maurice northcott Posted March 18, 2017 Share Posted March 18, 2017 Hi All Anybody got direct experience of putting electric motor in a model of the following size & type please? If so, could you please suggest a power train for the following? Size 80-inch span and length, weight about 20lbs. Wing area: 7.2sq.ft. Wing loading (calculated) approx. 2.78lbs/sq ft. Type: WW2 fighter of good performance. Many thanks in advance, maurice Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted March 18, 2017 Share Posted March 18, 2017 Hi Maurice If you are in the UK, are you a member of the LMA, as they have a schedule and the expertise for such a build Quote Link to comment Share on other sites More sharing options...
John Laverick Posted March 18, 2017 Share Posted March 18, 2017 That's a lot of weight for an 80 inch plane Maurice! Has it got a full load of bombs on? I've put a motor in a 88 inch Mick Reeves Hurricane, all up weight 13lbs, pulling 2000 watts. I think your gonna need one of the Turnigy Aerodrive 6364/6374 motors? They pull over 2000 watts on a 12 s 19 or 20 inch prop? On a warbird, I like over 100 watts per pound. Hobbyking sell em. Quote Link to comment Share on other sites More sharing options...
Dwain Dibley. Posted March 18, 2017 Share Posted March 18, 2017 I was just about to say at least 150 W/lb, but john beat me to it, that would be 3 Kw, min... What is the model ? D.D. Quote Link to comment Share on other sites More sharing options...
cymaz Posted March 18, 2017 Share Posted March 18, 2017 The rules are if your projected build weight will be over 20kg, the build needs to be inspected and registered. I have an unflown airframe at 19kg. I thought it wise for some expertise and the LMA where only too glad to look over the airframe and make recommendations. Better safe than sorry. Quote Link to comment Share on other sites More sharing options...
Pete B Posted March 18, 2017 Share Posted March 18, 2017 I know the £ is heading towards parity with the €, cymaz, but I've heard nothing yet about 20lb aiming to reaching parity with 20kg.... Pete Quote Link to comment Share on other sites More sharing options...
maurice northcott Posted March 18, 2017 Author Share Posted March 18, 2017 Thanks Pete B I think even I would have trouble making an 80-inch 190 coming in at 20kg finished weight maurice Edited By maurice northcott on 18/03/2017 15:26:32 Quote Link to comment Share on other sites More sharing options...
cymaz Posted March 18, 2017 Share Posted March 18, 2017 Posted by Denis Watkins on 18/03/2017 13:42:02: Hi Maurice If you are in the UK, are you a member of the LMA, as they have a schedule and the expertise for such a build I thought that D.W. Might have got the lbs and kg muddled. Apologies to Denis if I did him wrong. Edited By cymaz on 18/03/2017 15:28:08 Quote Link to comment Share on other sites More sharing options...
John Laverick Posted March 18, 2017 Share Posted March 18, 2017 You might need some decent retracts on 20kgs Maurice?? Quote Link to comment Share on other sites More sharing options...
maurice northcott Posted March 18, 2017 Author Share Posted March 18, 2017 Hi Cymaz et al I dont know where 20kg came from. My original post stated "... weight about 20lbs." But I am more interested in a suggested power train...... maurice Edited By maurice northcott on 18/03/2017 15:35:08 Quote Link to comment Share on other sites More sharing options...
Dwain Dibley. Posted March 18, 2017 Share Posted March 18, 2017 Can you tell us what the model is Mo ?? D.D. Quote Link to comment Share on other sites More sharing options...
maurice northcott Posted March 18, 2017 Author Share Posted March 18, 2017 Dwain, its a 190D. Thanks mo Quote Link to comment Share on other sites More sharing options...
Dwain Dibley. Posted March 18, 2017 Share Posted March 18, 2017 Have a look at THIS. Its a similarly weighty model, it will give you some idea, with all the relevant numbers. You can then adapt the set up for your model or even Call George for some advice. It's what I do normally. Hope that is of some help matey. D.D. Quote Link to comment Share on other sites More sharing options...
Dwain Dibley. Posted March 18, 2017 Share Posted March 18, 2017 It's not far off the mark at 2.7Kw, 140 odd W/lb or thereabouts. D.D. Quote Link to comment Share on other sites More sharing options...
maurice northcott Posted March 18, 2017 Author Share Posted March 18, 2017 Thats great Dwain, just the type of thing I was after. Cheers matey.. Quote Link to comment Share on other sites More sharing options...
Dwain Dibley. Posted March 18, 2017 Share Posted March 18, 2017 Happy Campers... Quote Link to comment Share on other sites More sharing options...
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