Reply
 
Thread Tools Search this Thread
 
Old 26 March 2013, 16:34   #1
Member
 
johndoe007's Avatar
 
Country: USA
Boat name: T/T Something Bigger
Make: OTECH / Crompton
Length: 7m +
Engine: Yanmar 6LP 315hp
Join Date: Sep 2011
Posts: 127
Soo am getting close here... The USN kept my stainless and although I have pictures and templates off another Otech I decided we could improve upon the design.

I will update as this goes....

I bought the towing bollards off &bay and had then shipped from Australia. They are 316 solid stainless. But they are a little sexier than standard.

Of course the bases were too wide so we cut them down to fit and then welded them onto a reinforcing plate then onto the transom cap.



Sent from my iPhone using Rib.net
Attached Thumbnails
Click image for larger version

Name:	image-1473102567.jpg
Views:	230
Size:	44.7 KB
ID:	78015   Click image for larger version

Name:	image-204556050.jpg
Views:	178
Size:	146.8 KB
ID:	78016  
__________________

__________________
johndoe007 is offline   Reply With Quote
Old 26 March 2013, 17:56   #2
Member
 
biffer's Avatar
 
Country: UK - England
Town: swanwick/hamble
Boat name: stormchaser
Make: custom rib
Length: 8m +
Engine: inboard/diesel
Join Date: Aug 2007
Posts: 3,848
How strong do you reckon that will be
__________________

__________________
biffer is offline   Reply With Quote
Old 26 March 2013, 18:27   #3
Member
 
johndoe007's Avatar
 
Country: USA
Boat name: T/T Something Bigger
Make: OTECH / Crompton
Length: 7m +
Engine: Yanmar 6LP 315hp
Join Date: Sep 2011
Posts: 127
The welder I subcontracted to repairs bridges for the city of New York City. He has it pinned from underneath as well and has said if I rip it off he would be more worried about the transom.

Sent from my iPhone using Rib.net
__________________
johndoe007 is offline   Reply With Quote
Old 26 March 2013, 18:30   #4
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by biffer View Post
How strong do you reckon that will be
Not strong enough to tow with without a lot of bracing (IMO).

I'd be far more worried about the metal of the transom cap tearing than the welds giving way.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 March 2013, 18:46   #5
Member
 
colcreate's Avatar
 
Country: UK - England
Town: Cheshire
Boat name: Gollione
Make: Avon Searider 5.4
Length: 5m +
Engine: 90hp
Join Date: Jun 2010
Posts: 347
RIBase
nice bollards!
__________________
colcreate is offline   Reply With Quote
Old 26 March 2013, 18:52   #6
Member
 
johndoe007's Avatar
 
Country: USA
Boat name: T/T Something Bigger
Make: OTECH / Crompton
Length: 7m +
Engine: Yanmar 6LP 315hp
Join Date: Sep 2011
Posts: 127
Same bollard but we ground off the hole in the resizing. Countersunk a threaded bolt inside it and also welded it to the cap. Compared to what's on the other 7 meters with stock transom caps ill take mine everyday. It's meant for civilian use not a towing service.

Sent from my iPhone using Rib.net
__________________
johndoe007 is offline   Reply With Quote
Old 26 March 2013, 18:58   #7
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
I wouldnt put anything on a transom cap unless it's a small plastic cleat to hold a trunk up without a brace to somewhere solid.The stresses on the bollard/cap securing bolts are all in the wrong direction.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 March 2013, 19:08   #8
Member
 
johndoe007's Avatar
 
Country: USA
Boat name: T/T Something Bigger
Make: OTECH / Crompton
Length: 7m +
Engine: Yanmar 6LP 315hp
Join Date: Sep 2011
Posts: 127
Quote:
Originally Posted by colcreate View Post
nice bollards!
They are being powder coated Monday... It's like waxing but less painful. I am sure your familiar

Sent from my iPhone using Rib.net
__________________
johndoe007 is offline   Reply With Quote
Old 26 March 2013, 19:40   #9
Member
 
johndoe007's Avatar
 
Country: USA
Boat name: T/T Something Bigger
Make: OTECH / Crompton
Length: 7m +
Engine: Yanmar 6LP 315hp
Join Date: Sep 2011
Posts: 127
Quote:
Originally Posted by Nos4r2 View Post
I wouldnt put anything on a transom cap unless it's a small plastic cleat to hold a trunk up without a brace to somewhere solid.The stresses on the bollard/cap securing bolts are all in the wrong direction.
The original design was for just that. A spot to tie the trunks to and for use up against a dock. I am only looking to improve the aesthetics not the functionality.

Sent from my iPhone using Rib.net
__________________
johndoe007 is offline   Reply With Quote
Old 26 March 2013, 19:50   #10
Member
 
johndoe007's Avatar
 
Country: USA
Boat name: T/T Something Bigger
Make: OTECH / Crompton
Length: 7m +
Engine: Yanmar 6LP 315hp
Join Date: Sep 2011
Posts: 127
For reference this is an original.

The major design flaws are its 5 pieces. The cap and 4 separate thru plates.

The ends are kind of pointy and don't do well long term against the tubes..

Soo I created a one piece design.

Sent from my iPhone using Rib.net
Attached Thumbnails
Click image for larger version

Name:	image-1698716058.jpg
Views:	233
Size:	167.3 KB
ID:	78022  
__________________

__________________
johndoe007 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 22:13.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.