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Old Jul 05, 2012, 08:58 PM
Gilbert AZ
United States, AZ, Gilbert
Joined May 2012
1,617 Posts
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Headsup rc firepower 60

How do I determine what size prop I could use for 6s and still get 1200Watts WOT?

http://www.headsuprc.com/servlet/the...h-06%29/Detail

There is no prop data provided with this motor.

Thanks.
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Old Jul 05, 2012, 11:15 PM
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R Zielinski's Avatar
USA, NH, Madbury
Joined Dec 2007
189 Posts
Use a calculator and trial and error. I recommend WebOcalc. Free, easy to use, tutorial on line. Do a search.

Part of the reason you may be having trouble is that you're starting with the wrong question. The first question is: What kind of plane, all up weight and how will you fly it? That determines the prop needed, which then determines the motor and voltage needed. But to answer your question:

On 6s, you're limited by the fast RPM. Need smaller diameter props:
12X8 gives 119 Oz thrust @ 80.2 MPH pitch speed at 1123 Watts in (54 amp).

13 X 6.5 gives 122 oz thrust @ 63.5 MPH @ 1209 Watts in (56 amp).

12X6 is more reasonable, gives 97.7 oz thrust @ 60.9 MPH @ 929 Watts in (43 amp)

This would be appropriate for a fast aerobatic plane around 80-100 oz all up weight. However, a much heavier slow sport plane like a cub could use this motor at 4 or 5S, with a larger diameter prop. If you're married to 6S, the examples above are about it for APC electric props.

Hope this helps.
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Old Jul 05, 2012, 11:23 PM
Gilbert AZ
United States, AZ, Gilbert
Joined May 2012
1,617 Posts
It does help and thanks for your reply. Yes its for a slow sport scale airplane. I want to swing larger diameter props for more thrust over speed so 5s might be Ideal. I will check out the calculator.
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Old Jul 05, 2012, 11:43 PM
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R Zielinski's Avatar
USA, NH, Madbury
Joined Dec 2007
189 Posts
Ahh, that will work better.

For 5S: 14 X 7 APC TE gives 122 oz thrust at 62 amps.
For 4S: 16 X8 APC TE gives 132.7 oz thrust at 77 amps. Spend less on batteries, more on ESC but this will haul a big plane around and not burn up that motor. (Unless you fly WOT all the time without good air flow, that is. Use a watt meter to test out these calculated estimates before you risk your equipment. Jeff at Heads UP is very good, but even he might overestimate motor specs occasionally. The "3 watts per gram" rule says that motor will overheat above 1000 watts, so the 1250 advertised is short bursts only).
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Old Jul 06, 2012, 08:52 AM
Gilbert AZ
United States, AZ, Gilbert
Joined May 2012
1,617 Posts
I tried out WebOcalc last night. What a Great Tool.

Thanks a tonage.
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