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Old 12-11-2012, 07:37 PM   #101
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Well, here is one guy who thought it was worth trying on something quite a bit north of 30,000 lbs

Looks pretty safe, he did put 2 straps on the gas tank
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Old 12-11-2012, 08:13 PM   #102
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Steve I made that pic real big and I'm quite sure the hull goes all the way back like a Nordic Tug. So the OB could be bolted directly to the hull.

If the're using it as a prime mover it's a bad application as the prop diameter will be way too small. Not much thrust will result. But removing the engines of the original boat would make up for some inefficiency.

Why else would somebody put a big OB on a boat like that and run the boat w the OB in the down position?

But I'm just guess'in.

CP that gas tank's prolly too small.
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Old 12-11-2012, 08:24 PM   #103
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CP that gas tank's prolly too small.
I agree. They should have a large rectangular tank in the horizontal aspect, thereby doing double duty by replacing the bimini over the flybridge.
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Old 12-11-2012, 08:48 PM   #104
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A viable option that has been only mentioned a couple of times is to side-tie a dingy to the cruiser and use its outboard in an attempt to get to safe haven. The dinghy's outboard could be locked, tied, or clamped in position so that steering could be accomplished with the cruiser's rudder. Side-tying may not be advisable in rougher water but if the water conditions are right it may be more effective than trying to tow the cruiser with the dinghy.
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Old 12-11-2012, 09:31 PM   #105
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Ron,
I have been chomping at the bit to respond. I am twixt between you are just playing with the forum knowing you are tweaking those of us who actually utilize the subject as a reality or you truly believe your prognostications.(Said with good humor

Your 31 foot Camano is one of the most suited boats for our part of the world. We don't have any number of them as residents, as I mentioned in prior post. That said, they are a pure Southeast Alaska candidate for near perfect.

The Camano as well, is the perfect candidate for a stern mounted outboard.
I will give you that OB. It is the 9.9 Hi-thrust Yamaha. These are geared in such a combination to equal the thrust of a 18 hp standard OB of comparable size. This is the motor I had on our last boat, a 28 foot 19,000# converted harbor tug. We pushed the boat at 4.5 Knts by GPS as an average, when we used it to bring ourselves home and often during short moves in the fishing grounds.
The data I am giving forum is actual data, not subject to conjecture or maybe so. It is fact. Not only that, in our local fleet, the 9.9 Yamaha is the most popular motor for the same use secondary to a trolling motor.
We Alaskans all calculate that at some point in time we will require the use of this motor as our insurance at time of need.
What I am attempting to project, is until I read the forum on the question, with as many years under my life vest on the water, had the death of challenge to the use of the OB become as it has here. Now, I understand the straw-man, "The size of the boat in relation to the size of the OB being considered-But"."Water conditions- But" "Will be subject to Pooping-But"
In the case of your particular boat, the perfect candidate for such an application is ignore the potential of the safety factor in having installed one Visit our area of the world, break down and when a local comes alongside to assist, I would not be surprised to have that person quietly suggest that you consider such an investment as he gives you a helping hand. We do that here, all it takes is getting our attention. (Another story- later regarding visiting boats from America, passing by broke down mariners)

As to the argument regarding a required high horse powered engines for 35-40 foot boats. It seems reasonable that a boat in that range will have a sufficient size auxiliary boat on-board with a horse powered engine sufficient to either tie along side or tow the boat into a safe harbor. I don't recall seeing boats of the size with OB's on the stern unless like the photo in an above post depicted.
There are a couple locally I know of- 30-40 footers who have removed the inboards and replaced with big OB 150-300 hp. The fuel efficiency of the new larger OB's meet the consumption of the original inboards with ease of installation and benefit of obtaining added space. Even there, in one case the large OB is a 300 plus hp. the owner included a 25 hp Honda as an auxiliary!

I want to add another remark that you made Ron. As it is apparent that you have not undertaken or had an opportunity to operate under a "Git-a-Home OB application, allow me to assure you that you can steer a displacement hull under OB power with the vessel's rudder. You will suffer control issues in the confinement of the harbor when you arrive, however, at that time one is required to physically use the tiller of the OB as you will be shifting the throttle/gear shift as required. During the voyage TO the harbor you will be quite able to maneuver the boat. Trust me, I have done it on one long trip back on the OB and twice in short shots to arrive at a secure anchorage.

I am presently in the learning stage of how to post a photo in a blog site.When I am able I will submit a photo of the boat where all of this exercise was accomplished.

