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Re: cb trunk const

To: "Mark White" <Mark@xxxxxxxxxxxxxxxxxxxxxx>,<swiftsolo@xxxxxxxxxxxx>
Subject: Re: cb trunk const
From: "Roger Wright" <rowr@xxxxxxxxx>
Date: Fri, 9 Sep 2005 20:35:16 -0600
References: <049601c5b5a7$4b7bfd30$0200a8c0@markkrtsykx0qx>
Mark, everyone is building the alternate trunk, it gives you the flexibility to try different CB's as it is just a square hole which is then filled with a rectangular block on top and bottom to seat the CB.

Be VERY VERY careful to get an exactly rectangluar hole in the top and bottom of your CB trunk, this will cause you no end of grief if you have a hole which is not exactly rectangular (14" x 2" I think it is) The reason that you want this hole so perfect is that you only have a tiny bit of tolerance to play with your CB thickness. Some of the guys have ended up sanding through three layers of kevlar to make the Cb fit. For every CB you use, you need to cut a block to fit that hole and to fit the CB gap to 1/16th", so take your time with it. If you make the sides of the trunk and find that they are a little bit warped, rather take the time and re-do them.

The principle is that you are going to cut a 1.5" thick block and taper it so that all the loads are going to be transfered through the skin of the Swift and not into the CB trunk.

When fitting the CB trunk, I find the easiest way is to turn the hull upside down and to cut the hole in the hull first to the exact dimensions of the CB trunk hole. Then make up a T-shaped rectangular spacer that fits into the trunk and also into the hole in the hulll. This allows you to centre the bottom the CB trunk perfectly and you only need to worry about vertical alignment, (not longitudinal or horizontal.) This method also sets you up really well to align everything else true.

By the way, an alternative method for working with hybrid is to cut the pieces to size and then individualy cover each piece with hybrid. Just before it cures fully (after about 3-six hrs) you can take a sharp knife and cut the hybrid like butter. This is a lot more work, but gives a better edge finish and also eliminates having to sand kevlar edges to shape.

A warning to everyone out there; Kevlar is nasty stuff to sand, if it gets in your lungs, it is probably going to stay there for a very, very long time, so wear a dual action respirator that removes epoxy vapours as well as particulate. By wearing just an organic respirator, the particles are not necessarily taken out and vice versa.

Good luck


----- Original Message ----- From: "Mark White" <Mark@xxxxxxxxxxxxxxxxxxxxxx>
To: <swiftsolo@xxxxxxxxxxxx>
Sent: Friday, September 09, 2005 7:30 PM
Subject: cb trunk const



Thanks all,


I am building the alt trunk, and have the plans, just didn't know what to cover it with, and if there was a particular order to assemble. Thanks again.

Sincerely,

Mark


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