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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 94 motors that fit and appear to have enough thrust (712 motors didn't fit, 5 motors failed safety checks). 99 motor had thrust curves available and 183 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:   Big Bad Bertha
Owner: Edward Wilk
Body Diameter: 8.25in
Dry Weight: 38.00lb
MMT Diameter: 75.0mm
MMT Length: 37.00in
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 Contrail K630 45.83lb 56ft/s 157ft/s 3.4G 532ft 6.7s 4s
OK Contrail K707 46.10lb 71ft/s 158ft/s 5.7G 537ft 6.4s 4s
OK AeroTech K1499 41.84lb 91ft/s 201ft/s 8.3G 647ft 6.6s 6s
OK Contrail K456 46.17lb 55ft/s 155ft/s 3.4G 652ft 7.5s 4s
OK Cesaroni K735 43.53lb 53ft/s 240ft/s 3.6G 1,078ft 9.3s 6s
OK Contrail K543 45.95lb 57ft/s 219ft/s 3.4G 1,084ft 9.4s 6s
OK AeroTech K780 44.47lb 60ft/s 285ft/s 3.9G 1,445ft 10.5s 8s
OK Cesaroni K510 43.71lb 50ft/s 241ft/s 2.5G 1,463ft 11.5s 7s
OK AeroTech K560 44.05lb 51ft/s 250ft/s 3.0G 1,495ft 11.2s 6s
OK Cesaroni K661 43.57lb 51ft/s 278ft/s 2.9G 1,510ft 11.1s 7s
OK Cesaroni K1085 43.36lb 68ft/s 320ft/s 5.1G 1,588ft 10.6s 8s
OK Cesaroni K2000 43.43lb 101ft/s 351ft/s 11.9G 1,617ft 10.0s 9s
OK Cesaroni L585 44.14lb 48ft/s 279ft/s 2.4G 1,666ft 12.0s 7s
OK AeroTech K1000 43.74lb 70ft/s 326ft/s 4.9G 1,690ft 10.8s 8s
OK Cesaroni L820 45.54lb 53ft/s 345ft/s 3.8G 1,989ft 12.4s 9s
OK Loki L780 45.72lb 50ft/s 348ft/s 3.6G 2,043ft 12.6s 9s
OK Cesaroni L910 43.77lb 64ft/s 357ft/s 4.4G 2,047ft 12.1s 9s
OK Gorilla L425 45.72lb 48ft/s 265ft/s 2.7G 2,224ft 14.4s 6s
OK Gorilla L789 45.45lb 55ft/s 373ft/s 3.5G 2,348ft 13.3s 9s
OK Cesaroni L645 46.27lb 49ft/s 345ft/s 2.7G 2,385ft 14.0s 9s
OK Cesaroni L3200 45.20lb 124ft/s 497ft/s 17.8G 2,567ft 12.1s 11s
OK AeroTech L1150 46.10lb 73ft/s 430ft/s 5.4G 2,609ft 13.2s 10s
OK Loki L930 45.80lb 61ft/s 409ft/s 4.5G 2,629ft 13.7s 10s
OK Gorilla L985 46.01lb 59ft/s 430ft/s 4.5G 2,633ft 13.7s 10s
OK Gorilla L1150 45.72lb 69ft/s 440ft/s 7.6G 2,721ft 13.4s 10s
OK AeroTech L875 48.09lb 58ft/s 413ft/s 3.7G 2,729ft 14.1s 10s
OK Cesaroni L851 46.35lb 57ft/s 412ft/s 3.7G 2,732ft 14.2s 10s
OK Cesaroni L995 45.92lb 71ft/s 423ft/s 5.3G 2,749ft 13.6s 10s
OK AeroTech L850 46.25lb 67ft/s 407ft/s 4.8G 2,779ft 13.9s 9s
OK AeroTech L900 48.41lb 58ft/s 420ft/s 3.8G 2,802ft 14.2s 10s
