The first transition from hover to horizontal flight occurred on 24 May 1958.

It took off and landed vertically, but never achieved transition to horizontal flight.

Rockets would assist the aircraft to transition to horizontal flight.

Then we get our greatest Speed, just maintaining horizontal flight.

This gives the greatest velocity during horizontal flight at a low altitude.

They averaged 2,070 miles per hour over a 17-kilometer straight away course, then held 80,257 feet to establish a world record for sustained horizontal flight.

The first conversion to horizontal flight took place on 5 November 1954.

Halfway to the ground pull again for horizontal flight.

The rotors provided the only significant lift in horizontal flight.

In horizontal flight the rotor stopped to act like a wing.