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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 130 motors that fit and appear to have enough thrust (623 motors didn't fit, 38 motors failed safety checks). 168 motor had thrust curves available and 344 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:   Dark Star Jr
Owner: Wayne Comfort
Body Diameter: 2.30in
Dry Weight: 4.65lb
MMT Diameter: 38.0mm
MMT Length: 32.00in
CD: 0.70

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 G234 5.85lb 85ft/s 131ft/s 19.9G 300ft 4.4s 4s
OK AeroTech G339 5.05lb 78ft/s 150ft/s 15.8G 359ft 4.9s 4s
OK Contrail G123 5.78lb 51ft/s 143ft/s 12.9G 405ft 5.4s 4s
OK Contrail G100 5.78lb 48ft/s 140ft/s 6.1G 418ft 5.5s 4s
OK Cesaroni G185 5.07lb 52ft/s 161ft/s 8.2G 429ft 5.5s 5s
OK Contrail H300 6.00lb 91ft/s 177ft/s 25.9G 529ft 5.8s 5s
OK Contrail H222 5.80lb 74ft/s 176ft/s 25.3G 533ft 5.9s 5s
OK Contrail H303 5.95lb 98ft/s 190ft/s 28.4G 600ft 6.2s 6s
OK Contrail H211 5.97lb 81ft/s 220ft/s 22.7G 828ft 7.3s 6s
OK Contrail H121 6.00lb 50ft/s 218ft/s 9.0G 913ft 8.1s 6s
OK Contrail H246 5.97lb 77ft/s 241ft/s 19.0G 944ft 7.8s 7s
warningsW AeroTech H283 5.19lb 71ft/s 255ft/s 13.6G 982ft 7.9s 7s
OK AeroTech H148 5.33lb 52ft/s 244ft/s 7.2G 1,018ft 8.4s 7s
OK AeroTech H130 5.17lb 61ft/s 242ft/s 10.3G 1,050ft 8.4s 7s
OK Contrail H141 6.00lb 59ft/s 243ft/s 8.9G 1,054ft 8.5s 7s
OK Contrail H248 6.40lb 77ft/s 263ft/s 23.3G 1,133ft 8.5s 7s
OK AeroTech H669 5.21lb 111ft/s 299ft/s 46.8G 1,203ft 8.5s 8s
OK Loki H125 5.40lb 53ft/s 259ft/s 7.5G 1,221ft 9.2s 7s
OK Loki H144 5.39lb 60ft/s 269ft/s 9.4G 1,235ft 9.1s 7s
OK AeroTech H219 5.23lb 67ft/s 294ft/s 11.6G 1,290ft 9.1s 8s
OK AeroTech H242 5.23lb 58ft/s 297ft/s 9.3G 1,360ft 9.5s 8s
OK Loki H160 5.39lb 64ft/s 293ft/s 11.0G 1,395ft 9.5s 8s
OK Contrail H277 6.22lb 87ft/s 304ft/s 26.4G 1,444ft 9.6s 8s
OK Contrail H340 6.45lb 88ft/s 312ft/s 30.3G 1,472ft 9.6s 9s
OK Cesaroni H400 5.28lb 76ft/s 335ft/s 18.1G 1,495ft 9.6s 9s
OK Cesaroni H152 5.31lb 49ft/s 321ft/s 8.0G 1,622ft 10.5s 9s
OK AeroTech H178 5.36lb 49ft/s 336ft/s 8.2G 1,679ft 10.6s 9s
OK Cesaroni H225 5.08lb 62ft/s 353ft/s 10.4G 1,717ft 10.5s 9s
OK Contrail I500 6.41lb 113ft/s 356ft/s 34.7G 1,759ft 10.3s 10s
OK AeroTech I218 5.47lb 64ft/s 374ft/s 10.8G 1,976ft 11.2s 10s
OK AeroTech H170 5.38lb 51ft/s 364ft/s 7.7G 1,981ft 11.4s 9s
OK Contrail I221 6.22lb 77ft/s 356ft/s 16.4G 1,988ft 11.2s 9s
OK AeroTech I180 5.50lb 73ft/s 362ft/s 13.8G 2,035ft 11.3s 9s
OK AeroTech H550 5.36lb 101ft/s 410ft/s 26.3G 2,044ft 11.0s 10s
OK AeroTech H550 5.35lb 97ft/s 414ft/s 26.5G 2,064ft 11.0s 10s
