Intro to Recovery Nov 17
What is a successful recovery?
- all parts of the rocket are collected
- gps tracking, rocket doesnt split apart from shock loading
- reflyable conditions
- safe descent velocities
How to have a successful recovery
- mechanical and electronic validations
- many components are mechanically tested
- all electronics chanrges are wired properly
- vehicle has been ground tested and electrionics are able to set off charges
- separates enough to let parachute out.
Recovery components
- drogue parachute
- main parachute
- shock cord
- bulkhead
- parachute bag
- u bolt
Drouge parachute should be close to center of mass
common types of parachute
- Torodial, pulled down parachute
- ringsail
- flat parachute
- disk gap band
What is shock load?
- instantaneous force of parachute opening and catching more air
How do we choose our parachutes?
- want to balance our descent velocity and shock lead.
- descent veolity usually <30ft/s for compentitnions
- shock load: all parts of system must be rated enough to withstand (w/ FOS)
Avionics bays
- the part itself is called a "sled"
- two altimeters, all on a removable bulkhead
How are tubes separated?
- most commonly: we pressurize the tube to break the shear pins holding yhe stuff together
- the motor eject ignites a delay grain which ignites blackpoweder in yellow cap of motor.
- release COT to pressurize the tube.
Parachute retention
- Jolly Logic
- rubber band holds the parachute
- tender descender
- holds the stress of the rocket, when the descender releases, very hard to get quite right
- Line cutters
- if the parachute is ziptied closed, the ziptie is cut by the piston after blackpowder detonation.