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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 74 motors that fit and appear to have enough thrust (677 motors didn't fit, 40 motors failed safety checks). 112 motor had thrust curves available and 223 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:   Mega Der BIG Red Max
Owner: Louie Berlin
Body Diameter: 4.00in
Dry Weight: 3.00lb
MMT Diameter: 29.0mm
MMT Length: 36.00in
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
warningsW Estes F50 3.18lb 48ft/s 126ft/s 4.5G 308ft 4.8s 3s
OK Cesaroni G88 3.34lb 51ft/s 149ft/s 6.8G 348ft 4.9s 4s
OK AeroTech G104 3.30lb 60ft/s 153ft/s 7.3G 366ft 4.9s 4s
OK AeroTech G74 3.19lb 51ft/s 153ft/s 5.4G 369ft 5.1s 4s
OK Cesaroni G80 3.32lb 50ft/s 165ft/s 5.7G 416ft 5.4s 4s
OK AeroTech G77 3.27lb 49ft/s 178ft/s 5.7G 476ft 5.8s 4s
OK AeroTech G79 3.35lb 52ft/s 180ft/s 5.6G 500ft 5.9s 4s
OK Cesaroni G83 3.32lb 53ft/s 182ft/s 5.8G 504ft 5.9s 5s
OK Cesaroni G250 3.31lb 91ft/s 223ft/s 18.5G 552ft 5.7s 5s
OK AeroTech G76 3.32lb 64ft/s 182ft/s 9.2G 567ft 6.1s 4s
OK AeroTech G64 3.33lb 56ft/s 178ft/s 6.3G 580ft 6.3s 4s
OK Cesaroni G126 3.32lb 65ft/s 214ft/s 9.8G 582ft 6.0s 5s
OK AeroTech G75 3.29lb 51ft/s 194ft/s 5.9G 598ft 6.3s 4s
OK AeroTech G78 3.28lb 52ft/s 205ft/s 6.0G 618ft 6.4s 5s
OK Cesaroni G131 3.44lb 61ft/s 225ft/s 8.6G 626ft 6.2s 5s
OK AeroTech G125 3.28lb 64ft/s 235ft/s 9.3G 654ft 6.3s 5s
OK AeroTech G80 3.28lb 54ft/s 214ft/s 6.1G 668ft 6.6s 5s
OK Cesaroni G106 3.41lb 55ft/s 238ft/s 7.6G 706ft 6.7s 5s
OK KBA G135 3.50lb 60ft/s 256ft/s 9.0G 740ft 6.7s 6s
OK Cesaroni G54 3.43lb 56ft/s 206ft/s 6.9G 852ft 7.6s 5s
OK Cesaroni G118 3.41lb 62ft/s 273ft/s 9.3G 856ft 7.2s 6s
OK Cesaroni G125 3.43lb 67ft/s 276ft/s 9.6G 857ft 7.1s 6s
OK AeroTech H165 3.44lb 74ft/s 290ft/s 11.4G 865ft 7.0s 6s
OK Cesaroni H133 3.42lb 69ft/s 283ft/s 11.6G 885ft 7.2s 6s
OK Cesaroni H175 3.54lb 74ft/s 299ft/s 13.1G 885ft 7.1s 6s
OK Cesaroni H54 3.46lb 48ft/s 212ft/s 5.6G 894ft 8.0s 4s
OK Cesaroni H90 3.36lb 60ft/s 265ft/s 9.4G 903ft 7.4s 6s
OK Cesaroni H87 3.45lb 54ft/s 262ft/s 7.4G 906ft 7.6s 6s
OK RATT H70 3.78lb 58ft/s 236ft/s 7.1G 910ft 7.7s 5s
OK Cesaroni H163 3.41lb 73ft/s 302ft/s 13.3G 911ft 7.2s 6s
OK Cesaroni H410 3.40lb 122ft/s 337ft/s 33.2G 914ft 6.9s 6s
OK AeroTech G138 3.33lb 64ft/s 310ft/s 10.8G 923ft 7.3s 6s
OK AeroTech H128 3.45lb 71ft/s 298ft/s 10.8G 933ft 7.3s 6s
OK Cesaroni H123 3.50lb 61ft/s 296ft/s 7.9G 949ft 7.5s 6s
OK AeroTech H238 3.43lb 84ft/s 317ft/s 14.5G 949ft 7.2s 6s
OK AeroTech H115 3.45lb 58ft/s 293ft/s 7.0G 972ft 7.6s 6s
OK AeroTech H97 3.61lb 53ft/s 284ft/s 5.8G 999ft 7.9s 6s
OK Cesaroni H118 3.51lb 64ft/s 301ft/s 9.9G 1,019ft 7.7s 6s
OK Cesaroni H237 3.65lb 82ft/s 369ft/s 16.0G 1,110ft 7.7s 7s
OK AeroTech H220 3.55lb 89ft/s 367ft/s 18.4G 1,124ft 7.7s 7s
OK Cesaroni H151 3.52lb 75ft/s 344ft/s 12.0G 1,139ft 7.9s 6s
OK AeroTech H210 3.54lb 85ft/s 372ft/s 15.2G 1,144ft 7.8s 7s
OK KBA H130 4.56lb 63ft/s 304ft/s 9.8G 1,162ft 8.3s 6s
OK Cesaroni H135 3.55lb 68ft/s 347ft/s 9.5G 1,195ft 8.2s 6s
OK Cesaroni H170 3.51lb 80ft/s 366ft/s 14.2G 1,196ft 7.9s 7s
OK Cesaroni H160 3.60lb 69ft/s 366ft/s 10.6G 1,198ft 8.1s 7s
OK AeroTech H182 3.46lb 72ft/s 382ft/s 11.2G 1,202ft 8.0s 7s
OK AeroTech H180 3.56lb 81ft/s 385ft/s 15.1G 1,240ft 8.0s 7s
OK AeroTech H250 3.56lb 99ft/s 409ft/s 19.3G 1,257ft 8.0s 7s
OK AeroTech H135 3.47lb 67ft/s 350ft/s 9.0G 1,282ft 8.5s 6s
OK KBA H225 3.70lb 74ft/s 415ft/s 15.0G 1,298ft 8.2s 7s
OK AeroTech H195 3.43lb 86ft/s 416ft/s 15.6G 1,313ft 8.1s 7s
OK Cesaroni H295 3.75lb 99ft/s 441ft/s 20.0G 1,332ft 8.1s 7s
OK Cesaroni H180 3.69lb 82ft/s 410ft/s 15.5G 1,385ft 8.4s 7s
