and less than patriotic countrymen (Brad Butterworth et al.) are happy in Switzerland with the Americas Cup - tell them to keep it polished until real Kiwis come and take it back in a couple of years time!
Old 10-13-2003, 07:29 AM
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Matt Kirsch
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Default RE: Help me choose Prop please..

Well, technically P-Calc wouldn't "tell" you that it was a no-no. There won't be any sirens wailing or red flashing lights. The only way you'd know it was a no-no is if you knew how much current the motors could take.

8 cells, Speed 280, 4:1 gearbox, 9x6 MA prop is only 2.59 Amps... Is that too much for a Speed 280? Someone who doesn't know that motors have limits wouldn't know. The 280s are burning out because the 8 cells are making them spin too fast.

8 cells, Speed 300, 4:1 gearbox, 9x6 MA prop is 13.67 Amps... Is that too much for a Speed 300? Sounds great to someone with no knowledge of electric motors. Too bad it's a meltdown waiting to happen.

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