He donated to a home for the blind. Davidson remained active with Harley-Davidson until his untimely death in 1950 when, in a sad twist of fate, Davidson, Davidson's son James, and his wife died in an automobile accident in 1966. Obsessed with Improving his invention, Harley began work on designing a two-cylinder engine. After a false start in 1907, he perfected the model in 1909. The new engine, called the V-Twin, could propel a motorcycle to a blistering speed of 60 mph. Thanks to the success of the V-twin, the company quickly developed a reputation as a manufacturer of reliable and fast motorcycles, and by 1910 annual production rose to 3,200 machines. Although Pershing never caught up with Villa, the motorcycle proved its worth in combat and when America entered World War I, Harley-Davidson was drafted into service. By 1917, Harley supplied about half of its motorcycles to the military. But by the end of the war, all of Harley-Davidson's production was for the military, more than 20,000 motorcycles in total. Many chains sell brands of motorcycles, clothing and much more. Harley Davidson has many stores in