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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 55 motors that fit and appear to have enough thrust (694 motors didn't fit, 42 motors failed safety checks). 95 motor had thrust curves available and 184 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:   G Force
Owner: Kevin Katz
Body Diameter: 4.00in
Dry Weight: 40.5oz
MMT Diameter: 29.0mm
MMT Length: 12.00in
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 Cesaroni F120 44.2oz 60ft/s 130ft/s 10.6G 241ft 4.0s 3s
OK Cesaroni G88 45.9oz 49ft/s 177ft/s 8.1G 431ft 5.3s 4s
OK AeroTech G104 45.3oz 57ft/s 181ft/s 8.7G 449ft 5.3s 4s
OK AeroTech G74 43.6oz 48ft/s 182ft/s 6.5G 458ft 5.5s 4s
OK AeroTech G79 46.0oz 48ft/s 211ft/s 6.7G 599ft 6.2s 5s
OK Cesaroni G83 45.6oz 49ft/s 214ft/s 6.9G 603ft 6.2s 5s
OK Cesaroni G250 45.5oz 84ft/s 260ft/s 21.6G 639ft 6.0s 5s
OK AeroTech G76 45.7oz 62ft/s 211ft/s 10.9G 668ft 6.4s 4s
OK Cesaroni G126 45.6oz 62ft/s 250ft/s 11.5G 677ft 6.3s 5s
OK AeroTech G64 45.8oz 53ft/s 207ft/s 7.5G 686ft 6.6s 4s
OK AeroTech G75 45.1oz 49ft/s 227ft/s 7.0G 704ft 6.6s 5s
OK Cesaroni G131 47.6oz 58ft/s 262ft/s 10.2G 721ft 6.5s 5s
OK AeroTech G78 44.9oz 49ft/s 239ft/s 7.1G 721ft 6.7s 5s
OK AeroTech G125 44.9oz 60ft/s 274ft/s 10.8G 750ft 6.5s 6s
OK AeroTech G80 45.0oz 51ft/s 249ft/s 7.3G 772ft 6.8s 5s
OK Cesaroni G106 47.1oz 49ft/s 276ft/s 9.0G 808ft 6.9s 6s
OK KBA G135 48.5oz 57ft/s 295ft/s 10.4G 837ft 6.9s 6s
OK Cesaroni G125 47.4oz 62ft/s 317ft/s 11.3G 953ft 7.3s 6s
OK Cesaroni G118 47.1oz 56ft/s 314ft/s 10.9G 954ft 7.3s 6s
OK AeroTech H165 47.6oz 67ft/s 333ft/s 13.2G 956ft 7.2s 6s
OK Cesaroni G54 47.3oz 54ft/s 235ft/s 8.2G 973ft 7.9s 5s
OK Cesaroni H175 49.2oz 67ft/s 344ft/s 14.8G 974ft 7.2s 6s
OK Cesaroni H133 47.2oz 64ft/s 324ft/s 13.6G 979ft 7.3s 6s
OK Cesaroni H410 46.9oz 109ft/s 389ft/s 38.6G 990ft 6.9s 6s
OK Cesaroni H163 47.1oz 69ft/s 347ft/s 15.6G 1,001ft 7.3s 6s
OK Cesaroni H90 46.2oz 56ft/s 302ft/s 11.1G 1,007ft 7.6s 6s
OK Cesaroni H87 47.7oz 52ft/s 299ft/s 8.7G 1,013ft 7.7s 6s
OK AeroTech G138 45.7oz 60ft/s 357ft/s 12.4G 1,014ft 7.3s 6s
OK Cesaroni H54 47.9oz 48ft/s 242ft/s 6.6G 1,020ft 8.2s 5s
OK AeroTech H128 47.8oz 67ft/s 340ft/s 12.6G 1,023ft 7.4s 6s
OK AeroTech H238 47.4oz 78ft/s 363ft/s 16.8G 1,033ft 7.3s 6s
OK Cesaroni H123 48.5oz 55ft/s 338ft/s 9.3G 1,044ft 7.6s 6s
OK AeroTech H115 47.7oz 56ft/s 334ft/s 8.2G 1,068ft 7.7s 6s
OK AeroTech H97 50.3oz 50ft/s 322ft/s 6.8G 1,102ft 8.0s 6s
OK Cesaroni H118 48.7oz 62ft/s 340ft/s 11.5G 1,113ft 7.7s 6s
OK Cesaroni H237 50.9oz 81ft/s 420ft/s 18.0G 1,184ft 7.6s 7s
OK AeroTech H220 49.3oz 84ft/s 417ft/s 21.4G 1,197ft 7.6s 7s
OK AeroTech H210 49.2oz 78ft/s 422ft/s 17.4G 1,218ft 7.7s 7s
OK Cesaroni H151 48.9oz 71ft/s 388ft/s 14.0G 1,221ft 7.9s 6s
OK KBA H130 65.5oz 58ft/s 337ft/s 11.1G 1,261ft 8.4s 7s
OK Cesaroni H170 48.7oz 75ft/s 414ft/s 16.5G 1,271ft 7.9s 7s
OK AeroTech H182 47.8oz 68ft/s 433ft/s 13.0G 1,275ft 7.9s 7s
OK Cesaroni H160 50.1oz 66ft/s 414ft/s 12.3G 1,277ft 8.0s 7s
OK Cesaroni H135 49.4oz 63ft/s 390ft/s 11.1G 1,280ft 8.1s 6s
OK AeroTech H180 49.4oz 77ft/s 434ft/s 17.4G 1,310ft 8.0s 7s
