[EricH]

Please start by reading the rules.

Safety: I'd personally regard this as a major safety violation. You're throwing something of significant mass (15 lbs) up something like 10 feet vertically. If you miss and hit a ref, you can expect not to ever be allowed to use it again--assuming you pass inspection in the first place.
Legality: There is a deployment line on the poles. Contact above that by the robots is prohibited (minibots excepted, but they must be free of the robot--See Game Section 3.1.5 for details). Also <G20> applies.

I don't see any rule that the minibot must use a motor--Game Section 4.3.14--but you'll need to latch on somehow.