July 2022 Mk I Viper Flight Test

The first two flight test with the new throat diameter of 6.7 mm did not go well! In the first test, the Mk I Viper made it to the top of the rail guide, blew out the nozzle, lost thrust, broke through the stop, came off the rail guide, and crashed onto the concrete pad. In the second test, the Mk I Viper left the rail guide at ~ 1.5 m/sec, began to pitch up, blew out the nozzle, flipped over once, and crash landed next to the test stand.