With plexiglass the scoreing followed by impact will be mostly useless unless the plexiglass is quite thin or you "score" through most of it (which will be much more like cutting). This method would work admirably with glass. <br><br>An option might be a battery powered dremel tool pre-loaded with the correct cutting wheel. It is small and could be taped / velcro'd to the canopy / dash and be perfectly capable of cutting through most plexiglass. <br><br>I am unfamiliar with the aircraft specifics but if you craft is upside down on a plexiglas bubble and you break the bubble is there sufficient room within the cabin for you after the aircraft settles down on the broken shards of the canopy? Seems like a bad situation whatever.