Vivian Burgess Posted July 12, 2015 Share Posted July 12, 2015 Has anybody built and flown the seagull ercoupe? I have put in a 5000w electric motor in mine, but not flown it yet. had tried a 2700 w but not enough puff. the model not me! Quote Link to comment Share on other sites More sharing options...
David Hardaker Posted July 12, 2015 Share Posted July 12, 2015 Vivian, Don't you really mean 500 watt ?? ( it is only a model, isn't it ?) d Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted July 12, 2015 Share Posted July 12, 2015 Posted by David Hardaker on 12/07/2015 19:42:46: Vivian, Don't you really mean 500 watt ?? ( it is only a model, isn't it ?) d I doubt it, that plane is rated for a 35-45cc Engine, so you are looking at least 3000 Watts Quote Link to comment Share on other sites More sharing options...
Reno Racer Posted July 12, 2015 Share Posted July 12, 2015 Dave, beat me to it. 35-45cc petrol and 15+lbs . I expect with 5kw it will shift, 3kw would be 200watts/lb. Quote Link to comment Share on other sites More sharing options...
David Hardaker Posted July 12, 2015 Share Posted July 12, 2015 Some model I stand corrected !! Quote Link to comment Share on other sites More sharing options...
Reno Racer Posted July 12, 2015 Share Posted July 12, 2015 Vivian, was your motor propped correctly and did you measure 2700watts. I thought that at nearly 200 watts/lb, that would have been more than sufficient. Theoretically, it should fly scale at 1500watts. Edited By Reno Racer on 12/07/2015 20:02:36 Quote Link to comment Share on other sites More sharing options...
Vivian Burgess Posted July 13, 2015 Author Share Posted July 13, 2015 thanks boys, first I used a turnigy g160 motor, = 2700w on 10 cells. prop was a 19x10 if I remember. not enough take off speed. now I have a 5000w motor in it, not flown it yet, 12 cells and a 24x8 prop. Quote Link to comment Share on other sites More sharing options...
Reno Racer Posted July 13, 2015 Share Posted July 13, 2015 I reckon, you have had problems with propellor pitch speed and stall speed been too close, not giving enough thrust to get you airborne. Ironically, a 16x10 on 10s with your setup should produce better results, according to ecalc. This still gives nearly 150 watts/lb and your amps pull is much lower. Quote Link to comment Share on other sites More sharing options...
Reno Racer Posted July 13, 2015 Share Posted July 13, 2015 Here you go Quote Link to comment Share on other sites More sharing options...
Vivian Burgess Posted July 13, 2015 Author Share Posted July 13, 2015 thanks reno racer, I did try with a smaller prop but not a lot of difference. fitting a larger motor does away with a load of lead up front. I can always throttle back ,I like to fly on half power or less. Quote Link to comment Share on other sites More sharing options...
Steve Burke Posted March 14, 2016 Share Posted March 14, 2016 Hi Vivian, Did you ever get your electric Ercoupe sorted ? I'm thinking about converting one myself and wondered how you got on with the bigger motor (I presume a Rotomax 50?) All the ecalc numbers say that your G160 should have been enough. I've been reading on a German forum (via Google Translate) about another chap with the same problem. He eventually put it down to a soft and/or short (confusing translation) nose leg so that it compressed too much during the attempted takeoff and caused a negative angle of attack. Anyway, just wondered if you sorted it, save me falling into the same trap! Quote Link to comment Share on other sites More sharing options...
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