What is the speed of the fastest propeller plane?

1.In 2004, an American named dave rose designed and built a rebel to take part in the Renault flight competition. He used a v8 engine with 1 700 horsepower (propeller at the tail), and the maximum speed was close to 1 Mach (1225 km/h), but this plane didn't.

2. Except the Tu -95 turboprop, the fastest turboprop is the rarebear modified by f8f, which can reach a speed of 850 km/h by removing armor and weapons and replacing it with the b-29 r3350 engine.

3. The fastest fighter in World War II was p-5 1h, 784 km.

4. Russia's Tu -95 uses a turboprop engine (essentially a jet engine with blades) with a maximum speed of 925 km/h. ..

Geometric parameter

Generally speaking, with the increase of the diameter, the pulling force will increase and the efficiency will be improved, so try to choose a propeller with a larger diameter when the structure allows, and at the same time, consider that the air velocity at the blade tip should not be too large (

Number of blades (b)

It can be considered that the tension coefficient and power coefficient of the propeller are in direct proportion to the number of blades, and the Shuang Ye propeller with simple structure is generally used in ultralight aircraft. Only when the diameter of the propeller is limited, the propeller and the engine can be well matched by increasing the number of blades.

Solidity (σ)

The ratio of blade area to propeller rotation area (πr2) has a similar effect on the number of blades, and the tension coefficient and power coefficient increase with the increase of solidity.

Geometric spacing (h)

When the angle of attack of the blade profile is zero, the distance of one revolution of the blade reflects the angle of the blade and directly points out the working characteristics of the propeller. The geometric torque of each part of the blade may not be equal. It is customary to take the geometric torque at 70% of the diameter as the named value, and foreign countries can order propellers according to the diameter and pitch, such as 64/34, which means that the blade diameter is 60 inches and the geometric torque is 34 inches.

Actual pitch (Hg)

The actual propeller torque can be calculated by hg=v/n, and the geometric propeller torque can be roughly estimated by H =1.1~1.3 Hg.

Theoretical torque (ht)

When designing a propeller, the speed of air flowing through the propeller must be considered, and the speed of air flowing through the propeller's rotation plane is greater than the flight speed, so the distance of the propeller relative to the air-the theoretical pitch will be greater than the actual pitch.