"If we worked on the assumption that what is currently accepted as true really is true, then there would be little hope for advance."

"The machine is a success and we are well pleased with it."

"We were not discouraged by our failures, but rather stimulated to renewed effort."

"If its engine stops, it must fall with deathly violence, for it can neither glide like the aeroplane or float like the balloon. The helicopter is much easier to design than the aeroplane, but is worth…"

"No one can appreciate the work and worry it cost us to build our first machine."