Bo has it pointed out:
Early aircraft engines had brass valves on the cylinder head, which are in direct connection to the combustion chamber. During the start-up procedure to be opened in order to spin the engine without compression with the propeller more easily, which causes the typical hiss ("Zischen", in German language). Then some Benzin is instilled into the funnel-shaped pans at the taps, the propeller is again rotated through and then the valves are closed. The Benzin in the combustion chamber makes it easier to start, now.
The correct German-word is "
Zischhahn".
This is a single-word.
The majority is "
Zischhähne".
@Lucasz:
Outstanding work, realy outstanding work!!
I will order a minimum of 4 Set's immediately, when these "Zischhähne" are on the market.
Servus
Bertl