Model Rocket Simulator

Rocket Design

Rocket mass at liftoff without motor(s)	g
Diameter of rocket, widest part	mm
Diameter of parachute	cm
Motor
Number of parallel motors

Flight Simulation Results

Ignition time		s

Liftoff time		s
Rod time		s
Rod velocity		m/s

Burnout time		s
Burnout altitude		m
Burnout velocity		m/s
Total impulse		N·s
Specific impulse		s
Exhaust velocity		m/s

Maximum G-load		G

Apogee¹ time		s
Apogee altitude		m

Deploy time		s
Deploy altitude		m
Deploy velocity		m/s

Landing time		s
Landing velocity		m/s
¹Apogee = maximum altitude

About

This is a very simple model rocket simulation program. It takes published thrust curve data and interpolates that linearly.

Features:

dt = 10 ms
g = 9.8 m/s²
Air density calculation is based on a temperature lapse rate of -0.0065 K/m, so only valid up until 11 km.
C_d = 0.5 (Don't ask. Okay, ask.)

Future improvements I'm considering:

Complete modeling of the International Standard Atmosphere
More detailed gravity model: Decreasing gravitational acceleration with altitude
More rocket motors :)
Real time simulation (with JavaScript!)
Two-dimensional simulation for wind, downrange distance and gravity turn
Actually measuring the drag coefficient of a real rocket
Variable timesteps
Support for multistage rockets

Let me know what you think!

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