BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com

Berkeley Nucleonics Academy RF Boot Camp - RF Cafe

The Bottom Line Trumps Security
Kirt's Cogitations™ #97

RF Cafe University "Factoids," "Kirt's Cogitations," and "Tech Topics Smorgasbord" are all manifestations of my rantings on various subjects relevant (usually) to the overall RF Cafe theme. All may be accessed on these pages:

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36

< Previous Next >

The Bottom Line Trumps Security

A key technology necessary to create acoustically silent submarines is the production of the precisely machined massive propellers that provide the motive force. Cavitation, a phenomenon that generates air bubbles in regions around the propeller where the local pressure is lower than the vaporization pressure of water, generates noises that sound like fingers snapping, and is a major betraying sonar signature of submarine models. Cruising at great depths where pressure is higher helps mask the effect, but the time submarines are most vulnerable are when nearer to the surface. The good news it that finite element computer modeling has produced shapes capable of eliminating the cavitation, but extremely precise machinery is required to craft the 20-foot-plus diameter, 40-ton-plus behemoths. Such technology would provide significant advantage to the Navy. The bad news is that a few years back Toshiba, who was contracted by the Navy to build the milling machines to do the job, illegally sold the technology to Russia, thereby undermining the effort.

Innovative Power Products Passive RF Products - RF Cafe

The Bottom Line Trumps SecurityKirt's Cogitations™ #97

The Bottom Line Trumps Security
Kirt's Cogitations™ #97