warningsW Cesaroni H565 5.45lb 96ft/s 416ft/s 26.5G 2,077ft 11.1s 11s
OK AeroTech I161 5.46lb 54ft/s 368ft/s 8.1G 2,084ft 11.7s 9s
OK AeroTech H999 5.38lb 130ft/s 429ft/s 66.2G 2,123ft 11.0s 11s
OK Cesaroni I180 5.52lb 48ft/s 387ft/s 7.9G 2,133ft 11.8s 10s
OK AeroTech I225 5.72lb 54ft/s 405ft/s 10.1G 2,281ft 12.0s 10s
OK AeroTech I245 5.45lb 77ft/s 414ft/s 16.2G 2,321ft 11.9s 10s
OK Cesaroni I212 5.70lb 52ft/s 416ft/s 9.4G 2,329ft 12.2s 11s
OK AeroTech I357 5.41lb 75ft/s 425ft/s 14.8G 2,351ft 11.9s 11s
OK Cesaroni I566 5.50lb 90ft/s 478ft/s 25.4G 2,557ft 12.1s 12s
OK Contrail I747 6.50lb 149ft/s 466ft/s 64.7G 2,579ft 12.1s 12s
OK Contrail I250 6.25lb 76ft/s 432ft/s 19.6G 2,628ft 12.7s 11s
OK Cesaroni I195 5.57lb 55ft/s 446ft/s 8.6G 2,672ft 13.0s 11s
OK Cesaroni I175 5.61lb 49ft/s 450ft/s 6.9G 2,781ft 13.4s 11s
OK Cesaroni I170 5.51lb 53ft/s 457ft/s 8.3G 2,786ft 13.3s 11s
OK Cesaroni I345 5.52lb 72ft/s 490ft/s 14.9G 2,790ft 12.8s 12s
OK AeroTech I285 5.74lb 69ft/s 479ft/s 13.9G 2,811ft 13.0s 11s
OK Cesaroni I236 5.53lb 60ft/s 482ft/s 11.6G 2,904ft 13.3s 12s
OK Cesaroni I800 5.66lb 109ft/s 533ft/s 36.3G 2,940ft 12.8s 12s
OK Cesaroni I223 5.74lb 55ft/s 489ft/s 9.3G 2,994ft 13.6s 12s
OK AeroTech I211 5.65lb 64ft/s 475ft/s 11.8G 2,995ft 13.5s 11s
OK AeroTech I195 5.91lb 67ft/s 473ft/s 12.8G 3,002ft 13.5s 11s
OK AeroTech I305 5.93lb 72ft/s 496ft/s 14.8G 3,004ft 13.3s 12s
OK AeroTech I1299 5.58lb 145ft/s 554ft/s 61.1G 3,056ft 12.9s 13s
OK AeroTech I300 5.62lb 77ft/s 508ft/s 17.6G 3,077ft 13.4s 12s
OK Loki I316 5.84lb 84ft/s 532ft/s 18.5G 3,325ft 13.8s 12s
OK Cesaroni I287 5.98lb 62ft/s 547ft/s 12.4G 3,420ft 14.2s 12s
OK Loki I210 5.84lb 72ft/s 517ft/s 16.0G 3,466ft 14.3s 12s
OK Loki I405 5.85lb 105ft/s 576ft/s 29.9G 3,576ft 14.1s 13s
OK Contrail I155 6.25lb 51ft/s 489ft/s 7.0G 3,578ft 15.3s 12s
OK Cesaroni I285 5.77lb 66ft/s 576ft/s 12.7G 3,705ft 14.7s 13s
OK Cesaroni I255 5.79lb 62ft/s 575ft/s 11.4G 3,752ft 14.9s 13s
OK Loki I377 5.88lb 95ft/s 591ft/s 24.1G 3,786ft 14.5s 13s
OK Loki I430 5.84lb 82ft/s 616ft/s 19.5G 3,814ft 14.6s 13s
OK AeroTech I327 6.03lb 74ft/s 602ft/s 15.1G 3,876ft 14.9s 13s
OK AMW I297 5.95lb 70ft/s 598ft/s 13.1G 3,889ft 14.9s 13s
OK AeroTech I364 6.14lb 71ft/s 603ft/s 14.7G 3,906ft 14.9s 13s
OK AeroTech I366 5.87lb 81ft/s 614ft/s 17.7G 3,918ft 14.8s 13s
OK Cesaroni I125 6.08lb 53ft/s 500ft/s 8.9G 3,981ft 16.1s 12s
OK Cesaroni I303 5.75lb 70ft/s 611ft/s 15.1G 3,992ft 15.1s 13s
OK Cesaroni I242 5.86lb 60ft/s 598ft/s 9.9G 4,016ft 15.4s 13s
OK Cesaroni I470 5.74lb 88ft/s 648ft/s 20.8G 4,017ft 14.8s 14s
