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I'm going crazy and I'm hoping someone here can help me out. 
I'm in the process of purchasing a 1974 Pearson 30. She's in decent shape. I had her hauled out to have a look at the bottom before I committed to the purchase.
She has sat in the water for two years with no cleaning. As you can imagine there was a lot of slop and barnacles to look at. Other than that, the bottom was in great shape. The current owners decided to go ahead and have to bottom cleaned and sanded to the hull and have fresh bottom paint added. When the boatyard was done she looked like new.
On to my issue. The boat currently has a Martec 2 blade folding prop. According to the stamp on it it is 15 x 12. I'm considering having it replaced with a three blade prop. The boat was repowered with a Universal diesel. I've read that a good rule of thumb when switching from a 2 blade to a three blade is to keep the same diameter but to knock an inch off of the pitch. Through my searches though I'm seeing other P30 owners say that 12in and above is too much for the boat. I know it's dependent on the engine and transmission but I want to make sure I don't get too big of a prop.
Any suggestions? Should I go with a 15 x 11? Another option is to have the current prop sent back to Martec and have it refurbished (it was coated in barnacles and the hub pin was found to be broken when she was hauled). I'd really like the extra power from a three blade. I'm just unsure of what size to go with.
Thanks in advance to anyone who helps. I don't want to screw this up and have to have it hauled again and have to buy another propeller.
I'm in the process of purchasing a 1974 Pearson 30. She's in decent shape. I had her hauled out to have a look at the bottom before I committed to the purchase.
She has sat in the water for two years with no cleaning. As you can imagine there was a lot of slop and barnacles to look at. Other than that, the bottom was in great shape. The current owners decided to go ahead and have to bottom cleaned and sanded to the hull and have fresh bottom paint added. When the boatyard was done she looked like new.
On to my issue. The boat currently has a Martec 2 blade folding prop. According to the stamp on it it is 15 x 12. I'm considering having it replaced with a three blade prop. The boat was repowered with a Universal diesel. I've read that a good rule of thumb when switching from a 2 blade to a three blade is to keep the same diameter but to knock an inch off of the pitch. Through my searches though I'm seeing other P30 owners say that 12in and above is too much for the boat. I know it's dependent on the engine and transmission but I want to make sure I don't get too big of a prop.
Any suggestions? Should I go with a 15 x 11? Another option is to have the current prop sent back to Martec and have it refurbished (it was coated in barnacles and the hub pin was found to be broken when she was hauled). I'd really like the extra power from a three blade. I'm just unsure of what size to go with.
Thanks in advance to anyone who helps. I don't want to screw this up and have to have it hauled again and have to buy another propeller.
