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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 91 motors that fit and appear to have enough thrust (679 motors didn't fit, 21 motors failed safety checks). 110 motor had thrust curves available and 217 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:   BAR Crayon
Owner: Robert Belknap
Body Diameter: 4.00in
Dry Weight: 24.0oz
MMT Diameter: 29.0mm
MMT Length: 16.00in
CD: 0.60

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 27.8oz 51ft/s 182ft/s 7.2G 431ft 5.2s 4s
OK Cesaroni F120 27.7oz 76ft/s 214ft/s 17.3G 457ft 5.1s 5s
OK AeroTech F42 26.7oz 54ft/s 180ft/s 8.3G 470ft 5.4s 4s
OK Cesaroni F59 27.5oz 54ft/s 198ft/s 8.2G 470ft 5.4s 4s
OK AeroTech F50 27.0oz 56ft/s 227ft/s 8.7G 601ft 5.9s 4s
OK AeroTech F25 27.2oz 49ft/s 185ft/s 6.6G 620ft 6.4s 4s
OK AeroTech F52 28.3oz 57ft/s 225ft/s 9.0G 623ft 6.1s 5s
OK AeroTech F40 28.5oz 52ft/s 214ft/s 7.6G 671ft 6.4s 4s
warningsW Estes F50 26.9oz 59ft/s 247ft/s 9.3G 683ft 6.2s 5s
OK AeroTech G54 28.8oz 57ft/s 242ft/s 9.0G 692ft 6.3s 5s
OK Cesaroni G88 29.4oz 62ft/s 281ft/s 13.3G 711ft 6.2s 5s
OK AeroTech G104 28.8oz 72ft/s 284ft/s 14.2G 728ft 6.2s 5s
OK AeroTech G74 27.1oz 63ft/s 295ft/s 10.8G 753ft 6.4s 5s
OK AeroTech G53 29.1oz 59ft/s 256ft/s 9.7G 791ft 6.7s 5s
OK Cesaroni G80 29.1oz 58ft/s 307ft/s 11.2G 808ft 6.6s 5s
OK AeroTech G77 29.8oz 54ft/s 315ft/s 9.4G 863ft 6.9s 6s
warningsW Estes G40 28.3oz 54ft/s 262ft/s 8.3G 877ft 7.1s 5s
OK AeroTech G40 28.3oz 54ft/s 262ft/s 8.3G 877ft 7.1s 5s
OK AeroTech G77 28.3oz 59ft/s 331ft/s 10.8G 879ft 6.8s 6s
OK AeroTech G79 29.5oz 60ft/s 324ft/s 10.8G 909ft 6.9s 5s
OK Cesaroni G250 29.0oz 103ft/s 407ft/s 34.0G 910ft 6.5s 6s
OK Cesaroni G83 29.1oz 64ft/s 330ft/s 11.4G 913ft 6.9s 6s
OK AeroTech G79 28.4oz 52ft/s 316ft/s 8.9G 924ft 7.1s 5s
OK Cesaroni G68 29.5oz 54ft/s 311ft/s 10.2G 926ft 7.1s 5s
OK Cesaroni G57 29.1oz 59ft/s 294ft/s 9.9G 941ft 7.2s 5s
OK Cesaroni G126 29.1oz 80ft/s 384ft/s 18.6G 971ft 6.8s 6s
OK AeroTech G76 29.2oz 81ft/s 317ft/s 17.6G 983ft 7.0s 5s
OK Cesaroni G131 31.1oz 74ft/s 396ft/s 16.1G 1,015ft 7.0s 6s
OK AeroTech G64 29.3oz 69ft/s 312ft/s 12.3G 1,017ft 7.2s 5s
OK AeroTech G75 28.6oz 62ft/s 342ft/s 11.7G 1,025ft 7.2s 5s
OK AeroTech G78 28.4oz 63ft/s 366ft/s 11.6G 1,037ft 7.2s 6s
OK AeroTech G125 28.4oz 78ft/s 420ft/s 17.1G 1,040ft 6.9s 6s
