In article . net,
Michelle P wrote:

wrote:
Anyone have a recommendation/source for an escape hammer to bust out
the canopy of a Tiger in case of a forced landing and jammed canopy?

The escape hammers work well on glass but not plexaglass. You will need
an axe to get through the plexi.

Check with Ben Davisson (sic).
Back in the mid-1980's, someone published plans for a canopy breaking
tool. I thought Ben made some and was selling them.
It started out as a big rectangular piece of steel.
One half was shaped into a triangular dagger.
The other half was formed into a cylindrical handle with a guard between
the handle and the blade to prevent ones hand from slipping forward.