Bell Textron D-314 tiltrotor designs.

But then...what do you consider Vertical "Flight"? A V-22 Osprey or any
other tilt rotor ie. Bell or Kawasaki weren't developed for Vertical
"Flight". They were developed to get to their approximate destinations at
fixed wing speeds. In commercial applications this would allow for them to
fly in a commercial traffic arrival pattern (as toward a major airport and
then "break out" to transition to a heliport. In military applications they
could get to a destination at fixed wing speeds and then transition in and
out of a "LZ" pick up or deploy personnel or cargo. Comparing them to
helicopters is apples and oranges.



Point taken, John. OTOH, aren't you talking about some transition to vertical
flight when they leave standard fixed wing patterns to land at a helipad or
some out of the way LZ that a fixed wing could never hope to arrive at in one
piece? Both of those scenarios will involve a transition to hover for landing
and a vertical lift off to hover before the climb out and acceleration to fixed
wing mode which is not unlike what helicopters do under normal circumstances
anyway, with the exception of the fixed wing mode part, that is. :-)

Fly Safe,
Steve R.