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Old 04-23-2013, 09:51 AM   #41
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My boat had 700 hp, but didn't need all of it to reach plane. On plane, her attitude was just a few degrees above horizontal, and her forefoot hovered just over the water. The design actually came from Lyman, CC inherited it when they bought the company. She used a lot less than 700 to stay on plane. Minimum planing speed was around 10.7 kts. I can't really judge if Posiden has enough thrust or not. They both look to my eye like classic semi D hulls, happiest at S/L 2.0. Great in a chop, but very, very, wet.

Posiden's props do seem small. Maybe optimized for higher turning gas engines? What's her length?

Never mind, just went through the thread again. 53' and Heavy.
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Old 04-23-2013, 10:23 AM   #42
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What does the size of propellers have to do w the kind of fuel being used to turn them?

Posiden is a SD hull but much closer to a planing hull than a FD. So I would think she should have enough power to go well over disp speeds. But it dosn't look like it. I looked at her listing and there is no mention of speeds at all. Dosen't make sense unless someone is trying to cover up the fact that she can't get out of her own way.
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Old 04-23-2013, 12:50 PM   #43
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Diesels are usually low rpm low hp, hi torque, and gas engines are high rpm, hi hp, low torque. High revving engines require less gearing if the props are small and high turning too...

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What does the size of propellers have to do w the kind of fuel being used to turn them?

Posiden is a SD hull but much closer to a planing hull than a FD. So I would think she should have enough power to go well over disp speeds. But it dosn't look like it. I looked at her listing and there is no mention of speeds at all. Dosen't make sense unless someone is trying to cover up the fact that she can't get out of her own way.
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Old 04-23-2013, 01:19 PM   #44
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Thurman,
No need to be. Just choose. The appropriate gear ratio to turn the prop you want. You could turn a 30" prop w a Briggs&Stratton if you wanted. Might take a 50-1 ratio though.

Most boats had direct drive when boats mostly had small props like old Chris Craft's and engines that ran at 1400 to 2000 rpm.
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Old 04-23-2013, 01:49 PM   #45
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Thurman,
No need to be. Just choose. The appropriate gear ratio to turn the prop you want. You could turn a 30" prop w a Briggs&Stratton if you wanted. Might take a 50-1 ratio though.

Most boats had direct drive when boats mostly had small props like old Chris Craft's and engines that ran at 1400 to 2000 rpm.

I noticed that the broker is claiming this boat has direct drive as well. I think the Volvos listed are 2800 at max rpm.

I'm aware that the proper gear selection can accomodate variations in props, but I wonder if your 50-1 ratio might have unacceptable gear train losses. In any case, the boat was reengined, and I too have the feeling that an expert was not consulted in the powertrain choices...
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Old 07-30-2013, 03:47 PM   #46
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interesting hull

Hi All.

i saw this artical about this hull.
Thought I,d show you my boat, Shes a 1982 All weather Shipmaster, 8.50 metre, built by G.LWatson & Co of Glasgow, they built the Arun class lifeboat, pilot boats, and boats for the UK MOD, the hull is a Ragged Chine design, bit like a spray rail, keeps her very stable in rough weather, twin 120hp fords, will do 19 knots, no slaming, smooth ride.
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Old 07-30-2013, 06:12 PM   #47
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That is a boat I could REALLY REALLY like.

A lot of wetted surface though but well worth the dry and smooth ride.

Is it thought the "ragged chine" helps create the smooth ride? I doubt that it does. I'd suspect that the smooth ride has all to do w the deadrise. But the pic dosn't show a lot of deadrise ??????
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Old 07-30-2013, 08:14 PM   #48
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Hi All.

i saw this artical about this hull.
Thought I,d show you my boat, Shes a 1982 All weather Shipmaster, 8.50 metre, built by G.LWatson & Co of Glasgow, they built the Arun class lifeboat, pilot boats, and boats for the UK MOD, the hull is a Ragged Chine design, bit like a spray rail, keeps her very stable in rough weather, twin 120hp fords, will do 19 knots, no slaming, smooth ride.
Someone posted a pic of a similar bottom on a 40 something motor yacht not too long ago...had more than a few heads scratching to the design and it origin.
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Old 07-30-2013, 08:32 PM   #49
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Quote:
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Hi All.

