1929 Arrow Sport biplane propeller

[Vasek]

Hello,

On the picture below you can see a propeller that seems to be Gardner type 1471-D. It is supposed to be installed on Leblonde 85hp, on the pictures the propeller is installed in Leblonde 60hp.

The mission is to make a propeller of a custom pitch, while the length and outline should remain as close to the original as possible.

Now my question is - do we have any frontal picture of a Gardner propeller to get an approximate outline and is there a reliable source somewhere with the original length/pitch of this propeller?

Thank you!

[Dbahnson]

I don't know exactly why, but those drawings seem almost impossible to find, not just for Gardner propellers but for almost any other propeller as well.

[Vasek]

I don't need a drawing of the original propeller, as I am a propeller manufacturer and I'm going to use my own airfoil and the pitch will be calculated. Even though the original drawing would be a good source of information. As there are propeller collectors and people with knowledge about particular propeller types from the past here, I thought that there could be someone who owns the original Gardner propeller from that era, or someone who would have a better picture of it than me?

[Dbahnson]

I don't need a drawing of the original propeller, as I am a propeller manufacturer and I'm going to use my own airfoil and the pitch will be calculated. Even though the original drawing would be a good source of information. As there are propeller collectors and people with knowledge about particular propeller types from the past here, I thought that there could be someone who owns the original Gardner propeller from that era, or someone who would have a better picture of it than me?

Got it. Hopefully someone who has one will respond.

Correct me if I'm wrong, but doesn't a photo have an issue with parallax? Wouldn't you need a tracing of the propeller shape?

[Vasek]

Yes, I am looking for the propeller shape. At least the outline / contour of the blade from the frontal view.

My level of English language doesn't allow me to understand the term "issue with parallax"

[Dbahnson]

Parallax refers to the different appearance of an object as seen by a camera (i.e. from a center position) vs. as seen by a scanner (i.e. the entire plane of the object. In other words, a simple photo of the propeller taken from directly in front of the center hole will have some distortion of the blade shape further away from the center.

I think of it this way. If you photograph a propeller with a wide angle lens from a short distance away and also photographic it with a telephoto lens from a long distance away, the images will look quite different. A "tracing" of that same propeller would show its exact shape without those distortions.

It's probably not a big difference, however.