STRESS FLOORBOARD - Derby Tech - November, 1987

by Bruce Finwall

INTRODUCTION: If you use the stress floorboard, you will find that it will be very ridged and resilient. This floorboard has been successfully used in the past. While there is no one best way to build it, the following description is one way. You my be able to find a better way, or you may want to redesign parts of it to fit your needs.


Step #1: Shape your floorboard

I like to build my entire car body with sticks and then "lay" my floorboard into the body. You should shape your floorboard so that it fits into the body, but make sure that you put the floorboard low enough into the body so that you don't have a ground clearance problem. When sticking my car body I prefer to use outside formers (that's why my car body plans are the actual size of the outside of the car). If you build your formers right, you can level your formers and then level your floorboard in the formers. This way the whole thing will come out level.

Step #2: Prebow board

Now place a weight in the middle of the board so that the board bows about 1" like so:

Working from the REAR TO THE FRONT drill holes as you go (you may pre-drill the plate holes only).

Attach the plate to the board. When you have all of the bolts in place it should look something like this:

It is a good idea to predrill all of the holes in the plate before attaching the plate to the floorboard. When you remove the lead weight, the board will still be bowed.

Step #3: Attach fasteners

Turn the board over so that you are working on the bottom. Attach the fasteners to the front and rear like so:

Step #4: Attach piano wire

Run the piano wire through the fasteners like so:

Pull the wire as tight as you can and hook it up to the fully loosened turnbuckle like so:

Note: Make sure that you have drilled almost every hole in the floorboard before attaching piano wire. Be careful to never drill near or through the wire!

Step #5; Straighten floorboard

Tighten the turnbuckle until the floorboard is no longer bowed. safety wire and epoxy (Loc-Tite) the turnbuckle.

The floorboard is now ready to be used.

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