The Siren Board

Apparently, these are air driven units, but very loud:

http://www.youtube.com/watch?v=3pL8Ic4L ... ed&search=

http://www.youtube.com/watch?v=KqwQVgDR ... ed&search=

http://www.youtube.com/watch?v=nqXu3GBJ ... ed&search=

http://www.youtube.com/watch?v=te72h7Nj ... ed&search=

The HLS are truly amazing.

The HLS have a brass chopper of about three inches in diameter. It is no surprise that pneumatic sirens work very well with small choppers, or ports, for that matter, because when you have air piling up in a big chopper, and expelled through big ports, allot of time and energy would be wasted in getting the pressure of the air flowing through the chopper just right.

My god, is that '273 shaking in the wind?!

The thing that I like about the HLS sirens is that they, or at least the HLS 273, have two stators, one inside the chopper for possibly as little displacement of air as possible, and a sound-function stator on the outside, with passage ways curving down, where they meet with the horns.

Here is a great thread showing the parts: http://48645.rapidforum.com/area=11&order=u&startid=2, called "Restauration HLS 273."

They are remarkably efficient for pneumatic sirens. The engine which drives the compressor is only fifteen horsepower.

Deutz is pretty impressive. Deutz even built engines for some examples of GE's AC600CW locomotives, I think.

What I like about the transmission system for the HLS' compressor is the fact that there is a clutch for disengagement of compressor power with the compressor for that famous, "with a cold" wail.

Did the Rickmers Werft sirens have a disc rotor? I know the HLS 273 and 373s have a small cylinder rotor.

possibly. #Bump

Duderocks5539 wrote: ↑

Wed Nov 29, 2017 7:41 pm

Did the Rickmers Werft sirens have a disc rotor? I know the HLS 273 and 373s have a small cylinder rotor.

Yes. Actually all of the larger pneumatic sirens use disk based choppers.

Rotor from a Pintsch Bamag.

DJ2226 wrote: ↑

Thu Nov 30, 2017 4:18 am

Rotor from a Pintsch Bamag.

It has the same keyed shaft fitting on the rotor as my model 120.

Ive heard someone say the Rickmers Werft's were custom made ,is that true?