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Old 25 November 2015, 04:27   #11
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Country: Australia
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Would both of these motors pull a 90kg adult out of the water on a wakeboard?
I am assuming the 2 stroke will do it with less effort but if the 100 4 stroke will do it too I am leaning towards that just for the quiet factor.
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Old 25 November 2015, 06:15   #12
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Country: Australia
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I've just sold a 5m Haines signature with the latest 90 Suzuki 4stroke and while I really like that engine I doubt you will only see 40 knots towing it behind the car. With a 13.5x 17 pitch stainless prop I could only achieve 29kts.

The Suzuki's are great motors and with the weather we get most of the time a 90 may be enough pitched right as 20 knots is about all you will be able to achieve due to the weather.

I'm originally from the UK where I spent most of my life on boats commercially and recreational. After moving out here I soon found the conditions to be way different from back home (much rougher often big waves on very big ground swells as you would already know).

Out here we tend to power for the max hp so we can keep the power when doing those long trips home where you get bogged down among the swells. Smaller pitched props will help get that immediate power when you need it but you will often lose that top end speed when using them.

My currant rib has a 13x13.5 pitch prop to work bar crossings where up in QLD the same outfits are fitted with 13.5x17.

Maybe a Yam 100 or 115 would do the job. Are you after new or secondhand?

Suzuki and Yamaha have performance tests with many different Aus boats giving fuel and economy throughout the full rpm range.

Jon
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Old 25 November 2015, 07:31   #13
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Country: UK - England
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Boat name: Pegasus
Make: Zodiac Pro 530
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Engine: 115hp Merc 4st
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Who are your nearest dealers? All engines have their followers and loathers but are most new engines are pretty good. If you are looking at 115hp, the merc 4 stroke is the lightest at the moment. I have one and have been impressed. I make about 36kts in my 5.3m zodiac (heavy boat with 2.3m beam and weird 3 hull/chine design). I see 1.1 to 1.3 nm/litre when averaging 20ish kts.

Phil M
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Old 25 November 2015, 16:18   #14
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Over here Yamaha and Suzuki are top sellers. Our state alone has over 250,000 registered (licenced) boat owners. There was a short time when some of the modern 2 strokes were popular but soon lost their credebility especially within the commercial sector (police, maritime, fisheries, water taxis, oyster farmers etc etc). Do your home work on those if you get an offer you think good, they don't have the same reputation they get in the UK.

There are a few places in Sydney that sell ex government engines, mostly about 3 years old. These engine tend to of been serviced every 50hrs (I think Buxton marine was one).

When people talk about one engine being a few kg lighter than another I personally don't think this makes hardly any difference at all especially on a 5m+ rib. Nobody seems to consider we are different weight, you might have someone 50kg heavier than someone else. An extra 2 bags of ice in the esky or a couple of dive tanks in the back. I often have a 100lt tank at the back of mine for keeping live bait or collecting fish (under permit) for a south coast equarium.
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Old 25 November 2015, 16:37   #15
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Country: UK - Scotland
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The weight does matter within reason as said.

The boat may not have a lot of freeboard or already stern heavy etc so anything you can get off the transom weight wise will help.

However, if it is a few kilos, and it is still under rated specs then should be okay, it completely is down to the actual RIB though.
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Old 26 November 2015, 10:07   #16
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Country: UK - England
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Quote:
Originally Posted by dubrus View Post
a friend of mine has that same engine (2010 model) on a northcraft 6m and it will just shade 40mph with a downhill wind, it has 2 single seats/70l tank so a VERY light boat, that is not a "commercial spec" boat either, he is circa 0.6 litres per mile, which is similar to my old avon 5.6.

the gauge has to be over reading for speed. was it the water pickup in the engine you were using per chance?

i found a report on a ribquest 5.8 with 115 yam 4 stroke and it was 38 knots on GPS.

something doesn't add up, you shouldn't have sold it if those were the numbers!
yea water pick up/ pneumo gauge dont know how accurate suzuki guages are but we have pneumo's for reading diver depth which are + or- 0.1% i am only going by that certantly seemed that speed passing fixed objects if you give 10% discrepency thats 40.5 mph as they do with vehicle speedo's, i spent a lot of time setting it up balance,weight distribution,polished hull, proping & trim easy kept up with everyone at easedale RR with bigger boats & hp, i do know some with 150hp burnt nearly twice the fuel than me.fuel wise i never ran at WOT for long no point for me i want to see the area, on long distance i would keep it at 20-25 mph lot better fuel economy that i do know going round jura [conditions perfect] gps is not accurate all the time i have just spent 3 days looking for land based structures gps is 150m out on fixed coordinates at the minuet possibly due to the current climate.
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