Reply
 
Thread Tools Search this Thread
 
Old 22 November 2011, 20:19   #1
Member
 
TomKat's Avatar
 
Country: Ireland
Town: Bangor
Boat name: Lencraft 4.8m
Make: Lencraft
Length: 4m +
Engine: DT55HP Suzuki
Join Date: Jul 2011
Posts: 469
A Frame design for a 4.8m RIB

Hi

I get a fair bit of SS fabrication work done and am very friendly with the them, they will rattle me out an A Frame (I'll buy the metal!).

Any handily made tidy looking designs about? A pic would be useful if anyone can point me in the right direction. They are making me a jockey seat frame out of 1" 316 SS, I'm guessing that would be too flimsy for an A Frame, any opinions?

(Primarily want one cos they look cool but will stick nav lights on in case I end up working on my DT55 in the Irish Sea in the dark!)
__________________
TomKat is offline   Reply With Quote
Old 22 November 2011, 21:53   #2
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
1" OD would be ok for a braced double frame, or 2" OD for a chunky single section also looks good.

Make sure you design it tall enough to allow enough room to remove the outboard lid with the motor trimmed down, if you plan on doing any at-sea maintenance.
__________________
Downhilldai is offline   Reply With Quote
Old 22 November 2011, 21:56   #3
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
__________________
Downhilldai is offline   Reply With Quote
Old 22 November 2011, 21:59   #4
Member
 
hamster's Avatar
 
Country: UK - England
Length: 4m +
Join Date: Aug 2006
Posts: 196
Also make sure your nav lights are high enough not to be obscured by the bow if the boat, console or people stood driving etc.

On a lot of boats you can't see the nav lights when they are coming towards you half on the plane with the bow in the air and people stood up. Kind of defeats the point of having lights in the first place of people can't see you coming towards them!

Sent from my iPhone using Rib.net
__________________
Freelance skipper, RYA Powerboat Trainer and Advanced Examiner
hamster is offline   Reply With Quote
Old 22 November 2011, 22:32   #5
Member
 
TomKat's Avatar
 
Country: Ireland
Town: Bangor
Boat name: Lencraft 4.8m
Make: Lencraft
Length: 4m +
Engine: DT55HP Suzuki
Join Date: Jul 2011
Posts: 469
cheers chaps - good tips there!
__________________
TomKat is offline   Reply With Quote
Old 23 November 2011, 02:30   #6
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
If the guys you're working with can do some bending, you can flare the bottom of the A-frame out over the tubes. That will put your lights further out to the sides, and give you more room to lean over the transom, should you need to replace or clear a prop while on the water.

jky
__________________
jyasaki is offline   Reply With Quote
Old 23 November 2011, 07:18   #7
Member
 
Jizm's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,804
This is the double one I had for my 4.8m Tornado.
Attached Thumbnails
Click image for larger version

Name:	fameon%20frnt.jpg
Views:	294
Size:	62.8 KB
ID:	64041  
Jizm is offline   Reply With Quote
Old 23 November 2011, 07:19   #8
Member
 
Jizm's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,804
From the stern with electrics fitted....
Attached Thumbnails
Click image for larger version

Name:	DSCF0042comp.jpg
Views:	289
Size:	53.7 KB
ID:	64042  
Jizm is offline   Reply With Quote
Old 23 November 2011, 09:06   #9
Member
 
Nick Hearne's Avatar
 
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,252
I had one made up to my drawing & I'm very happy with the result
Attached Thumbnails
Click image for larger version

Name:	A frame (Large).jpg
Views:	358
Size:	34.9 KB
ID:	64043   Click image for larger version

Name:	IMG_0148 (Large).jpg
Views:	282
Size:	72.4 KB
ID:	64044   Click image for larger version

Name:	IMG_0151 (Large).jpg
Views:	236
Size:	81.9 KB
ID:	64045   Click image for larger version

Name:	IMG_0146 (Large).jpg
Views:	261
Size:	68.0 KB
ID:	64046   Click image for larger version

Name:	IMG_0149 (Large).jpg
Views:	288
Size:	80.1 KB
ID:	64047  

__________________
Member of the Ribeye supporters club!!!
Member of Bombard 380 Aerotec club
Member of SR4 club
Nick Hearne is offline   Reply With Quote
Old 23 November 2011, 09:24   #10
Member
 
TomKat's Avatar
 
Country: Ireland
Town: Bangor
Boat name: Lencraft 4.8m
Make: Lencraft
Length: 4m +
Engine: DT55HP Suzuki
Join Date: Jul 2011
Posts: 469
like all of those! Decisons decisons! I am calling in to see them later about some paid work so will print a few pics out and see what is easiest for them. I like the ways yours just mounts on the transom Jizm as avoids any deck issues.

Do you tow skiers etc from the tow ring on yours Nick?
__________________
TomKat is offline   Reply With Quote
Old 23 November 2011, 09:37   #11
Member
 
Nick Hearne's Avatar
 
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,252
Quote:
Originally Posted by TomKat View Post
Do you tow skiers etc from the tow ring on yours Nick?
Yes I can ski from this no problem & I have towed other boats from it too!
I have not tried it but recon you could pick the whole boat up by the Aframe it is that well built
__________________
Member of the Ribeye supporters club!!!
Member of Bombard 380 Aerotec club
Member of SR4 club
Nick Hearne is offline   Reply With Quote
Old 23 November 2011, 09:51   #12
Member
 
TomKat's Avatar
 
Country: Ireland
Town: Bangor
Boat name: Lencraft 4.8m
Make: Lencraft
Length: 4m +
Engine: DT55HP Suzuki
Join Date: Jul 2011
Posts: 469
cool - looks pretty solidly made!
__________________
TomKat is offline   Reply With Quote
Old 23 November 2011, 10:29   #13
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,667
Quote:
Originally Posted by jyasaki View Post
If the guys you're working with can do some bending, you can flare the bottom of the A-frame out over the tubes. That will put your lights further out to the sides, and give you more room to lean over the transom, should you need to replace or clear a prop while on the water.

jky
...and allows space for an Aux!
__________________
9D280 is offline   Reply With Quote
Old 23 November 2011, 10:50   #14
Member
 
TomKat's Avatar
 
Country: Ireland
Town: Bangor
Boat name: Lencraft 4.8m
Make: Lencraft
Length: 4m +
Engine: DT55HP Suzuki
Join Date: Jul 2011
Posts: 469
forgot about the aux! flared is the way to go!
__________________
TomKat 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




All times are GMT. The time now is 09:29.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.