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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 103 motors that fit and appear to have enough thrust (640 motors didn't fit, 68 motors failed safety checks). 171 motor had thrust curves available and 348 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:   4 inch Big Bertha
Owner: John Cummings
Body Diameter: 4.00in
Dry Weight: 7.60lb
MMT Diameter: 38.0mm
MMT Length: 36.00in
CD: 1.20

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 H303 8.90lb 71ft/s 120ft/s 18.7G 249ft 4.0s 3s
OK Contrail H211 8.92lb 65ft/s 135ft/s 14.9G 340ft 4.8s 4s
warningsW AeroTech H283 8.14lb 55ft/s 152ft/s 8.2G 365ft 4.9s 4s
OK Contrail H246 8.92lb 61ft/s 150ft/s 12.4G 386ft 5.0s 4s
OK AeroTech H669 8.16lb 88ft/s 185ft/s 29.5G 453ft 5.3s 5s
OK AeroTech H219 8.18lb 51ft/s 170ft/s 7.0G 471ft 5.7s 5s
OK Contrail H248 9.35lb 60ft/s 165ft/s 15.6G 474ft 5.6s 4s
OK Loki H160 8.34lb 50ft/s 169ft/s 6.8G 521ft 6.0s 4s
OK Cesaroni H400 8.23lb 62ft/s 203ft/s 11.1G 555ft 5.9s 5s
OK Contrail H277 9.17lb 65ft/s 191ft/s 17.6G 591ft 6.2s 5s
OK Cesaroni H225 8.03lb 48ft/s 203ft/s 6.2G 614ft 6.4s 5s
OK Contrail H340 9.40lb 67ft/s 201ft/s 20.5G 618ft 6.3s 5s
OK Contrail I500 9.36lb 89ft/s 231ft/s 23.4G 725ft 6.6s 6s
OK AeroTech I218 8.42lb 50ft/s 218ft/s 6.6G 731ft 7.0s 5s
OK AeroTech H550 8.31lb 79ft/s 252ft/s 16.5G 760ft 6.7s 6s
OK AeroTech I180 8.45lb 56ft/s 207ft/s 8.6G 761ft 7.1s 5s
OK AeroTech H550 8.30lb 79ft/s 254ft/s 16.6G 764ft 6.7s 6s
warningsW Cesaroni H565 8.40lb 77ft/s 257ft/s 16.0G 774ft 6.8s 6s
OK AeroTech H999 8.33lb 104ft/s 268ft/s 42.4G 791ft 6.7s 6s
OK Contrail I221 9.17lb 62ft/s 216ft/s 10.8G 796ft 7.2s 5s
OK AeroTech I245 8.40lb 61ft/s 242ft/s 10.0G 861ft 7.4s 6s
OK AeroTech I357 8.36lb 58ft/s 251ft/s 9.2G 867ft 7.4s 6s
OK Cesaroni I566 8.45lb 72ft/s 295ft/s 15.3G 945ft 7.4s 7s
OK Cesaroni I345 8.47lb 59ft/s 294ft/s 9.3G 1,027ft 7.9s 7s
OK Contrail I747 9.45lb 122ft/s 309ft/s 44.2G 1,034ft 7.6s 7s
OK Contrail I250 9.20lb 59ft/s 264ft/s 13.0G 1,035ft 8.0s 6s
OK AeroTech I285 8.69lb 56ft/s 286ft/s 8.7G 1,049ft 8.1s 7s
OK Cesaroni I236 8.48lb 49ft/s 278ft/s 7.2G 1,064ft 8.3s 6s
OK Cesaroni I800 8.61lb 87ft/s 334ft/s 22.0G 1,088ft 7.8s 7s
OK AeroTech I211 8.60lb 50ft/s 273ft/s 7.4G 1,110ft 8.5s 6s
OK AeroTech I1299 8.53lb 118ft/s 351ft/s 38.8G 1,127ft 7.8s 7s
OK AeroTech I195 8.86lb 53ft/s 275ft/s 8.2G 1,131ft 8.5s 6s
OK AeroTech I305 8.88lb 57ft/s 298ft/s 9.3G 1,132ft 8.3s 7s
