I sat through a brief on tilt rotors and was informed by some engineering type boffin that, tilt rotor craft were the way forward due to the faster airspeeds they can achieve and that the approach angle to a HLS can be steeper. It kind of spoiled it when he went on to explain that vortex ring happens at a higher airspeed with lesser rates of descent making steeper approaches more dangerous.
Tilt rotors: definately something there but when Westlands are producing a rotor with a tip speed of Mach 1+, allowing helos to travel at 200kts+ do we really need them?
"Lifting!"
AD