Do You Swivel, Tie or Clamp?

Jan 28, 2020

There are a number of options for your pivot point on your IOM jib boom, but do you swivel, tie or clamp?

\images\20200128_jib tieIt took a while to convert, but for years now I’ve chosen to tie a piece of string (75kg dyneema to be exact) at the pivot point on my jib boom with the goal to have the jib boom as low as possible. In addition the flexibility of the line can provide advantages with the jib boom swinging more freely in light conditions. This works just fine and over the years I’ve finally mastered attaching this to the boom tying it in various different ways (probably not to the expectations of some but it’s on there and that’s what counts?).

Some sailors find this quite challenging, don’t worry, watching numerous videos of different ways to achieve this didn’t change the outcome of often getting the line attached to the boom, gluing knots and then finding that the boom still didn’t sit low enough resulting in endless hours being invested to get it right.

After finally getting the line on and set at the right length, you need to be sure that you replace the line regularly as breaking a line during a regatta can prove costly and it wont be a quick fix getting it right. Aaagghhh it sounds like more hard work!

\images\20200128_jibboomswivelFrom complexity to simplicity, there is the swivel option. In less than 10 minutes you should have this positioned on the boom and ready to hit the water. This is one of the easiest of options and is what I use on my C rig (primarily because I’m concerned with the load on the line and associated wear you get through the deck eyes and the risk of breakage). I guess that if it’s blowing dogs off chains a slight loss in height above the deck can be offset by the comfort of improved reliability.

The problem with both the line and swivel is that on round booms you cant easily adjust the position forward/aft. In general these don’t change much anyway but why cant I just have the best of both worlds?

\images\20200128_clamp2That’s where the boom clamp comes in. Using an 11mm clamp with a ‘wasted screw’ (this is the screw tightening the clamp which has a smooth spot in the middle where a line can move over without wear), a bowsie, a hook and 75kg line I can have the best of both worlds. Adjustable forward/aft on the boom and up/down above the deck this is proving to be a great option and replacing a broken line can be completed in a couple of minutes (even carry a spare line for quick replacement).

The clamp provides the benefit of the string line attachment as well as being completed at half the cost of the jib boom swivel. There is no doubt that the tie option is clean and avoids fittings that may catch other boats or lines but sometimes simplicity outweighs complexity.

It’s your choice but there are options, so do you swivel, tie or clamp?


Provided by: Sean Wallis

Category: Australia
Posted by: ARYA Publicity