I don't see any big problem with the E motor on a trainer. I saw a rocket go awry last weekend at a sanctioned rocket launch. It only did $3,000 damage to the truck. Since it was a sanctioned/insured event the rocketeer was only responsible for the $1,000 deductable. Now - the fully AMA legal heli that was mowing dandilions at our local field today (and later mowing dirt.) - That scares me.

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typo