O-Ring #213 Buna-Nitrile Black 70 Duro for StratoCoupler.
Size: 15/16" ID, 1-3/16" OD, 1/8" Width
Add an expansion chamber on top of an FTC rocket:
- Slide O-ring on StratoCap to first lip.
- Slide O-ring on soda bottle to first lip.
- Screw StratoCoupler snug onto the FTC rocket.
- Screw the bottle on top as an expansion chamber.
- Do NOT exceed 120 PSI when using an expansion chamber.
- A weighted fall away nosecone made from a 2nd bottle is required.
- Back gliding recovery can work, but a parachute is recommended.
A Chute Release device works best for deploying a parachute when attaching an expansion chamber on an FTC rocket.