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Old 05-18-2018, 10:13 AM   #141
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Wondered about that myself but doesn't the USCG use a lot of inflatables like that? I guess you can replace the tubes but who knows at what cost.
Tube replacement is exactly what is done.
On the Rescue boat that my RCMSAR unit uses, the refit done last year included replacement of the tubes. I don't know the cost, but our fundraising branch had no trouble funding it. I know that the tube replacement schedule is longer and way less expensive than the outboard replacement schedule.
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Old 05-18-2018, 05:45 PM   #142
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On RIBs it is possible to replace the tubes. Some boats have tubes that are glued to the hull. Others have tubes that "slip" on. I bought a used Zodiac Pro. The hull was fine, but the tubes were old. I just new tubes from the manufacturer and slipped them on. Took about an hour to install and secure them. Then I basically had a new boat. For a 16 Zodiac Pro, the new tubes were about $2K (at the time).
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Old 05-18-2018, 06:24 PM   #143
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Our Novurania tender has tubes that are getting a bit tired and I expect to have to replace them in a season or two. Keeping them under a canvas cover when not in use helps extend their life as does having a covered slip. But, like outboards, the tubes are a consumable item.

I would love to see a 300hp high thrust outboard with a 48" leg and a 30" wheel for new displacement and semi-displacement designs.
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Old 05-24-2018, 10:16 AM   #144
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And now Yamaha ups the game with a 425 hp XTO Offshore, "Massive Power for 50-foot-plus boats" in their words. Of course they don't mean a single engine for 50+, but when used as one of a set of two or three or four most likely. Doesn't have your 48" shaft, but does have a 35" available. Yes, Seven Marine still tops them, but Yamaha is mainstream.

First place you'll see it will likely be 60' or so Center Consoles. Second likely an express cruiser of some sort in the 50' range.
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Old 05-25-2018, 09:49 PM   #145
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Now Hydra Sports (or HCB) has introduced a 65' center console outboard. The first is powered with five 627's.
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Old 05-25-2018, 10:03 PM   #146
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Seems like there would be a market (a small one) for 300 HP outboards geared low, spinning big props. (I would have said wheels but props are more proper for outboards.)

Their are many commercial applications as well as trawler-type propportunities.
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Old 05-26-2018, 02:18 AM   #147
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and here is your answer to all things 'outboard'.
Yamaha Announces New 425-HP V8

I'll bet that will make your outboard trawler exceed your hull speed.
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Old 06-07-2018, 11:31 AM   #148
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Saw this in Gulfport this weekend. 700 horse. No-one aboard - would have liked to discuss what his experience has been.
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Old 06-07-2018, 11:33 AM   #149
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That worked well - again:
Attached Thumbnails
Outboard Trawler GPT.jpg  
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Old 06-07-2018, 11:51 AM   #150
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That worked well - again:
Agree, that would be interesting to learn more about. Looks like professional work. Because of the weight transfer aft, I wonder whether they had to raise the boot stripe to make it appear trimmed out properly at rest.
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Old 06-07-2018, 12:05 PM   #151
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Good points. By my eyeball, looking at shear line and the rest of the boat, she lies pretty straight (level). Wonder what's in the engine room. About 800# each (dry) cantilevered out a couple of feet. I'll be in GPT for a couple of weeks - I'll try to catch up with the owner.
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Old 06-07-2018, 12:12 PM   #152
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Did you notice if it steered with the ouboards or the original rudder(s) ?
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Old 06-07-2018, 12:16 PM   #153
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The weight and balance might be a wash depending on the original engines and tanks. A pair of diesels and marine gearboxes are not light, even gassers, it just depends on where the weight was removed. Remember that they probably pulled the shafts and rudders along with the old props and that is all as far aft as you can get and still be inside the hull. If there was a center.ine tank in the stern the improved fuel economy might let you keep it empty which would help too.
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Old 06-07-2018, 12:21 PM   #154
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Did you notice if it steered with the ouboards or the original rudder(s) ?
It would need to the be by the outboards. The rudders would be in front of the prop thrust and have very little effect. I suspect they removed the props, shafts, and struts to reduce drag.

Must be a massive storage locker in the old engine compartment. We call our guest cabin the 'walk-in closet'. I'd bet before long, we'd be calling the old engine compartment the 'basement'.
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Old 06-07-2018, 01:08 PM   #155
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Looks good but where do you put the Weaver davits and dinghy ?
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Old 06-07-2018, 01:26 PM   #156
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Looks good but where do you put the Weaver davits and dinghy ?
Not all of us are fans of Weaver davits...
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Old 06-07-2018, 01:32 PM   #157
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Mercruiser 350's are about 900 lbs each. Yamaha 200's are about 500 lbs each for a savings of 800 pounds.

Getting rid of the transmission, rudders, shafts, thru hulls, logs and props probably saves another 500-600 pounds.

A lot to like with a 1300-1400 pound haircut.
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Old 06-07-2018, 02:14 PM   #158
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That worked well - again:
What kind of boat - Pacemaker? Uniflite?

Swim step is really low to water... wonder if that is because of engine removal weight and cantilevered weight of o/b's? Maybe they did raise boot stripe to make things look correct.

Big-Problem for me and wife would be no more use of swim platform for swimming and loading onto or out of our tow behind runabout. Unless there were great handling advantage and way less fuel usage I'd pick the inboards.

O/b's would basically be in my way too much for other items of fun. also, back into a pier and see how much that costs -
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Old 06-07-2018, 02:27 PM   #159
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From my look, that's not so much a "swim step" as a cover for the substantial structure under it. You can't see it well in the pic, but the vertical white engine attachment point is the end of a complex structural shape that, I imagine, extends well forward under the hull for attachment.

At roughly $30k buy per engine, plus inboard engine and running gear removal, structural mods, installation - looks like a $100k in it. Assuming gas V8s were original, he could have installed Jasper rebuilds and reworked the trannies for 20% of the cost.
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Old 06-07-2018, 02:27 PM   #160
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Lots of outboards are run on Armstrong brackets and the setback allows for a useable swim step/boarding platform although you have to access from either side and not from directly astern.

The Op said there were 700hp and that implies 350's and not 200's which are probably heavier, then again it may have had big blocks instead of small blocks if they were gassers.
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