OK AeroTech G80 28.5oz 66ft/s 375ft/s 12.1G 1,090ft 7.3s 6s
OK Cesaroni G106 30.6oz 62ft/s 414ft/s 14.4G 1,119ft 7.4s 6s
OK KBA G135 32.0oz 68ft/s 439ft/s 15.7G 1,139ft 7.3s 6s
OK KBA G82 32.1oz 53ft/s 379ft/s 9.3G 1,161ft 7.7s 6s
OK AeroTech G75 32.2oz 52ft/s 370ft/s 7.6G 1,230ft 8.1s 6s
OK Cesaroni H410 30.4oz 137ft/s 588ft/s 59.2G 1,232ft 7.1s 7s
OK AeroTech H165 31.1oz 86ft/s 489ft/s 20.6G 1,238ft 7.4s 6s
OK Cesaroni G125 30.9oz 76ft/s 462ft/s 17.8G 1,252ft 7.5s 6s
OK Cesaroni H175 32.7oz 86ft/s 505ft/s 22.3G 1,253ft 7.4s 6s
OK Cesaroni G118 30.6oz 72ft/s 458ft/s 17.3G 1,260ft 7.6s 6s
OK Cesaroni H133 30.7oz 80ft/s 471ft/s 21.5G 1,276ft 7.6s 6s
OK Cesaroni H163 30.6oz 85ft/s 510ft/s 24.5G 1,283ft 7.5s 6s
OK AeroTech G138 29.2oz 73ft/s 531ft/s 18.1G 1,294ft 7.5s 6s
OK AeroTech H238 30.9oz 99ft/s 531ft/s 25.6G 1,302ft 7.4s 6s
OK AeroTech H128 31.3oz 83ft/s 493ft/s 19.6G 1,312ft 7.6s 6s
OK Cesaroni H90 29.7oz 73ft/s 433ft/s 17.8G 1,327ft 7.8s 6s
OK Cesaroni G54 30.8oz 69ft/s 336ft/s 13.1G 1,345ft 8.3s 5s
OK Cesaroni H87 31.2oz 62ft/s 425ft/s 13.8G 1,347ft 8.0s 6s
OK Cesaroni H123 32.0oz 70ft/s 487ft/s 14.7G 1,347ft 7.8s 6s
OK AeroTech H115 31.2oz 68ft/s 477ft/s 13.0G 1,372ft 7.8s 6s
OK Cesaroni H54 31.4oz 61ft/s 342ft/s 10.6G 1,408ft 8.6s 5s
OK Cesaroni H118 32.2oz 75ft/s 479ft/s 18.0G 1,419ft 7.9s 6s
OK AeroTech H97 33.8oz 61ft/s 451ft/s 10.5G 1,432ft 8.3s 6s
OK Cesaroni H237 34.4oz 93ft/s 603ft/s 27.2G 1,440ft 7.7s 7s
OK AeroTech H220 32.8oz 104ft/s 597ft/s 32.6G 1,457ft 7.7s 7s
OK AeroTech H210 32.7oz 96ft/s 601ft/s 25.8G 1,480ft 7.8s 7s
OK Cesaroni H151 32.4oz 85ft/s 544ft/s 21.6G 1,503ft 7.9s 7s
OK AeroTech H182 31.3oz 82ft/s 614ft/s 20.1G 1,535ft 7.9s 7s
OK Cesaroni H170 32.2oz 95ft/s 585ft/s 25.5G 1,542ft 7.9s 7s
OK Cesaroni H160 33.6oz 85ft/s 579ft/s 18.9G 1,558ft 8.1s 7s
OK AeroTech H250 33.0oz 116ft/s 650ft/s 34.0G 1,566ft 7.8s 7s
OK AeroTech H180 32.9oz 96ft/s 609ft/s 26.4G 1,571ft 7.9s 7s
OK Cesaroni H135 32.9oz 78ft/s 540ft/s 17.1G 1,575ft 8.2s 6s
OK AeroTech H195 30.9oz 105ft/s 655ft/s 28.6G 1,612ft 7.8s 7s
OK Cesaroni H295 36.1oz 114ft/s 702ft/s 34.1G 1,621ft 7.9s 7s
OK KBA H130 49.0oz 68ft/s 444ft/s 15.1G 1,624ft 9.0s 7s
OK KBA H225 35.1oz 84ft/s 657ft/s 24.6G 1,630ft 8.1s 7s
OK AeroTech H135 31.5oz 73ft/s 536ft/s 16.4G 1,679ft 8.4s 6s
OK Cesaroni H194 34.0oz 98ft/s 640ft/s 28.9G 1,708ft 8.1s 7s
