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Old 01-28-2015, 08:41 AM
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Bax
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For electric conversion, this should work nicely:

GPMG4620 RIMFIRE .15 35-36-1200 OUTRUNR

The Butterfly was intended for a .10-.20-size glow engine, so a .15-size should fill the bill. Just keep the airframe weight down as much as possible.