Detail work on the 4" aluminium/glass fibre/carbon fibre N-motor rocket, at the Federal Institute of Technology in Zurich, Switzerland, in September of 2000. Following the application of black and red paint to the rocket at an automotive paint shop, we began assembling the electronics compartment. The main mounting base for the electronics consisted of an aluminium centering ring and shoulder, screwed to the modified and threaded forward closure of the aluminium N2000 motor case. This construction also served at the mounting point for the glass upper airframe section.
The second photo from the top shows Professor Eugene Trubowitz during a test assembly of the upper airframe section to the lower half of the rocket with the still empty electronics compartment. A piece of white insulation foam can be seen on the aluminium centering ring; this was designed to shield the electronics from the head emitted by the motor.
Threaded steel rods then served to hold four custom-made aluminium mounting bridges, to which we attached the two BlackSky AltAcc dual deployment recording accelerometers. The AltAccs were intended to trigger the release of the Rocketman main und drogue parachutes.
Moreover, the threaded steel rods also provided the mounting points for the sealable aluminium top bulkhead/shoulder, which, in turn, held the two pyrotechnic release modules and the aluminium recovery system strap retainer bars. The entire assembly was beautiful and tidy, but, in hindsight, perhaps a bit too delicate for the loads it would encounter.
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