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This is a general view of the 500ml sustainer. Body dia is 20mm. The fin acts as a sprink to help force it of the booster. I need to take the rocket up to 130psi plus to launch this as the crushing sleeve tends not to let go properly at lower pressures. I still have more work to do on this. Recovery is by back sliding.
Detail of the fin and nozzle. If you look closely at the nozzle you will see were then name comes from.
The nozzle is made using a very stiff plastic cocktail straw. It fits exactly into the white cap off a sports top. The inside of the cap is filled with precision epoxy to hold the nozzle and allow for exact alignment. The epoxy takes over 6 hours to set so you have plenty of time to get it exactly square. The nozzle assembly is then glued into the pipe.
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