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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 95 motors that fit and appear to have enough thrust (656 motors didn't fit, 40 motors failed safety checks). 135 motor had thrust curves available and 283 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:   4inch Crayon-38mm MMT
Owner: Kenneth B Weaver
Body Diameter: 4.00in
Dry Weight: 6.00lb
MMT Diameter: 38.0mm
MMT Length: 18.00in
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 Contrail G123 7.13lb 49ft/s 109ft/s 10.2G 247ft 4.3s 3s
OK Cesaroni G185 6.42lb 53ft/s 122ft/s 6.2G 248ft 4.2s 4s
OK Contrail H222 7.15lb 71ft/s 138ft/s 20.3G 330ft 4.7s 4s
warningsW AeroTech H283 6.54lb 70ft/s 195ft/s 10.5G 562ft 6.0s 5s
OK AeroTech H148 6.68lb 51ft/s 181ft/s 5.5G 579ft 6.5s 5s
OK AeroTech H130 6.52lb 61ft/s 177ft/s 7.9G 594ft 6.4s 5s
OK AeroTech H669 6.56lb 111ft/s 233ft/s 36.9G 683ft 6.4s 6s
OK Loki H125 6.75lb 51ft/s 189ft/s 5.8G 693ft 7.0s 5s
OK Loki H144 6.74lb 59ft/s 199ft/s 7.3G 703ft 6.9s 5s
OK AeroTech H219 6.58lb 65ft/s 222ft/s 9.0G 724ft 6.9s 6s
OK AeroTech H242 6.58lb 58ft/s 222ft/s 7.1G 760ft 7.1s 6s
OK Loki H160 6.74lb 63ft/s 219ft/s 8.6G 790ft 7.2s 6s
OK Cesaroni H400 6.63lb 79ft/s 259ft/s 14.0G 835ft 7.1s 6s
OK Cesaroni H152 6.66lb 49ft/s 236ft/s 6.2G 897ft 7.9s 6s
OK AeroTech H178 6.71lb 48ft/s 250ft/s 6.2G 926ft 8.0s 6s
OK Cesaroni H225 6.43lb 59ft/s 264ft/s 8.0G 935ft 7.7s 7s
OK AeroTech H170 6.73lb 51ft/s 268ft/s 5.8G 1,085ft 8.5s 6s
OK AeroTech I218 6.82lb 64ft/s 281ft/s 8.4G 1,090ft 8.3s 7s
OK AeroTech H550 6.71lb 99ft/s 318ft/s 20.7G 1,118ft 8.0s 7s
OK AeroTech H550 6.70lb 100ft/s 320ft/s 20.8G 1,125ft 8.0s 7s
OK AeroTech I180 6.85lb 71ft/s 268ft/s 10.9G 1,128ft 8.4s 6s
warningsW Cesaroni H565 6.80lb 97ft/s 324ft/s 20.2G 1,137ft 8.1s 7s
OK AeroTech I161 6.81lb 53ft/s 269ft/s 6.2G 1,143ft 8.7s 6s
OK AeroTech H999 6.73lb 133ft/s 336ft/s 52.7G 1,157ft 8.0s 8s
OK AeroTech I140 6.78lb 48ft/s 263ft/s 5.0G 1,166ft 9.0s 7s
OK Cesaroni I180 6.87lb 48ft/s 288ft/s 5.9G 1,167ft 8.8s 7s
OK AeroTech I225 7.07lb 54ft/s 304ft/s 7.8G 1,253ft 8.9s 7s
OK AeroTech I245 6.80lb 77ft/s 310ft/s 12.7G 1,264ft 8.7s 7s
OK Cesaroni I212 7.05lb 52ft/s 312ft/s 7.1G 1,273ft 9.0s 7s
OK AeroTech I357 6.76lb 74ft/s 321ft/s 11.6G 1,275ft 8.7s 7s
OK Cesaroni I566 6.85lb 90ft/s 372ft/s 19.3G 1,373ft 8.8s 8s
OK Cesaroni I195 6.92lb 56ft/s 329ft/s 6.7G 1,441ft 9.6s 8s
OK Cesaroni I345 6.87lb 74ft/s 373ft/s 11.8G 1,492ft 9.3s 8s
OK Cesaroni I170 6.86lb 54ft/s 336ft/s 6.4G 1,494ft 9.8s 7s
OK Cesaroni I175 6.96lb 50ft/s 330ft/s 5.2G 1,496ft 9.9s 7s
OK AeroTech I285 7.09lb 70ft/s 363ft/s 11.0G 1,518ft 9.5s 8s
OK Cesaroni I236 6.88lb 62ft/s 357ft/s 9.2G 1,551ft 9.7s 8s
OK Cesaroni I800 7.01lb 108ft/s 418ft/s 27.6G 1,562ft 9.2s 9s
