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So what would be a good motor to get to make sure I can do my hull speed on something like Great Lakes?
I was reading different posts, got some ideas, don't want to go overboard, but I want to be able to do my hull speed (5.5kts?) even in 2-3 footers (if possible).
I'm thinking and looking at 4 HP 4 strokes like Nissan or Mercury, they seem to be the same engine but I like Mercury better for some reason.
Few more questions, what my fuel consumtion is going to be like?
Being new to sailing, I'm I correct to assume sailing is pretty much limited to 5.5 kts or is it possible to go a little faster?
The Nissan, Tohatsu and Mercury are actually all the same engine, all made by Tohatsu IIRC. Fuel consumption really depends on the speed you're running the boat at. Most sailboats are going to be limited to their hull speed, which in the case of a boat with a 17' LWL is going to be about the 5.5 knots you mention—anything faster than that will take a considerable increase in power and run the fuel consumption rate through the ceiling.
The biggest problem you'll probably have, especially in 2-3 foot or heavier seas is the outboard's prop coming out of the water and ventilating... Makes the outboard pretty useless. Make sure you get a long shaft or extra long shaft model.
Makes sense, thanks for the tip.
Do you know if I can buy a carb from a delaer or is that only DIY option
Do you think I can hit my hull speed with 4hp 1600lbs + 500 in people and gear?
A little more expensive, a little heaver but two cylinders.
Waaay smother.
I have two.
One a Honda 7.5hp four stroke and a 8hp Yamaha two stroke.
Either one will move my Mac-25 at over 6 knts. at less than 3/4 throttle.
My boats happy speed is about 5 knts. or about 1/2 throttle on either engine and at that speed both burn about 1/2 gallon an hour.
I prefer the two stroke because no matter how hard I try and no matter what position I place the four stroke in the truck when trailering it still leaks oil.
Some of the lakes no longer allow 2 strokes so I drain the 4 stroke of oil and refill at the lake and drain again at the lake. No big deal it only takes about a quart it is just a pita.
The boat must weight around 3,000 lbs. when loaded.
A Mac 25 is a much bigger boat. A 7.5 HP or 8 HP four stroke is an awful lot of weight to be hanging off the transom of a 19' sailboat. I would highly recommend checking with the outboard motor mount's manufacturer, if you know who made it, and see what the specifications for it are. Many were designed for the much lighter weight two-stroke outboards, and will generally need you to downsize the engine if it is a four-stroke, since they're often considerably heavier than their two-stroke counterparts.
Funny you should say that Dawg.. our little Hartley has a Johnson 7.5 that has been with the boat since the early 80's. Better not say that too loud - it might get upset!!
There is an article in the latest edition of Australian Sailing on this very topic and a few of us have had exactly this discussion to work out the smallest permissible outboard for the TS18 Class. The guidelines we were working to (from the Racing Rules) talk, not just about hull speed, but about maintaining hull speed into a 12kt breeze for 3 hours.
The end result was that, for an 18-20' boat, even though you could probably get to hull speed with a 2hp going flat-out, the smallest outboard you should have is a modern 3.5hp or old 4hp with around 15 litres (whatever that is in your currency) in fuel.
Remember: Outboards work best at 3/4-full throttle, so getting a big one is not necessarily better.
If money isn't the issue go with the 6hp, you won't have to run it at full throttle most of the time which increases engine life over a 4hp running full out. It'll also be quieter.
Just because the mount is for a 10hp doesn't mean your boats transom is designed to hang a 10hp there - you are wise to stay low or at least to look up the specifications prior to buying any engine. Then once you know the weight and thrust limitations go shopping from there.
The 4 would be pushing it's limit at a 2000 lb load. Depending on your expectations that might be enough. Personally I am a believer in more hp for the same weight and as you are at the max limit for what a 4 can do ( 1 hp for 500 lb )....The 6 is almost certainly the better choice. Carburetors are available from any dealer that you get the engine through. It actually costs less to get the 4 and buy the 6 carb than to buy the 6. However, the 4 has an integral tank where as the 5 and 6 have a seperate fuel tank and line. I don't think you would be wrong to go either way if you choose to go Tohatsu/Nissan/Mercury.
The main factor I've found in choosing an outboard is its weight. For security reasons I have to lift the o/b off the transome, of my 20ft loa Sea Wych, and store it in the cabin! This can be quite an interesting operation/spectacle!....in the choppy Thames estuary off Britain's east coast. Hitherto, I had a Seagull Kingfisher 6hp 2 stroke (long shaft) for say 3 hours continuous motoring against a foul tide. I'm considering now, as earlier posts suggest, buying a 4 stroke 6hp for reliability, but what is the weight premium over an equivalent lighter 2 stroke? Also max (4 stroke) full fuel tank duration?
Cheers BS London UK
http:journals.aol.co.uk/spcdesign/BargainIssue
I used to own an MFG 19 for 8 years and tried a 4hp Merc, it felt ok if you are on a small sheltered lake with no waves and limited winds. I stayed with the 6hp Johnson as it was far more suited power-wise to the boat especially if you have any more than one person on the boat. Being on Lake Ontario we often had some waves and wind to deal with. I only had the short shaft which I would not recommend on a larger lake where you may experience waves of any significant size. As previously mentioned definitely go for a long shaft. If you plan on putting more than two people with gear an 8hp long shaft would be very nice to have but it can get more costly to initially purchase. As for fuel consumption the 6hp johnson was better then the 4hp Merc. I did quite a bit of trolling around on the motor and a 30L tank was way more than you would need for typical use in one season. I ended up with 10-15L of fuel at the end of each season which I would then use in my lawnmower/snowblower.
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