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 Astron Cobra

Estes - Astron Cobra {Kit} (K-10)

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 A22.743:17:1179.7440.728.31.401.702.9087
Apogee 1/2A22.663:16:1144.2620.178.20.720.901.4221
Estes A3T2.803:18:1218.9540.765.11.041.702.5479
Estes A10T2.693:118:1523.3629.201.40.861.301.9648
MPC 1/2A3-M2.734:17:1185.4820.154.20.520.901.2217
Estes 1/2A3T2.734:111:1298.4823.612.90.421.101.3222
Quest C63.365:122:1549.58105.232.22.643.305.74496
Estes A83.085:114:1344.5837.731.90.821.602.2261
Estes 1/2A62.995:111:1280.5920.242.20.351.001.1513
Apogee C43.105:116:1392.45110.101.92.433.405.63529
Estes C53.256:129:1654.31137.501.42.043.705.54556
Estes B43.176:118:1465.7272.641.41.052.703.55185
Weco C63.247:118:1380.3196.911.81.763.204.76337
Estes C63.327:120:1453.65134.511.61.873.805.47490
Estes B63.147:117:1442.8479.691.60.872.903.57193
Quest A63.047:117:1390.3533.411.80.481.501.7843
FSI A63.078:117:1372.3823.161.80.461.001.2620
Aerotech C6W3.319:117:1399.60159.441.81.663.805.26548
Quest B63.079:121:1446.1791.401.60.753.103.65217
Apogee B72.8210:121:1593.43101.471.40.793.203.79258
Aerotech D83.1710:122:1573.80234.201.22.484.006.28972
Apogee C103.1214:137:1976.91170.240.81.064.004.86501
Aerotech C12T3.2715:130:1648.15166.871.21.004.104.90492
Aerotech D13W3.6616:132:1743.58262.480.91.754.405.95897
Aerotech D10W3.4118:136:1910.31275.880.81.444.605.84875
Apogee D103.4119:136:1915.41277.840.91.454.605.85879
Aerotech D21T3.3830:146:11188.68321.710.70.944.905.64856
Aerotech D24T3.5931:159:1874.03274.490.80.954.905.65782
Aerotech E25T3.2133:164:11791.22378.350.61.024.705.52935

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.