I have to provide the dissenting opinion on the Martec prop. Many years ago, I had to make a quick stop when two kids in a dinghy came out of a mooring field in front of me. In order not to hit them I slammed the boat in reverse. Being not geared, one of the blades did not open. The resulting imbalance ( at full power) bent the shaft severely. The resulting 1/2" run out created incredible vibration. The shaft and prop had to be removed for repair. I would never use a folding prop that isn't geared. I currently use a 3 blade Flex-O-Fold prop which has very good reviews and I'm happy with it.
Gary S/V Kaylarah '90 C&C 37+ East Greenwich, RI, USA ~~~~~~~_/)~~~~~~ On Fri, Feb 16, 2018 at 9:54 AM, Dreuge via CnC-List <cnc-list@cnc-list.com> wrote: > > My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and I > agree with others that the performance is surprising good. Yes I often > forget/neglect to align the blades, and I have experienced the boat shake > on a rare occasions. Performance wise, forward to hull speed is no problem > in flat water, but like others, I cruise at about 6.5 with a lower rpm > (Yanmar 3QM30/Paragon/Walter-Vee). With regards to backing/stopping, I > have not hit anything (harder than willing) yet. I do get some starboard > prop walk which I try to take advantage of, but it is nothing compared to > the walk of my old 29Mk1 w/ a fixed 2 bladed prop. > > > - > Paul E. > 1981 C&C 38 Landfall > S/V Johanna Rose > Fort Walton Beach, FL > > http://svjohannarose.blogspot.com/ > > On Feb 15, 2018, at 10:32 PM, cnc-list-requ...@cnc-list.com wrote: > > My Martec runs very smoothly with a couple small harmonics at different > rpm's. That's normal for nearly all drive trains. > > Forward power is good. I think my prop is a wee bit underpitched. I can > get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise > rpm (80% max). > > I really haven't had any issue with opening, closing, etc. I think the > Martec is a good choice for folks who race and want minimal drag. If my > use was only cruising, I'd probably have a different prop. > > Dennis C. > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > >
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