I have been very pleased with the Bruntons 3 blade Autoprop on Alianna. Have owned her 15 years and not a problem to report. Powered by a Universal M4-30 plenty of forward propulsion under all sea conditions I have encountered, very strong reverse and not much drag and when locked in forward under sail. 1 hub anode has lasted all those years but i also use 2 shaft zincs which get replaced every spring. Not cheap but excellent propulsion system for a 35 MKII
On Thu, Sep 19, 2019 at 11:59 AM Charlie Nelson via CnC-List < cnc-list@cnc-list.com> wrote: > Many years ago (>5?) I sprung for the Gori 2 blade, rated then per tank > tests to be the lowest drag 2 blade geared folder available. > > Worked with AB marine (Geoff? a New Zealander) and got everything right > the first time and have never had any problems. I do have it cleaned up and > serviced every year at haulout. > > When new it was such a beautiful shiny piece of bronze/brass engineering I > ‘almost’ hated to install it underwater!. > > Charlie Nelson > Water Phantom > 1995 C&C XL/kcb > Sent from AOL Mobile Mail > Get the new AOL app: mail.mobile.aol.com > > On Thursday, September 19, 2019, Matthew L. Wolford via CnC-List < > cnc-list@cnc-list.com> wrote: > > Yes, the Flex-o-Fold prop also solves the problem (for racing) of a Martec > blade hanging down if not aligned. > > *From:* Hoyt, Mike via CnC-List <cnc-list@cnc-list.com> > *Sent:* Thursday, September 19, 2019 10:21 AM > *To:* mailto:cnc-list@cnc-list.com <cnc-list@cnc-list.com> > *Cc:* Hoyt, Mike <mike.h...@impgroup.com> > *Subject:* Re: Stus-List The Low drag Prop saga is over! > > > Hi Francois > > > > Our boat although much smaller than a 34+ (Frers 33) also has 3GM30F with > 1:2.61 Kanzaki transmission. We had a Martec RH16D x 14P-3 prop that > worked fine in fwd and poorly in reverse. Flex-o-fold sent 16x12 R > bladeset and 2 blade hub. It arrived in 3 days after order. > > > > It is a bit smoother than the Martec in fwd, has much better reverse and I > now know that we don’t have the possibility of one blade hanging down (we > could never align shaft due to access). We are very happy with the > flex-o-fold. > > > > I thought I had heard somewhere that optimum RPM is 80% of WOT. On the > 3GM30F with WOT at approx. 3400 RPM that is 2720. We run at 2800RPM. 3100 > seems a bit in excess of 80% > > > > I also wonder how much difference the size and weight of a boat comes into > play. Our 33 is design displacement 9000 lbs and yet has same engine and > transmission. > > > > Mike Hoyt > > Persistence > > 1987 Frers 33 #16 > > Halifax, NS > > www.hoytsailing.com > > > > *From:* CnC-List <cnc-list-boun...@cnc-list.com> *On Behalf Of *Francois > Rivard via CnC-List > *Sent:* September 19, 2019 10:23 AM > *To:* captnga...@gmail.com; cnc-list@cnc-list.com > *Cc:* Francois Rivard <jeanfrancoisriv...@gmail.com> > *Subject:* Stus-List The Low drag Prop saga is over! > > > > Hi Gary, > > > > You're right the 34+, 34/36, 34 R's came with a variety of engines and > transmissions. They had me submit both my engine serial # and a picture of > the transmission placard. (Yanmar 3GM30F / Kanzaki 2.6:1 Ratio) and they > said: "Your engine is the most popular out there, we know what we're doing" > > > > They didn't. Max RPM was a struggling and smoking 3000-3100. Yanmar says > it should be 3,400 continuous / 3,600 1 hour rating. That + on my boat: > the vibrations sounded / looked destructive. > > > > I had a lot of time to research all that and this over-pitching thing is a > commonly done to make their product look more efficient. The "Voile" > French Magazine did a low drag prop test and they stated that a few > manufacturers had sent over pitched props / Flex o fold was the worst > offender. The comment was that the Flex o Fold was very fuel efficient > but: "Be careful with the throttle, the prop is dangerously over-pitched, > you could damage your engine". > > > > Live and learn.. > > > > Francois > > 1990 34+ "Take Five" > > Lake Lanier, GA > > > > > > ----------------------------------- > Hi Francois, > I had the same problem. It turned out my 37+ was delivered with 2 > different transmission ratios, and the previous owner had ordered the prop > for the wrong ratio. I wonder if the 34+ is available with 2 different > transmission ratios. Once they sent me the correct prop she was fine. > Agreed, they weren't the most friendly to deal with. > > Gary > S/V Kaylarah > '90 C&C 37+ > East Greenwich, RI, USA > > ------------------------------ > _______________________________________________ > > 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 > > _______________________________________________ > > 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 > > _______________________________________________ > > 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 > > -- Sent from Gmail Mobile
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