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.

Estes Big Bertha

Estes - Big Bertha {Kit} (1948, 23, 7007)

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 A22.443:18:1206.9547.896.51.401.903.10109
Apogee 1/2A22.363:16:1167.1824.396.60.721.101.6228
Estes A3T2.504:110:1250.4246.833.61.071.902.7798
Estes A10T2.384:121:1562.9031.991.40.851.402.0554
MPC 1/2A3-M2.435:18:1213.0025.943.10.461.201.4626
Estes 1/2A3T2.435:112:1340.2324.912.00.381.101.2823
Quest C63.065:125:1591.31111.442.12.633.405.83526
Estes A82.785:116:1376.6240.761.80.811.702.3169
Estes 1/2A62.696:113:1316.2420.142.00.330.901.0313
Apogee C42.806:118:1434.57115.791.72.423.405.62558
Estes C52.956:133:1775.52145.671.42.043.705.54581
Estes B42.877:121:1521.5279.621.31.042.803.64204
Weco C62.948:120:1404.67106.051.71.753.304.85365
Estes C63.028:123:1481.26143.321.51.863.805.46511
Estes B62.848:120:1467.2987.461.60.863.003.66212
Quest A62.748:119:1407.3837.831.80.471.601.8752
Quest A8 Q-Jet2.668:118:1351.3836.672.00.401.601.8044
FSI A62.779:119:1405.7528.631.60.551.101.4529
Aerotech C6W3.0110:119:1443.58171.601.71.653.805.25565
Quest B62.7710:124:1468.86100.581.60.843.103.74237
Apogee B72.5211:124:1656.53112.421.30.793.303.89279
Aerotech D82.8712:125:1641.26249.471.12.483.906.18973
Apogee C102.8216:142:11091.02184.120.81.053.904.75514
Aerotech C12T2.9718:134:1726.33180.611.21.004.004.80508
Aerotech D13W3.3718:136:1820.61276.310.81.744.305.84895
Aerotech D10W3.1120:141:11012.27289.490.81.444.405.64868
Apogee D103.1122:141:11017.98291.980.81.444.405.64873
Aerotech D21T3.0834:153:11321.98339.650.60.944.705.44844
Aerotech D24T3.2936:168:1965.71288.900.80.954.705.45779
Aerotech E25T2.9138:173:12007.28396.750.51.024.505.32913

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.