RCU Forums - Something Wrong, I think!!

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Matt14x

02-09-2006 09:48 PM

Something Wrong, I think!!

Should a larger size motor ( himax 2812-1080 kv ) draw more amps. than a smaller mtr. , using the same size prop. ( apc 10X3.7 ) I thought it should be the other way around ! !

Matt

Matt14x

02-09-2006 09:52 PM

RE: Something Wrong, I think!!

OPPS

The smaller mtr. is a himax 2808-1160.

Matt

lwatson

02-10-2006 01:02 PM

RE: Something Wrong, I think!!

Its all about the thrust per amps. One expects a larger motor to be able to draw more amps and convert this into thrust. It is probably spinning the prop faster.

Matt14x

02-10-2006 04:08 PM

RE: Something Wrong, I think!!

LWATSON

yOU ARE 100% CORRECT.

After a lot of bench testing I found the smaller mtr. pulling 11.6 amps. @ 8100 rpm and the big mtr. pulling 13.4 amps. at 9100 rpm.

I should have knouned that !

Another mystery:
An apc 9X3.8 pulls 12.6 amps at 8000 rpm, 10.9 vdc, While a apc 9X4.7 pulls 11.6 amps. at 8100 rpm, 11.1 vdc.

THANKS LWATSON

Matt

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