OK Gorilla L1112 46.00lb 71ft/s 449ft/s 5.3G 2,819ft 13.7s 10s
OK Cesaroni L800 45.74lb 65ft/s 401ft/s 4.9G 2,836ft 14.3s 9s
OK AeroTech L1040 48.40lb 63ft/s 437ft/s 4.8G 2,848ft 14.0s 10s
OK Cesaroni L1050 45.60lb 69ft/s 447ft/s 5.0G 2,875ft 13.9s 10s
OK AeroTech L1256 46.28lb 78ft/s 467ft/s 6.2G 2,911ft 13.7s 11s
OK Cesaroni L1720 45.37lb 89ft/s 510ft/s 8.7G 2,930ft 13.3s 11s
OK AeroTech L1520 46.05lb 83ft/s 493ft/s 7.3G 2,942ft 13.5s 11s
OK Loki L840 46.26lb 62ft/s 422ft/s 4.7G 2,974ft 14.3s 10s
OK Cesaroni L1355 48.94lb 80ft/s 480ft/s 7.2G 3,044ft 13.9s 11s
OK Loki L1482 45.80lb 78ft/s 514ft/s 6.8G 3,051ft 13.8s 11s
OK AeroTech L1390 46.55lb 78ft/s 496ft/s 7.0G 3,084ft 13.9s 11s
OK AeroTech L1170 49.00lb 73ft/s 489ft/s 5.8G 3,195ft 14.4s 11s
OK AeroTech L1250 50.45lb 73ft/s 491ft/s 5.9G 3,270ft 14.6s 11s
OK Gorilla L1065 49.82lb 77ft/s 490ft/s 7.1G 3,415ft 14.6s 11s
OK Cesaroni L1350 45.87lb 79ft/s 534ft/s 6.5G 3,451ft 14.6s 11s
OK AMW L1290 49.90lb 71ft/s 534ft/s 5.7G 3,596ft 15.2s 11s
OK AeroTech L1420 48.06lb 80ft/s 562ft/s 6.7G 3,663ft 15.0s 12s
OK AeroTech L1365 48.82lb 80ft/s 559ft/s 6.5G 3,759ft 15.3s 12s
OK Cesaroni L1410 49.28lb 75ft/s 570ft/s 6.3G 3,789ft 15.3s 12s
OK Cesaroni L1685 51.34lb 94ft/s 585ft/s 8.9G 3,910ft 15.1s 12s
OK Cesaroni L1395 47.53lb 82ft/s 591ft/s 7.5G 3,956ft 15.4s 12s
OK Cesaroni L2375 47.17lb 105ft/s 664ft/s 11.5G 3,994ft 14.8s 13s
OK Cesaroni L1115 47.71lb 79ft/s 541ft/s 6.8G 3,997ft 15.9s 11s
OK Loki M1200 49.83lb 66ft/s 567ft/s 5.7G 4,052ft 16.0s 12s
OK AeroTech L2200 48.54lb 104ft/s 646ft/s 13.4G 4,074ft 14.9s 13s
OK AeroTech M1350 48.60lb 83ft/s 586ft/s 7.2G 4,144ft 15.7s 12s
OK Cesaroni M1101 48.89lb 72ft/s 555ft/s 5.6G 4,154ft 16.3s 12s
OK Gorilla M745 50.39lb 75ft/s 459ft/s 6.0G 4,160ft 16.9s 10s
OK AeroTech M1500 48.79lb 79ft/s 611ft/s 6.9G 4,177ft 15.8s 12s
OK Gorilla M1355 50.13lb 77ft/s 592ft/s 7.4G 4,203ft 15.9s 12s
OK Loki M900 50.19lb 55ft/s 531ft/s 3.7G 4,284ft 17.3s 11s
OK AeroTech M1550 50.44lb 91ft/s 630ft/s 8.4G 4,362ft 16.0s 12s
OK AeroTech M1297 48.22lb 89ft/s 602ft/s 8.3G 4,400ft 16.1s 12s
OK AeroTech M1780 48.39lb 100ft/s 658ft/s 10.1G 4,425ft 15.7s 12s
OK Cesaroni M1230 48.68lb 76ft/s 596ft/s 6.0G 4,430ft 16.5s 12s
OK Cesaroni M2250 47.73lb 109ft/s 700ft/s 11.5G 4,438ft 15.4s 13s
OK AeroTech M2050 48.05lb 104ft/s 685ft/s 11.0G 4,462ft 15.7s 13s
