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Old 05-05-2013, 08:46 PM   #1
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Boat name: The Nashers Revenge!
Boat make: Ocean 6.25
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Transom Mods

One for the boat builders.

When I rebuilt my boat I found a really good deal on an XL shaft Suzuki DT200EFI. I also wanted to raise the engine up on the transom as the old 150VRO that came off was very low in the water.

Rather than rebuild the transom in wood and fibreglass I added a 15mm thick Aluminium plate bolted to the transom and filled the original cutout in the transom with a piece of 4 x 2 Ali box section.

The two images below show the drawing I made beforehand and what it ended up like.

I'm going to whip the engine off for some tidying up in a few weeks and am considering putting it back together without the 4 x 2 box section so the top engine bolts will just be through the 15mm Ali plate.

Am I making a mistake? Or will it still be strong enough?

Thanks

Nasher.
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Old 06-05-2013, 07:03 AM   #2
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Xl shaft

Quote:
Originally Posted by Nasher View Post
One for the boat builders.

When I rebuilt my boat I found a really good deal on an XL shaft Suzuki DT200EFI. I also wanted to raise the engine up on the transom as the old 150VRO that came off was very low in the water.

Rather than rebuild the transom in wood and fibreglass I added a 15mm thick Aluminium plate bolted to the transom and filled the original cutout in the transom with a piece of 4 x 2 Ali box section.

The two images below show the drawing I made beforehand and what it ended up like.

I'm going to whip the engine off for some tidying up in a few weeks and am considering putting it back together without the 4 x 2 box section so the top engine bolts will just be through the 15mm Ali plate.

Am I making a mistake? Or will it still be strong enough?

Thanks

Nasher.
An XL shaft will be running very deep looking at your transom what is the height from the keel to the top of the plate
And keel to the top of the transom cut out
Is the shaft 25"or 30"?
And how thick is the transom without the plate?
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Old 06-05-2013, 08:09 PM   #3
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Country: England
Location: Just North of Pompey
Occupation: Procurement manager
Interests: Boats and Bikes
Boat name: The Nashers Revenge!
Boat make: Ocean 6.25
Engines: Suzi-wong 200HP EFI
Cruising area: Solent

Join Date: Dec 2004
Location: Just North of Pompey
Posts: 165
Russ

Thanks for your reply.

The engines Anti-cavitation/Ventilation plate sits about 1/2inch above the keel as I set it up, it's a 25inch leg.

It's been running fine at that depth for several years, I'm not looking to change the height setting just to simplify the installation whilst I have the engine off.

The transom is @2inch thick, and the Ali plate is 15mm thick.

Nasher
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Old 07-05-2013, 06:50 AM   #4
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Transom

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Originally Posted by Nasher View Post
Russ

Thanks for your reply.

The engines Anti-cavitation/Ventilation plate sits about 1/2inch above the keel as I set it up, it's a 25inch leg.

It's been running fine at that depth for several years, I'm not looking to change the height setting just to simplify the installation whilst I have the engine off.

The transom is @2inch thick, and the Ali plate is 15mm thick.

Nasher
Hi nasher you should be ok to remove the box section many engines have been adjusted just on the line of bolt holes on the saddle but I would say the bolts should not be threaded in the transom as this can over time start deforming the holes in the transom.
Hope this helps
Russ
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Old 07-05-2013, 07:08 AM   #5
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Missed something

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Originally Posted by russ williams View Post
Hi nasher you should be ok to remove the box section many engines have been adjusted just on the line of bolt holes on the saddle but I would say the bolts should not be threaded in the transom as this can over time start deforming the holes in the transom.
Hope this helps
Russ
Sorry forgot to say you should try to get all bolts though transom by using the second bolt hole down on the saddle if possible .
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Old 07-05-2013, 07:06 PM   #6
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Country: England
Location: Just North of Pompey
Occupation: Procurement manager
Interests: Boats and Bikes
Boat name: The Nashers Revenge!
Boat make: Ocean 6.25
Engines: Suzi-wong 200HP EFI
Cruising area: Solent

Join Date: Dec 2004
Location: Just North of Pompey
Posts: 165
Russ
Thanks

Don't worry I wouldn't consider tapping the holes in the Ali plate, I'd use short bolts and nuts.

