2 blade fan "bullet-proof?"

The way to bullet proof an original two blade fan is to have it sitting on your shelf.
I tried to keep a perfect looking one on my car and it went thru my hood but not the radiator.
 
Bob brought up an interesting point. Fatigue failure was not well understood in 1928. The steel that Ford used then was amazingly strong when first made but is not very fatigue resistant. A good example is the Model T crankshaft. Ford published photos of the crank being bent in half, but after 100 years they commonly break because of fatigue fractures.
 
The original design of the 2-blade fan on the Model A & Model B is a folded sheet metal affair that is inappropriate for a propeller. Moreover, the amount of the original fan's fatigue life that has been expended is unknown. I caution all that there is no practical modification / repair that makes the 90+ year-old 2-blade original fan safe!
 
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