F42-4T

ARC Competition

You went out of your way to fulfill our order for motors for our ARC team. Unfortunately, we found out that during our last two qualifying flights the F42-4T motors which had been very consistent had shortened time delays and the total impulse was noticeably lower than the other 16 motors we used during trials. The three prior flights were within 4 feet of our target altitude and our first qualifying flight was exactly 790. The newer motors had time delays almost .5 seconds shorter and the impulse was about 10 percent less, resulting in altitudes of 719 feet. Needless to say we were disappointed. Our last 5 prequalifying flights added together was less than 30 points.