Rocket Motor Guide

Enter the name of the rocket. You can optionally select a rocket from the list that may appear as you type.
Enter the diameter of the rocket's body.
Enter the weight of the rocket without the motor.
Enter the diameter of the rocket's motor mount. This sets the largest diameter motor which will fit.
Enter the length of the rocket's motor mount. This sets the longest motor which will fit.
Select the approximate drag of the rocket. Sleeker rockets with a smooth finish will have lower drag.

Semroc Little Joe II

Semroc - Little Joe II {Kit} (KS-3)

MotorWeight
oz
TTW
Average
TTW
Peak
Accel
f/s2
Speed
mph
Rod
Len
feet
Burnout Time
sec
Optimal
Delay
sec
Time to
Apogee
sec
Altitude
feet
Apogee A21.745:112:1309.2264.163.41.332.003.13140
Apogee 1/2A21.655:110:1253.8739.473.70.651.501.9552
Estes A3T1.805:114:1366.5759.201.71.081.902.78117
Estes A10T1.696:130:1665.1340.191.20.931.502.2368
Estes 1/4A3T1.716:112:1305.7920.192.20.290.900.9913
Apogee 1/4A21.636:113:1357.0820.162.20.270.900.9713
MPC 1/2A3-M1.737:112:1313.4632.872.00.491.301.5937
Estes 1/2A3T1.737:118:1494.2430.681.40.441.301.5433
Quest C62.368:137:1727.5398.141.92.602.404.80430
Estes A82.078:123:1453.3550.561.60.791.802.3985
Estes 1/2A61.998:119:1400.3421.411.80.401.001.2017
Apogee C42.109:127:1563.44124.471.42.402.404.60437
Estes C52.249:149:11185.76122.361.22.022.504.32439
Estes B42.1710:131:1660.8091.031.21.122.303.22191
Weco C62.2411:130:1505.07102.271.51.732.403.93312
Estes C62.3111:134:1571.28128.061.41.942.604.34398
Estes B62.1412:129:1528.57102.961.40.942.403.14195
Quest A62.0412:128:1464.4653.151.60.451.802.0572
Quest A8 Q-Jet1.9612:127:1631.1563.231.70.471.902.1784
FSI A62.0713:128:1530.0556.601.50.531.702.0371
Aerotech C6W2.3114:128:1579.88173.671.41.632.503.93405
Quest B62.0715:135:1535.30122.421.40.822.503.12209
Apogee B71.8216:135:1756.19131.991.20.772.402.97220
Aerotech D82.1717:137:1882.25232.430.92.462.404.66672
Apogee C102.1224:162:11494.45192.030.61.042.603.44354
Aerotech C12T2.2726:149:1996.65189.011.10.992.803.59356
Aerotech D13W2.6627:153:11078.82254.040.71.732.704.23593
Aerotech D10W2.4130:160:11365.60266.000.61.432.804.03566
Apogee D102.4132:160:11374.09268.240.61.432.804.03568
Aerotech D21T2.3850:177:11786.21312.550.61.042.903.74524
Aerotech D24T2.5952:199:11234.59262.160.70.943.203.94501
Aerotech E25T2.2156:1107:12702.90357.360.51.022.803.62555

Weight - The total weight of the rocket, with motor, at lift-off.

TTW Average - The average thrust-to-weight ratio of the rocket.

TTW Peak - The peak thrust-to-weight ratio of the rocket.

Accel - The maximum acceleration experienced by the rocket.

Speed - The maximum speed experienced by the rocket.

Rod Len - The minimal rod/rail length for the rocket to reach a safe speed (9 m/s) for free flight.

Optimal Delay - The optimal delay time (equal to the time from burnout to apogee).

Altitude - The altitude at apogee.

Note: These simulation results should be used with caution. Always double-check to ensure that your flight will be safe.

The Rocket Motor Guide helps you choose the right motor to use in your rocket by running a simulation using each of the motors in the RocketReviews.com motor database.