OK AeroTech I300 8.57lb 60ft/s 301ft/s 11.2G 1,140ft 8.3s 7s
OK Loki I316 8.79lb 65ft/s 318ft/s 11.8G 1,246ft 8.5s 7s
OK Cesaroni I287 8.93lb 49ft/s 327ft/s 7.5G 1,275ft 8.9s 7s
OK Loki I210 8.79lb 57ft/s 300ft/s 10.3G 1,299ft 8.9s 7s
OK Loki I405 8.80lb 84ft/s 350ft/s 19.5G 1,334ft 8.6s 7s
OK Cesaroni I285 8.72lb 53ft/s 337ft/s 8.1G 1,362ft 9.1s 7s
OK Cesaroni I255 8.74lb 50ft/s 334ft/s 7.1G 1,381ft 9.2s 7s
OK Loki I430 8.79lb 64ft/s 376ft/s 12.6G 1,406ft 8.9s 8s
OK Loki I377 8.83lb 75ft/s 355ft/s 15.7G 1,410ft 8.9s 7s
OK AMW I297 8.90lb 54ft/s 356ft/s 8.4G 1,443ft 9.2s 7s
OK AeroTech I327 8.98lb 59ft/s 362ft/s 9.8G 1,444ft 9.2s 7s
OK AeroTech I366 8.82lb 65ft/s 367ft/s 11.4G 1,447ft 9.1s 8s
OK AeroTech I364 9.09lb 57ft/s 361ft/s 9.2G 1,460ft 9.2s 7s
OK Cesaroni I303 8.70lb 55ft/s 358ft/s 9.7G 1,465ft 9.3s 7s
OK Cesaroni I470 8.69lb 69ft/s 394ft/s 13.4G 1,468ft 9.0s 8s
OK AeroTech I280 8.96lb 54ft/s 360ft/s 7.5G 1,492ft 9.5s 7s
OK KBA I301 9.20lb 53ft/s 369ft/s 8.8G 1,560ft 9.6s 8s
OK AeroTech I435 8.74lb 80ft/s 403ft/s 18.4G 1,565ft 9.2s 8s
OK KBA I550 9.17lb 72ft/s 419ft/s 14.6G 1,572ft 9.3s 8s
OK Cesaroni I350 9.32lb 56ft/s 388ft/s 8.7G 1,583ft 9.6s 8s
OK AeroTech I284 8.82lb 64ft/s 384ft/s 11.4G 1,602ft 9.5s 8s
OK AeroTech I500 8.87lb 68ft/s 436ft/s 13.6G 1,700ft 9.5s 8s
warningsW Cesaroni I540 8.92lb 74ft/s 454ft/s 14.9G 1,729ft 9.5s 8s
OK KBA J520 9.19lb 69ft/s 445ft/s 16.4G 1,732ft 9.7s 8s
OK Loki J396 9.26lb 60ft/s 427ft/s 12.0G 1,739ft 9.8s 8s
OK Cesaroni I216 8.92lb 50ft/s 365ft/s 7.5G 1,740ft 10.3s 7s
OK AeroTech I600 8.93lb 85ft/s 453ft/s 19.6G 1,741ft 9.5s 8s
OK AeroTech I350 8.96lb 62ft/s 435ft/s 11.2G 1,756ft 9.8s 8s
OK AeroTech J420 9.03lb 69ft/s 434ft/s 12.9G 1,760ft 9.8s 8s
OK Cesaroni J335 8.98lb 60ft/s 417ft/s 9.3G 1,763ft 10.0s 8s
OK Cesaroni J270 9.04lb 49ft/s 399ft/s 6.4G 1,776ft 10.3s 8s
OK Cesaroni J285 8.91lb 56ft/s 404ft/s 8.2G 1,777ft 10.1s 8s
OK Cesaroni J381 9.12lb 63ft/s 430ft/s 11.5G 1,778ft 9.9s 8s
OK KBA J740 9.20lb 85ft/s 485ft/s 21.6G 1,778ft 9.5s 9s
OK AeroTech J350 9.07lb 80ft/s 437ft/s 19.4G 1,784ft 9.7s 8s
OK AeroTech J340 8.87lb 66ft/s 425ft/s 14.2G 1,788ft 9.8s 8s
OK Cesaroni J316 8.94lb 59ft/s 410ft/s 10.0G 1,790ft 10.1s 8s
OK Cesaroni J357 8.92lb 62ft/s 433ft/s 12.0G 1,801ft 10.0s 8s
OK AeroTech J520 9.27lb 84ft/s 447ft/s 20.7G 1,836ft 9.8s 8s
OK AeroTech J425 8.99lb 58ft/s 461ft/s 10.1G 1,849ft 10.0s 8s
OK Cesaroni J290 9.05lb 56ft/s 417ft/s 8.7G 1,870ft 10.4s 8s
