GRIN.... As long as we'all are talking about Corsairs......

It wasn't until the F4U-4 model that the Corsair went to a 4 bladed prop. The original version and all versions up to that time had less powerful engines. With the F4U-4 the plan was to use a Twin Wasp R-2800-18W (are y'all writing this down ) and it would have overpowered the area they could build into a three bladed prop under wartime conditions. So "... to absorb the additional horsepower, a four blade Hamilton-Standard propeller was fitted."

And some more fun trivia about the Corsair....

It was the first production fighter to have plastic wingtips. And that, when it was still flying with fabric wing covering! It was the fastest fighter of it's period, and it had fabric covered wings!

And it had balsa in it's construction. (No wonder the Corsiar makes such good models.) End grain balsa was sandwiched between two sheets of aluminum to make the skin of the stabilizers.