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Old 14 July 2016, 10:44   #1
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Country: USA
Town: Northern Alabama, USA
Boat name: Fire Fly
Make: Dong Seo
Length: 3m +
Engine: Tohatsu 9.8
Join Date: May 2013
Posts: 52
Hydrofoil Question

I have an Azzurro 11' dink with a Tohatsu 9.8 O/B.
I normally just have 2 adults including myself in the dink and it runs and planes just fine. With more than that, it will take a while to plane or sometimes not at all.

Which style Hydrofoil, make, model etc would be best for me?

Thanks in advance
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Old 14 July 2016, 13:40   #2
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Country: UK - England
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Make: Mercury
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Do you try and throw the weight forward until it planes it makes a lot of difference.
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Old 14 July 2016, 14:05   #3
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Country: USA
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Yes I know, thanks, but the Admiral wants the forward seat installed and that restricts my movement. When alone, I ride sitting on the tube - much easier to shift my weight.
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Old 14 July 2016, 14:34   #4
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Possible that the weight & position of load means that it won't plane no matter what hydrofoil you fit.
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Old 14 July 2016, 14:45   #5
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Country: USA
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Length: 3m +
Engine: Tohatsu 9.8
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With 2 people, 5 lbs of stuff, 50 lbs of gas+tank and 85 lbs of motor, I do just fine.
Someone recommended the hydrofoil idea for increased performance. Cheap as they are, I was wondering which was a decent model at a reasonable price and what are the advantages/disadvantages of the different styles?

I am located in the US in the state of Alabama.

Thanks for the input so far.
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Old 14 July 2016, 16:44   #6
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Country: UK - England
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Had a Permatrim on mine - on a 17' dory - for years.
Comes on plane sooner & stays on plane at lower throttle opening so quite an improvement in fuel consumption which was the reason for fitting it in the first place.
It's a big aluminium plate bolted onto the cavitation plate so I expect something similar wouldn't be that difficult to make.
https://www.permatrims.com/ AFAIAC it does what it says in the blurb.

But as I said earlier, regardless of power etc there comes a point where the weight & position of the load is just too much for the engine.
A case in point was the 'go-bang' for outboards at an annual regatta I attend. Idea is to set off at full throttle from the start & then, when a flare is set off to turn round & come back at the same throttle setting. One year one boat was loaded with passengers who all stayed at the back of the boat, which unsurprisingly was very bow high & wouldn't plane. At the signal the passengers all distributed themselves properly, boat went on the plane & was first across the finish line. Disqualified for blatant gamesmanship.
I should add that it's all in fun, nearly everybody cheats & the winner is usually one of the displacement hulls who can't get far enough away from the committee boat in the time allowed to avoid detection
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Old 15 July 2016, 03:00   #7
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Country: UK - England
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Join Date: Oct 2011
Posts: 2,764
only my opinion but i had one once and didn't see any difference not saying they dont work just didn't seem it had any effect and if they were that good why does the engine manufactures not design the cav plate in that way. suppose to make you buy the next hp up?
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