In article ,
Don Hammer wrote:

So you land at TEB with your Gulfstream. Since they have a door lock
only, the FBO installs a Denver Boot-type device on the nose wheels.

Typical government crap. Anyone intent on stealing a jet can surely
stop by the local Depot and pick up some bolt cutters.

Some years ago, thinking about the problem of bike theft on our
university campus (generally local teenagers with small bolt cutters, or
outsiders coming in with a U-Haul truck), I "invented" the fiber optic
lock: small rugged sealed metal box with a keypad, a few ICs inside, and
an attached fiber optic pigtail of any desired length coming out whose
other end plugs into a receptacle on the same box.

Gives essentially zero physical protection; but once the fiber is
wrapped around something and plugged back in and the gadget is armed by
keying in a lock code, it starts sending optical pulses around the loop,
thru the fiber, and disconnecting or cutting the fiber without keying in
an unlock code will either (depending on how the gadget is designed and
set up):

* Set off audible alarm inside the (in this case somewhat larger)
lock gadget itself.

* Wirelessly trigger either an audible alarm somewhere close by
(e.g., under a hangar roof) or a silent but flashing warning light
visible to others (e.g, on the hangar roof)

* Wirelessly signal a detection unit in a nearby location (bike owners
campus office, airport tower, nearby police station)

The electronics would always have been trivial to implement for an
undergrad IC circuit designer; the needed fiber optics components are
now at the Radio Shack level; and the remote signalling would be
trivial with Wi-Fi or Bluetooth technology. The point to alarm
signalling rather than physical protection is to, depending on your
choice, scare off the bad guys, and/or know its happening immediately,
and/or alert someone who might catch 'em. The reasons for a fiber optic
rather than electrical wrap-around cable/signal loop are (a) these days,
very cheap and very low power consumption; (b) impossible to tell from
looking or "sniffing" if fiber is actually armed and carrying a signal;
(c) impossible for even a sophisticated thief to "scrape off the
insulation" and bypass the signals in the fiber cable loop.

Hmmm -- maybe I should be going into business.