What would be the efficiency of the pusher prop in that bizarre machine? It looks like the air it's working in would be very dirty indeed.
Edited to add: I've just realised that it's channelling the Pou-du-Ciel, though they say the modern stuff is much stronger than when I last inhaled.
Last edited by FlightlessParrot; 13th Aug 2020 at 02:12.
Reason: Second thoughts