A biplane labeled with its principal parts.

Biplane Parts

A biplane labeled with its principal parts.

A steam ship that aids in daily transportation.

Steam Boat

A steam ship that aids in daily transportation.

This is an aircraft that primarily was intended for flight with use of gliders.

Early Design Flying Machine

This is an aircraft that primarily was intended for flight with use of gliders.

An early propeller

Propeller

An early propeller

"The chamber (curvature) of the blades should be (1) equal, (2) decrease evenly towards the tips of the blades, (3) the greatest depth of the curve should, at any point of the blade, be approximately at the same percentage of the chord from the leading edge as at other points." —Barber, 1917

Aeroplane Propeller Balance Chamber

"The chamber (curvature) of the blades should be (1) equal, (2) decrease evenly towards the tips of…

The illustration of an aeroplane, or airplane, propeller being balanced by using surface area testing. The length of the blade on opposite sides must be equal.

Aeroplane Propeller Balance Blade Surface Area

The illustration of an aeroplane, or airplane, propeller being balanced by using surface area testing.…

An illustration of weighing the propeller of the aeroplane to ensure it is balanced with the opposite side.

Aeroplane Propeller String Balance

An illustration of weighing the propeller of the aeroplane to ensure it is balanced with the opposite…

A machine for propelling an aircraft or boat, consisting of a power-driven shaft with radiating blades that are placed so as to thrust air or water in a desired direction when spinning.

Boat Steer and Propeller

A machine for propelling an aircraft or boat, consisting of a power-driven shaft with radiating blades…

A propeller is a type of fan which transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and air or water is accelerated behind the blade.

Dual Wing Aerial Propeller

A propeller is a type of fan which transmits power by converting rotational motion into thrust. A pressure…

A type of fan which transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and air or water is accelerated behind the blade.

General Purpose Propeller

A type of fan which transmits power by converting rotational motion into thrust. A pressure difference…

Griffith's Propeller, a common form of screw-propeller.

Griffith's Propeller

Griffith's Propeller, a common form of screw-propeller.

"Reversing rod inside hollow propeller shaft: by twisting the blades round, the motion of the boat is reversed without changing the rotation of the screw."—Finley, 1917

Reversible propeller

"Reversing rod inside hollow propeller shaft: by twisting the blades round, the motion of the boat is…

A propeller is a type of fan which transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and air or water is accelerated behind the blade.

Screw Propeller

A propeller is a type of fan which transmits power by converting rotational motion into thrust. A pressure…

Thornycroft's propeller, a common form of screw propeller.

Thornycroft's propeller

Thornycroft's propeller, a common form of screw propeller.

An apparatus which, being fitted to ships and driven by steam, propels them through the water.

Screw-propeller

An apparatus which, being fitted to ships and driven by steam, propels them through the water.