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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 18 motors that fit and appear to have enough thrust (793 motors didn't fit). All motors had thrust curves available and 35 flight simulations were performed. Browse the motors that did and didn't work right here or download the results as a spreadsheet.

The Rocket

Rocket Name:   Estes Alpha III
Owner: Charles (Casey) Barker
Body Diameter: 24.9mm
Dry Weight: 34g
MMT Diameter: 18.0mm
MMT Length: 70.0mm
CD: 0.75
Web Site:

Motors That Work

These motors fit your rocket and appear to have enough thrust to lift it safely. If thrust curves are available, a quick simulation has been run to give a rough idea of the performance of your rocket on this motor. We encourage you to run a more complete simulation with any motor you plan to use; see the simulators page for more info.

  Motor Weight Launch Velocity Accel Altitude Time Delay
warningsW Estes 1/2A6 48g 18m/s 21m/s 16.3G 23m 2.3s 2s
OK Estes A8 50g 19m/s 38m/s 18.9G 69m 3.9s 3s
OK Quest A6 46g 21m/s 42m/s 25.7G 70m 3.8s 3s
OK SCR A3 49g 15m/s 43m/s 17.4G 80m 4.2s 3s
OK Estes B6 53g 22m/s 70m/s 22.7G 159m 5.4s 5s
OK Estes B4 53g 21m/s 71m/s 22.8G 170m 5.6s 5s
OK Quest B6 52g 23m/s 79m/s 27.7G 174m 5.5s 5s
OK SCR B4 53g 16m/s 68m/s 22.4G 174m 5.6s 4s
OK Estes C5 59g 24m/s 96m/s 36.0G 302m 7.0s 5s
OK Quest C6 55g 23m/s 106m/s 33.3G 321m 7.1s 5s
OK Estes C6 58g 21m/s 110m/s 22.4G 328m 7.3s 5s
OK AeroTech C3 58g 19m/s 78m/s 14.9G 336m 7.7s 5s
OK SCR C3 59g 15m/s 92m/s 19.9G 354m 7.9s 5s
OK AeroTech D21 59g 36m/s 240m/s 54.0G 491m 7.3s 6s
OK AeroTech D10 60g 27m/s 203m/s 39.9G 498m 7.5s 6s
OK AeroTech D24 66g 35m/s 232m/s 61.0G 507m 7.7s 7s
OK AeroTech D13 66g 28m/s 195m/s 34.1G 517m 7.9s 6s
OK AeroTech D2 63g 18m/s 75m/s 15.3G 671m 12.6s 4s

W Motor total weight unknown, lift-off Weight not accurate.

Don't like the units? Login to set your preferences. Don't understand the results? See the motor guide help page.

Download the Results

The data is presented in a compact form in the tables above, broken down by motors that worked and those that did not. If you would like to analyze the data further, this section provides download links for files in a generic spreadsheet format (comma-separated value, or CSV) that can be opened with almost any spreadsheet program.

CSV Excel   Download full details of the simulation runs with the various motors:
that worked, that failed, or all of them.
RockSim   Download the list of motors that fit your rocket into a batch for use with SMARTSim. (See the Simulators page for more info.)

You should download these files to your machine and then open them. Normally, clicking the link will prompt you to do this. However, if your browser insists on opening the file as plain text, you can right-click (control-click on the Mac) on the link and chose Save File As (or similar).

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