View Full Version : How are 4-bladed props made?

01-08-2008, 10:11 PM
I'm curious about the construction of 4-bladed propellers. It is essentially two regular propellers that are "notched" and fitted together. Or are alternating laminations laid down in the two directions, or what?

01-09-2008, 11:30 AM
Of the ones I've seen they are made from two props that are notched.


01-09-2008, 03:27 PM
Some were made with overlaping joints so it was a true 4 blade. I think I have some drawings of the process from Paragon. I'll see if I can dig them out.

01-09-2008, 07:37 PM
Here's a page from a 1920 Paragon brochure showing the construction of a 3 bladed prop at the hub:


01-10-2008, 03:00 PM
Very interesting! That would certainly test the skills of any woodworker!

I suppose I was primarily wondering about the techniques used on earlier WWI era 4-blades props such as the ones used on the RE8s and DH4s, as well as some variants of the SE5a.