OK Cesaroni M1830 47.97lb 94ft/s 680ft/s 9.5G 4,547ft 15.9s 13s
OK Gorilla M1665 50.39lb 93ft/s 651ft/s 9.2G 4,575ft 16.1s 13s
OK Cesaroni M1770 51.21lb 86ft/s 689ft/s 7.7G 4,673ft 16.4s 13s
OK Cesaroni M1160 50.56lb 67ft/s 604ft/s 5.1G 4,678ft 17.3s 12s
OK Gorilla M1952 50.00lb 103ft/s 705ft/s 11.2G 4,793ft 16.2s 13s
OK Cesaroni M2075 53.85lb 103ft/s 698ft/s 11.3G 4,817ft 16.3s 13s
OK Cesaroni M1670 49.53lb 88ft/s 680ft/s 9.0G 4,831ft 16.6s 13s
OK AeroTech M650 49.30lb 68ft/s 472ft/s 5.1G 4,874ft 18.7s 7s
OK Cesaroni M1810 49.94lb 89ft/s 717ft/s 8.4G 4,899ft 16.6s 13s
OK Cesaroni M3100 49.06lb 120ft/s 808ft/s 15.9G 4,905ft 15.8s 14s
OK Cesaroni M1675 49.51lb 90ft/s 708ft/s 8.4G 4,984ft 16.6s 13s
OK Cesaroni M1401 50.73lb 77ft/s 665ft/s 6.4G 4,997ft 17.2s 12s
OK Loki M1882 50.20lb 99ft/s 736ft/s 10.5G 5,003ft 16.4s 13s
OK Cesaroni M1400 49.69lb 89ft/s 659ft/s 8.9G 5,040ft 17.0s 12s
OK Cesaroni M1300 50.47lb 106ft/s 628ft/s 11.7G 5,197ft 17.2s 12s
OK Loki M1650 50.41lb 107ft/s 683ft/s 15.7G 5,221ft 16.9s 12s
OK Loki M2550 50.19lb 113ft/s 807ft/s 12.5G 5,227ft 16.4s 14s
OK Cesaroni M3700 50.74lb 131ft/s 877ft/s 17.4G 5,324ft 16.2s 14s
OK AeroTech M1315 50.44lb 82ft/s 658ft/s 7.0G 5,326ft 17.7s 12s
OK Cesaroni M1540 51.02lb 91ft/s 718ft/s 9.6G 5,427ft 17.4s 13s
OK Cesaroni M2045 51.38lb 102ft/s 817ft/s 10.3G 5,749ft 17.3s 14s
OK AeroTech M1850 52.76lb 90ft/s 688ft/s 9.3G 5,768ft 18.0s 12s
OK Cesaroni M2150 51.94lb 98ft/s 832ft/s 10.3G 5,817ft 17.4s 14s
OK Cesaroni M1590 51.40lb 97ft/s 760ft/s 9.1G 5,995ft 18.0s 13s
OK Cesaroni M840 53.33lb 74ft/s 566ft/s 7.3G 6,019ft 20.2s 11s
OK AeroTech M685 53.45lb 69ft/s 507ft/s 4.8G 6,056ft 21.1s 9s
OK Cesaroni M2020 53.50lb 103ft/s 862ft/s 10.2G 6,436ft 18.1s 14s

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 Cesaroni K555 speed at end of launch guide too slow (43ft/s)
failedG Gorilla L695 speed at end of launch guide too slow (45ft/s)
failedG Loki L480 speed at end of launch guide too slow (37ft/s)
failedG Contrail L369 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni L395 speed at end of launch guide too slow (39ft/s)

G These simulations were run with a launch guide length of 16ft (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.)

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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