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Old Jun 24, 2011, 02:49 PM
vienquach is offline
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Chicago, IL
Joined Nov 2009
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If you could keep the weight below 5 lbs, ~ 200g motor + 4s-4000 lipo + 60A ESC would be plenty. Many people like to run small prop fast, but larger diameter prop (pay attention to ground clearance) would give you much higher thrust efficiency --> more thrust for the same power consumption (lower kv motor). So I prefer 12" or 13" prop for this plane with 700 - 800kv motor.

Due to weight differences between the nitro gas and the brushless motor, CG will be affected.
a) Move the battery as close to the firewall as possible.
b) Use a larger motor
c) Use a larger battery pack for longer flight time.

This is what I have in mind:
_ Motor: Infinite A3025-770 kv ($40)
_ ESC: Hobbywing Pentium 60A ($40) or Mystery 60A - 80A ($20-$30)
_ Battery: Blue Lipo or Sky Lipo 4s, 4000-5000mAh, 20-30C ($30 - $40)
_ Prop: APC 12 x 8 or 13 x 6.5 on 4s would give you around 600w.

There you go, a powerful electric system for around $100.00. Depend on how you fly, flight time would be around 15 - 25 mins per charge.
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Last edited by vienquach; Jun 24, 2011 at 05:47 PM.
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