Hormann HLS F-71: Difference between revisions

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|hertz = 400 - 530
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The HLS F-71 is a pneumatic siren manufactured by Hormann gmbH. It was an improved design of the Pinsch Bamag and Rickmers Werft models. These sirens have a diesel engine that drove an air compressor and generator. The air compressor fills up a 6,000 liter air tank up bellow the sirens tower ,and the generator charged up the accumulators for power. Air is then piped up to the head that has a cast aluminum disc rotor with 4 slots in it powered by a 48 volt motor. These sirens actually had speed control of some sort on the chopper motor which is why they have such a linear wind up. Battery voltage would only affect how fast the chopper would ramp up. Most of them tended to be somewhere in the 400 Hz to 420 Hz area so long as the batteries are in good condition ,but some can peak as high as 530 Hz. If the voltage falls too far below 24 VDC it would have slow wind ups and peak lower than normal just like any typical DC powered siren. When that speed controller or whatever it is gives up the ghost, the chopper will spin up and run at any pitch. There are currently no active F-71s. Germany has decommissioned theirs since the 1990s or early 2000s. And Israel has decommissioned theirs in 2010. Many in Germany have had their heads removed and use their tower to support radio antennas or replaced with a Hormann ECN ,some are sitting abandoned ,and others have been removed. In Israel ,all of theirs are still standing but inactive ,and have been replaced with ATI HPSS-32s in 2010.
The HLS F-71 is a pneumatic siren that was produced by Hormann gmbH. It was the successor of the Pinch Bamag and Rickmers Werft sirens, boasting many improvements.  
The sirens contained a diesel engine that drove a generator and an air compressor. The compressor was used to fill a 6000 liter air tank underneath the tower mount for the siren, the generator charged for power. From the compressor, the air is pumped to the siren head through a tube. The head contains a cast aluminium disk rotor with four slots, which was powered by a 48 volt motor. The chopper motor had some sort of speed control mechanism on it, which allows for a linear windup. The chopper windup was also controlled by the amount of voltage in the battery.  
Most HLS sirens were between 400 and 420 Hz, but some have been known to peak at 530Hz.  
If the siren's speed controlling mechanism became nonfunctional, the chopper would be able to windup and run at pretty much any speed.  
 
Due to replacements with more modern sirens, there are no HLS F-71 sirens in service. The HLS F-71 sirens in Germany were de-commissioned between 1990 and 2000, Isreal's were turned off in 2010. Most locations in Germany have been removed with only the towers remaining, which are used to house radio antennas, or to hold their newer Hormann ECN sirens. In Isreal, none have been removed, even after their replacements with ATI HPSS-32 sirens.  
 
 


[[File:B2ADFADF-CAFB-4A68-8219-6D2EB750CCDE.jpeg|thumbnail|Base of the F-71 tower showing the engine ,generator ,and accumulator room bunker hatch ,engine exhaust pipe ,and air tank with air relief valve on the side.]]
[[File:B2ADFADF-CAFB-4A68-8219-6D2EB750CCDE.jpeg|thumbnail|Base of the F-71 tower showing the engine ,generator ,and accumulator room bunker hatch ,engine exhaust pipe ,and air tank with air relief valve on the side.]]

Revision as of 00:24, 13 June 2019

Hormann HLS F-71
A decommissioned F-71 in Germany
Company Hormann
Produced late 1960s-1970s?
Type Pneumatic
Sound output 132 dBc at 100 feet
Frequency 400 - 530 Hz

The HLS F-71 is a pneumatic siren that was produced by Hormann gmbH. It was the successor of the Pinch Bamag and Rickmers Werft sirens, boasting many improvements. The sirens contained a diesel engine that drove a generator and an air compressor. The compressor was used to fill a 6000 liter air tank underneath the tower mount for the siren, the generator charged for power. From the compressor, the air is pumped to the siren head through a tube. The head contains a cast aluminium disk rotor with four slots, which was powered by a 48 volt motor. The chopper motor had some sort of speed control mechanism on it, which allows for a linear windup. The chopper windup was also controlled by the amount of voltage in the battery. Most HLS sirens were between 400 and 420 Hz, but some have been known to peak at 530Hz. If the siren's speed controlling mechanism became nonfunctional, the chopper would be able to windup and run at pretty much any speed.

Due to replacements with more modern sirens, there are no HLS F-71 sirens in service. The HLS F-71 sirens in Germany were de-commissioned between 1990 and 2000, Isreal's were turned off in 2010. Most locations in Germany have been removed with only the towers remaining, which are used to house radio antennas, or to hold their newer Hormann ECN sirens. In Isreal, none have been removed, even after their replacements with ATI HPSS-32 sirens.


Base of the F-71 tower showing the engine ,generator ,and accumulator room bunker hatch ,engine exhaust pipe ,and air tank with air relief valve on the side.
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