Test flight number 44 and we experience a safety link failure on launch. During this test flight we were flying the aircraft in gusty wind conditions consistently gusting above 17 mph. The 4 launches that we conducted this day were fairly aggressive with rates of climb up to 1500 ft./m. At the end of the flight with the aircraft still on the ground you can see the wind gusting and indicating 17 mph on the airspeed indicator. The airspeed indicator does not register until 15 mph.