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Props
- Thread starter aurora2
- Start date
Jim
Evening Star is a CM 38. I threw the atomic 4 overboard and installed a Westerbeek 42B. It almost went in switch for switch. I installed a new exhaust system, shaft and cutlass bearings. I had to add sisters to the existing engine mounts and the westerbeek sits on the sisters. It went in fairly easy. The weight of the Westerbeek was just about 50 lbs more than the atomic 4. Two of the major reasons I went with the westerbeek was because of its small size and it was a four, not a three cylinder. I went with 42 instead of 30 something because I am running refrigeration off the engine and a 145 amp alternator.
I read in Practical Sailor about a prop called the Campbell (sic) Sailor prop. They gave it a high rating for drag and performance. It is a three blade prop and it fit in the existing appature. My reverse isn't to good but that is because of the full keel. If you are intrested in this type of prop then e-mail me and I will dig out the info. on it. CaptBobE@aol.com . The prop gives me hull speed under power. I am very impressed with the engine and the prop combination. I let Westerbeek and the salesman from Campbell figure out size and pitch and went with their recomendation.
The whole new engine system and all the parts including the shaft, exhaust, bearings, prop was kind of pricy about $10,000 and I did all the work myself.
If you need more from me e-mail or call (757)363-7381.
I also installed a dripless packing whatever you call it. I'll think of the name for this about 4AM. I am also very pleased with this hodiggy.
Hope I have been some help. Contact me anytime, I am retired.
Truly Capt.Bob
Evening Star is a CM 38. I threw the atomic 4 overboard and installed a Westerbeek 42B. It almost went in switch for switch. I installed a new exhaust system, shaft and cutlass bearings. I had to add sisters to the existing engine mounts and the westerbeek sits on the sisters. It went in fairly easy. The weight of the Westerbeek was just about 50 lbs more than the atomic 4. Two of the major reasons I went with the westerbeek was because of its small size and it was a four, not a three cylinder. I went with 42 instead of 30 something because I am running refrigeration off the engine and a 145 amp alternator.
I read in Practical Sailor about a prop called the Campbell (sic) Sailor prop. They gave it a high rating for drag and performance. It is a three blade prop and it fit in the existing appature. My reverse isn't to good but that is because of the full keel. If you are intrested in this type of prop then e-mail me and I will dig out the info. on it. CaptBobE@aol.com . The prop gives me hull speed under power. I am very impressed with the engine and the prop combination. I let Westerbeek and the salesman from Campbell figure out size and pitch and went with their recomendation.
The whole new engine system and all the parts including the shaft, exhaust, bearings, prop was kind of pricy about $10,000 and I did all the work myself.
If you need more from me e-mail or call (757)363-7381.
I also installed a dripless packing whatever you call it. I'll think of the name for this about 4AM. I am also very pleased with this hodiggy.
Hope I have been some help. Contact me anytime, I am retired.
Truly Capt.Bob
jesse_garman
Jesse Garman
The stock M-382 (1980) with Perkins 4-107 power came with a 16 RH 11 three bladed prop. The 50 HP engine was rated at 3000 RPM and is a good match-up. Regards, Paul Gaskill
I have a Perkins 4108 engine. My boat is a 384. Back in April I had my standard three-bladed 16X11 prop re-pitched to 16X9. The reason was that the max speed I could get out of the engine was 2600, which is far below the Perkins rating. My max RPM is now about 3150. My crusing RPM is now about 1800, whereas befor it was 1500. Fuel consumption is now about .55gph as opposed to .65 prior to the pitch change. The higher RPM will allow the engine to develop higher HP.
<div>Jim,Oconee is a 382 hull No.4. She has a Yanmar 3QM30 and a 16x12 three bladed prop. Max RPM is 2800 and it will reach max. with the 16x12 prop. I cruise the boat at 2100 RPM at about 6.5 knots. Fuel consumption is not so good, about 0.9 of a gallon per hour.Vic C.
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I stayed with the standard 16X11 3 blade on M382 #155 powered with a Perkins 4-108. Max rpm is 2800. At that rpm in smooth water she gets over 7knts. With a reasonalby clean bottom at 2000 rpm we cruise at 6.2 knts. When we get down to 5.7 knts. it is time to clean the bottom.
A few years ago I looked into changing to a two bladed prop.
