Discussion
The Isotta Fraschini W18 is a W configuration having 3 heads of 6 cylinders each, nominally 57 litres total. MTB 102 had three of them at one stage. There used to be one on display at the British Military Powerboat Trust Museum at Marchwood. Sadly now shut down and the exhibits scattered.
http://www.youtube.com/watch?v=6eK69X3H1Oc
http://www.youtube.com/watch?v=6eK69X3H1Oc
Lefty said:
Didn't the old US Navy PT boats use Packard built Merlin V12's?
or did i imagine that?
Packard engines & V12 but nowt to do with Merlins. Packards were marine engines awhile before the Merlin was on the scene.or did i imagine that?
http://www.pt-boat.com/packard/packard.html
Paddy_N_Murphy said:
You think ?
1,200hp.
Might just get on a plane
(talk about f
king ridiculous willy waving doing that ^^^)
Cant remeber where but i recently saw a pic of a similar bboat with 6 or even 8 350's mounted in the back! it was used by UK drug smugglers to bring things over the contient. THink the UK coast gaurd had to get in a special helicopter to chase it! lol 1,200hp.
Might just get on a plane
(talk about f
king ridiculous willy waving doing that ^^^)So yes there IS sometimes a need for it!
splashout1 said:
Have a look and see if you can find anything on Richard Carr's collection all started with lethal.
there was lethal magic which I believe had 3 supercharged chevy engines
lethal menice which was a race cat with a v12 lambo engine
There was also the truck and a cobra rep all painted up in the same colour scheme!
It actually had 3 supercharged ford big blocks in the back. Was bought by Colin Stoneman father of ex Formula 2 Champion Dean Stoneman. I used to work for them at their Formula Renault team and stripped the 3 engines of that boat down for re build enforce I left . Has since been sold on but he still owns the Cobra which is stunning!!there was lethal magic which I believe had 3 supercharged chevy engines
lethal menice which was a race cat with a v12 lambo engine
There was also the truck and a cobra rep all painted up in the same colour scheme!
Edited by andyrooo on Monday 30th January 19:44
Paddy_N_Murphy said:
Yachtworker said:
Counter rotating its a must as it reduces steering effort, stops the props walking the stern of the boat around.
I did think the prop walk would be a little rude with four of those the same screw.2 steps forward, one sideways
however
Inner props are left hand
Outer props are right hand
i would of expected the two port engines to have the same handing and the two starboard to have different handing
thinfourth2 said:
Paddy_N_Murphy said:
Yachtworker said:
Counter rotating its a must as it reduces steering effort, stops the props walking the stern of the boat around.
I did think the prop walk would be a little rude with four of those the same screw.2 steps forward, one sideways
however
Inner props are left hand
Outer props are right hand
i would of expected the two port engines to have the same handing and the two starboard to have different handing
I would have expected two inners counter rotating and the two outers counter but opposite the inner next to it.
So rh > lh > rh > lh
Then if you come down on one side or the other you won't get any walk.
MOTORVATOR said:
You been thinking about it for the last four months?
I would have expected two inners counter rotating and the two outers counter but opposite the inner next to it.
So rh > lh > rh > lh
Then if you come down on one side or the other you won't get any walk.
That is what i would expectI would have expected two inners counter rotating and the two outers counter but opposite the inner next to it.
So rh > lh > rh > lh
Then if you come down on one side or the other you won't get any walk.
Then you can use the two outer engines at slow speed without any walk
So is there a reason for
LH RH RH LH
thinfourth2 said:
MOTORVATOR said:
You been thinking about it for the last four months?
I would have expected two inners counter rotating and the two outers counter but opposite the inner next to it.
So rh > lh > rh > lh
Then if you come down on one side or the other you won't get any walk.
That is what i would expectI would have expected two inners counter rotating and the two outers counter but opposite the inner next to it.
So rh > lh > rh > lh
Then if you come down on one side or the other you won't get any walk.
Then you can use the two outer engines at slow speed without any walk
So is there a reason for
LH RH RH LH
I'm not totally familiar with those Verados but it may well be that the counter rotating box option is single gear only or no dog clutch so has to be started in gear.
That would then make sense for close quarters work as you would want at least one pair that you can forward reverse against each other.
Another possibility is that you can't use extensions with a counter rotating box although I find that hard to believe.
The final option is that the vendor had no f
king idea about rigging boats.
I think that keeping the closest pair in the same rotation reduces the possible cavitation and works better in astern, his port & Stb control is fine and one thing these guys care about more than top speed, is being able to park it easily without bumping the big boat or upsetting the Owners wife etc, if you try band park against a side boarding ladder when the boat is at anchor in the bay of Cannes or off Pampelonne, its a small target in a confused sea.
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