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Old 21 May 2002, 15:43   #11
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Country: UK - England
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Hi Brian

Found a US link http://www.boatsunlimitedny.com/gaffrigdrive.htm

From the pics looks like its no more than an afternoons work to make one and the bits look cheap.

Gary (planning upgrades before I have the boat) Greenwood
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Old 21 May 2002, 21:17   #12
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'Shower heads'

Ref to all the above, my experience (although it be in a comercial situation) the bravo 3 leg and the Yanmar 300 is to be avoided for all financially aware people.
But the cooling of the leg is a definate- the problem was that the oil, synthetic or not at 80 a gallon was simply boiling, then cooking the supposedly uprated bearings - this cooling fended off this problem.

The 3X drive is allot better and have not heard anything to bad as yet-------but the risk of having a leg go at under 200 hours is not acceptable in commercial, or pleasure use.

My view (which is well open to comment) -------Noise factor------
The Yanmar 300 is still only available with a through transom exhaust- noisey to say the least, people will really hear you coming round the corner- the exhaust through the leg is grand, quite and you can actually speak to each other.
Also- correct me if i am wrong- do you have a pilots licence for a 7.8m with poss a 300 in it ??

Cheers

Pete
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Old 22 May 2002, 02:08   #13
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Pete - I'm switching my attention from the "Yamaha 240 Wanted" thread on the bits and pieces forum to this one. You seem to be on the case and have got me worried about the Yanmar 300 + Bravo 3 - even - 3x leg.

My reason for considering a switch away from the Yamaha 240 is that the overall length inside the engine box is 12.53cm longer than the Yamaha 165 and the Yamaha 240 is 17.20cm longer.

Now, I reckon I have only got a slack 15cm without cutting up the box and and a bulhead and so the fitting is going to be easier with the Yanmar. Even if I have to fill in some holes in the transome and make some new ones there.

And I gain 45hp. Magellan Alpha is a heavy beast and all the power will be useful.

Brian Elliott told me about the need for the shower head - his Bravo 3 leg failed on the RB4 - and he was upgraded to the 3X. Since then he reckons things are OK. However, I really don't want to go down a route that leads to equipment failure. I want to go for extended range cruising and reliability is vital.

Another, though smaller factor to take into account, is that there are no Yamaha dealers in Cornwall. Nearest is in the Solent. Yanmar have a reputedly good guy who would fit in my local boat yard 2 mins from home.

What would you suggest? I'd appreciate your views...
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Old 22 May 2002, 04:03   #14
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Noise, and other things......

Ref. Noise and Yanmar 300's. I've done a few miles on Cyanide and have never had any sense that the engine was particularly noisy. Through transom exhaust with a hyapalon elephant trunk type tube (probably a Scorpion patented thing) and no problems.
Quite a satisfying throaty rumble and of course the fantastic turbo whistle. All part of the powerboating experience IMHO!

On the drive issue, I believe that the new Scorpion monster cabin RIB with twin 300's uses Bravo 1 (single prop) drives. Presumably because these are more robust? Might be worth thinking about?

HTH,
Alan
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Old 22 May 2002, 06:38   #15
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Alan, Brian explained that the Bravo 1 leg does not have a contra rotating prop which is necessary for a single engine boat. To stop the twist when hitting the water after getting airborne, I believe. Reckon I need the contra rotating job witha single engine. Don't I?
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Old 22 May 2002, 06:46   #16
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Well yes & no!

Errm I can follow that argument BUT there are absolutely loads of boats with outdrives and single props. Not neccesarily RIBS but most speedboats/sports boats etc. Your current drive is single prop & you don't have any problems in that respect do you? Although you don't have enough power to get her airborne ! Alan P has a single prop on SOC as well, plus John K on Phoenix etc etc.

What you might need (if you don't already have 'em) are trim tabs which you can use to correct any list. (usually planing boats lean into the wind.)

I think you'd be well advised to have words with Yanmar on this one. Either that or give Jim Mackintosh a bell (I can email his number if you don't have it.) He's a pretty knowledgable chap about this type of stuff.

Alternative junk the 165 diesel, stick a couple of gill brackets on the stern and bolt on a couple of 225hp outboards!!

Cheers,
Alan
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Old 22 May 2002, 07:29   #17
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Gary

I have had a 8.5m RIB with a YAM 240hp/Yam leg and you are correct that the boat wants to twist one way when getting up on the plane. Using tabs to offset this would then mean once on the plane the boat would lean one way until you reset the tabs.

In my experience you tend to compensate, with the wheel/helm, while throttling up and it becomes second-nature. The hydra-drive on the Yamaha is absolutely brilliant compared with the Yanmar/Bravo 3 combination which seems clunky in comparison.

Also the turbo on the Yamaha is constant so there is no lag which means you have quick throttle reactions. I towed a 40ft Cat out of the Needles race a few years ago in a breaking confused 20-30ft seas and the ability to get the power on quick was a major safety issue. Im not sure how the Yanmar would have coped.

The Bravo III leg with the Yanmar 300hp is a superb combination. Take off and landing, assuming the boat is straight, is precise/easy with no twist on re-entry. The torque of the Yanmar once the turbo is in ( about 2250rpm with 26 inch props ) is breath taking.

So in summary both engines are very good in RIBS and each has advantages/disadvantages so which ever one you go for, you wont be disappointed.

Personally my preference is the Yanmar/Bravo III.

If you are down Bournemouth/Poole way then Id be pleased to take you out

Regards

Mark
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Old 22 May 2002, 14:52   #18
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Thanks everyone.

Looks like its going to be the Yamnar240 + Bravo 3.
Still need to confirm the setup to Ribcraft, but from your comments I am more than happy with the combination.

Now all I have to do its wait, wait & wait until I get to try things out for real.

On a slightly diferent note as the boat/engine will be brand new and be launched down south, and need to be brought up north how much running in does a new diesel need. If its lots I may consider having it brought up bay waggon.

Dont want to do 10Kts all the way up here

I hope to be able to get on some long trips with you all soon, well next year.

Thanks Gary
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Old 22 May 2002, 14:53   #19
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Bravo Legs

Mike

Ref your reply.

I actually do not know if the bravo 1 is beefed up enough to take the 300hp?? best ask themselves if that is possible.
As i keep spluttering on about the bravo 3 leg, I swithered and all that before i bought my volvo, and the only real choice is/was the volvo or the Yanmar 300/bravo 3 leg - I went for the volvo, and have had not problems aprt from an alternator going - 1300 hours later ( although i do have a spare leg in the shed just in case)
If i had gone for the Yanmar Bravo 3 combination, I would have not been afloat financially in my 1st year.
Taking into account this horror story is about commercial operation..
2 boats, 2 years operation 9, yes 9 legs between them
One leg did 14 hours, it got to the stage where 200 hours was the max untill the 3x leg was put on - and as yet no problems.?

Personally would'nt touch one.

Angel of Doom
Pete
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Old 22 May 2002, 20:41   #20
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Why Mix

Gary

Good to know you have made a choice.

Question...... you have virtually decided to go for the yanmar 240 and the mercruiser leg --- 2 different makes attached to the same thing... why not choose the same leg and engine - the 240 hp yamaha? size is the same, unsure about price, but why??

Suggestion of manufacturers maybe ? Prove me wrong......

Cheers

Pete
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