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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 16 motors that fit and appear to have enough thrust (784 motors didn't fit, 2 motors failed safety checks). 18 motor had thrust curves available and 33 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:   BT 55 Missile
Owner: Rocket Abyss
Body Diameter: 1.32in
Dry Weight: 87g
MMT Diameter: 18.0mm
MMT Length: 70.0mm
CD: 0.75

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
OK Quest A6 99g 52ft/s 57ft/s 11.2G 57ft 2.1s 2s
OK SCR A3 102g 48ft/s 60ft/s 7.8G 69ft 2.4s 2s
OK Estes B6 102g 53ft/s 111ft/s 11.2G 205ft 3.8s 3s
warningsW Estes B4 106g 48ft/s 106ft/s 10.8G 206ft 3.9s 3s
OK SCR B4 106g 57ft/s 103ft/s 10.7G 216ft 4.0s 3s
warningsW Quest B6 103g 56ft/s 123ft/s 13.4G 231ft 3.9s 3s
OK AeroTech C3 111g 51ft/s 135ft/s 7.3G 531ft 6.2s 3s
OK Quest C6 108g 66ft/s 184ft/s 16.4G 551ft 6.1s 4s
warningsW Estes C5 112g 77ft/s 188ft/s 19.1G 555ft 6.0s 4s
warningsW Estes C6 110g 51ft/s 193ft/s 11.3G 564ft 6.2s 4s
OK SCR C3 112g 50ft/s 163ft/s 10.0G 587ft 6.7s 4s
OK AeroTech D10 113g 79ft/s 395ft/s 20.7G 1,120ft 7.2s 6s
OK AeroTech D2 116g 53ft/s 130ft/s 7.9G 1,124ft 11.1s 3s
OK AeroTech D13 119g 82ft/s 386ft/s 18.5G 1,139ft 7.3s 6s
OK AeroTech D24 119g 106ft/s 452ft/s 33.4G 1,142ft 7.1s 6s
OK AeroTech D21 112g 102ft/s 461ft/s 27.9G 1,143ft 7.0s 6s

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.

Motors That Fail

These motors fit your rocket, but failed one safety check or another. They may actually work, but you should use them only with caution. We encourage you to run a more complete simulation to verify flight safety; see the simulators page for more info.

  Motor Reason
failed5 Estes 1/2A6 average thrust fails 5:1 thrust/weight ratio (4:1)
failedG Estes A8 speed at end of launch guide too slow (40ft/s)

G These simulations were run with a launch guide length of 6ft (rod, rail or tower). If this is not correct, launch guide lengths can be specified for your saved rockets. (The minimum velocity required is approximately 15m/s or 50ft/s.)

5 The 5:1 thrust-to-weight ratio check is a useful rule of thumb, but it does break down for motors with unusual thrust curves. For example, motors with a high initial thrust and a long tail-off may fail this test but still be safe for use.

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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