A frames

Windchill · 23 August 2006, 23:42

I know this has probably been done to death somewhere, but 15 minutes of searching has done my head in!!

Where can I source a high quality s/s single tube "A" frame like the ones Humber use? Are thre any disadvantages in using single tube to twin?

Who does good twin tube ones?

BogMonster · 23 August 2006, 23:50

Quote:

Originally Posted by Windchill

Where can I source a high quality s/s single tube "A" frame like the ones Humber use?

Humber? I think they'll sell them separately, they certainly sell seats separately because I've just ordered one

Jono Garton · 23 August 2006, 23:56

Hi, new rib???

We have a few produced, like humbers. 316 stainless brushed finish.

Ill post some pics when i get to my other pc or have a look here

http://rib.net/forum/showthread.php?...8&page=4&pp=10

http://rib.net/forum/showthread.php?...ghlight=frames

http://www.rib.net/forum/showthread.php?t=13305

See y soon

Jono

Jono Garton · 23 August 2006, 23:57

Quote:

Originally Posted by BogMonster

Humber? I think they'll sell them separately, they certainly sell seats separately because I've just ordered one

only to fit on Humbers i think

alt · 24 August 2006, 00:44

If you are looking for a single A-Frame, check out ZEPPELIN (French RIB maker)

I live in Ireland, and got one delivered for 300euro (thats about 210 sterling) which is a good price for an A-Frame. The width is adjustable and it comes with nav lights and a mounting plate on top

Brilliant value IMHO! See attatched picture (I miss my RIB!)

Limey Linda · 24 August 2006, 01:12

I am most interested in what most folks believe the intent/purpose of an A frame is as I am in the process of designing one.
1. Fashionable decorative bracket.
2. Storage bracket/platform eg. roof rack for lifejackets etc.
3. Structural element for the vessel for towing, etc.
4. Bracket to mount stuff on.
5. Any other purpose

BogMonster · 24 August 2006, 02:43

Quote:

Originally Posted by Limey Linda

I am most interested in what most folks believe the intent/purpose of an A frame is as I am in the process of designing one.
1. Fashionable decorative bracket.
2. Storage bracket/platform eg. roof rack for lifejackets etc.
3. Structural element for the vessel for towing, etc.
4. Bracket to mount stuff on.
5. Any other purpose

For me - bracket to mount VHF aerial at a reasonable height, and nav lights. I guess a bit of bling on the blunt end looks nice too

Poly · 24 August 2006, 13:42

Quote:

Originally Posted by Limey Linda

I am most interested in what most folks believe the intent/purpose of an A frame is as I am in the process of designing one.
1. Fashionable decorative bracket.
2. Storage bracket/platform eg. roof rack for lifejackets etc.
3. Structural element for the vessel for towing, etc.
4. Bracket to mount stuff on.
5. Any other purpose

Surely if you are designing one - it is to meet your needs rather than everyone elses?

I believe the original concept was as a support for nav lights, ariels etc. Now cosmetic too, generally most people advise against towing with one - so if that is your plan not only do you need to beef it up you need to mount it properly.

The other "serious" application they have is for self righting bags.

You missed handhold whilst peeing over the side - from your list.

jwalker · 24 August 2006, 17:23

Quote:

Originally Posted by Polwart

..You missed handhold whilst peeing over the side - from your list.

The most important of all.

benc · 24 August 2006, 22:13

Well, if you have two engines, you can lean against them and pee between them, I find that the easiest way

alt · 25 August 2006, 03:50

Quote:

Originally Posted by benc

Well, if you have two engines, you can lean against them and pee between them, I find that the easiest way

It'd be cheaper to install a proper toilet at the bow tbh

BogMonster · 25 August 2006, 04:30

Quote:

Originally Posted by alt

It'd be cheaper to install a proper toilet at the bow tbh

Just pee where you are - you've got a bilge pump, haven't you?

benc · 25 August 2006, 08:10

Well, whatever you do - if you have high tubes like I have, don't try peeing over the side - a little bit of chop, and you end up peeing over the tube, which runs down over your shoes!

wavecrosschris · 25 August 2006, 11:28

I had this made out of 3 inch marine s/s - cost just under 700quid and is suprisingly light. Made by C&B Marine in chichester in under a week without ever seeing the boat - I just supplied basic dimensions/drawing and they did the rest. C&B: 01243 511273

Richard B · 25 August 2006, 11:35

That looks very nicely finished... in contrast to the Humber A-frames which look awful - their "brushed" finish looks like they couldn't be bothered to finish and polish the stainless properly like most others do!

Tideway · 25 August 2006, 23:24

If possible, try and get some cleats on the frame. RIBs are pretty low on attachment points and it looks far better to have the ropes properly tied off, rather than just looped/tied around an expensive frame...

IMHO

Tim M · 25 August 2006, 23:31

I have just aquired a double ribcraft a frame and its really frimsly. By contast, my double osprey one is seriosly strong;I towed a rib in a few weeks ago and it didnt flex at all. No way I could do that on the ribcraft one.

benc · 26 August 2006, 07:53

They're not made for towing thought!

Well not normally anyway... you should always tie to deck fitting/towing eye on the back of the boat - they are normally secured a lot better!

Hightower · 26 August 2006, 10:19

More of a manufacturing question, but I've made a few things for my RIB out of SS but always dread polishing out the weld temper marks. Is there an easy way to do this, do the professional welders use some sort of acid treatment to get a good finish?

jwalker · 26 August 2006, 10:41

Quote:

Originally Posted by Hightower

...Is there an easy way to do this, do the professional welders use some sort of acid treatment to get a good finish?

Yep, just that. My stuff is nitric acid which is held in a paste and applied with a wee brush.

If I don't come back with the name today, give me a reminder.