Hi All: I just got a great deal on a used 3.5hp Nissan 2-stroke for my M17. I had a Tohatsu 5 on my previous boat, and it was a super engine... always ran like a charm, except the one time I flooded it. Ran like a charm after ten minutes that day. Since Nissans are made by Tohatsu (I've heard they're basically the same engine) I'm hoping this little one will run well... as well. My question has to do with prop pitch for this outboard. A 3.5HP is a touch small for a 17, so I want to get all the engine performance I can. There is a lower pitch prop available from Nissan that would work better for "moderate to high loads." (the standard prop is 7.4" diameter, 7" pitch, and their optional prop is the same diameter, but with a 5.7" pitch.) I'm wondering if anyone else is using an outboard with a lower-than-standard pitch, and has it helped? Thoughts and opinions? Thanks BG -- Brian Gilbert Marine Media M17 "Tiny Dancer" (ex "Stargazer") (423)876-9990 3404 Hartford Drive Chattanooga, TN 37415 www.sailingsmall.com
Brian: Don't know about your 3.5 hp Nissan, but I have an older Johnson Sailmaster 4 HP. It was setup with the low pitch prop and I would think this would be the best. You are looking for power, not speed. The 4 hp pushes the boat to about 4 knots at around 3/4 throttle and running easy. Wide open will get her up to a little over 5 knots, but by then the motor is running hard and the boat is squatting. And wide open uses twice the fuel for not much more gain in speed. Your 3.5 hp will get you in and out of a slip easy enough. Don't know what it will do in a strong headwind or strong current. If it's just wind, you could always try sailing! Howard M17, #278 Audasea On 6/26/05 9:21 PM, "Brian Gilbert" <hammerguy@mindspring.com> wrote:
Hi All:
I just got a great deal on a used 3.5hp Nissan 2-stroke for my M17. I had a Tohatsu 5 on my previous boat, and it was a super engine... always ran like a charm, except the one time I flooded it. Ran like a charm after ten minutes that day. Since Nissans are made by Tohatsu (I've heard they're basically the same engine) I'm hoping this little one will run well... as well.
My question has to do with prop pitch for this outboard. A 3.5HP is a touch small for a 17, so I want to get all the engine performance I can. There is a lower pitch prop available from Nissan that would work better for "moderate to high loads." (the standard prop is 7.4" diameter, 7" pitch, and their optional prop is the same diameter, but with a 5.7" pitch.) I'm wondering if anyone else is using an outboard with a lower-than-standard pitch, and has it helped? Thoughts and opinions?
Thanks BG
Brian: The lower pitch prop will give you more thrust but at lower speed. You will have to decide if that's what you need. Why not get both props and try them; then use the one you don't like as a spare. --Gary Hyde N24 'Sailabration' M15 #235 'Vanilla' On Jun 26, 2005, at 7:21 PM, Brian Gilbert wrote:
Hi All:
I just got a great deal on a used 3.5hp Nissan 2-stroke for my M17. I had a Tohatsu 5 on my previous boat, and it was a super engine... always ran like a charm, except the one time I flooded it. Ran like a charm after ten minutes that day. Since Nissans are made by Tohatsu (I've heard they're basically the same engine) I'm hoping this little one will run well... as well.
My question has to do with prop pitch for this outboard. A 3.5HP is a touch small for a 17, so I want to get all the engine performance I can. There is a lower pitch prop available from Nissan that would work better for "moderate to high loads." (the standard prop is 7.4" diameter, 7" pitch, and their optional prop is the same diameter, but with a 5.7" pitch.) I'm wondering if anyone else is using an outboard with a lower-than-standard pitch, and has it helped? Thoughts and opinions?
Thanks BG
-- Brian Gilbert Marine Media M17 "Tiny Dancer" (ex "Stargazer") (423)876-9990 3404 Hartford Drive Chattanooga, TN 37415 www.sailingsmall.com
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BuscaBrisas has a 5 hp Honda for aux power. After trying out the standard prop for a while, I decided that the engine was unable to reach full rpm's at full throttle, so I swapped to the lower pitch prop. That helped some, although I think the pitch could have been even lower. This from the archives: "When I bought my Honda a couple years ago, there were two different props for it: 7 7/8 x 7 1/2 and 7 7/8 x 6 3/4. (Diameter x Pitch). The 7 1/2 pitch prop was standard. With it, the engine rpm maxed out at about half-throttle. I bought the 6 3/4 pitch prop after a year and with it the rpm's max out at about 3/4 throttle, so the 6 3/4 pitch prop is a better match between the engine and the load it's pushing and more engine power is being transmitted to the water. That doesn't translate into a particularly noticeable increase in speed since resistance goes up quickly in relation to speed, but it does mean that the boat will be able to power against a stronger headwind. An even lower pitch of, say, 6 1/2 or maybe 6 1/4 for the Honda would have been better" Tod
participants (4)
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Brian Gilbert -
gmhyde1@mac.com -
Howard Audsley -
htmills@bright.net