Mike Morcher Posted January 21, 2011 Share Posted January 21, 2011 My friend has a model of 40” span mid wing Bell Hop Weight 25 oz 800 mah 3s 25c battery Prop 8 x 4 8 amp ESC >> Motor in the model is not known, but does not have enough power So what should he get to replace it ?? Many thanks Mike. Quote Link to comment Share on other sites More sharing options...
Mike Morcher Posted January 21, 2011 Author Share Posted January 21, 2011 Sorry thats what motor to replace ? Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted January 21, 2011 Share Posted January 21, 2011 Is it brushed or brushless? You'll be very limited with such a small esc Edited By Steve W-O on 21/01/2011 12:28:20 Quote Link to comment Share on other sites More sharing options...
Simon B Posted January 21, 2011 Share Posted January 21, 2011 i'd replace the motor with a 200w motor and a 25A ESC. Something like this would do the job:http://www.brchobbies.co.uk/?page=shop&action=additem&item=61 Quote Link to comment Share on other sites More sharing options...
Simon B Posted January 21, 2011 Share Posted January 21, 2011 Only thing i'd say is that the kV rating is a little high. Quote Link to comment Share on other sites More sharing options...
Simon B Posted January 21, 2011 Share Posted January 21, 2011 Try this lower kv motor: http://www.giantcod.co.uk/xyh3530-1100kv-brushless-outrunner-p-402740.htmland this ESC: http://www.giantcod.co.uk/hobbywing-guard-brushless-speed-controller-p-402475.html Lower KV and ideal power i'd reckon. Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted January 21, 2011 Share Posted January 21, 2011 Posted by Simon B on 21/01/2011 12:46:58:Try this lower kv motor: http://www.giantcod.co.uk/xyh3530-1100kv-brushless-outrunner-p-402740.htmland this ESC: http://www.giantcod.co.uk/hobbywing-guard-brushless-speed-controller-p-402475.html Lower KV and ideal power i'd reckon. With an 800mAh battery?Will probably overheat the battery, and will have a flight time of 2-3 minutes.I got the impression he just wants to find a motor to use with the existing parts. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 21, 2011 Share Posted January 21, 2011 Yes, but its a 25oz plane hence he needs about 130w min and preferably 160w+, on a 3s battery thats around 15 amps so as you say a 800 mah battery even a 25c oneis not really sufficient. But the whole power train is probably too weak for that size and weight of plane. A minimum1300 mah min battery would probably be required. Running the exisitng battery at 10c is only going to give 80w or so and on that plane that would be 50w per pound, well below what is considered reasonable (100w/lb) for good performance. Quote Link to comment Share on other sites More sharing options...
Simon B Posted January 21, 2011 Share Posted January 21, 2011 Indeed, Frank's on the money. The weight of the plane will require a complete upgrade in power train Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted January 21, 2011 Share Posted January 21, 2011 I think it will fly OK on 100W, assuming he doesn't want high performance.Unfortunately, we don't know why it is lacking in power. Won't it fly, or wont it perform?.I think more info is needed before he goes out and replaces everything.we don't even know what type of motor it has! Quote Link to comment Share on other sites More sharing options...
Simon B Posted January 21, 2011 Share Posted January 21, 2011 I flew a similar sized model on a 800mah lipo and 140w motor, but I think the ESC will definitely need upgrading unless the plane is constantly to be flown at the power limits constantly. On 11.1v assuming the battery is giving full voltage out (unlikely for any length of time, you'd need at least 9A to get 100w out. Quote Link to comment Share on other sites More sharing options...
Simon B Posted January 21, 2011 Share Posted January 21, 2011 P.S sorry if I sound unduly negative. It's not my intention, but even for pottering about I think an upgrade would be advisable personally. Quote Link to comment Share on other sites More sharing options...
John Cole Posted January 21, 2011 Share Posted January 21, 2011 Might be cheaper to replace the plane! Quote Link to comment Share on other sites More sharing options...
Simon B Posted January 21, 2011 Share Posted January 21, 2011 I dunno. £20 will get a new ESC and motor. A larger cap battery from Giant Cod would be about another tenner too. Can't think of many good planes for that cash! Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted January 21, 2011 Share Posted January 21, 2011 Posted by Simon B on 21/01/2011 14:25:01:I flew a similar sized model on a 800mah lipo and 140w motor, but I think the ESC will definitely need upgrading unless the plane is constantly to be flown at the power limits constantly. On 11.1v assuming the battery is giving full voltage out (unlikely for any length of time, you'd need at least 9A to get 100w out.I agree, but at 10V and 10A the battery is at half its rating at 100W.On your next post, I agree on the ESC, that was my first comment, the ESC is gong to be the limiting factor Quote Link to comment Share on other sites More sharing options...
Mike Morcher Posted January 21, 2011 Author Share Posted January 21, 2011 Well thanks Guys you have helped, got us looking in the right place will let you know how we get on. All the best Mike. Quote Link to comment Share on other sites More sharing options...
Anthony Flack Posted January 25, 2011 Share Posted January 25, 2011 Hi All, I hope I am in the right place. I have a couple of problems that I hope someone can help with. I have recently managed to get my hands on a second hand J Perkins Electric Sopwith Camel. It's in lovely condition but I did not get the manual. Therefore, can anybody help me with the following: What motor and battery should I be using and where is the Cof G located? Regards Tony Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted January 25, 2011 Share Posted January 25, 2011 Anthony - you're best starting anew thread for that really Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 25, 2011 Share Posted January 25, 2011 Mike This free program, www.drivecalc.de is a good starting point for checking on various motor/prop/battery combinations. Quote Link to comment Share on other sites More sharing options...
Mike Morcher Posted January 25, 2011 Author Share Posted January 25, 2011 Thanks Frank Mike Quote Link to comment Share on other sites More sharing options...
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