I'm getting ready to figure out what prop my project boat needs. I've heard when going from a 3 blade prop to a 4 blade prop that the rule of thumb is to drop one size in pitch. Is this accurate?
So far I've tried a 14.25x17 & a 14x19c & it doesn't like to get on plane very well with the 19 pitch prop. Once it did it ran like a scalded dog.
The 17p seemed to do alright but I did not have my shop tach with me to see what the rpm's were with either prop. Going back out this weekend with tach & taking notes.
Jim
So far I've tried a 14.25x17 & a 14x19c & it doesn't like to get on plane very well with the 19 pitch prop. Once it did it ran like a scalded dog.
The 17p seemed to do alright but I did not have my shop tach with me to see what the rpm's were with either prop. Going back out this weekend with tach & taking notes.
Jim