Banks Maxwell 72” and 70”

[Brenda26]

I have two Banks Maxwell propellers. One is 72” the other 70”
I know this company mainly made boat props but these seem very large for a boat. The green has been painted. Im not sure about the red. I have seen 36” approx value at $600-800 but nothing on the 70-72”. If anyone has info I would much appreciate anything. Thank you!

[Mtskull]

Looking at this listing for Banks-Maxwell propellers: https://woodenpropeller.com/Banks-Maxwell.html
It can be seen that diameters of 70-84 inches are classed as “regular diameter” for airboat and snow sleigh applications and nothing about your propellers is inconsistent with this.

[Dbahnson]

The squared off tips are common on airboats where screens are used to protect occupants, but some aircraft were equipped with squared tips as well. I suspect that both of these airboat models.