Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 05-05-2013, 08:46 PM   #1
Registered User
 
Nasher's Avatar
 
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: 128
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.
Attached Thumbnails
Click image for larger version

Name:	Transom mod.jpg
Views:	209
Size:	64.9 KB
ID:	38265   Click image for larger version

Name:	Transom Mod 2.jpg
Views:	253
Size:	99.4 KB
ID:	38266  
__________________

__________________
Heaven doesn't want me, and Hell is afraid I'll take over
Nasher is offline   Reply With Quote
Old 06-05-2013, 07:03 AM   #2
Registered User
 

Join Date: Sep 2011
Posts: 174
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?
__________________

russ williams is offline   Reply With Quote
Old 06-05-2013, 08:09 PM   #3
Registered User
 
Nasher's Avatar
 
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: 128
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
__________________
Heaven doesn't want me, and Hell is afraid I'll take over
Nasher is offline   Reply With Quote
Old 07-05-2013, 06:50 AM   #4
Registered User
 

Join Date: Sep 2011
Posts: 174
Transom

Quote:
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
russ williams is offline   Reply With Quote
Old 07-05-2013, 07:08 AM   #5
Registered User
 

Join Date: Sep 2011
Posts: 174
Missed something

Quote:
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 .
russ williams is offline   Reply With Quote
Old 07-05-2013, 07:06 PM   #6
Registered User
 
Nasher's Avatar
 
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: 128
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.
__________________
Heaven doesn't want me, and Hell is afraid I'll take over
Nasher is offline   Reply With Quote
Old 08-05-2013, 08:32 AM   #7
Registered User
 
deepvee's Avatar
 
Country: england
Location: surrey
Engines: none at the mo
Cruising area: south coast

Join Date: Dec 2011
Location: surrey
Posts: 472
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 ?
deepvee is offline   Reply With Quote
Old 08-05-2013, 10:18 PM   #8
Registered User
 
Nasher's Avatar
 
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: 128
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.
__________________
Heaven doesn't want me, and Hell is afraid I'll take over
Nasher is offline   Reply With Quote
Old 08-05-2013, 11:40 PM   #9
Registered User
 
Hydrostream's Avatar
 
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
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.
Cruising area: Malahide, Dublin

Join Date: May 2004
Location: Dublin
Posts: 1,803
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?
__________________
www.powermarine.ie

[SIGPIC][/SIGPIC]
Hydrostream is offline   Reply With Quote
Old 08-05-2013, 11:52 PM   #10
Registered User
 
Nasher's Avatar
 
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: 128
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.
__________________
Heaven doesn't want me, and Hell is afraid I'll take over
Nasher is offline   Reply With Quote
Old 01-10-2016, 02:51 PM   #11
Registered User
 
Country: uk
Location: essex
Occupation: s/e motor mechanic
Interests: watersports squash
Boat name: floozie
Boat make: 170 bayliner
Engines: 125 mercury force
Cruising area: essex river crouch

Join Date: Sep 2016
Location: essex
Posts: 30
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
__________________

boatpain is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 04:47 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×