OK AeroTech I280 6.01lb 66ft/s 611ft/s 11.6G 4,032ft 15.3s 13s
OK Cesaroni I350 6.37lb 70ft/s 640ft/s 13.3G 4,217ft 15.5s 14s
OK KBA I301 6.25lb 65ft/s 657ft/s 13.9G 4,233ft 15.3s 13s
OK AeroTech I435 5.79lb 101ft/s 667ft/s 28.3G 4,265ft 15.1s 14s
OK KBA I550 6.22lb 85ft/s 723ft/s 25.7G 4,320ft 15.1s 14s
OK AeroTech I284 5.87lb 79ft/s 651ft/s 17.8G 4,347ft 15.5s 14s
OK AeroTech I500 5.92lb 86ft/s 719ft/s 21.0G 4,655ft 15.7s 14s
OK Loki J396 6.31lb 74ft/s 703ft/s 19.0G 4,689ft 16.0s 14s
OK Cesaroni I216 5.97lb 63ft/s 640ft/s 11.7G 4,703ft 16.5s 13s
warningsW Cesaroni I540 5.97lb 92ft/s 743ft/s 23.2G 4,744ft 15.8s 15s
OK AeroTech I600 5.98lb 103ft/s 741ft/s 29.9G 4,762ft 15.8s 15s
OK Cesaroni J335 6.03lb 75ft/s 705ft/s 14.4G 4,789ft 16.2s 14s
OK AeroTech J420 6.08lb 83ft/s 722ft/s 19.7G 4,791ft 16.1s 14s
OK AeroTech I350 6.01lb 75ft/s 728ft/s 17.7G 4,801ft 16.1s 15s
OK Cesaroni J381 6.17lb 81ft/s 715ft/s 17.4G 4,810ft 16.2s 14s
OK Cesaroni J270 6.09lb 61ft/s 689ft/s 10.4G 4,821ft 16.6s 14s
OK AeroTech J350 6.12lb 98ft/s 723ft/s 29.3G 4,829ft 16.0s 14s
OK Cesaroni J285 5.96lb 68ft/s 694ft/s 13.1G 4,840ft 16.4s 14s
OK KBA J740 6.25lb 103ft/s 763ft/s 34.8G 4,847ft 15.9s 15s
OK AeroTech J340 5.92lb 86ft/s 718ft/s 21.8G 4,859ft 16.1s 14s
OK Cesaroni J316 5.99lb 74ft/s 696ft/s 15.4G 4,862ft 16.4s 14s
OK Cesaroni J357 5.97lb 76ft/s 732ft/s 18.4G 4,921ft 16.3s 15s
OK Cesaroni J290 6.10lb 72ft/s 719ft/s 13.4G 5,073ft 16.8s 14s
OK AeroTech J425 6.04lb 71ft/s 770ft/s 16.4G 5,080ft 16.5s 15s
OK Cesaroni J400 6.20lb 79ft/s 760ft/s 16.8G 5,149ft 16.6s 15s
OK AeroTech J520 6.35lb 111ft/s 767ft/s 35.5G 5,187ft 16.4s 15s
OK AeroTech J270 6.07lb 68ft/s 728ft/s 12.3G 5,234ft 17.0s 14s
OK AeroTech J500 6.09lb 102ft/s 807ft/s 28.2G 5,383ft 16.6s 15s
OK Loki J528 6.29lb 106ft/s 819ft/s 35.5G 5,442ft 16.6s 15s
OK AeroTech J575 6.67lb 104ft/s 837ft/s 29.2G 5,603ft 16.8s 16s
OK Cesaroni J330 6.20lb 79ft/s 792ft/s 15.7G 5,674ft 17.4s 15s
OK Cesaroni J410 6.27lb 80ft/s 824ft/s 17.3G 5,714ft 17.3s 15s
OK Cesaroni J425 6.19lb 85ft/s 835ft/s 23.3G 5,788ft 17.2s 15s
OK AeroTech J435 6.03lb 94ft/s 849ft/s 24.7G 5,798ft 17.2s 15s
OK Loki J712 6.31lb 100ft/s 885ft/s 30.3G 5,862ft 17.1s 16s
OK Loki J320 6.31lb 75ft/s 808ft/s 17.9G 5,946ft 17.8s 15s
OK Cesaroni J354 6.37lb 77ft/s 826ft/s 17.4G 5,990ft 17.7s 15s
OK Cesaroni J520 6.52lb 90ft/s 890ft/s 21.6G 6,093ft 17.6s 16s
OK Cesaroni J580 6.95lb 84ft/s 905ft/s 22.6G 6,250ft 17.8s 16s
OK Loki J650 7.17lb 95ft/s 926ft/s 29.5G 6,494ft 18.0s 17s
OK Cesaroni J150 6.75lb 54ft/s 702ft/s 9.8G 6,835ft 20.2s 14s
