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Ameture test, MiniD
Date:April 7, 2001
Weather: Mostly clear
Author: Daniel
Type: Flights
Acquired altitude: 50, inches, unknown ft

On Friday, we started our testing of 3 3/4 inch PVC rockets which had water putty nozzles and packed propellant. They had a full core. The first one lifted off and at 11 feet above the pad, shot the nozzle off, and the rocket went to another 50 or 60 feet before reaching apogee. The second one had roughly the same construction, but this time, it stayed on the pad for a second or so, then lifted off to about two inches where it hovered until burning out. The rocket was badly melted, because the deflector on the pad pushed all of the very hot smoke back at the rocket. We decided that the core probably fell apart, because the thrust lasted a little longer than usual, and the smaller burn area would cause an overall reduction of thrust. The third rocket had to wait until Saturday, because its epoxy was still drying. This one lifted off and when it was about 15 feet off the ground, there was a pop and it accelerated suddenly. Though we could find neither the nozzle nor the rocket, the pop suggested that either the nozzle or the upper bulkhead had shot off, and the acceleration eliminates the bulkhead, therefore, it was the nozzle. So in light of these failures, we have decided to put steel retention pins through the PVC (click here to view the sketch), then pour the water putty. If this does not work, what we will do is put endcaps over the end, then pour the water putty so that the endcap holds the nozzle in (Click here to view a sketch of this). retention

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