RIB Pitching to left... tim tabs ?

[Mollers]

Originally Posted by Bigmuz7

Its a lot of power for that length of hull .. throw some ballast in the bow, like 25 litre drums of water .. or the odd teenager if you can find em .. that should cure it .. not ideal but it works

DHD has the same set-up without the problem.

[Bigmuz7]

most likely due to console arrangement .. offset is an issue, but when your flying .. ballast distribution is everything I find

[Downhilldai]

Originally Posted by Cookee

Another factor is the amount of negative trim - the more you trim in, the more it will land on the left.

Yep, that was my thinking, but he said it behaved the same at all levels of trim.

Originally Posted by Bigmuz7

Its a lot of power for that length of hull ..

I disagree. They're not the lightest of 5.8m boats.

Originally Posted by Bigmuz7

... throw some ballast in the bow, like 25 litre drums of water .. or the odd teenager if you can find em .. that should cure it .. not ideal but it works

Not needed in a VM5.8/150 opti.

[Bigmuz7]

Originally Posted by Downhilldai

Not needed in a VM5.8/150 opti.

you must feed your crew well

[Downhilldai]

Originally Posted by Bigmuz7

you must feed your crew well

Skipper is top of the pecking order.

[Bigmuz7]

Originally Posted by Downhilldai

Skipper is top of the pecking order.

Hehe well lifting the motor worked on my 5.8 a couple of holes , but it scared the bejesus out of me before that, but then it just cavitated too easily after the lift.. and I couldnt corner as hard .. I vote for ballast + pies + teenagers everytime

[Clyde]

Fit trim tabs, had same problem with my 8meter ferryman, when fitted changed my boat completly,
also means you can run level in differnt conditions and payloads

[1978SeaRider]

Thanks for all the replies... Info is a week late due to the weather, but here we go.

The engine is offset 1inch.

The Cavitation Plate is 1 & 1/4inch Above the hull line.

The prop is a Mercury Lazer II and is a 19P... and has 48-16544 on it.

There engine is fitted with 1 inch to spare on the top of the transome.

Downhilldai... is this the same as yours ??

To claryify... It dives left, regardless of trim...

I'm now thinking, move the engine accross by 1/2 or maybe 1 inch and down by 1/2 inch maybe 1 inch.

You thoughts please !

[1978SeaRider]

Just spoke to Roy at Osprey (very very helpful) He suspects the engine may of been hung too low.... I've got a few more measurements to take this weekend. Basically I may have to lift the engine 3/4 to 1 inch up.... watch this space.

[Chris]

Is the offset in the correct direction? ie when looking from behind is the engine 1" over to the right of the boat?

Does the hull have a drain plug fitted? is there any water in the hull that could be unbalancing the rib.

[1978SeaRider]

Originally Posted by Chris

Is the offset in the correct direction? ie when looking from behind is the engine 1" over to the right of the boat?

Yep

Does the hull have a drain plug fitted? is there any water in the hull that could be unbalancing the rib.

Nope... Roy seems adimant that the engine height is the issue.... not the first time by the sounds of it...

[bedajim]

Originally Posted by Chris

Is the offset in the correct direction? ie when looking from behind is the engine 1" over to the right of the boat?

Does the hull have a drain plug fitted? is there any water in the hull that could be unbalancing the rib.

Would that be port or starboard ?

[Downhilldai]

Originally Posted by Downhilldai

I have exactly the same boat & motor, which I set-up with 30mm offset and the cav plate 40mm above the planing pad.

Originally Posted by 1978SeaRider

The engine is offset 1inch.

The Cavitation Plate is 1 & 1/4inch Above the hull line.

The prop is a Mercury Lazer II and is a 19P... and has 48-16544 on it.

There engine is fitted with 1 inch to spare on the top of the transome.

Downhilldai... is this the same as yours ??

Err, no, but not too far off.
I've also run the motor 20mm lower and had none of the problems you're experiencing.
Keep an eye on the water pressure if you experiment with raising the motor further. I reckon you may get some prop slip in tight turns if you do.

[Chris]

Originally Posted by bedajim

Would that be port or starboard ?

Oh yeah, Starboard.

Christ! I hope I spelt that right or as well as the nautical police I will have the spelling police after me as well

[1978SeaRider]

I reckon you may get some prop slip in tight turns if you do.
[/QUOTE]

I worried about that too.. but Roy seems adimant... and if anyone knows about Ospreys hey should !

As it doesnt involve cutting the transome, i'm going to give it a go I think... I can't live with the problem so somethings got to give !

[Mollers]

Originally Posted by 1978SeaRider

I reckon you may get some prop slip in tight turns if you do.

I worried about that too.. but Roy seems adimant... and if anyone knows about Ospreys hey should !

[/QUOTE]





With all due respect to the Bish, DHDai owns exactly the same rig as you, so he might have the edge.

[Chris]

Come on then what was the result?

[1978SeaRider]

its been such nice weather i've not done it yet !! The forecast is crap this weekend so it will be getting moved on Saturday... I'll let you know how I get on !