i saw this artical about this hull.
Thought I,d show you my boat, Shes a 1982 All weather Shipmaster, 8.50 metre, built by G.LWatson & Co of Glasgow, they built the Arun class lifeboat, pilot boats, and boats for the UK MOD, the hull is a Ragged Chine design, bit like a spray rail, keeps her very stable in rough weather, twin 120hp fords, will do 19 knots, no slaming, smooth ride.
That looks like a very capable boat, with sweet lines, and she looks well kept. It would be a shame to see her damaged when she falls off that awful blocking of oil barrels and cinder blocks. That hull would be expensive to repair!

Just sayin'-if the boatyard won't provide proper jackstands and safety chains, find another place to haul her out!

(sorry, I'm a retired insurance surveyor who's seen the damage done by yards who operate on the cheap - I just can't help myself when I see such carelessness.)
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Old 07-30-2013, 11:52 PM   #50
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Gnorts,
The drums are three to each side and I've been blocked that way many times. I'd feel very secure w the blocking shown. There is a better way of setting up the drums and blocks of wood. It allows the drums to be vertical and the bottom to be flat on the ground resulting in support probably superior to "proper" jack stands. A bigger footprint for one. Difficult to attach a chain under the keel but creative blocking can over come most of that issue up to a point. These drum stands may be marginal for extreme deadrise hulls.

Also the blocking shown is used extensively in small private marinas.
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Old 07-31-2013, 01:45 AM   #51
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Don't know about the ride, but if you like the sound of the waves lapping against the hull at night, this is the boat for you!
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Old 07-31-2013, 06:39 AM   #52
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Interesting Hull form

Hi All.

I was told they only built five of this model, I know of one in Scotland, and one in France, Engines were fitted with V drive gear boxes, so no engine hatches, walk straight through to cabin.
Just to say the boat is not kept in that yard any more, and is secured with blocks and steel beaching legs,
we do a lot of boating around the french coast, Channel Islands, were there is a full and rise of tide up to 10 metres, tides run through islands around 3 to 7 knots, wind against tide can be quite bad, but in this boat no problems.
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Old 07-31-2013, 04:41 PM   #53
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Bertram 31

Didn't the Bertram 31 have a hull somewhat similar? ...the strakes just didn't start as far forward up above the waterline?...and there weren't quite as many
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Old 07-31-2013, 04:54 PM   #54
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The 'Bladerunner' also used these
YachtForums.Com - View Single Post - Trimarans and the BladeRunner...


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Old 07-31-2013, 04:58 PM   #55
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Oh the B-31 ... so beautiful.

The Shipmaster's "ragged chine" is more to control spray and the chines may provide a bit of lift keeping the water (to some extent) under the hull but the cost in wetted surface must be rather large. Perhaps too large as we don't see many like this.

The B-31s "lifting strakes" are shaped to produce lift and reduce wetted surface. The Bertram's strakes probably actually increase efficiency.
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Old 07-31-2013, 05:11 PM   #56
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Peter Paynes Sea Knife Designs

Have you ever seen these?
Trimarans and the BladeRunner... - Page 4 - YachtForums.Com

...not really a 'trawler subject', but a lot of interesting discussion and photos of unusual hull designs.
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Old 07-31-2013, 05:44 PM   #57
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interesting hull form

Hi All.

I know my boat is not a trawler type, just thought the hull was interesting to some, has soon has I saw my boat for sale I had to have it. where ever I go, I get a lot of people asking where it came from, i found this picture of a round Britain power boat race, 1969, a boat called foamflyer 26 foot. designed by G.L.Watson.
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Old 07-31-2013, 07:22 PM   #58
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Those chines don't appear to be of any benefit if one keeps to "hull-speed," as all "good" recreational "trawlers" do.
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