We've got 7 nights coming up in late March, so the timing is perfect - has anyone identified the promo code required on the registration page?

Perhaps I should have been less specific than "engine" failure as each rotor appears to have it's own engine - the point applies more to circumstances where all drive to the rotor array stops, for example battery depletion or failure.

I'm intrigued by how these aircraft deal with engine failure - by comparison to helicopters which depend on rotor disc inertia to flare at touchdown during auto-rotation. I can't imagine these small rotors have enough mass to store the same energy as a helicopter rotor.