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Old 01-08-2008, 10:11 PM   #1
abufletcher
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Default How are 4-bladed props made?

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?
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Old 01-09-2008, 11:30 AM   #2
MWP_Lamar
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Of the ones I've seen they are made from two props that are notched.

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Old 01-09-2008, 03:27 PM   #3
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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.
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Old 01-09-2008, 07:37 PM   #4
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Here's a page from a 1920 Paragon brochure showing the construction of a 3 bladed prop at the hub:

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Old 01-10-2008, 03:00 PM   #5
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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.
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