Tales from the Test Floor: Air Cannon Makes a Perfect Shot

Researchers at the Forest Products Laboratory (FPL) are back to work using the debris launcher in the Engineering Mechanics and Remote Sensing Laboratory.

The debris launcher is an air cannon that fires two-by-fours at 100 mph to replicate what could happen in a house or any wood structure during a tornado. The equipment has been used frequently over the past several years, most recently to test the viability of tornado safe rooms constructed of wood.

This time, researchers are using the cannon for a new purpose: shooting the lumber ‘missiles’ at sections of cross laminated timber to test the engineered material’s performance withstanding projectiles in high-wind events, and there was a surprise ending to the test.

The missile was fired at the test wall, and it bounced off the wall…right back into the cannon! Take that, cannon!Missle  after testSeems like a one-in-a-million shot. But wood, er, would you believe it happened twice?! Goes to show that even after more than a century of research at FPL, good ol’ wood still has a few tricks up its bark, er, sleeve.