Marlow 65' seatrial vibration

Digging up a very old thread, sorry, but this was a fascinating read. What got me here is I am looking (online) at a Marlow 70' and am wondering if I should even bother to consider her at this point.

Here are a couple pictures. The props seem small and rather closely spaced, but don't seem to have the problematic tunnels mentioned in this thread. Not sure where the exhaust ports are (that lead to the cavitation / vibration mentioned above). The two ports on either side of the transom at waterline seem too small to be the main exhausts.

Thoughts?

I would say those are problematic tunnels. You have whatever those giant things (shaft tunnels) are that the shafts are encased in, making the water veer away from the props and the props trying to suck the water that is flowing around them versus just a shaft and normal small strut. The thing sticking down in the first photo, is the tail end of exhaust deflectors, which in my opinion are a bandaid for poor placement of the exhaust.......

Yes, now I see the tunnels very clearly. Thanks. Moving on...

Bryan

And ultimately the only way to find out if they were effective is through an intense and thorough sea trial and that likely requires an offer and money.

Wow, first time seeing this build out of the water. The prop placement reads of a cyclops. Even with the tunnels, how can those props not impact each other with wash?

One of the scariest yachts I ever ran, one of the top two, was a new 2014 56' Marlow. 2-4' seas off of the starboard stern quarter, at 16 knots, boat rolled so hard and fast one time that a Personal cooler flew across the entire flybridge and hit the side of the flybridge on the opposite side without ever touching the ground, it almost ejected all of us.

With all of that junk in the water, it appears that David Marlow took ideas from every yacht ever built and just threw them altogether on one yacht. LOL

David Marlow is a mad scientist. He can't stop. He is always looking for a little more or better, so no two boats come out the same. That means some are delivered with permanent issues that can't be corrected. He's knowledgeable and has a lot of ideas, but the execution is missing as he just decides he could do this or that and be a little faster.

Perhaps he was looking at pictures of Fountain raceboats and decided to stagger the motors for better weight distribution. LOLOLOLOL

Odd thing is the Marlow's are slow boats, he's always looking for a little more speed???? Can't figure that one out.

I've always enjoyed looking over Marlows at the dock. This Marlow on the lift, however, that's a cacophony of nonsense underwater. Those props so close together, neither with even the slightest opportunity to grab clean water...

Engine room of this particular boat. Cat 3406Es. Doesn't seem to be too bad, but I'm still not clear why the props are so close for a boat with an 18'4" beam.