Cuckoo fan

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Cuckoo type fan on an older DB AG passenger car (redesigned n-car)

Cuckoo fan on a Czech Railways passenger car

Static fan type 'cuckoo'
1-baffle
2-air
guide plates 3-suction hood
4- airstream
5-exhaust air from the car

Cuckoo fan is the slang term for a static fan of the cuckoo type , which is still often used on the roofs of railroad cars .

The cuckoo fan was developed by the aerodynamics technician Heinrich Kuckuck , who had been a co-owner of Colt Ventilation Ltd since 1931 . Due to the design of the housing of the fan, a negative pressure is created by the airflow passing the fan , which sucks the air out of the interior of the vehicle. The baffles were z. B. in the execution of the DR and the Czech railways vertical, in which the DB is curved.

Since the amount extracted is limited depending on the driving speed and due to the principle involved, many cars were instead equipped with other forced ventilation devices. Because of this, and also because air-conditioned passenger coaches are being used more and more frequently by European railway administrations, static fans have not been so common since the 1980s.