GregOddity
Well-known member
Re: SV Oddity, Interiors & Materials
I 'm expecting that the thickness of the hull is the saving grace on that. But like I said before it's my first GRP boat so still a lot to learn. The Tesla or Hybrid cars have beautiful salvage parts that I would very much like to get my hands on. Problem is finding one. It's virtually impossible, like gold dust. Same with most electric cars. Way too many goodies.
I was on a boat that had an Aquadrive and was reengined, then no Aquadrive. The noise and vibrations were quite noticeable and the owner was cursing most of the time that he decided to go along with not replacing the unit. His was not in the best condition from what I gathered and the new engine was of different dimensions. I was surprised at the difference in noise alone let alone with some resonance. He was told the new engine was yada yada “efficient and modern and no need for that”. That’s how he explained it to me.
I, of course, did not know any of this when I stepped on board the second time and unwittingly salted his wound, by asking if there was something wrong with the new engine, as soon as I put it in reverse and the boat vibrated and groaned.
I'm kind of partial on not having alignment at or near critical and reducing noise. There's always 1 mm that disappears somewhere and you always end up spending a nice amount of time getting the alignment right. Good on you. Thinking of going the same way exactly for that.
Oh good, back to sensible stuff.
GRP hulls in general are no less likely to suffer alignment variation than wood. Being thicker than average, yours isn't going to be as bad as some, although that will depend on how well you incorporate the cockpit floor into the box girder traditionally used.
That coupling is a very refined example of conventional marine thinking. Personally I'd be looking at taking one of the half shafts Tesla developed for the Model 3, and possibly replacing the steel rod with carbon. That would give greater articulation with less rotating mass.
I 'm expecting that the thickness of the hull is the saving grace on that. But like I said before it's my first GRP boat so still a lot to learn. The Tesla or Hybrid cars have beautiful salvage parts that I would very much like to get my hands on. Problem is finding one. It's virtually impossible, like gold dust. Same with most electric cars. Way too many goodies.
I fitted a similar Aquadrive to a previous boat, in conjunction with a 2 cylinder Yanmar. The reduction in noise and vibration transmitted to the hull was very considerable. With a later boat fitted with a 3 cylinder engine, I didn't see the need. So, from the vibration POV, it all depends.
It's still best to do a good job on the initial alighment however, but perhaps not quite so critical.
I was on a boat that had an Aquadrive and was reengined, then no Aquadrive. The noise and vibrations were quite noticeable and the owner was cursing most of the time that he decided to go along with not replacing the unit. His was not in the best condition from what I gathered and the new engine was of different dimensions. I was surprised at the difference in noise alone let alone with some resonance. He was told the new engine was yada yada “efficient and modern and no need for that”. That’s how he explained it to me.
I, of course, did not know any of this when I stepped on board the second time and unwittingly salted his wound, by asking if there was something wrong with the new engine, as soon as I put it in reverse and the boat vibrated and groaned.
That's the one, Halyard Aquadrive, I was struggling to remember the name of it and couldn't be arsed to look it up but I fitted one when I re-engined my old Vancouver 34 with a Yanmar 3 cylinder it was fine reduced vibration and associated noise to a level that was imperceptible and made alignment less critical.:encouragement:
I'm kind of partial on not having alignment at or near critical and reducing noise. There's always 1 mm that disappears somewhere and you always end up spending a nice amount of time getting the alignment right. Good on you. Thinking of going the same way exactly for that.