Whoosh rocket bottle nozzles

This is set of nozzles for whoosh bootle rocket.

NASA recommends to use 3\8" hole for 2-liter bottle using Propan-1-ol. It seels underpowered. I tested on 1,5 liter bottle 5mm nozzle - works fine and produces shock diamonds with isopropyl alcohol.

Most likely you need to use 98-95% scale for tight fit of bottle neck, or use additional sealing.

Laval and aerospike nozzles is OK, but you may need a fine tune for your fuel and bottle. It's highly advice not to decrease critical diameter of this nozzles, less than you get shock diamonds without any profiled nozzle (only hole). Aerospike critical diameter square is poor - seems it's too big. To handle it, seal reverse side of cap with stub with 5mm hole (or greater). This model is also included.

Additionally if you plan to measure thrust of your whoosh rocket, you may use bottle clip holder for HX711 scale.

Be good. Be smart. Use accident prevention.

Detailed video of testing these nozzles here: https://www.youtube.com/wa