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Old 27 August 2019, 06:49   #11
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Country: UK - England
Town: Little Easton
Boat name: Cheese
Make: Excel Virago
Length: 4m +
Engine: Outboard Mercury 60H
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Quote:
Originally Posted by lakelandterrier View Post
The centre of gravity may be too far back I had same problem with my 4m Avon.with a 4stroke 40HP
On plane engine should be trimmed up c.halfway

I'd move what weight I can -batttery, fuel, etc. forward & see what effect that has.

Have you considered fitting Doelfins? - I found they made a huge difference.

Think about some ballast in bow as a further option

LT


Thanks LT, really helpful. Iíll try all these tips.
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Old 28 August 2019, 04:14   #12
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Engine: Honda BF225
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I have the same problem with my little 330 rib, 15 hp. All I have to do is send the passenger forward and away it goes
So it's probably a weight problem.
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Old 28 August 2019, 04:28   #13
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not got water in the hull if thats the type of design, it should have a drain plug at the stern
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Old 28 August 2019, 09:16   #14
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I would recommend "automatic" trim tabs, whatever brand you prefer. I have nauticus smarttabs on my rib and without them I can't get on plane with only me. It's too stern heavy.
They are spring loaded so they self retract when you get on plane. They have a chart on their website to fit the right spring strength.
You can also get a kit to manually retract them so they are not in the way for trailering. Sometimes I forget to put them down coming off the trailer and I instantly know whats wrong.
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Old 28 August 2019, 14:37   #15
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I have a 4.2m zodiac pro with Yamaha 40hp 2 stroke. I weigh 85.3kg and the rib pulls me out with ease and that includes 3 adults on board. So not convinced there is a power issue. Like your rib when in harbour it rides very nose high and nose high before going on plane. In my case it’s definitely a weight distribution problem. Mine is back heavy and I bet yours with a 60hp 4 stroke will be too. Move bodies (weight) up front and this significantly reduces the nose up for me. Mine is a jockey seat with anchor spare fuel all up front. 40litres fuel and battery under seat. Still rear Heavy. Apart from adding permanent weight up front (or making people go up front (if they are on boar) until on the plane) the only other solutions/improvements I can see might be the use of the dolphin fins or the auto trim tabs mentioned by others and I haven’t tried either. I’m tempted tho. But your not alone. Good luck.
Bremar
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Old 28 August 2019, 18:09   #16
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Quote:
Originally Posted by jeffstevens763@g View Post
not got water in the hull if thats the type of design, it should have a drain plug at the stern
Definitely worth checking
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Old 29 August 2019, 02:08   #17
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Country: UK - England
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Make: Excel Virago
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Quote:
Originally Posted by Bremar View Post
I have a 4.2m zodiac pro with Yamaha 40hp 2 stroke. I weigh 85.3kg and the rib pulls me out with ease and that includes 3 adults on board. So not convinced there is a power issue. Like your rib when in harbour it rides very nose high and nose high before going on plane. In my case itís definitely a weight distribution problem. Mine is back heavy and I bet yours with a 60hp 4 stroke will be too. Move bodies (weight) up front and this significantly reduces the nose up for me. Mine is a jockey seat with anchor spare fuel all up front. 40litres fuel and battery under seat. Still rear Heavy. Apart from adding permanent weight up front (or making people go up front (if they are on boar) until on the plane) the only other solutions/improvements I can see might be the use of the dolphin fins or the auto trim tabs mentioned by others and I havenít tried either. Iím tempted tho. But your not alone. Good luck.
Bremar


Thanks for replying. I understand and agree. The only thing on your side is the instant power of the 2 stroke. Iím going to try some weight shifting and also the wedges to see if I can use the engine to improve the stern lift. This should also give me some trim when Iím planing as I currently donít have any need to. If that doesnít work Iíll try the fins or tabs. Iíll report back so all who have offered help can read the results if your interested.
Thanks again
Cheeseboat.
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Old 29 August 2019, 02:09   #18
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Quote:
Originally Posted by babbot1 View Post
I would recommend "automatic" trim tabs, whatever brand you prefer. I have nauticus smarttabs on my rib and without them I can't get on plane with only me. It's too stern heavy.
They are spring loaded so they self retract when you get on plane. They have a chart on their website to fit the right spring strength.
You can also get a kit to manually retract them so they are not in the way for trailering. Sometimes I forget to put them down coming off the trailer and I instantly know whats wrong.


Thanks. Iíll try these if the wedges donít do it.
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Old 30 August 2019, 03:46   #19
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Try a 4 blade prop thatís helped me. Now it just hops up onto the plane
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Old 31 August 2019, 02:49   #20
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Quote:
Originally Posted by hesko View Post
Try a 4 blade prop thatís helped me. Now it just hops up onto the plane
Same pitch?
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