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Top Flite B25 glow to electric conv. question

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Old 10-25-2014, 03:41 PM
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rzingsheim
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Default Top Flite B25 glow to electric conv. question

Has anyone done a conversion of the discontinued Top Flite B25? It had 2 OS50 2 stroke glow engines in it but I want to go electric. I'd like to run 3 blade props in the 12-14" diameter. I'm looking for specific motors, speed controllers, and battery voltage and MaH (one for each motor) that would give me good scale performance ( and maybe a little to spare) with about 10 min. flight times. Plane is expected to weigh about 20 to 21 lbs. with a wing loading of about 46oz/sq. ft. I've tried to use E-CALC but I'm not sure I'm doing it right with two motors, speed controls, and batteries. Any help would be much appreciated.
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Old 02-07-2015, 07:10 PM
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zing: Let me look at this for awhile. The challenge here is to get enough airspeed and thrust.
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Old 02-07-2015, 07:26 PM
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OK, here we go. I put this together for use with an 80" F7F Tigercat. No 3 bladers, tho, as you really want to go counter rotating motors on this to cancel out the torque effects on the handling. Also, re fiddle the motor mounts to get them on the same axis as the fuse. Topflite put in outthrust in case a glow engine flamed out.

Single 6S 8000 30C pack
Phoenix Edge 50s
Turnigy G110-295
APC Props:
LP16014 (16x14 tractor)
LP16014P (16x14 pusher)
This is good for 70mph and 340 oz of thrust, with flight time over 11 mins, current 36 A per motor.

ecalc gets confusing when you punch in 2 motors on one battery: it still shows individual motor current and thrust, etc.
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