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Old 14 April 2015, 17:45   #21
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I'm not sure what you are expecting to see, the vast majority of ribs are bespoke. not like cars where many look the same.

Its an older cobra,there are many on the web, many owners on the forum. They are more on the leisure side of the market now (look at the website). You are quite correct none will look like yours, that doesn't make it special, just built to a spec set out at the time.

Twins/righting frame are a giveaway that its was a commercial spec boat, many commercial operators want redundancy of twins, (search this forum for pros and cons of twins).

As mentioned if you want 100% accurate definitive answers of the initial build go to the horses mouth (RNLI/Cobra).

As to repowering there are guys who have done this on the forums, take look at the built threads, some converting from twin to single, inboard to outboard or viceversa.
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Old 14 April 2015, 17:51   #22
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Had no intension to offend anyone by having my doubts , but the often answers like :I don't think so or in my opinion - are wrong.
Because someone may come along and prove them wrong. But I'm 99% certain they wont. Its a common ebay listing thing to see "Ex-RNLI" on some scuzzy RIB that happens to vaguely look like it was once a RNLI RHIB to the uninitiated.

The RNLI pedigree is good.
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If someone would answer : no, not RNLI because this and that etc... Then I wouldn't question that any more
Fine - No :-P

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I not hoping that's ex rnli. Way should I ?it is what it is and if it floats that's good enough for me. Definitive answer would help me search for the answers of the other questions that I might have .
So move on to the other questions ;-)
If it doesn't matter if its RNLI and you are being told its almost certainly not then move along and start with questions we can answer...

To be clear the RNLI boats were not Cobras. So we are probably all in agreement it was not an RNLI rescue boat. Occassionally a weird situation comes up where the RNLI take over an independant station and so technically may have used their rescue boat for a short time and most of the independents will be a typical commercial RIB. But the pedigree is then not really an RNLI RIB.

The other rare situation would be when the RNLI have a support craft, not used for rescue work but used as a work boat, crew transfer boat for a moored lifeboat. Some of those may be commercial craft rather than from the rescue designs. But it still wouldn't quite be the full RNLI pedigree although may well be better maintained than your average dive club RIB!

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About the hull... Never saw before that leisure craft would have that kind of A frame with capsize recovery device and radar reflector...also the gel coat color,twin underfloor petrol tanks...
Anyone with more knowledge about RNLI boats?
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Cause believe it or not I'm never saw another picture of the boat on the web that looks like mine.
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30 sec on google
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30 sec on google show that what I have seen for months.
No of them look one to one like mine.
I may be wrong, but I think Starovich was directing you to a number of examples of non-RNLI craft with re-righting frames.

What makes you think this boat was an RNLI craft
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Old 14 April 2015, 17:53   #23
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Ok then, how about laser cut, inch thick ,steel plate to mount engine lower then transom top and use existing holes of the two outboards to secure it?
I'm gonna look for twin setup for sale but up to then this mariner has to be ok.
It'd be easier to sell the lot and buy something that works together.

That old 135 is a lemon. If you drop it below the level of the transom, you'll have to step it back enough to get the steering to fit. You're unlikely to be able to rig it properly if it's dropped 7 inches -the rigging tube will be right against the transom and will bend the control cables very sharply if you tilt it. Essentially, it won't be ok.

. The hull, while nice is probably a bit higher spec than you need and looks like it probably needs a full re-rig.


I refitted a 7.8m rib a couple of years ago, and it cost an insane amount of money. I had everything there, fitted and at least semi-working to start with before I dismantled it. You don't have that luxury.
As it's your 1st boating experience you'll find that boat is a money pit the likes of which you've probably never seen. It'll be a cracking boat when it's done properly, but bodging on an underpowered ancient gas guzzler is just going to make the whole thing an even bigger lemon.

