Model Rocketry
Calculators for model rocketeers: thrust to weight ratio, estimated altitude, parachute descent rate and ejection delay, with the physics shown.
Parachute Descent Calculator
Calculate the descent rate of a model rocket under a parachute from mass, chute diameter, drag coefficient and air density. Free landing speed tool.
Rocket Altitude Calculator
Estimate the peak altitude of a model rocket from motor thrust, burn time and mass. A no drag kinematic model giving an optimistic upper bound.
Rocket Ejection Delay Calculator
Find the ideal motor ejection delay for a model rocket so the parachute deploys at apogee. Uses burnout velocity or thrust, burn time and mass.
Rocket Stability Calculator
Check model rocket stability from the center of gravity, center of pressure and body diameter. Finds the static margin in calibers and the 1 to 2 rule.
Thrust to Weight Calculator
Calculate the launch thrust to weight ratio of a model rocket from motor thrust and mass. Checks the 5 to 1 safe launch rule. Free and instant.