Interesting idea, keen to see what the experts think, having a folding prop myself. from experience a two bladed folder can work very well. I delivered a 45 foot motorsailer
with a two bladed folding prop. I was very sceptical about it, but found it had tonnes of grunt in ahead and astern. We punched our way into all sorts of stuff as if she had a fixed 3 blader, infact I thought she was way better than most boats I have been on.
I finally got to see the prop. It was a big wide thing. the blades where like plates, almost round. The swept area was massive unlike most yachts props with narrow skinny blades.
Another boat had an oversize and overpitched 2 bladed folding prop to give more efficiency motor
sailing in the light stuff. It was pretty crap at punching into anything.
he has since reduced the pitch
and it works much better. got to find out if he also reduced the diameter.
A big benefit of the folders for your cat is improved steering
control under sail. A big spinning fixed prop right ahead of the rudder
really messes up the flow.