The "Evergreen"

Quotes:
"Between October 17-31, 1911, in the Evergreen Valley, just south of San Jose, Montgomery made more than 50 glides with his new aircraft, each approximately 240 m (785 ft). On October 31, flying at an altitude of less than 6 m (20 ft), the Evergreen stalled, sideslipped, came down on the right wingtip, and turn over. Montgomery hit his head on an exposed bolt and died from his injury two hours later."

-National Air and Aerospace Museum

Description:
The Evergreen was the most heavily-tested of John's creations. It worked to a great degree of efficiency. It was his lifes work, but also the cause of his tragic end. When flying at a low altitude, his plane flipped and he hit his head, resulting in a fatal injury that claimed his life only two hours later.

Related:

 * John Joeseph Montgomery
 * Tandem-Wing Glider