Reply
 
Thread Tools Search this Thread
 
Old 19 April 2012, 05:22   #1
Member
 
actions's Avatar
 
Country: UK - England
Town: Herne Bay
Boat name: Red May
Make: Zodiac
Length: 4m +
Engine: 40hp Honda 4 Stroke
MMSI: Is quite long
Join Date: Jun 2010
Posts: 653
Send a message via Skype™ to actions
A frame Idea for little rib

Now before i start, i'll have to admit, i'm no artist and no computer whizz. So please forgive my drawing attempt.

I've been thinking about adding an a frame to the rib for sometime but after hours of searching can not find anyone that does an a frame for the Pro 420.

I'm looking at getting one manufactured at the local metal works, mainly as i want to add Nav lights. Plus it will be another position for the gopro

You'll note that i've got to come across the tubes due to the steering arm taking up most of the transom area and I cant go any higher as i still want it to go in the garage and the height of the VHF pole is my maximum.

So my questions are -
1. What size of tube should i use to ensure its strong?
2. Should it be bolted through the transom, if so what size bolts? (VHF pole is currently only screwed)
3. Anyone know a rough cost of doing this so I dont get ripped off? Of course i'll fit myself so just after machining and product costs.
4. Will that (very rough) image be stable enough or should i add a second fixing somewhere?
Attached Thumbnails
Click image for larger version

Name:	Rib A frame idea.jpg
Views:	874
Size:	158.6 KB
ID:	67311  
__________________

__________________
actions is offline   Reply With Quote
Old 19 April 2012, 06:25   #2
Member
 
Glow's Avatar
 
Country: UK - England
Town: Lancashire
Boat name: Trigger Happy
Make: Bombard Aerotec
Length: 3m +
Engine: Tohatsu 20hp
MMSI: 235907196
Join Date: Apr 2012
Posts: 188
There is one on eBay very similar, item no 290424135018. It's up for 149 plus post though
__________________

__________________
Midlands and North West S.I.B. Club member.
Glow is offline   Reply With Quote
Old 19 April 2012, 06:44   #3
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,021
Having the bottom curve out over the tubes before going up is, IMO what causes many a-frames to have too much flex in them. Like the Humber a-frames for example, I think it was Dr Doof's that was well documented on here.
__________________
martini is offline   Reply With Quote
Old 19 April 2012, 07:40   #4
Member
 
actions's Avatar
 
Country: UK - England
Town: Herne Bay
Boat name: Red May
Make: Zodiac
Length: 4m +
Engine: 40hp Honda 4 Stroke
MMSI: Is quite long
Join Date: Jun 2010
Posts: 653
Send a message via Skype™ to actions
Quote:
Originally Posted by martini
I think it was Dr Doof's that was well documented on here.
Argh yea, i remember that thread now you mention it.

There's not a lot of point in me doing it if its going to flex. I was after it being as solid as possible. I Might have to go back to the drawing board then as lack of transom space around the engine stuffs me a little. A bigger boat it is....... If only

Another option i suppose could be bolting to the transom and coming out from the transom before we hit the steering arm, therefore losing the curve over the tubes. Might make it a bit shopping trolley like though??????.

Ill try another splendid drawing attempt.
__________________
actions is offline   Reply With Quote
Old 19 April 2012, 07:54   #5
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: 3,242
I had one mad up to my drawing last year & very happy with it
Could you not bend it out passed the steering ram or pack it out?

Sorry did not make that clear I mean bring it forward of the transom!
Attached Thumbnails
Click image for larger version

Name:	A frame (Large).jpg
Views:	997
Size:	57.4 KB
ID:	67313   Click image for larger version

Name:	Picture or Video 105.jpg
Views:	335
Size:	70.9 KB
ID:	67314   Click image for larger version

Name:	Picture or Video 106.jpg
Views:	388
Size:	119.8 KB
ID:	67315   Click image for larger version

Name:	Picture or Video 108.jpg
Views:	437
Size:	72.4 KB
ID:	67316  
__________________
Member of the Ribeye supporters club!!!
Member of Bombard 380 Aerotec club
Member of SR4 club
Nick Hearne is offline   Reply With Quote
Old 19 April 2012, 07:55   #6
RIBnet supporter
 
Ian M's Avatar
 
Country: UK - England
Town: New Milton
Boat name: Jianna
Make: Osprey
Length: 6m +
Engine: 200 E-TEC
MMSI: 235076954
Join Date: Sep 2004
Posts: 1,933
Have to admit to being a fan of the 'A' frame To my mind you need it to be as solid as possible - it is surprising what they are used for. Mounting lights etc is only the start; ask Nos where he goes for relief. Wouldn't want to feel unsafe when its all hanging out
__________________
Ian

Dust creation specialist
Ian M is offline   Reply With Quote
Old 19 April 2012, 08:04   #7
Member
 
actions's Avatar
 
Country: UK - England
Town: Herne Bay
Boat name: Red May
Make: Zodiac
Length: 4m +
Engine: 40hp Honda 4 Stroke
MMSI: Is quite long
Join Date: Jun 2010
Posts: 653
Send a message via Skype™ to actions
Quote:
Originally Posted by Nick Hearne View Post
I had one mad up to my drawing last year & very happy with it
Could you not bend it out passed the steering ram or pack it out?
Nick, Thanks very much for that and if i can get something like that i would be very happy. I think i could adapt that very slightly to move out from the arm and therefore avoid the bend over the tubes. Thanks

Whats the size of tube you have used as it looks very strong.

Quote:
Originally Posted by Ian M View Post
Wouldn't want to feel unsafe when its all hanging out
I couldnt agree more, having made use of the hand rail on the console the A frame would assist greatly.
__________________
actions is offline   Reply With Quote
Old 19 April 2012, 08:11   #8
Member
 
actions's Avatar
 
Country: UK - England
Town: Herne Bay
Boat name: Red May
Make: Zodiac
Length: 4m +
Engine: 40hp Honda 4 Stroke
MMSI: Is quite long
Join Date: Jun 2010
Posts: 653
Send a message via Skype™ to actions
Quote:
Originally Posted by Glow View Post
There is one on eBay very similar, item no 290424135018. It's up for 149 plus post though
Thanks for the link. Certainly gives an idea on price.
__________________
actions is offline   Reply With Quote
Old 19 April 2012, 08:41   #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: 3,242
Quote:
Originally Posted by actions View Post
Nick, Thanks very much for that and if i can get something like that i would be very happy. I think i could adapt that very slightly to move out from the arm and therefore avoid the bend over the tubes. Thanks

Whats the size of tube you have used as it looks very strong.



I couldnt agree more, having made use of the hand rail on the console the A frame would assist greatly.
It is out of 5cm & yes it is very strong as I wanted & use it for water skiing from & it puts up with pulling me!
+ mine has replaced the original transom supports you get in the Searider so again had to be strong, I recon you could pick the boat up with it! I have now fitted lights to it too.
__________________
Member of the Ribeye supporters club!!!
Member of Bombard 380 Aerotec club
Member of SR4 club
Nick Hearne is offline   Reply With Quote
Old 19 April 2012, 09:01   #10
Member
 
Country: UK - England
Town: preston
Make: avon
Length: 4m +
Engine: 40 tohatsu
Join Date: Jun 2011
Posts: 5
I made one up out of plastic pipe from wickes diy then took it to the steel fabricators and had it copied in stainless to get the design right,this may help.
__________________

__________________
john lee 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 00:02.


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