OK AeroTech H250 49.5oz 89ft/s 462ft/s 22.4G 1,321ft 7.9s 7s
OK KBA H225 51.6oz 68ft/s 468ft/s 17.0G 1,365ft 8.2s 7s
OK AeroTech H135 48.0oz 62ft/s 391ft/s 10.5G 1,369ft 8.4s 6s
OK AeroTech H195 47.4oz 84ft/s 469ft/s 18.3G 1,374ft 8.0s 7s
OK Cesaroni H194 50.5oz 75ft/s 468ft/s 19.1G 1,449ft 8.2s 7s
OK Cesaroni H200 50.2oz 78ft/s 474ft/s 19.8G 1,473ft 8.3s 7s
OK Cesaroni H255 48.7oz 92ft/s 527ft/s 26.8G 1,514ft 8.2s 7s
OK Cesaroni H140 50.3oz 75ft/s 440ft/s 16.6G 1,539ft 8.6s 7s
OK AeroTech I205 51.6oz 81ft/s 562ft/s 24.4G 1,829ft 8.9s 7s
warningsW,D Estes G80 44.9oz 6:1 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 (16ft/s)
failedG AeroTech E23 speed at end of launch guide too slow (27ft/s)
failedG AeroTech E16 speed at end of launch guide too slow (21ft/s)
failedG AeroTech F23 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (29ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (27ft/s)
failedG Estes F15 speed at end of launch guide too slow (13ft/s)
failedG AeroTech F37 speed at end of launch guide too slow (31ft/s)
failedG AeroTech F62 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (31ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (26ft/s)
failedG AeroTech F42 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni F29 speed at end of launch guide too slow (25ft/s)
failedG Cesaroni F31 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni F59 speed at end of launch guide too slow (41ft/s)
failed5 Estes F26 average thrust fails 5:1 thrust/weight ratio (2:1)
failedG AeroTech F26 speed at end of launch guide too slow (26ft/s)
failedG AeroTech F22 speed at end of launch guide too slow (23ft/s)
failedG AeroTech F52 speed at end of launch guide too slow (45ft/s)
failedG Apogee F10 speed at end of launch guide too slow (17ft/s)
failedG AeroTech F50 speed at end of launch guide too slow (43ft/s)
failedG Estes F50 speed at end of launch guide too slow (44ft/s)
failedG AeroTech F25 speed at end of launch guide too slow (36ft/s)
failedG AeroTech F40 speed at end of launch guide too slow (39ft/s)
failedG AeroTech G54 speed at end of launch guide too slow (43ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (33ft/s)
failedG AeroTech G53 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni G80 speed at end of launch guide too slow (46ft/s)
failedG Estes G40 speed at end of launch guide too slow (41ft/s)
failedG AeroTech G77 speed at end of launch guide too slow (46ft/s)
failedG AeroTech G77 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G57 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni G68 speed at end of launch guide too slow (43ft/s)
failedG AeroTech G79 speed at end of launch guide too slow (42ft/s)
failedG AeroTech G40 speed at end of launch guide too slow (41ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (29ft/s)
failedG AeroTech G75 speed at end of launch guide too slow (42ft/s)
failedG KBA G82 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (27ft/s)
failedG Cesaroni H42 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni H53 speed at end of launch guide too slow (42ft/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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