OK Cesaroni I223 7.09lb 55ft/s 364ft/s 7.1G 1,605ft 9.9s 8s
OK AeroTech I211 7.00lb 64ft/s 351ft/s 9.3G 1,608ft 9.9s 8s
OK AeroTech I1299 6.93lb 151ft/s 437ft/s 48.3G 1,612ft 9.2s 9s
OK AeroTech I305 7.28lb 72ft/s 376ft/s 11.7G 1,622ft 9.7s 8s
OK AeroTech I195 7.26lb 67ft/s 351ft/s 10.2G 1,628ft 9.9s 8s
OK AeroTech I300 6.97lb 76ft/s 382ft/s 14.0G 1,642ft 9.7s 8s
OK Loki I316 7.19lb 86ft/s 402ft/s 14.7G 1,776ft 9.9s 8s
OK Cesaroni I287 7.33lb 64ft/s 413ft/s 9.5G 1,821ft 10.3s 9s
OK Loki I210 7.19lb 71ft/s 381ft/s 12.8G 1,854ft 10.3s 8s
OK Loki I405 7.20lb 104ft/s 438ft/s 24.1G 1,889ft 10.0s 9s
OK Cesaroni I285 7.12lb 67ft/s 429ft/s 10.1G 1,944ft 10.6s 9s
OK Cesaroni I255 7.14lb 63ft/s 425ft/s 9.0G 1,972ft 10.7s 9s
OK Loki I377 7.23lb 93ft/s 446ft/s 19.4G 1,993ft 10.4s 9s
OK Loki I430 7.19lb 83ft/s 472ft/s 15.6G 1,995ft 10.4s 9s
OK AeroTech I327 7.38lb 73ft/s 455ft/s 12.2G 2,040ft 10.6s 9s
OK AMW I297 7.30lb 68ft/s 449ft/s 10.5G 2,045ft 10.7s 9s
OK AeroTech I366 7.22lb 82ft/s 463ft/s 14.2G 2,047ft 10.5s 9s
OK AeroTech I364 7.49lb 71ft/s 455ft/s 11.5G 2,059ft 10.7s 9s
OK Cesaroni I470 7.09lb 86ft/s 495ft/s 16.7G 2,076ft 10.5s 9s
OK Cesaroni I303 7.10lb 72ft/s 454ft/s 12.1G 2,079ft 10.8s 9s
OK Cesaroni I242 7.21lb 61ft/s 439ft/s 7.9G 2,104ft 11.1s 9s
OK AeroTech I280 7.36lb 67ft/s 456ft/s 9.3G 2,113ft 11.0s 9s
OK Cesaroni I125 7.43lb 51ft/s 349ft/s 7.1G 2,135ft 12.0s 7s
OK KBA I301 7.60lb 67ft/s 485ft/s 11.1G 2,197ft 10.9s 9s
OK AeroTech I435 7.14lb 100ft/s 505ft/s 22.8G 2,199ft 10.7s 9s
OK KBA I550 7.57lb 90ft/s 552ft/s 19.4G 2,204ft 10.6s 10s
OK Cesaroni I350 7.72lb 71ft/s 486ft/s 10.7G 2,220ft 11.1s 9s
OK AeroTech I284 7.22lb 80ft/s 484ft/s 14.1G 2,252ft 11.0s 9s
OK AeroTech I500 7.27lb 89ft/s 546ft/s 16.8G 2,377ft 11.0s 10s
warningsW Cesaroni I540 7.32lb 92ft/s 568ft/s 18.4G 2,415ft 11.0s 10s
OK AeroTech I600 7.33lb 104ft/s 566ft/s 24.1G 2,427ft 11.0s 10s
OK Loki J396 7.66lb 74ft/s 534ft/s 14.9G 2,427ft 11.3s 10s
OK Cesaroni I216 7.32lb 63ft/s 465ft/s 9.4G 2,447ft 11.8s 9s
OK AeroTech I350 7.36lb 77ft/s 547ft/s 13.9G 2,454ft 11.3s 10s
OK AeroTech J420 7.43lb 85ft/s 544ft/s 15.9G 2,457ft 11.3s 10s
OK Cesaroni J335 7.38lb 75ft/s 526ft/s 11.5G 2,465ft 11.5s 9s
OK KBA J740 7.60lb 111ft/s 598ft/s 26.5G 2,475ft 11.1s 10s
OK Cesaroni J381 7.52lb 82ft/s 538ft/s 14.1G 2,477ft 11.4s 10s
OK AeroTech J350 7.47lb 98ft/s 546ft/s 23.8G 2,480ft 11.2s 10s
OK Cesaroni J285 7.31lb 70ft/s 511ft/s 10.2G 2,489ft 11.7s 9s
OK AeroTech J340 7.27lb 82ft/s 535ft/s 17.6G 2,491ft 11.4s 9s
OK Cesaroni J270 7.44lb 61ft/s 506ft/s 8.0G 2,491ft 11.8s 9s
OK Cesaroni J316 7.34lb 73ft/s 517ft/s 12.4G 2,506ft 11.6s 9s
OK Cesaroni J357 7.32lb 77ft/s 545ft/s 14.8G 2,515ft 11.5s 10s
OK AeroTech J425 7.39lb 72ft/s 579ft/s 12.6G 2,579ft 11.6s 10s
OK Cesaroni J290 7.45lb 70ft/s 527ft/s 10.8G 2,608ft 11.9s 9s
