Recovery System¶

Dual Deployment Overview¶

flowchart TD
    A[Launch] --> B[Motor Burnout]
    B --> C[Coast to Apogee]
    C --> D[Altimeter Fires Drogue Charge]
    D --> E[Drogue Deploys - Fast Descent]
    E --> F[Reach Main Deploy Altitude]
    F --> G[Altimeter Fires Main Charge]
    G --> H[Main Deploys - Slow Descent]
    H --> I[Landing]

Recovery Components¶

Component	Size	Location
Drogue Parachute	18" (45 cm)	Forward bay (nose to e-bay)
Main Parachute	48" (122 cm)	Aft bay (e-bay to fins)
Chute Protectors	12" Nomex x2	One per bay
Shock Cord (drogue)	Long, orange tubular nylon	Forward
Shock Cord (main)	Short, orange tubular nylon	Aft

Shock Cord Assignment¶

Cord Lengths

Per Apogee instructions:

Shorter cord goes in forward/drogue section
Longer cord goes with motor mount (discovered by reading full instructions)

Chute Protector Attachment¶

Attach close to tube exits
Allow enough slack for chute to fully clear
Some builders add one protector-width spacing

Parachute Attachment¶

Use quick links for easy field changes:

Nose Cone Loop ─── Quick Link ─── Shock Cord ─── Quick Link ─── Drogue Chute
                                      │
                                E-Bay Eyebolt

Single Deploy Configuration¶

For L1 certification (recommended):

Place main parachute in aft bay
Use motor ejection charge
Secure nose cone to upper tube (tape or plastic rivets)
Leave drogue removed or use as backup

Shear Pins

For dual deploy after certification:

Use metal screws for single deploy (nose stays attached)
Switch to nylon shear pins for dual deploy
2-3 shear pins typically sufficient for Peregrine

Descent Rate Calculations¶

See Ejection Charges for sizing.

Target descent rates:

Phase	Target Rate
Drogue	50-75 ft/s (fast but controlled)
Main	15-20 ft/s (soft landing)

Build Photos¶

Photos to be added during construction