Trevor Grace 1 Posted February 9, 2012 Share Posted February 9, 2012 i am building a aerobatic funfly of about 60" wingspan and 680square inch area. allup weight around 9oz/sq.ft. i want to fly it on a 2s @25c and 13 to 14"prop Can anyone suggest a brushles motor to fit the above spec. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted February 9, 2012 Share Posted February 9, 2012 So about 2.6 lbs all up weight?, if so for a fun fly you'd need to aim for around 125w per pound or 325 watts, on a 2s battery that equates to around 45 amps. I think you would be better off with a lower Kv motor and running 3 cells which would bring the max amps down to around 30 amps which opens up a much larger motor choice and you would be able to use the popular 2200 mah 3s batteries which are available at good prices. Running a few options through drivecalc (www.drivecalc.de) would give you some ideas, I'd start looking at motors in the 800-1000 kv range. Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted February 9, 2012 Share Posted February 9, 2012 I agree with Frank.....2S is way too small.....3S battery around 2200 - 3000mAh....40A ESC & a 40A motor with a kv around 800-1000 as Frank says.....should be good for 3-400watts on a 13" prop.... Quote Link to comment Share on other sites More sharing options...
Trevor Grace 1 Posted February 9, 2012 Author Share Posted February 9, 2012 thanks gents, ijust thought 2s would keep the weight down and a slower stall speed Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted February 9, 2012 Share Posted February 9, 2012 Yes but at 45 amps you would need a larger mah battery to get a decent flight time, the motor would have to be larger (its the amps what kills em!) . Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted February 9, 2012 Share Posted February 9, 2012 Swings & roundabouts Trevor.......swings & roundabouts.... Quote Link to comment Share on other sites More sharing options...
Trevor Grace 1 Posted February 9, 2012 Author Share Posted February 9, 2012 point taken, back to motorcalc.many thanks for the help Quote Link to comment Share on other sites More sharing options...
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