No, it uses a single prop and some static parts to create the contra-rotating force. The rest is handled by the vanes.
No, it uses a single prop and some static parts to create the contra-rotating force. The rest is handled by the vanes.
Trust vectoring. It is a single propeller and four control vanes.
Check out the duct fan UAV principle, it increases the efficiency of a propeller by 30%, more than enough to ‘pay’ for the added weight of the duct itself.