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_Del_ said:Sundog said:jsport said:Those outboard props nake it non starter for military in -extremis ops.
I don't see why those would be any worse than the tail pusher in the Sikorsky designs, as I'm sure they would be disengaged on the ground.
Their configuration needs at least one prop turning for anti-torque. Even if you shut it down on the ground, it would require time to spin down. And it would require time to get both rotors and propulsors back up to speed.
Sikorski's fan is on a clutch, and they can disengage it in flight in descent. Just as importantly, it also isn't sitting right outside the cabin.
This.