Re-powering Cal 31 - Propeller recommendation/experience

Hi I'm new to the group and to a 1979 Cal 31. I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. I'm considering a Campbell Sailor CS3RH14x10 I'm looking for advise from Cal sailors on the new propeller. Thanks Max

Hello Max - I've got a Cal 31 (Hull #2) located in Annapolis, MD still running with the Volvo. Where are you? -Jeff Poersch On Feb 22, 2011, at 1:00 PM, max.kloster wrote: > Hi > I'm new to the group and to a 1979 Cal 31. > > I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. > I'm considering a Campbell Sailor CS3RH14x10 > > I'm looking for advise from Cal sailors on the new propeller. > > Thanks > > Max > >

Campbell sailor props are very inefficient. The blades have minimal area, and are quite thick. They are too much of a compromise between minimal drag under sail, and efficient powering. Much better is to install a 2 blade prop with large blade area. Less money, and an excellent compromise between a standard 2 blade and a standard 3 blade prop. [ most of the thrust of a 3 blade, but less drag and cost ] If you can afford it, a 2 blade folding prop [ Gori, Flex O Fold, etc ] is fabulous under power, particularly in astern, with extreme low drag under sail. *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184* On 2/22/2011 1:00 PM, max.kloster wrote: > Hi > I'm new to the group and to a 1979 Cal 31. > > I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. > I'm considering a Campbell Sailor CS3RH14x10 > > I'm looking for advise from Cal sailors on the new propeller. > > Thanks > > Max > > > > ------------------------------------ > > Yahoo! Groups Links > > > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: 02/22/11 02:34:00 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

Hi Jeff, I'm docked in Newport Oregon. I actually kind of enjoy keeping the Volvo running but my family members with jobs and limited time are lobbing for something more reliable. Max On Feb 22, 2011, at 10:07 AM, Poersch Jeffrey L. wrote: > Hello Max - I've got a Cal 31 (Hull #2) located in Annapolis, MD still running with the Volvo. Where are you? -Jeff Poersch > > > On Feb 22, 2011, at 1:00 PM, max.kloster wrote: > >> >> Hi >> I'm new to the group and to a 1979 Cal 31. >> >> I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. >> I'm considering a Campbell Sailor CS3RH14x10 >> >> I'm looking for advise from Cal sailors on the new propeller. >> >> Thanks >> >> Max >> > > >

Why so much power in your boat? The 3YM30 makes 29 horsepower. Your boat is easily driven in most conditions with an engine of 20 hp, while also charging batteries. More power will not make your boat go any faster, it just makes money fly out of your wallet faster. Joe D On 2/22/2011 1:00 PM, max.kloster wrote: > Hi > I'm new to the group and to a 1979 Cal 31. > > I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. > I'm considering a Campbell Sailor CS3RH14x10 > > I'm looking for advise from Cal sailors on the new propeller. > > Thanks > > Max > > > > ------------------------------------ > > Yahoo! Groups Links > > > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: 02/22/11 02:34:00 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

I am repowering my Cal 31 this year with a Betamarine 16hp that I plan on buying through Joe DeMers. If you need some Md7a parts let me know. My engine starts right up but I have some cooling issues that have reduced my trust in the old beater. Bob Connell "Jollygood!", Cal 31, #59 Shilshole Bay, WA From: max.kloster <kl… [at] casco.net> To: Ca… [at] yahoogroups.com Sent: Tue, February 22, 2011 10:00:39 AM Subject: [Cal_Boats] Re-powering Cal 31 - Propeller recommendation/experience Hi I'm new to the group and to a 1979 Cal 31. I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. I'm considering a Campbell Sailor CS3RH14x10 I'm looking for advise from Cal sailors on the new propeller. Thanks Max

