Changes

So you've launched your rocket and watched it fly upwards as good rockets do. Now you need to bring it back safely. A standard parachute recovery for an L1 rocket involves deploying a single main parachute out of the rocket at apogee. Apogee is the highest point of a rocket trajectory, where the vertical velocity is momentarily zero and the rocket transitions from ascent to descent. This is the point at which the rocket is moving slowest and is ideal for parachute deployment. This is to allow the parachute to properly deploy and minimize aerodynamic forces on it while it deploys.

So you've launched your rocket and watched it fly upwards as good rockets do. Now you need to bring it back safely. A standard parachute recovery for an L1 rocket involves deploying a single main parachute out of the rocket at apogee. Apogee is the highest point of a rocket trajectory, where the vertical velocity is momentarily zero and the rocket transitions from ascent to descent. This is the point at which the rocket is moving slowest and is ideal for parachute deployment. This is to allow the parachute to properly deploy and minimize aerodynamic forces on it while it deploys.

For typical L1 rockets, after the motor burns through its main propellant, it burns through a delay grain. This is a slow-burning section at the end of the motor which acts as a timer. Once the delay grain, the flame front ignites the ejection charge, which pressurizes the body tube of the rocket and forces the nose cone out, along with the parachute. To test whether your nose cone has the proper fit (tight enough to stay on during flight but loose enough to eject for recovery), hold the back end your completed, but unloaded rocket to your mouth and blow hard with a good seal. The nose cone and parachute should both pop out.

For typical L1 rockets, after the motor burns through its main propellant, it burns through a delay grain. This is a slow-burning section at the end of the motor which acts as a timer. Once the delay grain, the flame front ignites the ejection charge, which pressurizes the body tube of the rocket and forces the nose cone out, along with the parachute. To test whether your nose cone has the proper fit (tight enough to stay on during flight but loose enough to eject for recovery), hold the back end of your completed, unloaded rocket to your mouth and blow hard with a good seal. The nose cone and parachute should both pop out.

== Simulations ==

== Simulations ==

== NFPA 1127 and FAA 101 ==

== NFPA 1127 and FAA 101 ==

'''''Note: Might be better to just give summaries of each relevant sections and only post links to full documents. Someone please fix.'''''

'''''Note: Might be better to just give summaries of each relevant section and only post links to full documents. Someone please fix.'''''

The National Fire Protection Association has multiple documents spanning different types of rocketry. Section 1122 governs model rockets and 1127 governs high powered rockets. We are most interested in 1127.  

The National Fire Protection Association has multiple documents spanning different types of rocketry. Section 1122 governs model rockets and 1127 governs high powered rockets. We are most interested in 1127.