OK Cesaroni J400 7.55lb 78ft/s 569ft/s 13.2G 2,629ft 11.6s 10s
OK AeroTech J270 7.42lb 66ft/s 529ft/s 9.9G 2,681ft 12.0s 9s
OK AeroTech J500 7.44lb 102ft/s 607ft/s 22.9G 2,718ft 11.5s 10s
OK Loki J528 7.64lb 108ft/s 629ft/s 29.0G 2,752ft 11.5s 10s
OK Cesaroni J330 7.55lb 76ft/s 585ft/s 12.7G 2,882ft 12.2s 10s
OK Cesaroni J410 7.62lb 83ft/s 614ft/s 14.0G 2,891ft 12.1s 10s
OK AeroTech J435 7.38lb 94ft/s 633ft/s 20.0G 2,906ft 11.9s 10s
OK Cesaroni J425 7.54lb 89ft/s 624ft/s 19.0G 2,920ft 12.0s 10s
OK Loki J712 7.66lb 103ft/s 681ft/s 24.8G 2,932ft 11.8s 11s
OK Loki J320 7.66lb 76ft/s 594ft/s 14.5G 3,027ft 12.5s 10s
OK Cesaroni J354 7.72lb 79ft/s 603ft/s 14.2G 3,042ft 12.4s 10s

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

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
failedA Contrail G130 rocket doesn't reach a safe altitude (134ft)
failedA AeroTech G339 rocket doesn't reach a safe altitude (212ft)
failedG AeroTech G67 speed at end of launch guide too slow (32ft/s)
failedG Loki G69 speed at end of launch guide too slow (33ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (29ft/s)
failedA Contrail G234 rocket doesn't reach a safe altitude (189ft)
failedG Loki G70 speed at end of launch guide too slow (34ft/s)
failedG Loki G94 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (29ft/s)
failedG Loki G80 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni G46 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (29ft/s)
failedG Loki G66 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (30ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (23ft/s)
failedG Cesaroni G115 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (32ft/s)
failedG Contrail G100 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (21ft/s)
failedA Contrail G300 rocket doesn't reach a safe altitude (142ft)
failedG AeroTech H73 speed at end of launch guide too slow (28ft/s)
failedG Loki H100 speed at end of launch guide too slow (41ft/s)
failedG AeroTech H123 speed at end of launch guide too slow (43ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (40ft/s)
failedG Loki H90 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (43ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (37ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (30ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (43ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (21ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (24ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (43ft/s)
failedG Loki I110 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni J94 speed at end of launch guide too slow (40ft/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.)

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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