Given that it appears to have a bottle rack fitted as well as a self-righting A-frame, I reckon it's a pretty good bet it was a commercial dive boat originally.
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Old 14 April 2015, 21:40   #24
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Gents,
making no waves here...the discussion is the mother of truth....
i didn't bought it as ex rnli rib so no real reason of wanting it to be one,but i was speaking with with indespension trailer sales guy when i was getting new axle beams etc. and he asked the trailer chassis nr. so after i was asked im i rnli representative cause the trailer was delivered to them originally.
i know trailer is not the boat ,but including boat similarity's ex rnli rib fits the picture.only thing which confused me was the cobra sign on the tube which wont be on any life rescue craft.
IMO the boat was re-rigged several time before me and single console and rack which looks like dive bottle rack was fitted at last. just putted them in the boat after i dismantled it ,to plan new layout.
when i got the boat it was semi working too.i got all the gauges,wiring ,fuse block ,compass,battery switches ,hydraulic steering,chart plotter etc.
no engines only...
so when im saying i need it for this season i mean just hook up the engine correctly and give it a go...then see what is good or bad.
i agree that is easier to sell the one and buy two new,but easier is not cheaper and at the moment i don't want to spend more then i have too.
any info on improvement of the engine reliability (like the oil mix mentioned before )would be greatly appreciated .
i will stick few more pictures of the rig,plan and some of progress when will have any.
regards and thanks.
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Old 15 April 2015, 01:57   #25
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Few questions.Rib project

I have a 7m zodiac which looks to be a bit heavier than your hull and I can't imagine a 135 doing much of anything for it. I run a single 250 happily.

What are the merits a good cobra hull, color aside? If yours is a good hull then look for a proper engine. Either the right size single or twins. There seem to be more used motor options over there and it sounds like you cant do much worse than that old mariner. Shortcuts in boating can make the experience unpleasant and possibly dangerous.

I refit my boat to save money. It would have been cheaper to buy the one I didn't think I could afford. But I have a great boat refit with my own hands that is like no other

Jason
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Old 15 April 2015, 02:34   #26
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It'd be easier to sell the lot and buy something that works together.
Sound advice.
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Old 15 April 2015, 03:01   #27
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I reiterate what I said below. Your main cable inlet on that motor is going to be below the top of the transom if you sit that motor on there. It's going to damage the control cables if you tilt the motor.
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That old 135 is a lemon. If you drop it below the level of the transom, you'll have to step it back enough to get the steering to fit. You're unlikely to be able to rig it properly if it's dropped 7 inches -the rigging tube will be right against the transom and will bend the control cables very sharply if you tilt it. Essentially, it won't be ok.
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easier is not cheaper
In your case it is-your suggested cheaper option isn't a feasable option.

To give you a comparison, if you bought a 38 tonne Scania tractor unit with no engine, you wouldn't even bother trying to put a 1980s V8 Range Rover lump in it. This is essentially what you're suggesting.


Ref RNLI, the RNLI generally only use Atlantics-which are of a similar size. That's probably why your trailer comes up as ex RNLI.
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Old 15 April 2015, 06:29   #28
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I'll await the onslaught for this sacrilege......but if your absolutely bl**dy determined to stick with the boat then:

1 If you lop 7" of the transom you have a boat that you'll struggle to give away when the time comes.
2 It has no well so you'll constantly be getting water over the transom.
3 It's not likely to plane loaded up with 6 divers plus gear.

So that engine has to go.

From the proceeds you might pick up a couple of 40hp LSs.

It will definitely not plane but it should get you there and back at around 10knts at about 2mpg.

Problems 1 & 2 resolved and the lot could be re-sold as three separate components.

This is far from an ideal solution but is probably as close to a "no-cost" option as you're going to get..
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Old 16 April 2015, 10:35   #29
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I call cobra ribs today...they never did any ribs for rnli.that question is answered.
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Old 16 April 2015, 11:18   #30
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Why not just make up a fairly basic stand off bracket that picks up on the existing holes to avoid having to butcher the transom & give it a try
You've little to lose apart from a bit of time
It may be a disaster & you find the engine is underwater before the boats off the trailer or you could surprise everyone & find its slow but livable with
Not the 100%answer but might get you on the water sooner & not butchering the boat into the bargain
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