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Concentrate on disabling the engine starting system and/or the fuel delivery
system.  Start with the starting system, and put some secondary switch in
series with whatever circuit closes your starter relay (or put another relay
and controlling circuitry in series with your existing starter relay).  If
this isn't enough, you can do some things to disable the ingition systems and
fuel pumps, if your plane uses them.  Just make sure that anything that
interrupts the fuel or ignition systems gets (electrically) removed from the
system once your engine starts, to keep a failure in your theft prevention
system from causing an unplanned change to your flight plan.

Personally, I like the prop lock idea myself.  Another simple device is the
brake system locks sold in performance car catalogs.  It works kind of like a
parking brake, where you apply brake pressure and then lock the switch.  They
use barrel lock cylinders, so they're harder to pick than standard locks.
Although you'd need 2 of them to totally disable your plane, I would think
that 1 would prevent your plane from going very far, if distance around in a
circle doesn't count.


Gary