Whitehead did not give identifiers to his first aircraft, but according to Randolph and Harvey to the end of 1901 he had built "fifty-six airplanes".

Whitehead's Number 21 monoplane had a wingspan of 36 ft (11 m).
The fabric-covered wings were ribbed with bamboo, supported by steel wires and were very similar to the shape of the Lilienthal glider's wings.
The arrangement for folding the wings also closely followed the Lilienthal design.
The craft was powered by two engines: a ground engine of 10 hp (7.5 kW), intended to propel the front wheels to reach takeoff speed, and a 20 hp (15 kW) acetylene engine powering two propellers, which were designed to counter-rotate for stability.

Whitehead described his No.
22 aircraft and compared some of its features to the No.
21 in a letter he wrote to the editor of American Inventor magazine, published 1 April 1902.
He said the No.
22 had a five-cylinder 40 hp kerosene motor of his own design, weighing 120 lbs.
He said ignition was "accomplished by its own heat and compression."
He described the aircraft as 16 feet (4.9 m) long, made mostly of steel and aluminum with wing ribs made of steel tubing, rather than bamboo, which was used in the Number 21 aircraft.
He explained that the two front wheels were connected to the kerosene motor, and the rear wheels were used for steering while on the ground.
He said the wing area was 450 square feet (42 m²), and the covering was "the best silk obtainable."
The propellers were "6 feet in diameter ... made of wood ... covered with very thin aluminum sheeting."
He said the tail and wings could all be "folded up ... and laid against the sides of the body."

In 1905, he and Stanley Beach jointly filed for a patent – issued 1908 – for an "improved aeroplane" with a V-shaped trough body and fixed bird-like wings, the pilot hanging below supported by a swing seat.
A jointly-designed biplane was built by Whitehead and fitted with a Whitehead 5-cylinder, water-cooled 50 hp motor.
The pointed bow of the craft comprised a metal water tank, with hot water being sprayed against the sides inside for cooling.

Whitehead also built gliders until about 1906 and was photographed flying them.
Whitehead did not give identifiers to his first aircraft, but according to Randolph and Harvey to the end of 1901 he had built "fifty-six airplanes".
Whitehead's Number 21 monoplane had a wingspan of 36 ft (11 m). The fabric-covered wings were ribbed with bamboo, supported by steel wires and were very similar to the shape of the Lilienthal glider's wings. The arrangement for folding the wings also closely followed the Lilienthal design. The craft was powered by two engines: a ground engine of 10 hp (7.5 kW), intended to propel the front wheels to reach takeoff speed, and a 20 hp (15 kW) acetylene engine powering two propellers, which were designed to counter-rotate for stability.
Whitehead described his No. 22 aircraft and compared some of its features to the No. 21 in a letter he wrote to the editor of American Inventor magazine, published 1 April 1902. He said the No. 22 had a five-cylinder 40 hp kerosene motor of his own design, weighing 120 lbs. He said ignition was "accomplished by its own heat and compression." He described the aircraft as 16 feet (4.9 m) long, made mostly of steel and aluminum with wing ribs made of steel tubing, rather than bamboo, which was used in the Number 21 aircraft. He explained that the two front wheels were connected to the kerosene motor, and the rear wheels were used for steering while on the ground. He said the wing area was 450 square feet (42 m²), and the covering was "the best silk obtainable." The propellers were "6 feet in diameter ... made of wood ... covered with very thin aluminum sheeting." He said the tail and wings could all be "folded up ... and laid against the sides of the body."
In 1905, he and Stanley Beach jointly filed for a patent – issued 1908 – for an "improved aeroplane" with a V-shaped trough body and fixed bird-like wings, the pilot hanging below supported by a swing seat. A jointly-designed biplane was built by Whitehead and fitted with a Whitehead 5-cylinder, water-cooled 50 hp motor. The pointed bow of the craft comprised a metal water tank, with hot water being sprayed against the sides inside for cooling.
Whitehead also built gliders until about 1906 and was photographed flying them.
Gustave Whitehead