Cliff 1959 Posted November 15, 2021 Share Posted November 15, 2021 Has anyone converted one of the KeilKraft or Guillows (or any other make) or stick and tissue jets to electric EDF, I can't find any info of any examples? It could be a cool project! Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted November 15, 2021 Share Posted November 15, 2021 Cliff 1959 I think you will find its not the stick and tissue that is the major problem but making suitable inlet and exhaust ducts from keeping to an appropriate weight. The EDF and battery will be relatively heavy and with limited thrust. Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted November 15, 2021 Share Posted November 15, 2021 (edited) This winter I will be making enlarged versions of kk ff kit models to c/l Cox powered 049, and X2 scale for RC, IC and electric propulsion. Can't wait to compare IC versus electric power wieghts Suspect IC is gunna win hands down on all respects, but I am completely new to electric power, so some wieght loss ( £'s probably ) to achieve. Guilows chipmonk, kk Lysander, kk Sopwith, kk Mustang, kk stuka, guillows spit and a larger guillows thunderbolt, for starters... Must go and ask foreman about the scrap foam on the building site, they will only burn it. Sorry, no jets but try vintage model company, the comet X2 scale would be good slope soarer me thinks... Edited November 15, 2021 by Rich Griff Quote Link to comment Share on other sites More sharing options...
Don Fry Posted November 15, 2021 Share Posted November 15, 2021 Seems strange, but as a rule of thumb, converting from ic to electric, and vicariously versa does not effect AUW if correctly done. Quote Link to comment Share on other sites More sharing options...
Cliff 1959 Posted November 15, 2021 Author Share Posted November 15, 2021 Looking on Banggood I see a 2s edf unit weighing 21.8g and 30mm diameter with a thrust of over 7ozs so maybe it's possible, given a very light airframe. QF1611 14000KV Vlotage: 7.4V Amps(A): 19.3 Watts(W): 142.82 Thrust(g): 215 Thrust(oz): 7.58 Efficiency(g/W): 1.51 Efficiency(oz/W): 0.05 Throttle: 100% ESC: 20A Quote Link to comment Share on other sites More sharing options...
alan p Posted November 15, 2021 Share Posted November 15, 2021 12" jetex free flight modified to 50mm edf 3s elevator and ailerons 32" span sheeted 1/16 balsa . Exhaust 85% of swept area Flies well scale speed. Quote Link to comment Share on other sites More sharing options...
Cliff 1959 Posted November 15, 2021 Author Share Posted November 15, 2021 That's nice Alan, I hadn't thought of scaling up a plan, how about the Guillow's Mig 15, here's the Outerzone plan, maybe x2? https://outerzone.co.uk/plan_details.asp?ID=11610 Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted November 15, 2021 Share Posted November 15, 2021 It can indeed be done. The original plan for a Jetex Vampire. The modified airframe to house a 40 mm EDF before tissue covering. Much of the stiffening was required as with the EDF, battery and servos it ended up weighing just over twice as much as the original Jetex version. It only just about flew and because of its landing speed it was pretty delicate. A true scale DH Venom at the same size and with the same EDF but built entirely from foam flies a great deal better and unlike tissue it does not go slack in damp conditions.? Quote Link to comment Share on other sites More sharing options...
alan p Posted November 16, 2021 Share Posted November 16, 2021 Hi Cliff The scaling was done to suit the fan diameter size to ensure adequate air flow, ie if the inlet at the nose was multiplied to suit, the rest followed in the same ratio. It turned out about 2.66 for the HE. Quote Link to comment Share on other sites More sharing options...
brokenenglish Posted March 15, 2022 Share Posted March 15, 2022 Sorry, I only just found this. There's an obvious answer to the OP. While converting the small KK and Guillows kits might be a challenge without scaling up, Phil Smith's sticks and tissue Veron kits would be great (being a bit larger). The Veron La17, Sabre and FD2 would be great EDF fliers. I'm sure it must have been done already. Quote Link to comment Share on other sites More sharing options...
Cliff 1959 Posted March 15, 2022 Author Share Posted March 15, 2022 Thanks, I'll take a look, I haven'tstarted the project yet, cheers Quote Link to comment Share on other sites More sharing options...
brokenenglish Posted March 15, 2022 Share Posted March 15, 2022 I just checked. The La17, Sabre and a "Deltaceptor" are available on Outerzone. The FD2 is missing (for the moment!). The advantage with these Phil Smith designs is that, apart from being well designed and good fliers, all the ducting/motor mount, etc. is already designed in. Quote Link to comment Share on other sites More sharing options...
Cliff 1959 Posted March 15, 2022 Author Share Posted March 15, 2022 The 34in span Sabre looks good ? Quote Link to comment Share on other sites More sharing options...
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