Inventor Maitland B. Bleecker performs ground test of his new helicopter in New York City

The video describes a unique heavier-than-air craft capable of vertical ascent without a take-off run, horizontal flight at speeds up to 70 mph, and movement in any direction. It details the craft's propulsion system, where wings revolve due to propellers driven by a central air-cooled engine.

What is a unique feature of this heavier-than-air craft?

• It is slower than most aircraft.

• It can ascend without a take-off run.

• It requires a long runway for take-off.

• It can only fly forwards.

How fast can this craft travel?

• 90 miles an hour

• 70 miles an hour

• 50 miles an hour

• 100 miles an hour

In which directions can the craft move?

• Only sideways

• Sideways, backwards, and forwards

• Only forwards

• Forwards and backwards

What causes the wings of the craft to revolve?

• Wind power

• Propellers mounted on each wing

• Solar panels

• Manual operation by the pilot

How are the propellers driven?

• Through a gear-and-shaft arrangement from a central engine

• By individual engines on each wing

• By manual cranking

• By solar power