I have the smaller 34R with a 27Hp diesel. The transmission is slightly above 2:1. I have a 15" two blade prop and set it to 18 degrees, I think. The setting from PYI when I got the prop was a little aggressive and I dropped it 2 degrees. If I let the bottom get horrible, the first sign is slow speed and wiping off the scum makes a huge difference. Generally I can get good speed with a clean bottom up to about 6.6 at 2800 rpm. I get better speed sailing, as the two blade lacks area to really push the hull. Compared to similar boats, I got the wrong prop and a 16" would have been better for my boat. The two blade is preferred for racing, as you can set the blades vertically and decrease the drag. Based on your email, I think you lowered the pitch rather than increased it. Chuck Scheaffer, Resolute 1989 C&C 34R, Magothy River, Md
> On 08/20/2025 4:10 PM EDT rockland bazemore via CnC-List > <[email protected]> wrote: > > > Wondering what setups you all have with this configuration. > We have a newer 16" Maxprop (I never measured) with recently adjusted to 14º > pitch based on Rob's 37+ setup. He does a lot closer to hull speed. > > When we left for our trip in Annapolis we could do 5.2kn. The bottom was > cleaned about 3 weeks prior. > I changed the pitch to 14º in Block Is. > Couple weeks later and now we only do 4.2kn in slack water. > The bottom doesn't seem to be THAT bad. The prop and shaft are very clean. > I'm wondering now if its possible transmission slipping? The ATF oil smells > fine. > > Gear ratio 2.14 Prop shaft 1-1/8" > > Ideas? > > -- > Rockland Bazemore > S/V Blue Pearl > C&C 37/40+ > Annapolis, MD > Your contributions help pay the fees associated with this list and help to > keep it active. Please help by making a small contribution using PayPal at: > https://www.paypal.com/paypalme/stumurray All contributions are greatly > appreciated. >
Your contributions help pay the fees associated with this list and help to keep it active. Please help by making a small contribution using PayPal at: https://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
