SE Jib Boom
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Last update, January 8, 2010

 

Jib Boom Rigging

 

 

Supplier Internet Information

 

SailSetc parts (SE) and

all from Midwest Model Yachting (MMY)

Part photos can be seen there.

Parts:

Combine this list with main boom parts

1 - Main boom kit 625 mm with fittings, MMY #100M

      Comes with #160 attachment kit. Parts needed in this kit

      listed here individually for stocking reasons.

1 - Jib boom forward fitting, MMY #99

1 -  Jib boom aft fitting, MMY #98

2 - Sheet attach point, MMY #80L (one is in boom kit)

4 - Track slide and sheet hook, MMY #82S (one is in boom kit)

     Track slides come with cap screw length deeper for what they do.

Rigging wire for hooks, MMY #214, should have this from the

     main boom, stock

Track slide for clew hook, (boom kit)

1 - jib counter balance, MMY #106-35

 

Supplies:

Screw assortment

Rigging wire for hooks, listed above

 

Tools:

Drill and drill bits

5/64" ball hex tool

Metal file or sander

 

The jib  boom is a busy place. There are a lot of controls and not much room for some conveniences. This boom is new to Delta and here is what we will use:

        Forestay mount to the boom

        Downhaul

        Mast rake

        Jib Swivel adjustable Guide

        Jib swivel mount and connection to the rack

        Sheetline adjuster

        Topping lift adjuster

        Sheetline adjustable guide

        Outhaul adjuster at the clew

        End fitting and topping lift guide

We will try to keep the boom length short of the bow! That is a limiting specification.

 

Boom Construction

There is nothing new here after going through the main boom process...just more of it. Cut the boom to 490 mm and clean it up. The subject items will be from the forward end of the boom to the aft. The forward and aft inserts will be installed last.

 

 

Forward Insert Mount

Install this last for convenience. This part will anchor the jibstay wire, hold the counter balance and provide a return for the jib downhaul to the adjuster. The top has a pre-drill hole for a pin or screw. A pin is best and a shaft for a 2-56 threaded rod worked here. The holes were drilled so that the pin needed to be forced on. It was trimmed and is going nowhere. The counter balance will in installed in pre-tuning. When this is installed pre-drill a hole for a #2 sheet metal screw under the boom and into the fitting shaft to secure it.

 

Jib Swivel Guide

Slide the "Sheet" attach point track on the boom with the guide aft as shown. We will attach this to the deck later in the rigging. This guide is generally fixed once the sail plan has been through pre-tuning and some experience in the water. The adjuster is to allow convenience in finding of the right spot for balance and position.

 

Downhaul Adjuster

Slide on a track sheet hook pointed forward behind the swivel guide. We will connect this to the tack grommet on the jib during the rigging. Tension stiffens the luff, to some extent the leech and creates more stiffness to the camber of the sail relative to the outhaul setting. Very little movement of this adjuster is needed.

 

Jib Swivel Adjuster

Slide on a track sheet hook pointed forward behind the downhaul adjuster. This will be connected in the rigging through the guide to a hook on the jib rack. This is rarely used but will change the level of the jib boom, the distance from the mast and make minor adjustments to mast rake. Some hard mount this connection but on the SE boom it takes a fitting to do both...so why not?

 

Sheetline Adjuster

Slide another track sheet hook point aft. This too will be connected in the rigging.

 

Topping Lift Adjuster

Slide another track sheet hook point aft. This too will be connected in the rigging.

 

Outhaul Clew Adjuster

Slide on a track sheet hook part without the hook (the screw is slightly longer). We will make a clew hook when the jib is installed and the height needed is determined.

 

Aft Insert Mount

Its main purpose is to provide a guide for the topping lift line. When this is installed pre-drill a hole for a #2 sheet metal screw under the boom and into the fitting shaft.

 

This completes this section. Move on to assembly of the rig.