Top-bar beehive design

Here’s a Google Sketchup design for a simple top-bar beehive.

Some pics:


Notes:

Only 2 measurements really matter in the design of a top-bar beehive: the angle of the side panels (70 degrees) & the width of the top bars 35mm. They both pertain to bee behavior and this design has them both optimized. From what I gather, other measures are quite forgiving.

This design is simple & well researched, I do not know yet how it will fare in practice, more to come on that.

Material:

All you’ll need as far as wood is concerned is a couple of 2x12x16 and a 3/4″ sheet of plywood:

Lastly, all units are in millimeters but based on standard lumber sizes available at the hardware store.