Thanks. The earlier patent 4429656 actually provides for a two tone version. http://www.delphion.com/cgi-bin/viewpat.cmd/US04429656__?OUT_FORMAT=pdf&MODE=fstv A two tone (or more) version of my latter patent 4686928 would look somewhat like a gargantuan chime horn. http://www.delphion.com/cgi-bi...
It's really a whistle, as it uses a resonant air column rather than chopped air as in a siren. It's not of your usual cylindrical design, but a toroidal design, which acts as a large virtual phased array of about 30 steam whistles! This in turn drives a horn for more directivity and 10 dB greater ou...
If this is in reference to the polar pattern of US Patent 4429656, it is simply the polar pattern of a 5/8 wavelength ring radiator, which this virtual large phased array (toroidal) whistle essentially is. I call it the Ultrawhistle, since it is equivalent to 28 conventional cylindrical whistles in ...
The operating pressure is a mere 15 PSIG! You can find all of the information you need to build one at my research website at http://rjweisen.50megs.com I also moderate the group http://groups.yahoo.com/group/steam-whistles There are interactive Excel design spreadsheets that are available in our fi...
Have you ever wondered why certain old factory whistles were audible at distances of 10 miles or greater while one is lucky to hear an initially much louder DES warning siren at distances greater than 5 miles? It's no myth that you can really hear those old factory whistles from such distances. What...
jkvernon wrote:This isn't a competition. I don't blame this guy for arguing for his whistle. It is a good idea with tons of planning and work put into it.
http://www.courier-journal.com/apps/pbcs.dll/article?AID=2008802080397 Here is the recent article. Byron Crawford has been following my developments since his first story about my Ultrawhistle prototype in the 1980s. There is even an article about it in his book, "Crawford's Journal". Ther...
To power a large whistle, such as a 20" toroidal, it would be much more efficient to use a Roots blower, single stage rotary screw compressor or centrifugal compressor to supply the required 1350 to 1800 SCFM at 15 PSIG. This blower or compressor could be driven by an electric motor with lithiu...
The device shown in the video was incorrectly labeled as my Dynawhistle. Actually it is the original prototype test of my earlier device, the Ultrawhistle. The video can be seen in its entirety at http://www.youtube.com/acoustics101 This small 20" device produced 70 dB on a radial at 2.5 miles ...