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Old 07 March 2009, 10:16   #31
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Country: UK - Scotland
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At the sort of age you are talking about it is likely the Humber in question was an Attaque or possibly a Destroyer as they were available at that time as well.
It is difficult to stop saying X brand is the best one to use because in the same circumstances this is the one chosen by the person giving the recommendation.
Most of my experience is in Humbers although I have driven three other makes extensively for diving purposes and had a good look at several others.
For diving you want wide beam and deep V, as much as possible to smooth out the ride heavily laden. Other things to watch out for are highish tubes to be at the right height for sitting on kitting up, high transom as it is not possible when kitting in rough water to always run the boat and empty via the trunk and as large a flat deck as possible within the tubes. You also want a bit more power on a dive boat than normal to make sure fully loaded it can plane easily although I have used a 5m humber diving successfully with only 60hp, it only did 21knots loaded though!
Ignoring other makes and concentrating on Humbers (bearing in mind above) you want to completely avoid an Assault (been there not very good diving platform) look seriously at a Destroyer, even more seriously at a wide beam Ocean Pro (not sure if the are available wide beam at 5m? avoid the 2m version as it is too narrow for diving).
Tornado, the original ones, secondhand are also very good and seem to last.
Ultimately there is no right answer as it may in the end come down to what is available and what you can afford but using the above things to look for plus any additional requirements of your own should mean you don't get something completely unsuitable whatever the make and model.
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Old 07 March 2009, 16:16   #32
Zan
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Country: UK - Scotland
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Make: Avon SR 5.4
Length: 5m +
Engine: 90HP Yamaha Outboard
Join Date: Mar 2009
Posts: 51
Thanks guys for all the input. Looking about the 2nd hand pages there seem to be generally more destroyers about within our price frame than the other models. I knew about the assaults being no good for our purposes, so I will definately avoid those.

I think I'd be quite happy with a Destroyer (on paper at least) and don't think I want anything bigger than a 5m boat. It's really just something to take a couple of dive pairs out, and to do the odd fun trip to say Ailsa Craig or up to the Firth of Lorne (once I'm happy with crazy tides!), and the Destroyer plus a decent (75-90HP) outboard sounds like it could cope quite well with all that.
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Old 07 March 2009, 19:13   #33
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Quote:
Originally Posted by Zan View Post
Good to know our car will probably cope ok, and I guess we can always hire a van if we need something bigger for a day with a slippery slipway or something!
I have had a 5m boat pull a full size 4x4 down some slips, some are really bad and even 4 wheel drive can't cope. Sliding down steep weedy slips with all wheels locked takes years off your life!
For a real exciting launch experience try Talmine at Kyle of Tongue, the picture on boatlaunch really doesn't do it justice!
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Old 08 March 2009, 06:49   #34
Zan
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Country: UK - Scotland
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Yeah, we've had trouble in places launching a small SIB with a transit van, so I know how bad they can be in places
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Old 18 March 2009, 09:34   #35
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Country: UK - Scotland
Town: West Scotland
Boat name: Orca
Make: Humber Ocean Pro 5.5
Length: 5m +
Engine: Tohatsu 115 TLDI
Join Date: Oct 2007
Posts: 168
Hi Zan,
I'm in a similar predicament at the moment. I've looked and looked and looked at all the various options out there. Finally (almost) decided on a 5.5m Humber Destroyer with 115hp Mariner Optimax DI 2 stroke. Humbers are a good price compared to the rest and have a good reputation. The Destroyer is a good sea boat. Probably go for a Dual Cruise console as well for when me and the missus go cruising instead of diving. Just need to sell the Humber SIB first. Then I'll give Humber a bell and pop down and look at options.

The SIB is fine for the sea lochs and some longer distance stuff when it's calm. It has plenty of deck space for kitting up and goes like a dream and sips fuel when it's calm. Ideal for nipping round to do the Breda and have taken it over the Firth of Lorne to the Sound Of Mull for a few dives on the Thesis. The trip over was 'fun' as there was quite a chop. Rounding Lady's Isle was 'interesting'. The main advantage of the SIB is easier towing/launching, cheaper running costs. A RIB is far more fun though.

Best of luck in the search.
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Old 19 March 2009, 09:25   #36
Zan
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Country: UK - Scotland
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Cheers, we have an SIB in our dive club and it's been a good wee boat for sheltered stuff, but I have no confidence in it as a sea-going boat! I'm definately going to have a look at the 5m Destroyers and see what I think of them. There's plenty of time at least - probably look into it for next year I think.
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Old 21 March 2009, 11:56   #37
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Country: USA
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Boat name: Sugar Mama
Make: Avon
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Engine: Yamaha 115 4-stroke
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I skimmed most of this, and noticed it was focused on hull type, here are a few more considerations in terms of setting up a RIB for diving (by point of reference, I have a Avon Adventure D5.6 with a Yamaha F115).

Motor: go with the most horsepower you can, you'll be hauling a lot of weight. I routinely haul 4 divers or three tech divers with ~100 kg of gear each, and the 115 is a great motor to get up and on plane (I'll do 30 knots and 6 gph with that load).

Deck layout: Here is where things get tricky. Most RIBs are designed, it seems, for seating comfort. Jockey seats are nice, but take up tons of deck space. You are going to want as much deck space as possible, tanks, gear, all that adds up. You are also going to want space for people to gear up--my boat has a rack in the back and a rack in the front, with areas to gear up in both (I've put padding on the front of my console so tanks can rest on the front seat). People will use your tubes for resting tanks on when gearing up, I'd recommend rub strips on the tops of the tubes that will give the tanks a flat area to sit on.

Tank storage: Have some racks built into the boat if you buy it new. Have a fabricator make some racks if used. Design the racks for the gear you use or may use in the future. I have a stainless rack made out of dairy tubes in the back of my boat, and a 5000 series aluminum rack up front. I can put rigged BCs in either rack, strap them down, and then inflate the BCs to lock things in place. Some pics of the front rack are attached.

Tube size: larger tubes are more difficult to get back over. We shuck our gear in the water, clip it off to gear lines, and get back in the boat. My buddy's 16 foot Polaris sits lower in the water as compared to my 18 foot Avon. Makes it easier to get back in. Just something to pay attention to when getting a boat, new or used.

Some pics, my Avon has the standard bench seat/console combo that sits four, I don't have a good pic of the stainless rack in back, but do of the front rack. It is ~18 inches high, and 20 inches by 20 inches, enough space to fit four tanks. This general concept works well, and you can tailor the rack size to fit lots of space in a boat. It is mounted in mine using HDPE blocks and lag bolts.
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Old 23 March 2009, 17:00   #38
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Country: UK - England
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Make: Avon SR4,AX500
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Engine: Yam 50 2 Stroke
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Delta Rib

Might be of interest?

http://cgi.ebay.co.uk/Delta-5-5m-rib...3A1|240%3A1308
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Old 24 March 2009, 05:57   #39
Zan
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Country: UK - Scotland
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oooh, that looks a nice boat!
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Old 24 March 2009, 06:57   #40
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Country: UK - Scotland
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Had experience of Humber Destroyers and 5.5m Northcraft for diving from, we used to get 5 divers in the Northcraft at a push and it would still go with a 60hp on it. We sold that for 3,500 i think, can now get 8 divers and still do 35 knots! The Humbers are pretty good as well, don't think you'll go wrong there.
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