Making a 4 blade wood propeller

[Dbahnson]

Here's one link which might be of interest. I'll look through Bob Gardner's books to see if there's some useful information in his extensive documentation.

[Pete Twissell]

Hello all,

I am currently building a model aircraft engine, based on the AirDisco V8, as used in DH51 etc.
I would like to make a 4 bladed propeller, if only for demonstration purposes.
I have made small 2 bladed wood props in the past, both carved from solid and laminated.

I am having difficulty finding any detail of the design of 4 bladed wood props, specifically around the hub arrangement and how laminations are arranged to avoid the obvious weak spots at the roots.

Does anyone have any links, hints, direct experience etc. to point me in the right direction?

My prop will be around 12" diameter, 4" pitch. The engine should be able to turn it at around 7,000 RPM.

Thanks in advance,

Pete.