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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 (783 motors didn't fit, 6 motors failed safety checks). 22 motor had thrust curves available and 41 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:   Dragonfly LP (Scratch Built)
Owner: Michael J Zaborowski
Body Diameter: 1.50in
Dry Weight: 4.5oz
MMT Diameter: 18.0mm
MMT Length: 3.00in
CD: 0.80

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 Estes B6 5.2oz 49ft/s 70ft/s 7.5G 102ft 2.8s 2s
OK SCR B4 5.2oz 57ft/s 67ft/s 7.4G 115ft 3.1s 2s
OK Quest B6 5.1oz 55ft/s 81ft/s 9.1G 122ft 3.0s 2s
OK Quest B4 5.2oz 51ft/s 73ft/s 4.0G 124ft 3.2s 2s
OK AeroTech C3 5.3oz 57ft/s 88ft/s 5.1G 314ft 5.2s 2s
OK Quest C6 5.2oz 58ft/s 124ft/s 11.6G 337ft 5.2s 3s
OK Estes C6 5.4oz 48ft/s 131ft/s 7.9G 343ft 5.3s 3s
OK Estes C5 5.4oz 71ft/s 130ft/s 13.7G 349ft 5.1s 3s
OK SCR C3 5.4oz 56ft/s 108ft/s 7.1G 351ft 5.7s 3s
OK Quest C12 5.3oz 77ft/s 184ft/s 10.5G 410ft 5.1s 4s
OK Quest D16 5.4oz 88ft/s 237ft/s 13.2G 554ft 5.6s 5s
OK AeroTech D2 5.5oz 59ft/s 88ft/s 5.6G 649ft 9.8s 2s
OK AeroTech D10 5.4oz 99ft/s 298ft/s 14.9G 857ft 6.7s 5s
OK AeroTech D13 5.6oz 102ft/s 293ft/s 13.6G 869ft 6.7s 5s
OK AeroTech D24 5.6oz 124ft/s 342ft/s 24.6G 883ft 6.6s 6s
OK AeroTech D21 5.4oz 120ft/s 346ft/s 20.2G 889ft 6.6s 6s

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 (3:1)
failed5 Quest A6 average thrust fails 5:1 thrust/weight ratio (3:1)
failedG SCR A3 speed at end of launch guide too slow (37ft/s)
failedG Estes A8 speed at end of launch guide too slow (21ft/s)
failedG Quest A3 speed at end of launch guide too slow (31ft/s)
failedG Estes B4 speed at end of launch guide too slow (44ft/s)

G These simulations were run with a launch guide length of 12ft (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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