OK Cesaroni H180 35.1oz 93ft/s 628ft/s 26.8G 1,718ft 8.2s 7s
OK Cesaroni H399 34.4oz 137ft/s 807ft/s 56.2G 1,727ft 7.9s 7s
OK Cesaroni H200 33.7oz 103ft/s 650ft/s 30.0G 1,730ft 8.1s 7s
OK Cesaroni H340 37.8oz 120ft/s 759ft/s 41.4G 1,736ft 8.0s 7s
OK Cesaroni H255 32.2oz 116ft/s 731ft/s 41.1G 1,745ft 8.0s 7s
OK Cesaroni H140 33.8oz 94ft/s 590ft/s 25.2G 1,831ft 8.5s 6s
OK Cesaroni H53 34.1oz 51ft/s 396ft/s 8.9G 1,840ft 9.8s 5s
OK AeroTech H268 36.6oz 108ft/s 742ft/s 31.3G 1,882ft 8.4s 7s
OK Cesaroni H226 36.7oz 109ft/s 709ft/s 33.4G 1,888ft 8.4s 7s
OK Cesaroni H233 35.6oz 101ft/s 731ft/s 33.4G 1,911ft 8.3s 7s
OK Cesaroni H255 35.2oz 114ft/s 765ft/s 41.2G 1,918ft 8.3s 7s
OK Cesaroni H159 36.1oz 80ft/s 632ft/s 17.5G 1,941ft 8.8s 7s
OK AeroTech I200 36.6oz 103ft/s 693ft/s 28.8G 1,995ft 8.6s 7s
OK Cesaroni H160 35.3oz 107ft/s 642ft/s 31.3G 2,006ft 8.7s 6s
OK AeroTech I205 35.1oz 99ft/s 740ft/s 36.3G 2,068ft 8.6s 7s
OK Cesaroni I204 36.3oz 109ft/s 725ft/s 34.5G 2,068ft 8.6s 7s
OK Cesaroni I224 37.1oz 119ft/s 786ft/s 41.1G 2,183ft 8.7s 7s
OK Cesaroni I243 38.1oz 107ft/s 772ft/s 40.3G 2,183ft 8.7s 7s
OK KBA J520 49.5oz 129ft/s 1,146ft/s 50.9G 2,867ft 9.6s 8s
warningsW,D Estes G80 28.4oz 10:1 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 (28ft/s)
failedG AeroTech E23 speed at end of launch guide too slow (39ft/s)
failedG AeroTech E16 speed at end of launch guide too slow (32ft/s)
failedG AeroTech F23 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (40ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (38ft/s)
failedG Estes F15 speed at end of launch guide too slow (25ft/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 (41ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni F29 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni F31 speed at end of launch guide too slow (38ft/s)
failed5 Estes F26 average thrust fails 5:1 thrust/weight ratio (4:1)
failedG AeroTech F26 speed at end of launch guide too slow (37ft/s)
failedG AeroTech F22 speed at end of launch guide too slow (32ft/s)
failedG Apogee F10 speed at end of launch guide too slow (29ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (44ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni H42 speed at end of launch guide too slow (44ft/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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