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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 54 motors that fit and appear to have enough thrust (717 motors didn't fit, 20 motors failed safety checks). 72 motor had thrust curves available and 139 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:   Piranha
Owner: Bradley L Smith
Body Diameter: 2.60in
Dry Weight: 25.6oz
MMT Diameter: 29.0mm
MMT Length: 8.00in
CD: 0.70

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 AeroTech F62 29.4oz 50ft/s 178ft/s 6.8G 486ft 5.7s 5s
OK Cesaroni F120 29.3oz 76ft/s 205ft/s 16.6G 532ft 5.7s 5s
OK AeroTech F42 28.3oz 53ft/s 179ft/s 7.7G 537ft 6.0s 5s
OK Cesaroni F59 29.1oz 53ft/s 193ft/s 7.7G 541ft 6.0s 5s
OK AeroTech F50 28.6oz 55ft/s 227ft/s 8.1G 731ft 6.8s 5s
OK AeroTech F25 28.8oz 48ft/s 192ft/s 6.2G 733ft 7.2s 4s
OK AeroTech F52 29.9oz 56ft/s 227ft/s 8.5G 756ft 7.0s 6s
OK AeroTech F40 30.1oz 51ft/s 221ft/s 7.1G 815ft 7.4s 5s
warningsW Estes F50 28.5oz 55ft/s 252ft/s 8.9G 859ft 7.3s 6s
OK AeroTech G54 30.4oz 53ft/s 248ft/s 8.6G 862ft 7.4s 6s
OK Cesaroni G88 31.0oz 61ft/s 279ft/s 12.5G 906ft 7.4s 6s
OK AeroTech G104 30.4oz 70ft/s 286ft/s 13.4G 938ft 7.4s 6s
OK AeroTech G74 28.7oz 59ft/s 297ft/s 10.4G 983ft 7.7s 6s
OK AeroTech G53 30.7oz 58ft/s 268ft/s 9.1G 1,012ft 8.0s 6s
OK Cesaroni G80 30.7oz 58ft/s 310ft/s 10.6G 1,058ft 7.9s 7s
warningsW Estes G40 29.9oz 53ft/s 280ft/s 7.8G 1,140ft 8.4s 6s
OK AeroTech G40 29.9oz 53ft/s 280ft/s 7.8G 1,140ft 8.4s 6s
OK AeroTech G77 31.4oz 53ft/s 321ft/s 9.4G 1,141ft 8.3s 7s
OK AeroTech G77 29.9oz 58ft/s 339ft/s 10.8G 1,188ft 8.3s 7s
OK AeroTech G79 31.1oz 60ft/s 335ft/s 10.4G 1,222ft 8.4s 7s
OK Cesaroni G83 30.7oz 64ft/s 340ft/s 10.7G 1,231ft 8.4s 7s
OK Cesaroni G68 31.1oz 53ft/s 326ft/s 9.6G 1,232ft 8.6s 7s
OK AeroTech G79 30.0oz 51ft/s 332ft/s 8.7G 1,243ft 8.6s 7s
OK Cesaroni G57 30.7oz 56ft/s 313ft/s 9.3G 1,248ft 8.7s 7s
OK Cesaroni G250 30.6oz 102ft/s 399ft/s 33.1G 1,279ft 8.2s 8s
OK AeroTech G76 30.8oz 76ft/s 337ft/s 16.6G 1,340ft 8.6s 7s
OK Cesaroni G126 30.7oz 76ft/s 390ft/s 17.6G 1,355ft 8.5s 8s
OK AeroTech G64 30.9oz 65ft/s 333ft/s 11.6G 1,379ft 8.9s 6s
OK AeroTech G75 30.2oz 61ft/s 365ft/s 11.0G 1,415ft 8.9s 7s
OK Cesaroni G131 32.7oz 71ft/s 403ft/s 15.3G 1,420ft 8.7s 8s
OK AeroTech G78 30.0oz 59ft/s 383ft/s 11.2G 1,449ft 8.9s 7s
OK AeroTech G125 30.0oz 74ft/s 431ft/s 17.0G 1,489ft 8.8s 8s
OK AeroTech G80 30.1oz 65ft/s 398ft/s 11.4G 1,537ft 9.1s 7s
OK Cesaroni G106 32.2oz 62ft/s 430ft/s 13.7G 1,586ft 9.2s 8s
OK KBA G82 33.7oz 53ft/s 403ft/s 9.5G 1,618ft 9.6s 8s
OK KBA G135 33.6oz 68ft/s 450ft/s 15.8G 1,627ft 9.3s 8s
OK AeroTech G75 33.8oz 51ft/s 404ft/s 7.5G 1,715ft 10.0s 8s
OK AeroTech H165 32.7oz 82ft/s 510ft/s 20.0G 1,832ft 9.5s 8s
OK Cesaroni G125 32.5oz 74ft/s 490ft/s 16.9G 1,832ft 9.7s 8s
OK Cesaroni G118 32.2oz 68ft/s 487ft/s 16.4G 1,839ft 9.7s 8s
OK Cesaroni H133 32.3oz 76ft/s 501ft/s 20.4G 1,878ft 9.7s 8s
OK Cesaroni G54 32.4oz 69ft/s 380ft/s 12.4G 1,885ft 10.3s 7s
OK Cesaroni H410 32.0oz 130ft/s 586ft/s 58.0G 1,889ft 9.3s 9s
OK Cesaroni H163 32.2oz 86ft/s 533ft/s 23.3G 1,913ft 9.7s 9s
OK Cesaroni H90 31.3oz 69ft/s 480ft/s 16.8G 1,936ft 10.0s 8s
OK Cesaroni H87 32.8oz 62ft/s 471ft/s 13.1G 1,946ft 10.2s 8s
OK AeroTech G138 30.8oz 73ft/s 557ft/s 19.3G 1,947ft 9.7s 9s
OK AeroTech H128 32.9oz 81ft/s 524ft/s 19.0G 1,947ft 9.8s 8s
OK AeroTech H238 32.5oz 94ft/s 554ft/s 25.3G 1,962ft 9.6s 9s
OK Cesaroni H54 33.0oz 60ft/s 392ft/s 10.0G 1,970ft 10.6s 7s
OK AeroTech H115 32.8oz 69ft/s 522ft/s 12.6G 2,029ft 10.1s 8s
OK AeroTech H182 32.9oz 84ft/s 669ft/s 19.8G 2,375ft 10.4s 9s
OK AeroTech H195 32.5oz 100ft/s 723ft/s 27.1G 2,535ft 10.5s 9s
warningsW,D Estes G80 30.0oz 9:1 thrust/weight ratio (no data)

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

D No simulation data found for this motor.

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
failedG Estes E16 speed at end of launch guide too slow (26ft/s)
failedG AeroTech E23 speed at end of launch guide too slow (37ft/s)
failedG AeroTech E16 speed at end of launch guide too slow (31ft/s)
failedG AeroTech F23 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (39ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (36ft/s)
failedG Estes F15 speed at end of launch guide too slow (24ft/s)
failedG AeroTech F37 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (40ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni F29 speed at end of launch guide too slow (33ft/s)
failedG Cesaroni F31 speed at end of launch guide too slow (37ft/s)
failed5 Estes F26 average thrust fails 5:1 thrust/weight ratio (3:1)
failedG AeroTech F26 speed at end of launch guide too slow (36ft/s)
failedG AeroTech F22 speed at end of launch guide too slow (31ft/s)
failedG Apogee F10 speed at end of launch guide too slow (28ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (43ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (35ft/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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