I will be repacing my outboard soon and was wanting to know what H.P. is recommended? I want to use 4 stroke but should I use long or short shaft? Also is there a good place to order one? Thanks Don
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T
Tim
Honda
I can't give any recommendations for size, but I have an 10 year old Honda 9.9 hp four stroke thats never given me any problems and pushes me along at 6 knots, but drinks about a gallon of gas an hour. It's more HP than you need, but it's nice to have if you have to get back to the slip faster. It's a long shaft and my motor mount is set up for a regular outboard, so it doesn't tilt high enough to get it completely out of the water. Some day I will move the motor mount up, it just hasn't made it that high on my priority list yet. Maybe the next time I have to scrape barnacles off the prop. Good luck, Tim
I can't give any recommendations for size, but I have an 10 year old Honda 9.9 hp four stroke thats never given me any problems and pushes me along at 6 knots, but drinks about a gallon of gas an hour. It's more HP than you need, but it's nice to have if you have to get back to the slip faster. It's a long shaft and my motor mount is set up for a regular outboard, so it doesn't tilt high enough to get it completely out of the water. Some day I will move the motor mount up, it just hasn't made it that high on my priority list yet. Maybe the next time I have to scrape barnacles off the prop. Good luck, Tim
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Mark Melchior
Honda 5hp
I own a Catalina 250 which is much heavier than a C22 (mine displaces almost 4500 lbs). I use a Honda 9.9 XLS and a friend of mine uses a Honda 8 which still pushes his boat at hull speed. I would think a Honda 5 would work well for you depending upon your area conditions (wind, current, etc.)
I own a Catalina 250 which is much heavier than a C22 (mine displaces almost 4500 lbs). I use a Honda 9.9 XLS and a friend of mine uses a Honda 8 which still pushes his boat at hull speed. I would think a Honda 5 would work well for you depending upon your area conditions (wind, current, etc.)
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Clyde
General Rules of "Thumb" for estimating Hp
Here are some general sailing calculations to calculate the horse power required for a generic sailboat, these calculations are based on theoretical conditions (i.e., no current, wind resistance, drag, 100% efficiency, etc.) and should be used for comparison purposes only. Hull Speed Formula Determines the theoretical boat speed for a displacement hull shape. This formula assumes that there is no current, no wind resistance and the hull is clean and free of objects that could cause excess drag in the water. Hull Speed = (1.34)*(LWL^1/2) = In Knots Horsepower Required for Hull Speed Determines the theoretical horsepower required for a displacement hull shape to reach hull speed. This formula assumes that there is no current, no wind resistance and the hull is clean and free of objects that could cause excess drag in the water. Horsepower = Displacement/{(150^2 /(Hull Speed^2)} As can be seen from this equation doubling the speed requires 4 times the horsepower. Maximum Boat Speed for a Propeller As a propeller turns, its pitch determines how far it travels through the water. No propeller is 100% efficient so that in reality it "slips" by moving water aside rather than straight backward. For a planing hull shape, this propeller slip can be as low as 10%. For a displacement hull shape with a high speed propeller, this slip is usually around 45%. This means that the maximum vessel speed is a function of the shaft speed in revolutions per minute, the pitch of the propeller, and the amount of propeller slip. Assuming no propeller slip, the maximum boat speed will be: Boat Speed = (RPM * 60 * Pitch)/72913.2 = In Knots If the propeller slip is 45% then the propeller's forward motion is 55% utilized so the maximum speed for this combination would be: Boat Speed = {(RPM * 60 * Pitch)/72913.2}* 0.55 = In Knots However, since the maximum boat speed is the theoretical boat speed for a displacement hull shape, the propeller will function with an inefficient slip. As a general rule, if you purchase a typical motor for use on a sailboat, you should instruct the dealer to provide the lowest pitch and largest diameter propeller possible consistent with the motor's designed operating speed and horsepower. The "standard" propellers provided with these motors will just not be efficient with a small sailboat since most "standard" propellers are designed to be used by planing hull shape boats(power boats). Either you will be running at 1/2 throttle and therefore never use all the available horsepower, or you will be running at full throttle and wasting the energy in propeller slip. Hope this infomation helps. Smooth sailing Clyde
