Humber destroyer 7.0

[C-NUMB]

Considering buying a used(can be considered a project boat) Humber destroyer 7.0,
narrow beam RIB from 1995. have not seen the boat Yet, but owner claims that the deck is
GRP, no plywood? Can it be, taught most of the rib has a plywood/GRP composite deck?

Any taught about the hull, how does it handle the sea, any disadvantages due to rather narrow hull(except for lack of internal space)?

Thanks

[HUMBER P4VWL]

Narrow hull will clearly give less deck space but in terms of seakeeping be better in the waves at speed due to less width hitting them. Like a knife vs a brick.

It will roll at rest slightly more but I doubt you'd notice much as the tubes on a destroyer likely rest on the water at the rear.

Didn't know there were GRP decks... Could have been possibly.

[Pikey Dave]

Narrow hull = more chance of stuffing in a following sea, a la attaque


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[breezeblock]

Originally Posted by Pikey Dave

Narrow hull = more chance of stuffing in a following sea, a la attaque


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this may sound silly but what do you mean

[C-NUMB]

Good point regarding the stuffing. But think it will in any case give some comfort compared to my 5.4. A 7.0m is more than i need but reasonable priced little bigger ribs are rare over here. Will inspect it on Sunday, will let You know about deck material findings. Will take a small Makita drill along, then will know(if they let me)

It has an old Suzuki 150 2 stroke(-89-90), apparently in working order but guess that is not worth much.

[Pikey Dave]

Originally Posted by breezeblock

this may sound silly but what do you mean

Well, use HPs analogy, a narrow beam is "sharper" so in a following sea, I.e. The waves/swell behind you, as you slide down a wave into the trough, a narrow beam is more prone to burying it's nose into the base of the wave in front. This causes a rapid halt with water over the bow, in extreme cases the wave behind you (that you just slid down) now comes over the stern & swamps the boat. A wider beam has a "blunt" profile & is less likely to stuff, preferring to ride up the back of the wave. I've been in an Attaque sat up to the tube tops in water after a particularly impressive stuffing. Any boat will stuff given the circumstances & careless handling, but narrow beams are less forgiving.


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[breezeblock]

thanks for clearing that up

[Pikey Dave]

Originally Posted by breezeblock

thanks for clearing that up

You're welcome👍


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[Maximus]

Originally Posted by HUMBER P4VWL

Narrow hull will clearly give less deck space but in terms of seakeeping be better in the waves at speed due to less width hitting them. Like a knife vs a brick.

It will roll at rest slightly more but I doubt you'd notice much as the tubes on a destroyer likely rest on the water at the rear.

Didn't know there were GRP decks... Could have been possibly.

You reckon!?...Oh..maybe that's why the RNLI Hardboat Off shore rough weather rescue fleet like "Shannon" "Tamar" and "Severn" are so Narrow and pointy then!
Maybe they should Trade in thier Atlantic RIBs for Revengers and Cougars too?

[willk]

Originally Posted by HUMBER P4VWL

Narrow hull will clearly give less deck space but in terms of seakeeping be better in the waves at speed due to less width hitting them. Like a knife vs a brick.

Thanks for clearing that up!

I'll slow down a bit from now on, then...

[C-NUMB]

The beam issue, and its impact on sea keeping abilities is interesting. The destroyer range does not have wide beams but in the 6 m range ocean pro has both 2,34 and 2,60. Would be nice to know how they would perform in a situation total weight would be equal. Out of the blue would guess the narrower would be softer, but who knows? My searider is not the softest hull but still performs well compared to many bigger hard boats in chop, i guess this is at least partly due to its rather narrow hull?

[mick]

Give me a wide beam any day smooth as silk mine is compared to the narrower ones I've been in.

[Maximus]

Originally Posted by mick

Give me a wide beam any day smooth as silk mine is compared to the narrower ones I've been in.

....You can't beat practical experience Mick

[mick]

Originally Posted by maximus

....you can't beat practical experience mick

👍😂😂!!

[mick]

Going down a biggy

[Pikey Dave]

It isn't just about beam width per se. Otherwise a cathedral hull dory would win hands down & we all know that ain't happening. The hull shape/dead rise/"V" are all factors. A deep v flaring out to a wide beam as in Micks Redbay will offer a forgiving ride, the V cuts the water & softens the entry & the flare gives good deceleration & softens the landing. Into a following sea, a (relative) wide beam presents a blunt point of entry to the wave in front & lessens the tendency to dig in. It's like trying to stab a pickled onion in a jar with the fork handle instead of the sharp end😄


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[jwalker]

You're unlikely to stuff a Destroyer, even in a following sea, you'd have to be driving very badly to get the bow under water. Back off the throttle a tad going down the wave and apply plenty of power when you reach the trough.They have a high bow and a high lift hull at the bow. I owned a 6.5mtr for a number of years and never got the bow under water. It's also a good boat in a beam sea, particularly if you've got plenty of power - power along the trough and skip over the end of the wave as it subsides then repeat. Good fun and you can keep a good average speed - my favourite way of travelling when I had my Destroyer. If you fit a bow lifting prop, at 7mtrs it'll be a good head sea boat too. 150hp is a little under powered but still satisfactory. Obviously top speed will depend on the weight of equipment the boat has aboard but a lightly loaded 7mtr with 150hp should see about 40knots.

If the boat is in satisfactory condition and the price is right, you're unlikely to regret buying it - imho of course. The deck will be ply sealed below and overlaid with fibreglass. Look for cracks at or near the transom knees, pull the bung in the transom drain well, a good boat will be air tight, you may even hear a hiss or pop as the air moves in or out. If it's full of water, then maybe walk away.

[HUMBER P4VWL]

As unlikely as most other deep V Ribs of a similar size but certainly possible, it is in anything in the right/wrong sea!

Good fun though in a way provided you don't take your face out on the console and you can get underway again. LOL

As for a beam on sea, the destroyer with few chines and a high sheer bow will have a fairly wet ride compared to peers with lower now or more chines. It's a bit like the Delta Dash. The wave will rush up the hull and is thrown in a more upwards direction for the wind to blow it in your face. A lower bow (tubes) or chines will force more spray out at a lower angle. Drier ride.

That said, in a chop, head on, or in a following sea, the high sheer bow is great.

Like anything, a positive is a negative in a different circumstance.

More chines give lift and ultimately (negligible) more impact to a smooth hull. So a destroyer head vs an ocean pro (more chines) in a head on sea may give a slightly more comfortable ride. But you'd be sat ever so slightly lower in the water using a little more fuel.

And on it goes....

[breezeblock]

next question whats a bow lifting prop and whats different from a normal prop

[Pikey Dave]

Originally Posted by breezeblock

next question whats a bow lifting prop and whats different from a normal prop

Ahh! Now we're getting into the black arts😄 most folks think that a prop is a prop is a prop, nope! Props are like car tyres, good, bad, indifferent. By altering the geometry of prop blades, different properties can be bestowed on the prop. A prop can be bow lifting in that it hooks in & pulls the stern down, thus lifting the bow. Other props try & "climb" out of the water, thus lifting the stern (handy on twin engine installations with heavy sterns) this lifts the stern & brings the bow down. This can all be a function of number of blades/rake/cupping/blade shape & size. The Mercury site has a very good section on props & how they work.


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