Does the plane have to be an external propeller plane, or can it be a duct fan UAV?
Ducted fans are also legal if they use a commercial fan assembly. • Question: In terms of propellers. Can they be any kind of Gas engine propeller if we wish? Or do they have to be Electric motor propellers? And if we can only use electric motor propellers, can we cut them? Basically, if we wish to, can we use any kind of non-electric motor propellers if they are commercially available? Answer: Any commercial propeller for either gas or electric models may be used. Props may be cut to reduce their diameter but the blades may not be reduced in thickness (such as by sanding the airfoils to a new profile) or in chord (such as by trimming the trailing edges). • Question: What constitutes “over the counter” batteries, and does this apply to the battery pack or to the individual cells? Answer: The “Over the Counter” refers to the individual cells. This is a change from the rule for the 1996/97 contest year. • Question: Could the electricians in the Electronics Shop at our university build th