Hi Joe, My main concern is crossing the bars in Newport and on the Columbia. I never plan on being out in bad conditions but I have found myself unintentionally fighting strong currents and winds to get to a port. I have experienced being underpowered and did not like it at all. I view extra power as an insurance policy that I'm willing to pay for in extra fuel bills. Thanks again for your excellent article on re-powering, it's very thought provoking! Max --- In Ca… [at] yahoogroups.com, Joe DeMers <jedsail@...> wrote: > > Why so much power in your boat? The 3YM30 makes 29 horsepower. > > Your boat is easily driven in most conditions with an engine of 20 hp, > while also charging batteries. More power will not make your boat go any > faster, it just makes money fly out of your wallet faster. > > Joe D > > > > On 2/22/2011 1:00 PM, max.kloster wrote: > > Hi > > I'm new to the group and to a 1979 Cal 31. > > > > I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. > > I'm considering a Campbell Sailor CS3RH14x10 > > > > I'm looking for advise from Cal sailors on the new propeller. > > > > Thanks > > > > Max > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > > > > > No virus found in this incoming message. > > Checked by AVG - www.avg.com > > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: 02/22/11 02:34:00 > > > > -- > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* >

Max we have a Cal 29 and have tried 3 different props (still have org A 4) 2 blade (not much bite in rev) indigo 3 blade (good rev but melted after 12mo we in a HOT harbor) I 'd reccomend MAX PROP 3 blade we got ours off craigslist 15 in and was beat up edges But only $150 sent to PVI they cut it down to 13 for $300 more this prop is fully ajustable pitch And will work on right hand OR left hand shafts ... and we picked up 1 kt under sail because of low drag when feathered....I found a lot of people waste years of sailing doing repowers and trying to save $$$ only to sit at the dock...clean out diesel tank get a new racor filter ... if eng runs, run it you only need it till you get your sails up !!! our boat goes out 30 to 40 times a year we start engine every week ....its called AUXZILLERY SLOOP.... not motor sailer edward "NOAH'S KID" "sailing doesn't start till you leave the dock and turn you engine OFF" UNTILL WE CURED FUEL PROBLEM ...small crack in O ring on deck fill which let water drip into tank till water seapator filled with water and eng died ... we REALLY learned how to sail.. GOOD LUCK From: Joe DeMers <je… [at] mindspring.com> To: Ca… [at] yahoogroups.com Sent: Tue, February 22, 2011 10:18:20 AM Subject: [Cal_Boats] Engine size [ was Re-powering Cal 31 - Propeller recommendation/experience Why so much power in your boat? The 3YM30 makes 29 horsepower. Your boat is easily driven in most conditions with an engine of 20 hp, while also charging batteries. More power will not make your boat go any faster, it just makes money fly out of your wallet faster. Joe D On 2/22/2011 1:00 PM, max.kloster wrote: Hi >I'm new to the group and to a 1979 Cal 31. > >I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. >I'm considering a Campbell Sailor CS3RH14x10 > >I'm looking for advise from Cal sailors on the new propeller. > >Thanks > >Max > > > >------------------------------------ > >Yahoo! Groups Links > > > No virus found in this incoming message. Checked by AVG - www.avg.com >Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: 02/22/11 >02:34:00 > > -- Joe DeMers - owner Sound Marine Diesel LLCSoundMarineDiesel.com phone & fax (860) 666-2184

Max, Welcome to the group, I hope you get the answers you need on your prop options.. I will second Joe's comments on the folding props. We have a 2 blade Gori folding prop on our Cal 29 and we love it. Richard Anderson --- In Ca… [at] yahoogroups.com, Joe DeMers <jedsail@...> wrote: > > Campbell sailor props are very inefficient. The blades have minimal > area, and are quite thick. They are too much of a compromise between > minimal drag under sail, and efficient powering. > > Much better is to install a 2 blade prop with large blade area. Less > money, and an excellent compromise between a standard 2 blade and a > standard 3 blade prop. [ most of the thrust of a 3 blade, but less drag > and cost ] > > If you can afford it, a 2 blade folding prop [ Gori, Flex O Fold, etc ] > is fabulous under power, particularly in astern, with extreme low drag > under sail. > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* > > > On 2/22/2011 1:00 PM, max.kloster wrote: > > Hi > > I'm new to the group and to a 1979 Cal 31. > > > > I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. > > I'm considering a Campbell Sailor CS3RH14x10 > > > > I'm looking for advise from Cal sailors on the new propeller. > > > > Thanks > > > > Max > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > > > > > No virus found in this incoming message. > > Checked by AVG - www.avg.com > > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: 02/22/11 02:34:00 > > > > -- > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* >