We were thinking about doing the Bermuda Race and I did not want to drag three blades on a long race. I spoke to a M382 owner (can't think of his name) who changed to a 2 bladed
17X13. He claimed it resulted in a much faster sailing boat, and the same speed under power with just a little cavitation in a heavy sea.
Before I purchased my 382 I charted one (I was between cruising boats and had a daysailor). She had a 3 blade 18X? and would overheat above 1800 rpm, or when run for a long time.
I spoke to several (intellegent) mechanics, including the enginers who proped the Morgan 382 for Morgan. They all stated that it is proped correctly, because it runs at the proper rpm with out over-heating the engine, and if I went for a larger prop I would damage my transmission.
Thats all I can tell you about my research. Right, wrong, or maybe, re-proping is part science and part black art.
A few years ago I looked into changing to a two bladed prop.
We were thinking about doing the Bermuda Race and I did not want to drag three blades on a long race. I spoke to a M382 owner (can't think of his name) who changed to a 2 bladed
17X13. He claimed it resulted in a much faster sailing boat, and the same speed under power with just a little cavitation in a heavy sea.
Before I purchased my 382 I charted one (I was between cruising boats and had a daysailor). She had a 3 blade 18X? and would overheat above 1800 rpm, or when run for a long time.
I spoke to several (intellegent) mechanics, including the enginers who proped the Morgan 382 for Morgan. They all stated that it is proped correctly, because it runs at the proper rpm with out over-heating the engine, and if I went for a larger prop I would damage my transmission.
Thats all I can tell you about my research. Right, wrong, or maybe, re-proping is part science and part black art.
<div>A prop is dependent on the engine. Mine is a Pekins 108-4. There are two designs for these. Low and High rpm. Mine is a high rpm engine, up to 4000 rpm. I have a Hurth 2/1 or so gear box. (By the way, you can find out your engine type by giving Foley in Mass. a call with the serial numbers.) On my boat the proper prop will allow me to reach 3200 rpm and cruise at 6.5 knots at 2500 rpm. I am using a three blade Max Prop set at 18% pitch. It works great. Minimal vibration. Backs up straight!! Sails well.
Very expensive. PYI is the distributor at 425-670-8915. They are helpful. I did spend one summer with this prop set at 22% pitch. It allowed 2500 rpm max. and cruised at 2200 rpm and ran lots of unburned fuel thru and remnants could be found in the oil upon analysis which I do every year. Definitely ungood for this high speed engine.More. I have had the original three blade prop on the boat. It sailed like a pig loosing .5 to 1 knot by direct comparison to Morgans with two blades. I have had a two blade prop which I lined up with the keel to sail well. I designed a magnetically operated reed switch and LED indicator to show me prop position in the cocpit and I caught the prop in position and locked it in position in reverse. Worked well for sailing. This prop was 17X13. Max rpm was 3000 and cruising was 2200 rpm. This was two much prop in retrospect given what I now know of the engine.A two bladed prop will cause some vibration in the skeg opening but it can be lined up with the skeg for sailing. (This is a sail boat rather than a motor boat) If the engine speed is too low maximum power is not developed but worse than that the boat speed is easily knocked down by rough seas. The best answer is three bladed feathering prop of some sort but fitting it in can be tricky.</div>
Very expensive. PYI is the distributor at 425-670-8915. They are helpful. I did spend one summer with this prop set at 22% pitch. It allowed 2500 rpm max. and cruised at 2200 rpm and ran lots of unburned fuel thru and remnants could be found in the oil upon analysis which I do every year. Definitely ungood for this high speed engine.More. I have had the original three blade prop on the boat. It sailed like a pig loosing .5 to 1 knot by direct comparison to Morgans with two blades. I have had a two blade prop which I lined up with the keel to sail well. I designed a magnetically operated reed switch and LED indicator to show me prop position in the cocpit and I caught the prop in position and locked it in position in reverse. Worked well for sailing. This prop was 17X13. Max rpm was 3000 and cruising was 2200 rpm. This was two much prop in retrospect given what I now know of the engine.A two bladed prop will cause some vibration in the skeg opening but it can be lined up with the skeg for sailing. (This is a sail boat rather than a motor boat) If the engine speed is too low maximum power is not developed but worse than that the boat speed is easily knocked down by rough seas. The best answer is three bladed feathering prop of some sort but fitting it in can be tricky.</div>
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