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Old 01-02-2016, 08:48 PM   #1
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Is this bow wave OK?

Is this frothy looking bow wave just from the shape of the entry or is there something else wrong here?
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Old 01-02-2016, 08:57 PM   #2
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Looks like the shape of the entry to me.

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Old 01-02-2016, 09:29 PM   #3
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Seems to me that Mark's boat pushes a frothy mix at times.
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Old 01-02-2016, 11:16 PM   #4
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Mark would not classify this as a slicer.

Looks a bit bow heavy. And perhaps just plain overloaded.

Shes slab sided. So her max beam is probably all along the hull except wat fwd. so the angle of entry must be large to accomplish that way before amidships going aft. So she assumes a hull form not unlike a Great Lakes ore boat w the stern cut off. Not a slipey shape. The opposite of this scow like hull would be a sailboat. Slim pointy ends w a fat wide belly amidships. Same displacement and length but way different placement of displacement along her length. For the sailboat very little at the ends and a lot amidships. The boat above is a very poor shape for slow speeds. Good name for her would be "Ram".
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Old 01-02-2016, 11:50 PM   #5
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Its all in the windows! If they slanted forward the bow would appear lifting, as it is, with straight vertical windows, the allusion is the bow is blunt, would help if the anchor were more symmetrical in design. And like WW11, where ships were painted in camouflage, with broken lines and mixed angles, the hull shape was broken up. this boat could use a bit of that.(No, not 'breaking up')

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Old 01-02-2016, 11:58 PM   #6
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Old 01-03-2016, 01:02 AM   #7
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Sure wouldn't be okay punching into the steep, short period waves we get around here...probably way more spray over that pilothouse than ours I bet!
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Old 01-03-2016, 01:27 AM   #8
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She's a San Juan Islands boat. Beautiful inside and tough as nails on the outside. We've seen her at Fishermans Bay and out cruising. Nice boat! Tug Boat bow wave?
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Old 01-03-2016, 12:51 PM   #9
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Quote:
Originally Posted by Bob Cofer View Post
She's a San Juan Islands boat. Beautiful inside and tough as nails on the outside. We've seen her at Fishermans Bay and out cruising. Nice boat! Tug Boat bow wave?
Bob,
That is what it reminds me of as well, especially the top picture. Tug boat bow wave. The guy that converted this crabber sure seems like he did a lot of nice work but the boat being converted combined with this bow wave, makes you wonder if it is loaded as intended. It does seem to sit on its line in the water when resting? Interesting platform for a (now) recreational cruiser at the very least and quite a bit of boat for this money?
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Old 01-03-2016, 02:09 PM   #10
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Such a bow wave is typical of commercial tugboats.

It's a matter of bow shape. No harm if operating at not-exceeding-hull speeds.

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Old 01-03-2016, 02:22 PM   #11
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Mark, is that at 6.5 knots you speak too often?
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Old 01-03-2016, 02:31 PM   #12
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Mark, is that at 6.5 knots you speak too often?
6.3! ... a knot under hull-speed.
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Old 01-03-2016, 03:21 PM   #13
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Sure its OK just not the best economical speed for those boats. commercial tugs don't care too much about fuel use, just time. Some people here want the least possible fuel use, some don't care as much.
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Old 01-03-2016, 03:48 PM   #14
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6.3! ... a knot under hull-speed.
Right! okay if you say so.
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Old 01-03-2016, 06:08 PM   #15
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Al wrote;
"Right .. If you say so"
What do you mean by that?
My HS is 7 knots w a wll of 27.5'. And Mark's boat is a few feet longer so it's obviously very close .. close enough for this conversation IMO.
"No harm if operating at less than hull speed" for a FD boat it would be stupid to run close to hull speed. Sounds like you don't like what he said. Perhaps you're thinking he's talking about SD hulls. Then it makes good sense to run not only around HS but considerably above it depending on the hull shape. Like your boat. Running close to or even a bit above HS is what it was designed for. When you run your Marben at 1 knot below HS you'd be better off w a FD hull.

Does that make any sense?
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Old 01-03-2016, 07:03 PM   #16
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Eric-laterGo Hawks!!
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Old 01-03-2016, 07:25 PM   #17
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I don't know what an ok bow wave is but think for the type of boat in question the wave in the picture is appropriate. If you want a different wave you will have to narrow the hull -sharpen the entry- and lighten ship. See attachment for a different bow wave after hull parameters are changed.
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Old 01-03-2016, 07:52 PM   #18
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Sounds good to me.
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Old 01-03-2016, 08:21 PM   #19
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Quote:
Originally Posted by eyschulman View Post
I don't know what an ok bow wave is but think for the type of boat in question the wave in the picture is appropriate. If you want a different wave you will have to narrow the hull -sharpen the entry- and lighten ship. See attachment for a different bow wave after hull parameters are changed.

I always thought your boat was familiar, no I know why.
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Old 01-03-2016, 08:40 PM   #20
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Eric-


[QUOTE=manyboats;401036]Al wrote;
"Right .. If you say so"
What do you mean by that? (Hi Eric, looking at Mark's bow wave in that particular photo matched against many years of looking at bow waves and thinking I had a vision of Mark's boat bow underway from other past photos, believed that the photo depicted a boat doing a bit more than any 6 knots +-. As Mark responded that it was what he said it is I can only say 'If You Say So'
Nothing more, nothing less.)


My HS is 7 knots w a wll of 27.5'. And Mark's boat is a few feet longer so it's obviously very close .. close enough for this conversation IMO.(Iwould disagree, the difference between your boat hull and Mark's are further apart than inclusive in a single conversation. MHO)
"No harm if operating at less than hull speed" for a FD boat it would be stupid to run close to hull speed. Sounds like you don't like what he said.(See above, no, What Mark said is fine) Perhaps you're thinking he's talking about SD hulls.(No Idea here) Then it makes good sense to run not only around HS but considerably above it depending on the hull shape. Like your boat. Running close to or even a bit above HS is what it was designed for. When you run your Marben at 1 knot below HS you'd be better off w a FD hull.(If you say so hard to argue with somebody who understands my hull better than myself)

Does that make any sense? (It could, maybe, then again maybe not, sometimes, yes, sometimes no sense at all)[/QUOTE]
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