Here are some general sailing calculations to calculate the horse power required for a generic sailboat, these calculations are based on theoretical conditions (i.e., no current, wind resistance, drag, 100% efficiency, etc.) and should be used for comparison purposes only. Hull Speed Formula Determines the theoretical boat speed for a displacement hull shape. This formula assumes that there is no current, no wind resistance and the hull is clean and free of objects that could cause excess drag in the water. Hull Speed = (1.34)*(LWL^1/2) = In Knots Horsepower Required for Hull Speed Determines the theoretical horsepower required for a displacement hull shape to reach hull speed. This formula assumes that there is no current, no wind resistance and the hull is clean and free of objects that could cause excess drag in the water. Horsepower = Displacement/{(150^2 /(Hull Speed^2)} As can be seen from this equation doubling the speed requires 4 times the horsepower. Maximum Boat Speed for a Propeller As a propeller turns, its pitch determines how far it travels through the water. No propeller is 100% efficient so that in reality it "slips" by moving water aside rather than straight backward. For a planing hull shape, this propeller slip can be as low as 10%. For a displacement hull shape with a high speed propeller, this slip is usually around 45%. This means that the maximum vessel speed is a function of the shaft speed in revolutions per minute, the pitch of the propeller, and the amount of propeller slip. Assuming no propeller slip, the maximum boat speed will be: Boat Speed = (RPM * 60 * Pitch)/72913.2 = In Knots If the propeller slip is 45% then the propeller's forward motion is 55% utilized so the maximum speed for this combination would be: Boat Speed = {(RPM * 60 * Pitch)/72913.2}* 0.55 = In Knots However, since the maximum boat speed is the theoretical boat speed for a displacement hull shape, the propeller will function with an inefficient slip. As a general rule, if you purchase a typical motor for use on a sailboat, you should instruct the dealer to provide the lowest pitch and largest diameter propeller possible consistent with the motor's designed operating speed and horsepower. The "standard" propellers provided with these motors will just not be efficient with a small sailboat since most "standard" propellers are designed to be used by planing hull shape boats(power boats). Either you will be running at 1/2 throttle and therefore never use all the available horsepower, or you will be running at full throttle and wasting the energy in propeller slip. Hope this infomation helps. Smooth sailing Clyde
J
Joseph
My motor
I just bought a long shaft 6 horse 4 stroke tohatsu with an extra prop delivered for $1250.00 from www.onlineoutboards.com. delivered to the door, 3 year warranty, no body elses problem, should last 20 years or more.
I just bought a long shaft 6 horse 4 stroke tohatsu with an extra prop delivered for $1250.00 from www.onlineoutboards.com. delivered to the door, 3 year warranty, no body elses problem, should last 20 years or more.
S
steve c
motor 9.9 merk
i just baught a 9.9 merk for my c22 i was going to buy a 5 or 6 horse but wile i was at the store i found out that there is only a 2 pound differince betwine the 9.9 and 5 horse i wanted less weaght but when i found out there is not mutch difrence i went for hourse power that 9.9 pushes the boat at 6.3 nots instanley and all the controls f/r and neturl are on the stick not the side of the motor so far i love the merk i have not had to lean over the side of the boat at all
i just baught a 9.9 merk for my c22 i was going to buy a 5 or 6 horse but wile i was at the store i found out that there is only a 2 pound differince betwine the 9.9 and 5 horse i wanted less weaght but when i found out there is not mutch difrence i went for hourse power that 9.9 pushes the boat at 6.3 nots instanley and all the controls f/r and neturl are on the stick not the side of the motor so far i love the merk i have not had to lean over the side of the boat at all
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