What about a martec folding? ----- Original Message ----- From: wirelessmonster To: Ca… [at] yahoogroups.com Sent: Wednesday, February 23, 2011 1:13 PM Subject: [Cal_Boats] Re: Re-powering Cal 31 - Propeller recommendation/experience Max, Welcome to the group, I hope you get the answers you need on your prop options.. I will second Joe's comments on the folding props. We have a 2 blade Gori folding prop on our Cal 29 and we love it. Richard Anderson --- In Ca… [at] yahoogroups.com, Joe DeMers <jedsail@...> wrote: > > Campbell sailor props are very inefficient. The blades have minimal > area, and are quite thick. They are too much of a compromise between > minimal drag under sail, and efficient powering. > > Much better is to install a 2 blade prop with large blade area. Less > money, and an excellent compromise between a standard 2 blade and a > standard 3 blade prop. [ most of the thrust of a 3 blade, but less drag > and cost ] > > If you can afford it, a 2 blade folding prop [ Gori, Flex O Fold, etc ] > is fabulous under power, particularly in astern, with extreme low drag > under sail. > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* > > > On 2/22/2011 1:00 PM, max.kloster wrote: > > Hi > > I'm new to the group and to a 1979 Cal 31. > > > > I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. > > I'm considering a Campbell Sailor CS3RH14x10 > > > > I'm looking for advise from Cal sailors on the new propeller. > > > > Thanks > > > > Max > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > > > > > No virus found in this incoming message. > > Checked by AVG - www.avg.com > > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: 02/22/11 02:34:00 > > > > -- > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* > __________ Information from ESET NOD32 Antivirus, version of virus signature database 5901 (20110223) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 5901 (20110223) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

Martec props are strictly for racing. If you don't mind _very inefficient_ powering [ especially in astern ] then you should buy a Martec. Gori props are _FAR superior_ for cruising or racing boats. Here's why - Gori prop blades are geared together. Therefore, they always open the same amount, and can never cause a shaft imbalance with the resulting vibration. Martec prop blades operate independently of each other, and commonly cause vibration. An added benefit of Gori's geared together design, is that it is self cleaning. Gori blades have a large blade area. This results in very efficient powering in ahead, AND astern. They are superior in every way when compared to a fixed blade prop. Note that all feathering props [ such as Maxprop ] MUST USE flat blades with no camber [ no twist ] . Have you ever seen an aircraft prop blade that's perfectly flat? They don't exist, because of the high inefficiency of that design. This is why a folding prop that has camber will always produce more thrust than any flat bladed prop. The Gori 3 blade folder has a unique feature. It can be shifted into "overdrive". When the sea is calm, the overdrive can be used to drive the boat to hull speed with reduced engine RPM. This saves fuel, noise, and wear and tear on the entire drivetrain. The above reasons are why I am a Gori prop dealer. Joe D On 2/23/2011 4:36 PM, Mark Alan Stahnke (MAS Consulting) wrote: > > > What about a martec folding? > > ----- Original Message ----- > *From:* wirelessmonster <mailto:ri… [at] richardanderson.net> > *To:* Ca… [at] yahoogroups.com <mailto:Ca… [at] yahoogroups.com> > *Sent:* Wednesday, February 23, 2011 1:13 PM > *Subject:* [Cal_Boats] Re: Re-powering Cal 31 - Propeller > recommendation/experience > > Max, > > Welcome to the group, I hope you get the answers you need on your > prop options.. I will second Joe's comments on the folding props. > We have a 2 blade Gori folding prop on our Cal 29 and we love it. > > Richard Anderson > > --- In Ca… [at] yahoogroups.com > <mailto:Ca… [at] yahoogroups.com>, Joe DeMers <jedsail@...> wrote: > > > > Campbell sailor props are very inefficient. The blades have minimal > > area, and are quite thick. They are too much of a compromise > between > > minimal drag under sail, and efficient powering. > > > > Much better is to install a 2 blade prop with large blade area. > Less > > money, and an excellent compromise between a standard 2 blade and a > > standard 3 blade prop. [ most of the thrust of a 3 blade, but > less drag > > and cost ] > > > > If you can afford it, a 2 blade folding prop [ Gori, Flex O > Fold, etc ] > > is fabulous under power, particularly in astern, with extreme > low drag > > under sail. > > > > *Joe DeMers - owner* > > > > Sound Marine Diesel LLC > > > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > > > *phone & fax (860) 666-2184* > > > > > > On 2/22/2011 1:00 PM, max.kloster wrote: > > > Hi > > > I'm new to the group and to a 1979 Cal 31. > > > > > > I'm tired of repairing an old Volvo MD7A and will re-power > with a Yanmar 3YM30. > > > I'm considering a Campbell Sailor CS3RH14x10 > > > > > > I'm looking for advise from Cal sailors on the new propeller. > > > > > > Thanks > > > > > > Max > > > > > > > > > > > > ------------------------------------ > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > No virus found in this incoming message. > > > Checked by AVG - www.avg.com > > > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release > Date: 02/22/11 02:34:00 > > > > > > > -- > > > > *Joe DeMers - owner* > > > > Sound Marine Diesel LLC > > > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > > > *phone & fax (860) 666-2184* > > > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 5901 (20110223) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 5901 (20110223) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.872 / Virus Database: 271.1.1/3461 - Release Date: 02/22/11 14:34:00 > -- *Joe DeMers - owner* Sound Marine Diesel LLC SoundMarineDiesel.com <http://www.soundmarinediesel.com/> *phone & fax (860) 666-2184*

