Conversation so far:
what was snake river canyon for Evel Knievel?
Knievel hired subcontractor and aeronautical engineer Doug Malewicki to build him a rocket-powered cycle to jump across the Snake River, and called it the Skycycle X-1.

Question: what was the launch of?
Self-contained rewrite: What was the Evel Knievel's snake river canyon jump a launch of?