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Old Feb 28, 2005, 07:30 PM
I'd Rather be Flying
United Kingdom, Milton Keynes
Joined Feb 2005
144 Posts
Help!
kc spreadsheet power question

does anybody know how the mechanical power delivered by the rotor in the spreadsheet eg using tango 45-07 10S2P pack is calculated
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Old Feb 28, 2005, 11:49 PM
Destroyer of G-10
askman's Avatar
United States, OR
Joined Jul 2004
10,085 Posts
all the equations are available on the spreadsheet.
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Old Mar 01, 2005, 02:56 PM
I'd Rather be Flying
United Kingdom, Milton Keynes
Joined Feb 2005
144 Posts
Quote:
Originally Posted by askman
all the equations are available on the spreadsheet.
thanks for answering my question, have seen the formula's but my math is not too good when using formula's. I know it is a simple case of ohm's law so am I right in saying to calculate the maximum power available is the batt pack power plus motor power in watts. ie batt capacity x voltage plus motor power in watts together ? or am I going down the wrong road.

Also how do I calculate hover, average and max power. I have been working on the basis that 750W is approx 1H.P in i.c terms and taking it from there.

Any feedback would be much appreciated

Thanks
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Old Mar 01, 2005, 03:10 PM
Destroyer of G-10
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United States, OR
Joined Jul 2004
10,085 Posts
in KC's spreasheet, average/hover/peak power is defined in the sheet as watt/lb. so, if you want 100 watt/lb setup, you use 100*weight(in lb)/efficientcy to find power needed. the complicated part is due to resistance of different component(motor/battery/etc) that will affect your efficientcy.

I use about 80% efficientcy if it is not critical, but KC's sheet calculates it based on available motor and battery data. Lets say you have 5lb heli(ready to fly) and you want 100 watt/lb power. this means you need to be able to provide 5*100/.8= 625watt. using 6S setup(which give about 20v), you will need 31amp current draw.
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Old Mar 01, 2005, 03:24 PM
I'd Rather be Flying
United Kingdom, Milton Keynes
Joined Feb 2005
144 Posts
Thanks Askman, I will have a play and see if it makes sensce now
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