Stephen Jones Posted May 25, 2015 Share Posted May 25, 2015 Hi , what size model would a typical 70mm Electric ducted fan be capable of flying. I believe they have motors of around 600 watts , but would they be capable of lifting a 6 lbs model ~? Wing span , Model weight ? cheers. Steve. Quote Link to comment Share on other sites More sharing options...
Bill_B Posted May 25, 2015 Share Posted May 25, 2015 Steve, you just need to do a Google search for 70mm EDF jets and you'll see the typical size that a 70mm fan can fly. 6Lbs (2.7Kg) is heck of a strech and I would say that it might take up a glider of that weight, but I'm not 100% sure as EDFs are infamously inefficient. With EDF the key word is lightness and the most powerful of the famed Wemotec 70mm units only produces 3.9Lbs force with a 6s battery. More thrust than that and you need to step up to 90mm and 8-12s LiPo. As a rough guide perhaps, I have two Wemotec powered 70mm jets on 4s and the heaviest is 1.3Kg and it flies in a very sedate manner. The other is just under 1Kg and its speed is in another league, much more jet like. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 25, 2015 Share Posted May 25, 2015 Stephen There are 70mm EDFs and there are 70mm EDFs! A look through the EDFs on say the Hobby King site will give you an idea of the sort of range. For instance the Dr Mad 70mm is rated at 1900W on a 6s and delivers 2kg (4.4 lbs )thrust. It would have no difficulty with a 6lb plane. Its a bit chicken and egg. Maybe find a plane that you like and see what EDF/battery combination is recommended. Quote Link to comment Share on other sites More sharing options...
Bill_B Posted May 25, 2015 Share Posted May 25, 2015 I don't want to put a damper on things, but Dr. Mad Thrust claims can sometimes be a bit hopeful, whereas Wemotec are guaranteed real world figures. Quote Link to comment Share on other sites More sharing options...
ben goodfellow 1 Posted May 25, 2015 Share Posted May 25, 2015 THE het f18 in my pics ,had a wemotec mf 480.. a turnigy 28mm 3200 kvmotor and i measured just under the 800 watt mark on 4s . the plane if i remember correct was around 2kg and it flew very well Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 25, 2015 Author Share Posted May 25, 2015 Thanks chaps , Now i have an idea at what size and weight , to work around . 50 inch at no more than 4.5 lbs flying weight . Should be possible . Cheers Steve. Quote Link to comment Share on other sites More sharing options...
Thomas Barwick Posted May 26, 2015 Share Posted May 26, 2015 The dr mad thrust fans are very good units, but the thrust numbers are taken outside of any airframe so the thrust will be higher. I have always experienced at least a 20% loss in thrust when installed in the airframe, so something to be aware of. Quote Link to comment Share on other sites More sharing options...
sevan vecidyan Posted June 30, 2015 Share Posted June 30, 2015 Nice sounding fan, depending on the type of plane, airframe ducts and exhaust. I’ve tried it on a HKs L2855=2100kv motor, 6s battery, and it holds 2kg easily. Regards, Sirma http://blog.7pcb.com Edited By sevan vecidyan on 30/06/2015 21:42:50 Quote Link to comment Share on other sites More sharing options...
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