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Old 09 October 2013, 18:02   #1
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Country: UK - England
Town: Looe/Fowey
Make: Honwave 4.0
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Honwave 4m splashing in to boat

Hi I have a honwave 4 with a 20hp 4 stroke mariner and i love the set-up ,it does around 20 mph is great in the rough stuff and very stable, you can walk around it with almost no movement.I have carried seven including myself with ease.With launching wheels pulling up the beach and slipway makes it a much easier proposition than my old Eurosport 15 with a 90 2 stroke and I think just as much fun.
Anyway at full speed the water that is thrown from the leg on to the tubes and in to the boat really annoys me. the mariner has an incompatible design with the honwave due to the gearbox bolts on show below the splash plate being in direct line with the relieved water coming from the base of the transom splashing up ,on a deep v hull this wouldn't happen but the honwave has a flat bottom.
Due to the low inflatable keel raising the engine to move the bolts out of the line of fire causes cavitation even at best trim and that's only raising the engine 15mm,set on the original position the splash plate is about 10mm above the water at full speed.
has anyone else had this problem or worked out how to fix this on a honwave?
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Old 10 October 2013, 10:50   #2
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Hi

not seen that problem with the Tohatsu ( same engine) so do you have a pic or video? if this is a problem it would be great to know more so we can steer people away from that set up.

Dave
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Old 10 October 2013, 17:26   #3
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Yes I'll dig it out, the problem increases if the keel is not perfectly inline or if you sit on the tubes rather than a central location ( I like the package for its price it's still very capable and has a good smile factor)
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Old 13 October 2013, 13:18   #4
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It's not easy taking pics by yourself on the go LOL
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Old 13 October 2013, 16:19   #5
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I have considered fitting a Perspex spray deflector at the base of the transom reaching out to just shy of the engine to keep the flow from the base.of the transom at a low level
The self bailer is smack in the middle of any deflector I may fit
Has anyone tried this
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Old 14 October 2013, 16:01   #6
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Also i thought about enlarging the splash plate on the outboard to stop splashes hitting the bits above the spray plate and getting everywhere.
Most worrying though is all that spray finds its way up in to the engine bay through the drain holes
out comes the ani rot spray
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Old 14 October 2013, 17:27   #7
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With well inflated keeel & tubes to min 3.0 psi, that's with gauge and engine trimmed at 90 raise engine accordingly with wooden shims untill water flow skims under small upper water deflector plate as in this example with same 20 HP engine.-



You're currently experimenting out or over transom splahes at wot ?

Happy Boating
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Old 14 October 2013, 18:48   #8
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Splashes spray on to side tubes not over transom
My outboard looks the same at wot but because the tubes are in the way of the circular spray pattern from the deflector plate they catch the spray also in the video the water is directed cleanly from the transom but the stream of water from the honwave is messier and more upward
I tried raising the engine at different levels with little results but plenty of cavitation
The keel upsets the water and is significantly lower than the transom???
Thanks for you help so far
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Old 15 October 2013, 15:56   #9
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Mercury make a spray deflector to stop this problem, but they arnt that cheap and i would have to screw it on to the transom,
if it doesn't perform i will end up with screw holes to repair
HAS ANYONE TRIED THE MERCURY BRANDED TRANSOM MOUNTED SPRAY DEFLECTOR,Is it any good
Thanks for looking
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Old 15 October 2013, 18:53   #10
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you shouldn't need a deflector, it sounds as if you need to check the height of engine, as Loco has mentioned trial and error on the height of the engine.
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