Alan Brock Posted July 10, 2007 Share Posted July 10, 2007 I have nearly finished a 70" Bristol Beaufighter designed for two 25 to 35 2-strokes. At the last minute I thought it might be a good idea to fit electric motors instead, due to problems of getting engines to fit inside the moulded cowlings as there is little space and fuel spillage on paintwork etc. I would also like to fit realistically scaled 3 bladed props.Can anyone suggest what motors and props etc to fit of equivalent power. I expect all up weight to be about 5.5kgs. Quote Link to comment Share on other sites More sharing options...
nasa_steve Posted July 10, 2007 Share Posted July 10, 2007 hi alan go on the website here www.modelmotors.cz look throught the motors and the info is at the bottom of the page as to what they are equivilant toregards. i would start somewhere around the 28/20- series onwardsnasa Quote Link to comment Share on other sites More sharing options...
Robert Leadbeater Posted July 12, 2007 Share Posted July 12, 2007 i would aim for around 550 watts so 275 watts either side. i would use the brc hobbies 300 watt combo deal the 1400kv one coupled to 2 3 cell 2200 mah lipos or 2 8 cell nimhs. Quote Link to comment Share on other sites More sharing options...
Alan Brock Posted July 16, 2007 Author Share Posted July 16, 2007 Thanks for the info.I have revised the AUW of the plane by actually weighing all the assemblies and with the motors and batteries I expect it to be about 3.4/3.5kg, much less than originally thought.I have been looking at the AXI motors on the ModelMotors website, unfortunately all model weights seem to be related to single engine designs. Would 2 engines suitable for 1.7kg equal 1 engine suitable for 3.4kg or is it more complicated than that?The AXI 2820 series is for 600-700 size planes, what does that mean?A quick calculation from the formula on their website suggests a total power of about 700-900W. So would a pair of 300W motors be enough?Cost isn't really an issue, but I would like to get it right first time. Quote Link to comment Share on other sites More sharing options...
nasa_steve Posted July 16, 2007 Share Posted July 16, 2007 hi alan firstly if your model weighs 3.4kg-3.5kg would it not be a good idea to give yourself a little leeway and aim at motors capable of lifting lets say 4.5kg i'm a great believer of the school of "you can never have too much power". if a model is designed for 40-60 power would you not fit a 60??? sure it might fly on a 40 but it might only just fly on a 40.the watt's is your power rating in basic terms 748w is 1 hp so in answer to will it fly on 2 300w motors i would'nt have thought so if it says 700-900w thats what you need not 600w which is what you are asking to fly it on are you not?? the "600-700 size planes" refer's to the old can type motors about .25 size hope that helpsregardssteve Quote Link to comment Share on other sites More sharing options...
Xander Caswell Posted September 2, 2008 Share Posted September 2, 2008 just a quick question, what kit is the beaufighter??? i have been looking for one and the only one i have been able to find is the alfa models one Quote Link to comment Share on other sites More sharing options...
Alan Brock Posted September 2, 2008 Author Share Posted September 2, 2008 The Beaufighter isn't a kit, it was built up from plans bought from traplet. The plan code is MW2605. Quote Link to comment Share on other sites More sharing options...
Xander Caswell Posted September 2, 2008 Share Posted September 2, 2008 cool thanks Quote Link to comment Share on other sites More sharing options...
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