Unfortunately all the upper bolt positions fall within the original transom cutout area, so not even the very lowest one would go through the transom.

Most Gill brackets I've seen are made of thinner Aluminium than my 15mm plate, but I'm worried as the forces involved in my case are spread differently than when a Gill bracket is mounted.

Nasher.
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Old 08-05-2013, 08:32 AM   #7
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transom

Quote:
Originally Posted by Nasher View Post
One for the boat builders.

When I rebuilt my boat I found a really good deal on an XL shaft Suzuki DT200EFI. I also wanted to raise the engine up on the transom as the old 150VRO that came off was very low in the water.

Rather than rebuild the transom in wood and fibreglass I added a 15mm thick Aluminium plate bolted to the transom and filled the original cutout in the transom with a piece of 4 x 2 Ali box section.

The two images below show the drawing I made beforehand and what it ended up like.

I'm going to whip the engine off for some tidying up in a few weeks and am considering putting it back together without the 4 x 2 box section so the top engine bolts will just be through the 15mm Ali plate.

Am I making a mistake? Or will it still be strong enough?

Thanks

Nasher.
what you have done there looks strong and tidy, just out of interest why take the box section out ?
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Old 08-05-2013, 10:18 PM   #8
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Country: England
Location: Just North of Pompey
Occupation: Procurement manager
Interests: Boats and Bikes
Boat name: The Nashers Revenge!
Boat make: Ocean 6.25
Engines: Suzi-wong 200HP EFI
Cruising area: Solent

Join Date: Dec 2004
Location: Just North of Pompey
Posts: 165
Deepvee.
I've actually been considering it myself over the last two days, and thinking what I'll actually achieve. The act of typing it on here and thinking about the detail has focused my mind a little.

My thoughts on removing the box section were really just to simplify the installation whilst I have the engine off to do some other work.

On the other hand removing it will create some more work tidying up what's underneath.

I'll probably make my mind up for certain whilst I'm bolting it back together, but am interested in what more experienced people than myself have to say about it.

Nasher.
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Old 08-05-2013, 11:40 PM   #9
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Country: Ireland
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Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
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Looks good, I'd leave the box section in though, as you say will keep it tidy and also ad some stiffness.

Just one other thing to consider, a 25" motor is pretty high on the transom, this may cause some handling issues. try and find a 20" leg for your motor if you can. the boat will probably handle a lot better with this.

What make of hull is it?
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Old 08-05-2013, 11:52 PM   #10
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Country: England
Location: Just North of Pompey
Occupation: Procurement manager
Interests: Boats and Bikes
Boat name: The Nashers Revenge!
Boat make: Ocean 6.25
Engines: Suzi-wong 200HP EFI
Cruising area: Solent

Join Date: Dec 2004
Location: Just North of Pompey
Posts: 165
Thanks HS

It doesn't look that high at rest.

The engine I took off before doing the mod was a Long shaft 150VRO that was constantly swamped and at rest sat very low in the water.

I'm not sure I want to admit what the hull is on here for fear of being mocked.

Oh who cares.
It's a Windsor Brothers (Ocean) 6.5M Rib, which is a heavy commercial spec hull with what would be termed on here - Good seakeeping properties that compromise it's speed potential - not really a performance beast at all, but tops out at @48knots with the DT200 and a light load.

Nasher.
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Old 01-10-2016, 02:51 PM   #11
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Country: uk
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Boat make: 170 bayliner
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hi hydrostream I have been told by fabricater not to mix ali with stainless ie bolts throu plate etc as it causes ali to rot away is this right
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