Propeller Pattern

[rfdavis]

Hi, I've been asked if I would make a 10' windmill prop. Has anyone ever done this using the CW Machine?

[bergerud]

Welcome to the forum. I do not see why one could not do it. 5 ft pieces? Any idea what the prop would look like? Three blade? Unitedcases here on the forum makes full scale models of helicopter blade sections.

[rfdavis]

This blade is just one piece like a airplane prop. It is how to get the right pitch angle etc on it. I found one in the patterns on CW but do not know if I could stretch it out to 10'

[bergerud]

I do not think that propeller blades scale up very well. I would not, for example, scale up a model airplane propeller to be used on a wind mill. It would be very heavy and would not be right for the speed. Do some research on it and see what you can learn.

[rfdavis]

Thanks,
I've looked on you-tube and found some videos. Looks like a lot of work.

[bergerud]

Here is a blade STL I found on GrabCad. If you have Designer 2 or 3, you could scale this up and carve it with the 1/8" deep bit. (I did scale it up to 5 ft long on a 70" X 14.5" X3.125" board)

[rfdavis]

Thanks,
I will try to scale it up on a 2X6 and give it a try.