Hi Guys, I'm in need of a little info ... again. My 25" shaft O/B died and I need to find another. I may not need a 25" (Hen's teeth in the Desert), maybe a 20" would do (rare but not so rare), but I'm not sure. My guess is the prop should extend past the bottom of the boat, but how much ? Problem is the boat is in Mexico 6-7 hours away and I need a measurement for the MINIMUM shaft length I can use, when shopping for another. If anyone knows or can measure the distance between the motor mounting bracket and the bottom of the hull of their 22', it would help me lots. I'm signed up for my first Regatta early next month. In case anyone is interested or doesn't know, winter is the sailing season in the Sea of Cortez, cool but not cold. Thanks for any help you can give. High and dry in the desert, Rudy
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M
Mike
Long shafts
For some manufacturers (Nissan and Mercury for example), a 20 inch shaft is the "long shaft" model. I confess I never understood what that measurement refers to (from what point to what point), or if it means the same thing for each manufacturer. In any case, be careful with the measurements from someonelse's boat. Their engine mount might be in a different place than yours. Don't forget that Oday made several different models of the 22, and the bracket location may have changed. Also, I know several people who had to move their outboard engine bracket as a result of buying a new outboard, mostly because their new outboard's tiller/throttle didn't fit the same as their old engine. You should also measure your old engine's tiller to make sure it will fit or operate on your bracket.
For some manufacturers (Nissan and Mercury for example), a 20 inch shaft is the "long shaft" model. I confess I never understood what that measurement refers to (from what point to what point), or if it means the same thing for each manufacturer. In any case, be careful with the measurements from someonelse's boat. Their engine mount might be in a different place than yours. Don't forget that Oday made several different models of the 22, and the bracket location may have changed. Also, I know several people who had to move their outboard engine bracket as a result of buying a new outboard, mostly because their new outboard's tiller/throttle didn't fit the same as their old engine. You should also measure your old engine's tiller to make sure it will fit or operate on your bracket.
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Clay Wright
Here's some numbers
Hi Rudy, Mike has some very good points, but knowing that my 1976 O'day 22 has not been altered from the factory bracket location, I feel comfortable providing you with these measurements which I grabbed off the boat last night. I have a commonplace OMC motor bracket (not original) mounted through the fiberglass wedge which O'day provided to compensate for the reverse angle of the transom. The bracket is bolted through the original transom holes so I know its position has not been changed. With the bracket in the lowered ("engine run") position, the top edge of the wooden plate the motor clamps to is 21 1/2 inches above the wineglass "point" of the transom (where the transom meets the bottom). The measurement from the top edge of the wooden plate to the boat's actual waterline mark is 16 inches. I run an 80's vintage Honda 4-stroke ten horse (I know, I'm way overpowered!) with a "long shaft." From the top inside surface of the transom clamp to the propeller hub, the motor measures 28 inches. This results in a propeller hub depth of 12 inches below the waterline with the bracket in the lowered position. This seems like plenty of immersion as I get no cavitation when the boat is pitching, etc. Maybe you could get by with a little less. I hope this information is helpful. If you need any other measurements please let me know, the boat's just sitting in the backyard. Kinda wish it was in Mexico, as long as I was on it! Clay
Hi Rudy, Mike has some very good points, but knowing that my 1976 O'day 22 has not been altered from the factory bracket location, I feel comfortable providing you with these measurements which I grabbed off the boat last night. I have a commonplace OMC motor bracket (not original) mounted through the fiberglass wedge which O'day provided to compensate for the reverse angle of the transom. The bracket is bolted through the original transom holes so I know its position has not been changed. With the bracket in the lowered ("engine run") position, the top edge of the wooden plate the motor clamps to is 21 1/2 inches above the wineglass "point" of the transom (where the transom meets the bottom). The measurement from the top edge of the wooden plate to the boat's actual waterline mark is 16 inches. I run an 80's vintage Honda 4-stroke ten horse (I know, I'm way overpowered!) with a "long shaft." From the top inside surface of the transom clamp to the propeller hub, the motor measures 28 inches. This results in a propeller hub depth of 12 inches below the waterline with the bracket in the lowered position. This seems like plenty of immersion as I get no cavitation when the boat is pitching, etc. Maybe you could get by with a little less. I hope this information is helpful. If you need any other measurements please let me know, the boat's just sitting in the backyard. Kinda wish it was in Mexico, as long as I was on it! Clay
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Alan Gruber
More Numbers
Rudy: I just measured my 78 o'day 22. It has the original mount which is off-set 17.5" from keel to mount center. I installed a replacement rubber block so it is probably not exactly the same height as original. My motor is a 91 OMC 4hp sailmaster. It hangs dowm 26.5" from top of mount block to prop shaft center. The prop shaft center is 14" below the top of the water line stripe. If our stripes are not in the same place, It is 4" inches below the lowest point of the transom - that v shape where the keel and transom meet. The sailmaster is a longshaft OMC with another 5" extension installed at the plant. It therefore has 2 cavitation plates. It is deep enough in normal water conditions including most choppy water - no cavitation. 4 horses is probable not enough if you are pushing against heavy wind and waves, but it pushes the boat about 5 mph in flat conditions. My original motor was a Merc 7.5 longshaft 20". It was stolen but I wasn't too unhappy because it was too short. In choppy water it cavitated and often died. Mike is right. When I was shopping for another motor, I measured a lot of motors in the stores and they differ in length regardless of what the specs say. My advise - Get an extra long motor 25-27". I recall that Honda's long and extra long shafts where about 1-1.5" longer than the other makers long and extra long shafts. Rudy, I have a question for you. I lived in Tucson during the 70's and like the southwest. I live in cold Wisconsin now, and I am looking for a Marina on the Mexican west coast to winter at. I would trailer the boat seasonally from Wisconsin. Do you off-hand know of a nice place where a 60ish gringo would be comfortable? If you do please respond in these pages or at unga@wi-net.com. I'm also in this sites owner's directory. Thanks - good luck -- Alan Gruber
