Parachute design is quite well covered in model rocket design. So rather than explain the theory again. Some useful links are:

Background information

• Apogee Rockets background information
• Nakka Rocketry

Calculators

• Descent rate calculator
• Size Calculator Fruity Chutes (This needs a lot of data)

Templates Scott Bryce template designer

Parachute clip Parachute

Design

Build

Test

iterations graphs tracker testing 7m and 7km?

Lessons learnt