These choppers give the MR-73 an initial rate of acceleration of 1.43 m/s2 5.2 km/h/s.

The notes of the propulsion are the same as the first three notes of Aaron Copland's "Fanfare for the Common Man", one of the musical themes for Expo 67, but that is apparently just a coincidence. The notes were so remarkable, that in 2010 these notes were chosen as the door closing sound for the Montréal Metro and as brand sound