It is essentially a flying tank - a helicopter designed to survive heavy attack and inflict massive damage.

Others questioned the sorry state of maintenance and the military incompetence that let a helicopter designed to carry 80 people take off with 147 on board.

The helicopter, designed to carry 22 tons of cargo or 80 combat-equipped troops, was carrying at least 147 passengers when it crashed.

Aerial crane or 'Sky cranes' usually are helicopters designed to lift large loads.

The first staircase has a sense of expectancy and drama; that is the spot for an actual-size helicopter designed by Arthur Young.

The Flettner Fl 265 was an experimental helicopter designed by Anton Flettner.

The Robinson R66 is a turbine-powered helicopter designed and built by the Robinson Helicopter Company.

Some helicopters reached limited production, but it was not until 1942 that a helicopter designed by Igor Sikorsky reached full-scale production, with 131 aircraft built.

The Piasecki PV-2 was a helicopter designed by Frank Piasecki.

Many in Congress opposed to Lockheed's international team argued that the president should be ferried only in a helicopter that was American designed and made.