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I understand the original Fleas had a dangerous mode (I think if dived too fast) which could not be controlled by the wire foreplane pitch control which is why the modern ones have push rod foreplane pitch controls.
I have a copy of the original Henri Mignet book
"The Flying Flea"
how to build and fly it
translated by the Air League of the British Empire
It is dedicated
To those who dream of having wings...
To the memory of those who have loved them so greatly.
It has this rather touching epilogue with an excellent third paragraph and an epic final sentence.