My next boomilever. I added more bracing, and used 1/8 inch by 1/8 inch balsa wood (thicker than used on #1). Yet to be tested, I will update with results.
UPDATE: The boomilever weighs 6 grams, and held 2.5 kilograms, giving it an efficiency score of about 410. It broke where the balsa comes out of the base, it snapped that length of balsa in half. I will sandwich that area with another piece of wood to make it stronger.