Not really Alan , just quoted Nigel Calder in one of his posts
I have read more about this the last 30 years and efficiency,s of props vary a lot as you can see in the tests. I am not trying to sell anything , just trying to make you aware of huge differences between props.
This is a part of the write up by Nigel Calder about a 3 blade
"On most sailboats even a well-matched three-bladed propeller
is, at best, only 60 percent efficient. The other 40 percent of shaft energy is dissipated into the water
to no useful effect. Some two-bladed folding propellers are as little as 20 percent to 25 percent efficient."
Gori three-bladed folding propeller