posted on Aug, 3 2006 @ 10:56 PM
Originally posted by evo1981
I was just searching for images and this stuck out as one I don't THINK i've seen before
It looks as if the rotors can be used horizontally for chopper like flight and then possibly rotated to vertical for plane like flight!
I can't find any more info on it just hoping ATS'ers can shed some light on the subject
If this has been covered before sorry mod's!
[edit on 8/3/2006 by evo1981]
Bell did a system like this, albeit without the enclosed fans, for their original 'Pointer' UAV which looked a lot like a miniature tiltrotor. The
problem is of course getting enough blade speed to push enough mass flow through the small duct to gain effective lift without creating huge erosion
and noise/vibration levels.
Often, for propulsive efficiencies, it's better to go with a given sized core engine to spin a quite large fan in a fixed duct and then use vectoring
paddles or RCS type shunts to enable the transition to forward flight on core thrust alone.
The one big problem then being that you tend to eat a lot of fuselage volume with 'fore and aft' fan compartmentalization problems, leaving only the
centerbay for fuel and engine.
I read somewhere that the Israelis use a tilt-duct system to emplace small sensors on rooftops in places where they otherwise cannot go. I think it
involves the power system being ahead of the main payload bay in a vertical stack and the entire unit articulating to provide forward motion. Whether
they can actually achieve horizontal (fuselage to airstream) flight I don't know.