Differs from the average book of its type in dealing with things that ""go"" primarily, -- model airplanes, bicycles, all kinds of boats, model racers, kites, outdoor tractors, trailers, outdoor gymnasium equipment, soap box racers, rigged surf boards, etc. Where contests are involved, specifications for entry, etc. are given. A book for boys who turn their energies to active sports, and who can't afford elaborate equipment.