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Old 22 July 2011, 16:15   #11
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Quote:
Originally Posted by charlie65 View Post
not sure what it says ill check it tomorrow, as for trim tabs there is none , surely the outboard engine trims ??
Above the propellor is a zinc shaped like an upside down shark fin. On your size engine it should be about 10cm long. That is the trim tab on an outboard. Is it dramatically worn or missing altogether?

While a simple part, if it is misadjusted, worn/eroded, or missing it can cause all sorts of pulling problems.
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Old 22 July 2011, 16:38   #12
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Originally Posted by charlie65 View Post
maybe im wrong it was advertised as a humber predator , ok then maybe just treat it as a 5.5 metre humber ??
Post a pic. Someone will know what it is.
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Old 22 July 2011, 16:49   #13
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Quote:
That is the trim tab
thats not doing it. it is the up/down power trim ya need to play (carefully) with.
Trim the leg down (in as far as it will go towards the transom) when setting off and as soon as its on the plane trim up (moving leg out from transom) by stages until the steering lightens up and the boat rides flat without pulling to one side.

lets have the pic to see what model it is. Need to see bow and stern profiles. Various Humber models as earlier post. All have different characteristics.
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Old 22 July 2011, 17:53   #14
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Originally Posted by charlie65 View Post
advice needed

I have a Humber Predator 5.5m rib with a mercury 150 outboard , i have only purchased this , it was used as a dive boat, i have bought it to use for fun in and around belfast/bangor/northdown.Up to now i have not taken it much over 1/4 throttle as it feels out of control and dangerous, i have alot of inland water boating experience but no sea experience , ,i have been told the engine may be too powerful for the rib ? could this be true?, today there where 3 persons on board and it was anything but fun , the seas where not that choppy
the boat seems to pull to the right alot

any advice would be much appreciated
In a previous existence I had a 5.85 with a 175 on the back, a handful but not flighty or unstable. I'd rather see it with a 150 than a 115. What prop is on it?
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Old 23 July 2011, 08:50   #15
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humber rib

thank you all for your advice , i am on me way now to take pics so i will post them later tonight

thanks again everyone it is much appreciated
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Old 25 July 2011, 05:12   #16
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Just as a thought, if it was a dive rib, is it maybe set up to be perfectly balanced with umpteen heavy cylinders in a rack somewhere?

I've "only" got a 60 and there is a perceptible difference in handling between the forward tank being full & empty. Granted the whole caboodle only clocks in at about 430Kg when full of fuel......
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