• # Airplane Propeller Diameter Vs Pitch

Airplane propeller diameter vs pitch is an element that engineers constantly go over. Simply put, they influence the motor thrust of the aircraft. The same rule applies to boats when they are crossing waters. Blade pitch and diameter can influence an aircraft’s speed and acceleration. The bigger the propeller, the more air or fluid is absorbed per revolution. This results in faster speed.

### How to Measure Propellers

Start measuring from the propeller’s center spindle shaft up to the end of the blade. The figure you get is the radius. Multiply the radius by 2. The result is its diameter. It is not possible to give tip to tip diameter measurements. This is because propellers have many blades.

### How to Determine a Propeller Pitch

Get the propeller height from the part which is highest from the ground. Get the measurements between the table top and the blade’s lower edge. Find the difference between the two points. This will give you the blade height. From the same area where you took the height figures, calculate the width of the blades. In this example, the width and height are 4 x 2.5 inches respectively.

Calculate the space from the point where the previous measurements were done up to propeller’s spindle shaft center. Now get the ratio fraction (RF) from the part by the blade compared with the entire blade length. Assume the blade is 5 inches and the measurements were 4 inches from the middle shaft.

Then the measurements were taken 4/5 from the shaft to the diameter. The formula is pitch = (RF * 3.1416) * diameter * height / blade width. Given the figures above, the pitch = (4/5 * 3.1416) * 9 * 2.5 / 4, or the pitch = 14.14 inches.

### Other Information

An aircraft pitch has to correspond to the airframe and engine. The word pitch denotes the blade angle of a propeller in relation to the vertical axis of the aircraft. A low pitch has less angle than a high one. If you want increased air per revolution, more pitch angle is required. A higher pitch drops engine RPM. Because of these reasons, pitch angles have to be considered carefully.

Airplane propeller diameter vs pitch can be a complicated subject. But understanding their properties is necessary for pilots and aircraft developers. Even RC plane hobbyists delve into these matters. Knowing their features makes it easier to learn how they work.