So we have come across the question of how we are going to get the rocket back and have decided on a parachute like most people do. In this post we will explain:

WHAT the parachute is and dose

WHY we need it

HOW we are going to make it.

WHAT the parachute is and dose

WHY we need it

HOW we are going to make it.

## WHAT a parachute is and dose

A parachute is a peace of normally fabric or plastic that slows the fall of an object using drag and air/wind resistance.

## WHY we need it

It is only needed to recover the rocket and its cargo so we can get any info that was obtained on the fight. we also need it for any launches near people or property, I'm think you would like it more seeing a parachute and cargo land on your roof than a flaming reck smash into your living room. :)

We also need this to please any health and safety measures and laws on flight etc...

We also need this to please any health and safety measures and laws on flight etc...

## HOW we are going to make it

To find out how big the parachute needs to be we use this equation:

sqrt ((8 m g)/(p r Cd V squared))

lets explain it

sqrt means square root (If you don't know what that is you shouldn't know about this equation)

m = mass (of cargo the parachute holds)

g = gravitational force on it (that is ~9.8)

/ = divided by

p = pi (3.14159265359 or just 3.14)

r = air density (~1.22kg/m3)

Cd = drag coefficient of the parachute (don't worry its hard to work out just put in 0.75)

V = the speed you want it to land at (about 3m/s or less!)

if you need more help comment below :)

- Daniel

sqrt ((8 m g)/(p r Cd V squared))

lets explain it

sqrt means square root (If you don't know what that is you shouldn't know about this equation)

m = mass (of cargo the parachute holds)

g = gravitational force on it (that is ~9.8)

/ = divided by

p = pi (3.14159265359 or just 3.14)

r = air density (~1.22kg/m3)

Cd = drag coefficient of the parachute (don't worry its hard to work out just put in 0.75)

V = the speed you want it to land at (about 3m/s or less!)

if you need more help comment below :)

- Daniel