I hope you always welcome another viewpoint but I have had a Martec on Papoose for about 10 years. I did have vibration and was told to service the prop but I aligned the engine instead and the vibration went away. I have never had any of the dreaded problems of one blade opening. In fact, thinking about it with all the force generated by the rotation of the prop, it is hard to imagine them not opening all the way. By the way, the prop is a Mark I and is probably 45 years old. It was not on the boat that long. probably only around 15 to 20 years. That said, Papoose doesn't back up at all and I almost never go any great distance under power. Reverse is only for stopping the boat. But that was the same for the 10 years I had a fixed 3 blade prop on the boat. I was thrilled the first day I sailed with the Martec on as the boat was noticeably faster. Anyway, want 10 different opinions? Ask 10 sailors the same question. Allen On Wed, Feb 23, 2011 at 5:16 PM, Joe DeMers <je… [at] mindspring.com> wrote: > > > Martec props are strictly for racing. If you don't mind *very inefficient*powering [ especially in astern ] then you should buy a Martec. Gori props > are *FAR superior* for cruising or racing boats. Here's why - > > Gori prop blades are geared together. Therefore, they always open the same > amount, and can never cause a shaft imbalance with the resulting vibration. > Martec prop blades operate independently of each other, and commonly cause > vibration. An added benefit of Gori's geared together design, is that it is > self cleaning. > > Gori blades have a large blade area. This results in very efficient > powering in ahead, AND astern. They are superior in every way when compared > to a fixed blade prop. > > Note that all feathering props [ such as Maxprop ] MUST USE flat blades > with no camber [ no twist ] . Have you ever seen an aircraft prop blade > that's perfectly flat? They don't exist, because of the high inefficiency of > that design. This is why a folding prop that has camber will always produce > more thrust than any flat bladed prop. > > The Gori 3 blade folder has a unique feature. It can be shifted into > "overdrive". When the sea is calm, the overdrive can be used to drive the > boat to hull speed with reduced engine RPM. This saves fuel, noise, and wear > and tear on the entire drivetrain. > > The above reasons are why I am a Gori prop dealer. > > Joe D > > On 2/23/2011 4:36 PM, Mark Alan Stahnke (MAS Consulting) wrote: > > What about a martec folding? > > ----- Original Message ----- > *From:* wirelessmonster <ri… [at] richardanderson.net> > *To:* Ca… [at] yahoogroups.com > *Sent:* Wednesday, February 23, 2011 1:13 PM > *Subject:* [Cal_Boats] Re: Re-powering Cal 31 - Propeller > recommendation/experience > > > > Max, > > Welcome to the group, I hope you get the answers you need on your prop > options.. I will second Joe's comments on the folding props. We have a 2 > blade Gori folding prop on our Cal 29 and we love it. > > Richard Anderson > > --- In Ca… [at] yahoogroups.com, Joe DeMers <jedsail@...> <jedsail@...>wrote: > > > > Campbell sailor props are very inefficient. The blades have minimal > > area, and are quite thick. They are too much of a compromise between > > minimal drag under sail, and efficient powering. > > > > Much better is to install a 2 blade prop with large blade area. Less > > money, and an excellent compromise between a standard 2 blade and a > > standard 3 blade prop. [ most of the thrust of a 3 blade, but less drag > > and cost ] > > > > If you can afford it, a 2 blade folding prop [ Gori, Flex O Fold, etc ] > > is fabulous under power, particularly in astern, with extreme low drag > > under sail. > > > > *Joe DeMers - owner* > > > > Sound Marine Diesel LLC > > > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > > > *phone & fax (860) 666-2184* > > > > > > On 2/22/2011 1:00 PM, max.kloster wrote: > > > Hi > > > I'm new to the group and to a 1979 Cal 31. > > > > > > I'm tired of repairing an old Volvo MD7A and will re-power with a > Yanmar 3YM30. > > > I'm considering a Campbell Sailor CS3RH14x10 > > > > > > I'm looking for advise from Cal sailors on the new propeller. > > > > > > Thanks > > > > > > Max > > > > > > > > > > > > ------------------------------------ > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > No virus found in this incoming message. > > > Checked by AVG - www.avg.com > > > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: > 02/22/11 02:34:00 > > > > > > > -- > > > > *Joe DeMers - owner* > > > > Sound Marine Diesel LLC > > > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > > > *phone & fax (860) 666-2184* > > > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 5901 (20110223) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 5901 (20110223) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.872 / Virus Database: 271.1.1/3461 - Release Date: 02/22/11 14:34:00 > > > > -- > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* > > >

