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Old 22 March 2009, 14:38   #11
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Country: UK - England
Town: Knutsford
Boat name: Red Jelly
Make: Narwhall 520
Length: 5m +
Engine: 1998 Mariner 75hp
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I think its probably that extra length meaning you can move the console etc that little bit further forward !

This boat, as I've said is fine with a light load but unfortunatley it is mainly used with heavy loads and want to improve the 0-plane time!

The owner of the boat seems pretty keen on doing the bow ballast thing !

Any breif ideas on prices 4 the volvo tabs above, I've fitted them but don't know there value lol!

Cheers again !
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Old 22 March 2009, 14:42   #12
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Will, the other thing re props you could if you wish quick hole shot is to fit a skiers prop like the high five or equivalent.
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Old 22 March 2009, 14:50   #13
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Why add MORE weight! Try out the other suggestions before trying to push more kg's through the water!!!!!
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Old 22 March 2009, 15:17   #14
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Before he adds a couple of hundred weight of concrete in the sharp end, has he checked to see if there is any water in the hull? and does he trim the engine in before hitting the go faster lever?

Pete
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Old 23 March 2009, 08:30   #15
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Make: Ribtec 585
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My Ribtect 585, 115 Merc 4 stroke is pretty similar and i have the same issue - mainly because the console is so far back.

I fited doel fins and they have made an improvement, especially when travelling slowly when it wanders round less. It planes easier, is more stable and trims out way better.

I'd defintely try tabs/fins on a similar boat, i'm sure you'll find some improvement.
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Old 23 March 2009, 08:45   #16
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In my valiant 5.20 with suzuki 70, the console is located nearer the back of the boat than the front... when the engine is trimmed right up... and you going flat out its really unstable if you do a sharp turn left to right and then right to left like that? or when i go over big waves and get air I always try and trim the engine down so it keeps the bow down! Im thinking about putting my anchor, chain + rope ina bucket in the anchor locker... dono if it will make any difference though??
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Old 23 March 2009, 08:48   #17
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Ballast tank?

Hi Will,

Once you've checked all the stuff that others have suggested - props, water trapped, fuel etc and if you decide that more weight forward is the only answer would it not be best to achieve this with a ballast tank forward. This can then be filled when needed and emptied when not. Special transom fitting and a bit of pipework and you're done. Sort of - but you're a boat builder so you know what I mean!
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Old 23 March 2009, 16:46   #18
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have 585 with 115, had same prob, just change prop/ get something bit smaller you'll lose top end but will get up faster and keep bow down.you won't believe the dif. i just switch back if going cruising with no weight
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Old 24 March 2009, 12:56   #19
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I have a stern heavy Tohatsu 6.1 with a 150 opt plus aux and a-frame. I can either do 8 knots or 16 but nothing in the middle. I'm going to give these Smart tabs a try. I'll let you know how I get on with them in 2 weeks or so.

I have tried to weight the bow and there's no water in the bilges so I think its worth a try.

richard
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Old 24 March 2009, 16:45   #20
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Ok, cheers guys!

Gonna show the owner the ideas now and see what he thinks! I feel slightly embarrased lol, i like to think im pretty knowledgable about making boats quicker lol and all I came up with was sand ballast in the anchor locker or prop!

By the way, pretty sure there's no water in the boat! getting her weighed soon to see lol!
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