propeller terminology

[steamy miller]

Hello.

Could someone enlighten me on the standard propeller terms such as 34-24; 26-20, etc. Presumably at least 1 number refers to the length or possibly diameter. Probably useful to know what these terms mean so that they can be successfully applied.

Thanks.

[wdyasq]

Propellers are sometimes referred to as 'Screws' - Normally the first number is the diameter and the second is the 'Pitch' - the distance the propeller would travel in one revolution - 'Without slip'.

I hope you are referring to boat propellers.... although the prinicples and numbers are similar on airplanes.

Ron