Hi I have a Gori prop on.my 27-3 and Joe is on target with his review of this subject. Jim Carroll The mary g. Cal 27-3 Sent via DROID on Verizon Wireless From: Joe DeMers <je… [at] mindspring.com> To: Ca… [at] yahoogroups.com Sent: Thu, Feb 24, 2011 01:16:03 GMT+00:00 Subject: [Cal_Boats] Martec vrs Gori props [ was Re: Re-powering Cal 31 - Propeller recommendation/experience Martec props are strictly for racing. If you don't mind _very inefficient_ powering [ especially in astern ] then you should buy a Martec. Gori props are _FAR superior_ for cruising or racing boats. Here's why - Gori prop blades are geared together. Therefore, they always open the same amount, and can never cause a shaft imbalance with the resulting vibration. Martec prop blades operate independently of each other, and commonly cause vibration. An added benefit of Gori's geared together design, is that it is self cleaning. Gori blades have a large blade area. This results in very efficient powering in ahead, AND astern. They are superior in every way when compared to a fixed blade prop. Note that all feathering props [ such as Maxprop ] MUST USE flat blades with no camber [ no twist ] . Have you ever seen an aircraft prop blade that's perfectly flat? They don't exist, because of the high inefficiency of that design. This is why a folding prop that has camber will always produce more thrust than any flat bladed prop. The Gori 3 blade folder has a unique feature. It can be shifted into "overdrive". When the sea is calm, the overdrive can be used to drive the boat to hull speed with reduced engine RPM. This saves fuel, noise, and wear and tear on the entire drivetrain. The above reasons are why I am a Gori prop dealer. Joe D On 2/23/2011 4:36 PM, Mark Alan Stahnke (MAS Consulting) wrote: > > > What about a martec folding? > > ----- Original Message ----