OK Cesaroni H194 3.63lb 83ft/s 418ft/s 16.5G 1,387ft 8.4s 7s
OK Cesaroni H200 3.60lb 85ft/s 424ft/s 17.1G 1,413ft 8.4s 7s
OK Cesaroni H255 3.51lb 99ft/s 470ft/s 23.1G 1,467ft 8.3s 7s
OK Cesaroni H140 3.61lb 79ft/s 397ft/s 14.3G 1,469ft 8.7s 7s
OK Cesaroni H340 3.86lb 110ft/s 489ft/s 24.9G 1,475ft 8.4s 7s
OK Cesaroni H399 3.65lb 118ft/s 508ft/s 32.6G 1,482ft 8.3s 8s
OK Cesaroni H226 3.79lb 90ft/s 471ft/s 19.7G 1,593ft 8.7s 7s
OK Cesaroni H159 3.76lb 72ft/s 437ft/s 10.1G 1,594ft 9.1s 7s
OK AeroTech H268 3.79lb 97ft/s 495ft/s 18.5G 1,601ft 8.7s 8s
OK Cesaroni H233 3.72lb 91ft/s 490ft/s 19.5G 1,630ft 8.8s 7s
OK Cesaroni H255 3.70lb 103ft/s 510ft/s 24.1G 1,651ft 8.7s 7s
OK Cesaroni H160 3.70lb 91ft/s 441ft/s 18.2G 1,669ft 9.0s 7s
OK AeroTech I200 3.79lb 90ft/s 476ft/s 17.0G 1,694ft 9.0s 7s
OK Cesaroni I204 3.77lb 96ft/s 502ft/s 20.3G 1,788ft 9.1s 7s
OK AeroTech I205 3.69lb 84ft/s 512ft/s 21.1G 1,796ft 9.1s 7s
OK RATT I80 4.22lb 48ft/s 348ft/s 5.4G 1,808ft 10.7s 6s
OK Cesaroni I224 3.82lb 102ft/s 545ft/s 24.5G 1,915ft 9.3s 8s
OK Cesaroni I243 3.88lb 98ft/s 544ft/s 24.3G 1,919ft 9.3s 8s
OK KBA J520 4.59lb 119ft/s 844ft/s 33.9G 2,664ft 10.3s 9s
warningsW,D Estes G80 3.28lb 5:1 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 (14ft/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 (19ft/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 (31ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (28ft/s)
failedG Estes F15 speed at end of launch guide too slow (9ft/s)
failedG AeroTech F37 speed at end of launch guide too slow (33ft/s)
failedG AeroTech F62 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (32ft/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 (27ft/s)
failedG AeroTech F42 speed at end of launch guide too slow (42ft/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)
failedA Cesaroni F120 rocket doesn't reach a safe altitude (186ft)
failedG Cesaroni F59 speed at end of launch guide too slow (44ft/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 (46ft/s)
failedG Apogee F10 speed at end of launch guide too slow (13ft/s)
failedG AeroTech F50 speed at end of launch guide too slow (45ft/s)
failedG AeroTech F25 speed at end of launch guide too slow (37ft/s)
failedG AeroTech F40 speed at end of launch guide too slow (41ft/s)
failedG AeroTech G54 speed at end of launch guide too slow (47ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (34ft/s)
failedG AeroTech G53 speed at end of launch guide too slow (48ft/s)
failedG Estes G40 speed at end of launch guide too slow (43ft/s)
failedG AeroTech G77 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni G57 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni G68 speed at end of launch guide too slow (45ft/s)
failedG AeroTech G79 speed at end of launch guide too slow (46ft/s)
failedG AeroTech G40 speed at end of launch guide too slow (43ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (30ft/s)
failedG AeroTech G75 speed at end of launch guide too slow (44ft/s)
failedG KBA G82 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni H42 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni H53 speed at end of launch guide too slow (44ft/s)

G These simulations were run with a launch guide length of 8ft (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.

A The minimum altitude check is used to ensure that the rocket flies high enough to ensure time for a safe recovery. In addition, many barometric altimeters require a minimum altitude to detect lift-off. (The minimum altitude is 10m or 33ft for an A motor and doubles for each impulse class).

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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