OK AeroTech J825 6.58lb 113ft/s 1,045ft/s 39.2G 6,854ft 18.1s 17s
OK Cesaroni J394 6.72lb 74ft/s 953ft/s 15.1G 6,952ft 18.8s 16s
OK Cesaroni J595 6.56lb 101ft/s 1,016ft/s 30.2G 7,040ft 18.4s 17s
OK Cesaroni J600 6.65lb 94ft/s 1,033ft/s 24.0G 7,077ft 18.5s 17s
OK Cesaroni J453 6.78lb 92ft/s 977ft/s 23.1G 7,165ft 18.8s 16s
OK Cesaroni J420 6.58lb 90ft/s 964ft/s 25.8G 7,193ft 18.8s 16s
OK AeroTech J570 6.64lb 114ft/s 996ft/s 38.1G 7,248ft 18.6s 17s
OK Cesaroni J530 6.80lb 95ft/s 1,071ft/s 25.7G 7,757ft 19.2s 17s
OK AeroTech J510 7.03lb 104ft/s 1,081ft/s 32.2G 7,987ft 19.4s 17s
OK Loki J1000 7.17lb 132ft/s 1,195ft/s 42.9G 8,156ft 19.3s 18s
OK Loki J1026 7.23lb 120ft/s 1,251ft/s 38.0G 8,445ft 19.6s 18s
OK Loki K1127 7.23lb 125ft/s 1,240ft/s 44.0G 8,480ft 19.6s 18s
OK Loki K627 7.37lb 105ft/s 1,310ft/s 29.2G 9,840ft 20.9s 18s

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 (216ft)
failedG AeroTech G67 speed at end of launch guide too slow (33ft/s)
failedG Loki G69 speed at end of launch guide too slow (35ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (31ft/s)
failedG Loki G70 speed at end of launch guide too slow (36ft/s)
failedG Loki G94 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (31ft/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 (25ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (30ft/s)
failedG Loki G66 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (32ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (25ft/s)
failedG Cesaroni G115 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (23ft/s)
failedA Contrail G300 rocket doesn't reach a safe altitude (223ft)
failedG AeroTech H73 speed at end of launch guide too slow (30ft/s)
failedG Loki H100 speed at end of launch guide too slow (42ft/s)
failedG AeroTech H123 speed at end of launch guide too slow (44ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (39ft/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 (44ft/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 (39ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (31ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (47ft/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 (23ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (25ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (44ft/s)
failedG Loki I110 speed at end of launch guide too slow (47ft/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 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.)

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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