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Rational "Crown Board" or "Coverboard
Not really required...But for completeness sake

3rd Angle
The Grain should run along the longest dimension of any part.

Cutting of parts (all dimensions in mm).
QtyLengthWidth ThicknessMaterialUseage
1460460 9Exterior PlywoodMain Panel
2460 199PineLong sides of rim
2422 199PineOther rim parts
Rational Crown Board
This item is identical in size and construction to the "National Crown Board"

Use with rim downwards for bottom bee space or with the rim uppermost if top bee space is required.

The holes shown are to suite the standard porter escape.

Porter Escape Holes gives methods of cutting such holes. For normal use a single 33 mm central hole proves to be adequate.

Note 1.
9 mm plywood is specified owing to it's greater rigidity and freedom from warping. This durability outweighs the small cost saving of using thinner material.


Note 2.
9 mm is specified for the thickness of the rim material but commercial supplies are often of 8 mm thickness, using 8 mm is unlikely to cause any problems.

Assemble using a waterproof PVA type glue and 16 mm pins or staples.

If you wish to use this item in a system that uses bottom bee space, then add the Rim Parts.

The version as drawn above is both simple and durable. If petroleum jelly is used on the rim and linseed oil is used on the main panel the item will give many years of good service.

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