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space derby
The space derby is a racing event for Cub Scouts in the Boy Scouts of America that is similar to the pinewood derby car race. Cub Scouts (the young-age division of the Boy Scouts of America) race miniature balsa wood rockets that are propelled by a rubber band and propeller.
==Construction==
The space derby kit consists of a balsa wood block, propeller assembly, rubber bands, plastic sheet (for fins), and a mounting bracket. The wood block comes out of the box with a drilled out center hole. The block is carved into the desired shape, sanded and painted. The mounting bracket and fins can be added either before or after painting. The rubber band is inserted through the center hole with one end on the propeller and the other held in a cross-piece at the rear.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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