After different tests carried out with different types of helicopters, as we can see below, he finally made a demonstration machine with a steam engine.

“Two Ponton tryouts”

-The little Ponton D’Amècourt machine with a steam engine was built by a watchmaker mechanic and a copy is kept at the Paris Air Museum at Le Bourget airport.

"Photograph of the original"

"Copy at the MAE in Paris"