Facts related to "Biplane"
http://www.theaerodrome.com/aces/belgium/coppens.php "On one occasion, the balloon he was attacking shot upward and Coppens actually landed his cobalt blue Hanriot HD.1 on top of it. Switching off his engine to protect the propeller, he waited until his aircraft slid off the top of the balloon, then restarted the engine and watched as the German balloon burst into flames and sank to the ground."
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