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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 50 motors that fit and appear to have enough thrust (717 motors didn't fit, 24 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:   Mega Der Red Max
Owner: Steve Rea
Body Diameter: 4.00in
Dry Weight: 29.0oz
MMT Diameter: 29.0mm
MMT Length: 8.00in
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 32.7oz 71ft/s 179ft/s 14.5G 358ft 4.6s 4s
OK AeroTech F42 31.7oz 48ft/s 148ft/s 6.8G 362ft 4.9s 3s
OK Cesaroni F59 32.5oz 49ft/s 164ft/s 6.8G 365ft 4.9s 4s
OK AeroTech F50 32.0oz 51ft/s 189ft/s 7.2G 476ft 5.4s 4s
OK AeroTech F52 33.3oz 52ft/s 188ft/s 7.5G 496ft 5.6s 4s
warningsW Estes F50 31.9oz 53ft/s 206ft/s 7.7G 548ft 5.8s 4s
OK AeroTech G54 33.8oz 52ft/s 204ft/s 7.6G 557ft 5.9s 4s
OK Cesaroni G88 34.4oz 57ft/s 237ft/s 11.2G 578ft 5.8s 5s
OK AeroTech G104 33.8oz 66ft/s 241ft/s 12.0G 594ft 5.8s 5s
OK AeroTech G74 32.1oz 57ft/s 247ft/s 8.9G 612ft 6.0s 5s
OK AeroTech G53 34.1oz 54ft/s 216ft/s 8.1G 645ft 6.3s 4s
OK Cesaroni G80 34.1oz 54ft/s 260ft/s 9.4G 662ft 6.2s 5s
OK AeroTech G77 34.8oz 50ft/s 267ft/s 8.0G 710ft 6.4s 5s
warningsW Estes G40 33.3oz 49ft/s 221ft/s 6.9G 717ft 6.6s 4s
OK AeroTech G40 33.3oz 49ft/s 221ft/s 6.9G 717ft 6.6s 4s
OK AeroTech G77 33.3oz 54ft/s 279ft/s 9.1G 727ft 6.4s 5s
OK AeroTech G79 34.5oz 56ft/s 276ft/s 9.1G 753ft 6.5s 5s
OK Cesaroni G83 34.1oz 59ft/s 280ft/s 9.6G 757ft 6.5s 5s
OK Cesaroni G250 34.0oz 95ft/s 346ft/s 28.8G 763ft 6.1s 6s
OK AeroTech G79 33.4oz 49ft/s 267ft/s 7.5G 764ft 6.7s 5s
OK Cesaroni G68 34.5oz 49ft/s 264ft/s 8.6G 765ft 6.6s 5s
OK Cesaroni G57 34.1oz 54ft/s 249ft/s 8.3G 776ft 6.8s 5s
OK Cesaroni G126 34.1oz 72ft/s 327ft/s 15.8G 814ft 6.4s 5s
OK AeroTech G76 34.2oz 72ft/s 271ft/s 14.9G 820ft 6.6s 5s
OK AeroTech G64 34.3oz 61ft/s 266ft/s 10.3G 847ft 6.8s 4s
OK Cesaroni G131 36.1oz 67ft/s 339ft/s 13.7G 854ft 6.6s 5s
OK AeroTech G75 33.6oz 57ft/s 291ft/s 9.8G 857ft 6.8s 5s
OK AeroTech G78 33.4oz 58ft/s 311ft/s 9.8G 869ft 6.8s 5s
OK AeroTech G125 33.4oz 70ft/s 357ft/s 14.5G 878ft 6.6s 6s
OK AeroTech G80 33.5oz 62ft/s 320ft/s 10.2G 917ft 6.9s 5s
OK Cesaroni G106 35.6oz 59ft/s 355ft/s 12.3G 944ft 7.0s 6s
OK KBA G135 37.0oz 65ft/s 377ft/s 13.4G 965ft 6.9s 6s
OK KBA G82 37.1oz 49ft/s 326ft/s 7.9G 978ft 7.3s 5s
OK AeroTech H165 36.1oz 79ft/s 421ft/s 17.6G 1,059ft 7.0s 6s
OK Cesaroni H410 35.4oz 128ft/s 505ft/s 50.6G 1,061ft 6.7s 6s
OK Cesaroni G125 35.9oz 71ft/s 398ft/s 15.2G 1,068ft 7.2s 6s
OK Cesaroni G118 35.6oz 65ft/s 394ft/s 14.8G 1,074ft 7.2s 6s
OK Cesaroni H133 35.7oz 73ft/s 406ft/s 18.3G 1,091ft 7.2s 6s
OK Cesaroni H163 35.6oz 77ft/s 439ft/s 20.9G 1,100ft 7.1s 6s
OK AeroTech G138 34.2oz 70ft/s 455ft/s 15.5G 1,110ft 7.1s 6s
OK AeroTech H238 35.9oz 91ft/s 458ft/s 21.9G 1,119ft 7.0s 6s
OK AeroTech H128 36.3oz 77ft/s 425ft/s 16.7G 1,125ft 7.2s 6s
OK Cesaroni H90 34.7oz 65ft/s 373ft/s 15.1G 1,133ft 7.4s 6s
OK Cesaroni G54 35.8oz 65ft/s 289ft/s 11.1G 1,138ft 7.9s 5s
OK Cesaroni H87 36.2oz 59ft/s 367ft/s 11.7G 1,148ft 7.6s 6s
OK AeroTech H115 36.2oz 65ft/s 412ft/s 11.1G 1,178ft 7.5s 6s
OK Cesaroni H54 36.4oz 56ft/s 295ft/s 9.0G 1,192ft 8.2s 5s
OK AeroTech H182 36.3oz 75ft/s 532ft/s 17.2G 1,334ft 7.5s 6s
OK AeroTech H195 35.9oz 97ft/s 569ft/s 24.4G 1,408ft 7.5s 6s
warningsW,D Estes G80 33.4oz 8:1 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 (24ft/s)
failedG AeroTech E23 speed at end of launch guide too slow (35ft/s)
failedG AeroTech E16 speed at end of launch guide too slow (28ft/s)
failedG AeroTech F23 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (36ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (34ft/s)
failedG Estes F15 speed at end of launch guide too slow (21ft/s)
failedG AeroTech F37 speed at end of launch guide too slow (36ft/s)
failedG AeroTech F62 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (37ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni F29 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni F31 speed at end of launch guide too slow (34ft/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 (33ft/s)
failedG AeroTech F22 speed at end of launch guide too slow (29ft/s)
failedG Apogee F10 speed at end of launch guide too slow (24ft/s)
failedG AeroTech F25 speed at end of launch guide too slow (43ft/s)
failedG AeroTech F40 speed at end of launch guide too slow (47ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (40ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (35ft/s)
failedG AeroTech G75 speed at end of launch guide too slow (48ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (33ft/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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