Maties if U go on Martec site you will see they make geared two and three blade, elliptic, and three blade feathering props as well. They have gone several generatons paste their original prop. But if you are looking for a cheap folding prop you'll likely find one on Craig's List that is an old martec, if you lay in wait. There is one here for 250 papishkies. I know the old ones you had to align your shaft to prevent one blade from hanging down while racing, a pain in the bilge. Jerry --- On Wed, 2/23/11, ma… [at] yahoo.com <ma… [at] yahoo.com> wrote: From: ma… [at] yahoo.com <ma… [at] yahoo.com> Subject: Re: [Cal_Boats] Martec vrs Gori props [ was Re: Re-powering Cal 31 - Propeller recommendation/experience To: Ca… [at] yahoogroups.com Date: Wednesday, February 23, 2011, 8:48 PM Hi I have a Gori prop on.my 27-3 and Joe is on target with his review of this subject. Jim Carroll The mary g. Cal 27-3 Sent via DROID on Verizon Wireless From: Joe DeMers <je… [at] mindspring.com> To: Ca… [at] yahoogroups.com Sent: Thu, Feb 24, 2011 01:16:03 GMT+00:00 Subject: [Cal_Boats] Martec vrs Gori props [ was Re: Re-powering Cal 31 - Propeller recommendation/experience Martec props are strictly for racing. If you don't mind very inefficient powering [ especially in astern ] then you should buy a Martec. Gori props are FAR superior for cruising or racing boats. Here's why - Gori prop blades are geared together. Therefore, they always open the same amount, and can never cause a shaft imbalance with the resulting vibration. Martec prop blades operate independently of each other, and commonly cause vibration. An added benefit of Gori's geared together design, is that it is self cleaning. Gori blades have a large blade area. This results in very efficient powering in ahead, AND astern. They are superior in every way when compared to a fixed blade prop. Note that all feathering props [ such as Maxprop ] MUST USE flat blades with no camber [ no twist ] . Have you ever seen an aircraft prop blade that's perfectly flat? They don't exist, because of the high inefficiency of that design. This is why a folding prop that has camber will always produce more thrust than any flat bladed prop. The Gori 3 blade folder has a unique feature. It can be shifted into "overdrive". When the sea is calm, the overdrive can be used to drive the boat to hull speed with reduced engine RPM. This saves fuel, noise, and wear and tear on the entire drivetrain. The above reasons are why I am a Gori prop dealer. Joe D On 2/23/2011 4:36 PM, Mark Alan Stahnke (MAS Consulting) wrote: What about a martec folding? ----- Original Message ----- From: wirelessmonster To: Ca… [at] yahoogroups.com Sent: Wednesday, February 23, 2011 1:13 PM Subject: [Cal_Boats] Re: Re-powering Cal 31 - Propeller recommendation/experience Max, Welcome to the group, I hope you get the answers you need on your prop options.. I will second Joe's comments on the folding props. We have a 2 blade Gori folding prop on our Cal 29 and we love it. Richard Anderson --- In Ca… [at] yahoogroups.com, Joe DeMers <jedsail@...> wrote: > > Campbell sailor props are very inefficient. The blades have minimal > area, and are quite thick. They are too much of a compromise between > minimal drag under sail, and efficient powering. > > Much better is to install a 2 blade prop with large blade area. Less > money, and an excellent compromise between a standard 2 blade and a > standard 3 blade prop. [ most of the thrust of a 3 blade, but less drag > and cost ] > > If you can afford it, a 2 blade folding prop [ Gori, Flex O Fold, etc ] > is fabulous under power, particularly in astern, with extreme low drag > under sail. > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* > > > On 2/22/2011 1:00 PM, max.kloster wrote: > > Hi > > I'm new to the group and to a 1979 Cal 31. > > > > I'm tired of repairing an old Volvo MD7A and will re-power with a Yanmar 3YM30. > > I'm considering a Campbell Sailor CS3RH14x10 > > > > I'm looking for advise from Cal sailors on the new propeller. > > > > Thanks > > > > Max > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > > > > > No virus found in this incoming message. > > Checked by AVG - www.avg.com > > Version: 9.0.872 / Virus Database: 271.1.1/3459 - Release Date: 02/22/11 02:34:00 > > > > -- > > *Joe DeMers - owner* > > Sound Marine Diesel LLC > > SoundMarineDiesel.com <http://www.soundmarinediesel.com/> > > *phone & fax (860) 666-2184* > __________ Information from ESET NOD32 Antivirus, version of virus signature database 5901 (20110223) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 5901 (20110223) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.872 / Virus Database: 271.1.1/3461 - Release Date: 02/22/11 14:34:00 -- Joe DeMers - owner Sound Marine Diesel LLC SoundMarineDiesel.com phone & fax (860) 666-2184