A while ago we were hunting for the moving 1 on the 1 version that Sbarro van Robbedoes and Kwabbernoots 'Turbot'. We still do not know where that uniqueness has gone.
But in the meantime we know where the artist Franquin got his inspiration from.
The Turbot is a direct descendant of the Socema-Gregoire Turbine from 1952 and there is one - or: it stands - in the car museum de la Sarthe. In France. It remained with a single copy. Costs soared and the brakes couldn't get things under control.
But the car lives on because of the Franquin comics