Icing Research Tunnel (IRT) GalleryThe powerful fan and motor at the heart of the Icing Research Tunnel is capable of producing continuous airspeeds up...PFM powered force model rotor. This image shows one possible type of ice accretion that the Icing Tunnel can produce.Bell 609 spinner inlet icing model. Technicians taking measurement of ice accretions after an icing test.Technicians pose with the ERJ-170 airfoil set up for testing the IRT.