Strap-On Booster Hardware Suite (BT-70 and BT-50)

thingiverse

This is a suite of five pieces of hardware that can be printed to enable rocketeers to add strap-on boosters to their rockets for parallel staging, mimicking the approach used by professional rockets such as the European Ariane 5, the US Space Shuttle, the Japanese H2, H2A, and H2B, and the Russian Soyuz. The models are designed for Estes BT-70 (sustainer) and BT-50 (booster) airframe tubing. They are small and detailed enough that printing them on a resin printer is recommended, but scaling up for larger rockets can also be done with a filament printer. The following pieces are included: 1. Offset nose cone modeled after the Ariane 5 nose cone SRBs (not to scale) 2. Symmetrical nose cone modeled after the Delta II and III GEM SRBs (not to scale) 3. Nose cone end cap with a 3mm hole for a screw eye 4. Sustainer upper mount 5. Sustainer base mount, version 1 or 2 6. Booster base mount, version 1 or 2 7. Simulated Delta II and III GEM SRB nozzles for static display. The parallel-staged boosters should use Estes booster motors with a delay of zero - A8-0, B6-0, C6-0 as examples. When the parallel stages are attached to the sustainer, the slot created for the sustainer mount should allow the nose cone to slide over it inside. As the booster motors burn, they will eject the nose cone and recovery system while it falls away from the sustainer. Note 1: The triangles on the upper and lower sustainer mounts as well as the low booster mount are there to help align them accurately on the airframe tubes. Note 2: Not shown in any of the photos, a piece of balsa or basswood should be glued to the area on the booster stage that sits right behind and next to the upper sustainer mount to keep the booster from moving forward. Videos of parallel staging can be found at: https://www.youtube.com/watch?v=0FEUffhvFuc https://www.youtube.com/watch?v=N5p-stllS1g https://www.youtube.com/watch?v=9Iphs9uDQbc