Best Regard,
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Old 12-11-2012, 09:36 PM   #106
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That is "Depth" of challenge, not "Death" Spell check-

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Old 12-11-2012, 09:39 PM   #107
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I am presently in the learning stage of how to post a photo in a blog site.When I am able I will submit a photo of the boat where all of this exercise was accomplished."
What might work depending on the nature of the blog site is to select the photo in the blog, particularly if doing so expands it to a larger size, and save the photo to your desktop (save as, save target as, etc.). At that point you should be able to use the forum's attachment management functions to browse for and select the photo from your desktop to paste into a post.
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Old 12-11-2012, 09:44 PM   #108
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In addition in anticipation of the "But" in heavy weather you can't use the displacement boat rudder" In response, if the damn weather is howling, I will double down guarantee that you WILL TRY before you go aft and physically stand by the OB tiller.
By the way, there are two methods of steering an auxiliary. There is on the market, extension handles that are dandy for the purpose, or in the case of many up here, we add a secondary steering station aft complete with throttle/shift control to facilitate using the OB, during fishing, as well in the need of emergency git a home. Just wanted to clarify prior to all the "Butts"

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Old 12-11-2012, 09:49 PM   #109
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Thanks Marin, How about from an email? I have a couple that were sent to me of our boat. Is there a process?
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Old 12-11-2012, 09:50 PM   #110
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Marin, don't answer, keep the forum for the subject. My email is ajohnson@kpunet.net if you choose. AMJ
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Old 12-11-2012, 09:55 PM   #111
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Here's a 15hp Honda on the back of a 36-38' trawler. Taken the same day as I took the other ones for Eric.
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Old 12-11-2012, 10:33 PM   #112
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It's going to be mighty hard to steer as well.
One could use a bow thruster sparingly.
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Old 12-11-2012, 11:20 PM   #113
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[QUOTE=manyboats;119033]Steve I made that pic real big and I'm quite sure the hull goes all the way back like a Nordic Tug. So the OB could be bolted directly to the hull.


Yes I believe you are right and the hull is extended.
Now I wish I had called them on vhv for details but didn't pay them much mind at the time I hope to be down there in the spring maybe I'll see them out on the water and get another chance.
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Old 12-13-2012, 09:38 AM   #114
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I saw something like that on ebay once. Cheap. They made a big deal about how much interior space was gained, but I suspect once they did a sea trial, they decided that selling it was the best option..
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Old 12-14-2012, 07:15 AM   #115
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Here's a 15hp Honda on the back of a 36-38' trawler.

Perhaps it has the ability to turn 90 deg and work as a stern thruster?

No tiny ON time limits with an outboard!
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Old 12-15-2012, 03:04 PM   #116
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Outboard useful in calm condition

I made a bracket and place my 8 hp outboard on the back of my 42 steel trawler the boat is about 35000#. The trial in calm conditions were 3 knots 1/2 throttle and 4.5 knots at full throttle. I was very happy with this until I tried it in 3-4 ft chop, the prop would cavity and I was not thrilled by the potential for submerging the of outboard. The setup is not a lost cause but would but I'm not sure it would save your boat from serious trouble.
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Old 12-15-2012, 09:03 PM   #117
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This has really gotten silly. It's obvious that a small outboard can be an effective get home engine. As the boat gets bigger and the conditions get worse it is less effective.

Marin, your story of the current being so strong that the boat couldn't be kept off the rocks with 50 hp is scary but I think very few of us ever see currents like that. In less chalenging conditions the 50 hp outboard would have been very effective.
lots of trawlers like willards may only have 50hp or close to it to begin with. I've never been in that situation but why couldnt you drop the hook that ought to keep u off the rocks?
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Old 12-15-2012, 10:53 PM   #118
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floyd wrote;

"I've never been in that situation but why couldnt you drop the hook that ought to keep u off the rocks?"

Indeed .. that's one of the reasons I have a 430' anchor rode.

And yes my Willard has about 40hp and is a full disp boat so it wouldn't even need 10hp to move along quite smartly. I'm thinking 5 or 6hp should do nicely.

And I suspect 10hp should push Ron's Camano Troll plenty fast enough as it probably weighs almost half of what the Willard does.
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Old 12-15-2012, 11:24 PM   #119
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Here's a 15hp Honda on the back of a 36-38' trawler.

Perhaps it has the ability to turn 90 deg and work as a stern thruster?

No tiny ON time limits with an outboard!
I don't think this one turns 90. But now that you mention it, my 4hp bow thruster moves my boat side ways rather quickly, I would suspect a 9.9 kicker would move it just fine pointy end first...
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Old 12-16-2012, 05:24 PM   #120
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floyd wrote;

"I've never been in that situation but why couldnt you drop the hook that ought to keep u off the rocks?"

Indeed .. that's one of the reasons I have a 430' anchor rode.

And yes my Willard has about 40hp and is a full disp boat so it wouldn't even need 10hp to move along quite smartly. I'm thinking 5 or 6hp should do nicely.

And I suspect 10hp should push Ron's Camano Troll plenty fast enough as it probably weighs almost half of what the Willard does.

Thank you.
We in general myself included tend to over kill everything. There is no need for a zillion horse power unless one has a desire to support the oil industry in most applications. I did much experimentation with my last searay and what i learned was that for best economy i needed to run at 3,000rpm 32-4 mph or displacement speed of 900-1200rpm at about 6-7mph. At those two points i used the least fuel per statute mile with the displacement fuel economy being the better by far of the two. Well, when i sold my lasst ray i left the log book in here so cannot list here the exact numbers. What i can say is that puttin along is the best for ride quality and fuel economy however i found it impossible to putt in a almost 55mph boat that felt so good when she was boiling water.

I also found that my dinghy motor would propel my ray with little effort at 2-3mph. If i opened up the little motor she would boil lots of water but no speed gain was evident.

But it was so neat to push her to about 4grand and feel her take a bite of the water handling as light as a feather with instant responce...YAHOOO!!!!!!!!
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