Rudy: I just measured my 78 o'day 22. It has the original mount which is off-set 17.5" from keel to mount center. I installed a replacement rubber block so it is probably not exactly the same height as original. My motor is a 91 OMC 4hp sailmaster. It hangs dowm 26.5" from top of mount block to prop shaft center. The prop shaft center is 14" below the top of the water line stripe. If our stripes are not in the same place, It is 4" inches below the lowest point of the transom - that v shape where the keel and transom meet. The sailmaster is a longshaft OMC with another 5" extension installed at the plant. It therefore has 2 cavitation plates. It is deep enough in normal water conditions including most choppy water - no cavitation. 4 horses is probable not enough if you are pushing against heavy wind and waves, but it pushes the boat about 5 mph in flat conditions. My original motor was a Merc 7.5 longshaft 20". It was stolen but I wasn't too unhappy because it was too short. In choppy water it cavitated and often died. Mike is right. When I was shopping for another motor, I measured a lot of motors in the stores and they differ in length regardless of what the specs say. My advise - Get an extra long motor 25-27". I recall that Honda's long and extra long shafts where about 1-1.5" longer than the other makers long and extra long shafts. Rudy, I have a question for you. I lived in Tucson during the 70's and like the southwest. I live in cold Wisconsin now, and I am looking for a Marina on the Mexican west coast to winter at. I would trailer the boat seasonally from Wisconsin. Do you off-hand know of a nice place where a 60ish gringo would be comfortable? If you do please respond in these pages or at unga@wi-net.com. I'm also in this sites owner's directory. Thanks - good luck -- Alan Gruber
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Rudy
Thanks you guys are the best
You guys are truly Sailors, thanks for your information, experience, knowledge and help. Now I'm off to look for a motor. Rudy A note to Alan: I only hear stories about the West coast, but if I may recommend you try the Sea of Cortez and San Carlos in perticular, it's pretty Americanized, but different it's Mexico!! There are lots of us gringos, but only a few are pretty rude. My idea is having some sailing fun during the day and if it gets rough get into a safe cove. My charts don't show many on the coast, but there's 30-40 in the San Carlos area. I think the Sea Of Cortez is beautiful (but no trees) and pretty safe as compared to the Ocean. Not that it doesn't get a little rough at times, I've only dragged anchor once, but move a couple hundred yards to a secure spot. If you ever come this way maybe you can show me how to sail my 78 22', I'm a novis. You could try the Sea of Cortez website for more info or E-mail me for specifics. THX Rudy
You guys are truly Sailors, thanks for your information, experience, knowledge and help. Now I'm off to look for a motor. Rudy A note to Alan: I only hear stories about the West coast, but if I may recommend you try the Sea of Cortez and San Carlos in perticular, it's pretty Americanized, but different it's Mexico!! There are lots of us gringos, but only a few are pretty rude. My idea is having some sailing fun during the day and if it gets rough get into a safe cove. My charts don't show many on the coast, but there's 30-40 in the San Carlos area. I think the Sea Of Cortez is beautiful (but no trees) and pretty safe as compared to the Ocean. Not that it doesn't get a little rough at times, I've only dragged anchor once, but move a couple hundred yards to a secure spot. If you ever come this way maybe you can show me how to sail my 78 22', I'm a novis. You could try the Sea of Cortez website for more info or E-mail me for specifics. THX Rudy
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Stu Timm
Longshaft Outboards
Hi Rudy; Definietly go for a 20 inch motor. That number (20") reflects the distance from the bracket to the first cavitation plate (that horizontal fin over the propeller). Long shaft motors for sail boats ususally have two of them, one over the other. They simply add another lower unit filler flange to a 15" shaft motor to make it a long shaft. Honda has a super long shaft unit (that's around 27 inches I think). It's better because it puts the prop lower into deeper water and reduces the chances of the motor freewheeling when the back of the boat pitches in waves. Most importantly, you want to make sure that the cavitation plate(s) are fully immersed because the coolant water intake is usually just below that cavitation plate. It is very important to keep the water flow uninterrupted to the motor. I toasted my motor because of a faulty bracket that allowed air to get into the motor's cooling system. I replaced the bracket with a Gareleck reverse angle bracket rated for 120 pounds. The bracket bolts directly to the transom without using that fiberglass wedge that came woth the boat. By the way, that fiberglass wedge was filled with rotted wood and I removed it promptly! Good Luck Stu Timm
Hi Rudy; Definietly go for a 20 inch motor. That number (20") reflects the distance from the bracket to the first cavitation plate (that horizontal fin over the propeller). Long shaft motors for sail boats ususally have two of them, one over the other. They simply add another lower unit filler flange to a 15" shaft motor to make it a long shaft. Honda has a super long shaft unit (that's around 27 inches I think). It's better because it puts the prop lower into deeper water and reduces the chances of the motor freewheeling when the back of the boat pitches in waves. Most importantly, you want to make sure that the cavitation plate(s) are fully immersed because the coolant water intake is usually just below that cavitation plate. It is very important to keep the water flow uninterrupted to the motor. I toasted my motor because of a faulty bracket that allowed air to get into the motor's cooling system. I replaced the bracket with a Gareleck reverse angle bracket rated for 120 pounds. The bracket bolts directly to the transom without using that fiberglass wedge that came woth the boat. By the way, that fiberglass wedge was filled with rotted wood and I removed it promptly! Good Luck Stu Timm
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