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 Tau Zero

Semroc - Tau Zero {Kit} (KN-2)

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 A21.237:117:1461.65125.821.71.344.305.44453
Apogee 1/2A21.157:114:1384.9565.832.00.652.703.15148
Estes A3T1.308:121:1537.95106.221.31.053.904.75340
Estes A10T1.198:146:1762.9275.371.10.923.003.72205
Estes 1/4A3T1.219:118:1450.8420.271.50.340.901.0415
Apogee 1/4A21.139:119:1536.7521.441.30.321.001.1218
MPC 1/2A3-M1.2311:118:1405.5652.351.70.462.302.5693
Estes 1/2A3T1.2311:127:1660.8745.511.20.422.002.2273
Quest C61.8611:156:1949.17252.331.72.576.408.771538
Estes A81.5711:135:1511.3182.021.50.773.303.87227
Estes 1/2A61.4912:128:1481.0937.151.60.381.701.8848
Apogee C41.6014:141:1814.44261.121.12.386.408.581559
Estes C51.7414:174:11667.96320.561.12.006.608.401621
Estes B41.6615:146:1770.49155.481.11.115.106.01612
Weco C61.7417:145:1930.59240.081.31.815.907.511125
Estes C61.8117:151:1653.04309.781.21.936.708.431489
Estes B61.6418:144:1616.42171.891.30.935.306.03658
Quest A61.5418:143:1623.9479.681.40.433.203.43191
Quest A8 Q-Jet1.4618:140:1874.4390.211.50.453.503.75228
FSI A61.5720:141:1825.5376.521.30.513.003.31171
Aerotech C6W1.8122:142:1791.42334.661.31.716.808.311571
Quest B61.5722:152:1816.46209.331.20.805.706.30772
Apogee B71.3224:153:11148.30239.370.90.755.806.35859
Aerotech D81.6726:155:11256.05519.690.82.456.909.152531
Apogee C101.6236:193:12025.36361.390.61.046.907.741439
Aerotech C12T1.7739:174:11346.88349.911.00.977.107.871446
Aerotech D13W2.1641:180:11385.27529.940.61.737.909.432437
Aerotech D10W1.9145:190:11814.64579.050.51.427.809.022348
Apogee D101.9148:191:11824.58589.910.61.437.809.032370
Aerotech D21T1.8875:1116:12378.83675.370.51.037.908.732300
Aerotech D24T2.0979:1149:11449.83549.330.60.938.208.932128
Aerotech E25T1.7184:1161:13586.54820.230.41.017.508.312410

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.