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Old 09 February 2002, 13:00   #1
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Country: USA
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Make: Ribcraft 4.8
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Any Ribcraft 4.8 rigging tips ? ? ?

I thought I'd go to the mother country, and the Source, for any rigging tips for our soon to arrive Ribcraft 4.8 with Yamaha F60. I've read through the RB4 threads and many other posts on this excellent forum.

I'm interested in recommendations on compasses, electronics, transducer mounting, fuel storage (I couldn't afford the below-deck fuel tank), prop sizing, clothing, ANYTHING AT ALL, you've acquired from hard experience in the real (wet) world. The RB4 was a great event and makes good reading.

Does anybody use a Dole Fin?

thanks in advance.

Nick
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Old 12 February 2002, 09:30   #2
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I have just purchased a doel fin. it certainly helped the boat get up on the plane quicker and helped to plane at a lower speed so I am sure it helped to save fuel too...
As for all electronics positioning depends on how they are constructed ie entirely waterproof, or splash proof and what style console you have...
I built a console from scratch as part of an A-level design project and was able to design it to incorporate the equipment to be housed on it...
As for fuel tank storage... if there is no space under the console then a strap to hold the tank down with a quick release buckle seems to be the norm on most RIBs...
Alex
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Old 12 February 2002, 10:41   #3
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Thanks Badbaws. I'm inclined to try the Doelfin on my new motor. I'm going to wait and see how the F60/4.8 combination comes out of the hole before I decide.
I've used a Doelfin on a 30 HP 2 stroke Yamaha with a 3.5 m AB boat and the fin cured porpoising entirely.

Nick
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Old 12 February 2002, 11:00   #4
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You shouldn't really need a Doelfin on a decent RIB. If it's properly set up the hull should do the work.

They can be useful in some situations, but I wouldn't fit one as standard. Definitely see how you go first, and make sure that you have looked at things like weight distribution, engine height, prop size and pitch before you go bolting stuff on.

John
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Old 12 February 2002, 14:39   #5
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Nick

I also dont think you will need a fin.

My 50 pulls the 4.8 onto a plane in no time so the 60 should have no problems.

As far as fuel goes try strapping the fuel tank in FRONT of the console and run the fuel pipe down the engine cable trunking (with some extra protection).
I have a under floor tank and find that the 4.8 likes the weight kept forward for best peformance and ride.
I carry my spare 5 gallon there using two ratchet straps all the way round the drivers seat/console
Also I dont know how much you intend to carry but a flexi tank could also be an option.

As the prop goes I intend to drop a inch pitch but would recomend trying before any swap and dont do anything till the engine is FULLY run in say after 40-50 hours and not just the 20 hour in the manual.

What else have I done, Garmin GPSMAP 176 works well as the console is very small. And a good compass in a must I got RIbcraft to fit mine but think its about 85 mm class.

The last think is a decent bilge pump. The drain on the back of the Ribcraft 4.8 is far too small, being maybe 1.25" dia.
Also the drain does not work till your on the plane and the 4.8 wont plane half full of water I know !!. The best option would be twin elephant trunks but I have fitted a 1500 GPH pump. This will empty the boat quite quick when you get swamped (a good bucket also helps).
I did not drill the transom but made a rigid pipe up and hooked it over the transon next to the motor mounts whene it is clipped to. The pump is free in the transom well but does not move around due to rigid piping.

I have som other mods for this year but dont think they are specific to the 4.8 as a boat.

Have fun

Gary
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Old 12 February 2002, 14:45   #6
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Gary,
tell me about a flexitank. The flexible bladder style tanks I've seen are for diesel or non flamables. Are there ones for gasoline?
Nick
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Old 12 February 2002, 14:51   #7
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Nick

Yes you can get them for petrol. The RNLI use them on their D class life boats (Inshore).

The fasten to the tubes on one or both sides. I dont know how much they hold but would guess at about 5-10 gallons. The only down side is they are a sod to fill.

I also think thay some of the RB4 crews used them so may have more info.

Regards Gary
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Old 13 February 2002, 14:50   #8
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Flexitank info???

Does any one have a source they can give me for flexitanks for petrol for use in a rib?

Nick
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Old 14 February 2002, 12:11   #9
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Nick Although Flexi tanks serve a purpose, they are also a pain. They are expensive, difficult to fill and very unreliable when it comes to how long they last. My advise is to use the boat and get used to it.When you are happy, experiment with 20 gallon barrels of water for balance. You are in the best place to buy extra tanks. Boats US or similar are by far better sources than flexi tanks.

Alan P
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Old 19 February 2002, 21:53   #10
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(confessed equipment hound)

Thanks Alan, good advice. Sometimes chasing down equipment leads becomes the sport in itself (its a winter hazzard).

Nick
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