OK Cesaroni J400 9.15lb 63ft/s 454ft/s 10.6G 1,892ft 10.1s 8s
OK Loki J474 9.27lb 91ft/s 447ft/s 28.0G 1,910ft 9.9s 8s
OK AeroTech J270 9.02lb 53ft/s 418ft/s 7.9G 1,924ft 10.5s 8s
OK AeroTech J500 9.04lb 78ft/s 486ft/s 18.7G 1,963ft 10.0s 9s
OK Loki J528 9.24lb 88ft/s 507ft/s 23.8G 1,993ft 10.0s 9s
OK Loki J326 9.29lb 76ft/s 427ft/s 22.6G 2,019ft 10.4s 8s
OK AeroTech J575 9.62lb 86ft/s 521ft/s 19.4G 2,073ft 10.1s 9s
OK Cesaroni J330 9.15lb 61ft/s 466ft/s 10.3G 2,082ft 10.6s 8s
OK Cesaroni J410 9.22lb 65ft/s 490ft/s 11.4G 2,094ft 10.5s 9s
OK AeroTech J435 8.98lb 76ft/s 505ft/s 16.3G 2,104ft 10.4s 9s
OK Cesaroni J425 9.14lb 68ft/s 499ft/s 15.5G 2,118ft 10.4s 8s
OK Loki J712 9.26lb 84ft/s 550ft/s 20.4G 2,128ft 10.2s 9s
OK Cesaroni J354 9.32lb 64ft/s 481ft/s 11.6G 2,210ft 10.8s 8s
OK Cesaroni J520 9.47lb 73ft/s 542ft/s 14.5G 2,233ft 10.6s 9s
OK Cesaroni J580 9.90lb 70ft/s 560ft/s 14.2G 2,306ft 10.8s 9s
OK Loki J650 10.12lb 76ft/s 584ft/s 17.7G 2,398ft 10.8s 9s
OK AeroTech J825 9.53lb 100ft/s 650ft/s 26.7G 2,467ft 10.7s 10s
OK Cesaroni J595 9.51lb 79ft/s 608ft/s 20.5G 2,552ft 11.0s 9s
OK Cesaroni J394 9.67lb 58ft/s 559ft/s 9.3G 2,555ft 11.5s 9s
OK Cesaroni J600 9.60lb 78ft/s 627ft/s 16.0G 2,567ft 11.1s 9s
OK Cesaroni J453 9.73lb 71ft/s 578ft/s 15.8G 2,635ft 11.4s 9s
OK Cesaroni J420 9.53lb 74ft/s 571ft/s 17.5G 2,639ft 11.4s 9s
OK AeroTech J570 9.59lb 98ft/s 593ft/s 26.0G 2,650ft 11.1s 9s
OK Cesaroni J530 9.75lb 82ft/s 639ft/s 17.5G 2,824ft 11.5s 9s
OK Loki J1000 10.12lb 111ft/s 757ft/s 30.1G 2,928ft 11.3s 10s
OK AeroTech J510 9.98lb 84ft/s 643ft/s 22.4G 2,937ft 11.6s 9s
OK Loki J1026 10.18lb 100ft/s 788ft/s 25.3G 3,019ft 11.5s 10s
OK Loki K1127 10.18lb 105ft/s 778ft/s 29.2G 3,040ft 11.4s 10s
OK Loki K627 10.32lb 86ft/s 775ft/s 20.6G 3,569ft 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
failedG Contrail G130 speed at end of launch guide too slow (40ft/s)
failedA AeroTech G339 rocket doesn't reach a safe altitude (134ft)
failedG AeroTech G67 speed at end of launch guide too slow (24ft/s)
failedG Loki G69 speed at end of launch guide too slow (25ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (22ft/s)
failedA Contrail G234 rocket doesn't reach a safe altitude (124ft)
failedG Loki G70 speed at end of launch guide too slow (26ft/s)
failedG Loki G94 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (21ft/s)
failedG Loki G80 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni G46 speed at end of launch guide too slow (15ft/s)
failedG Cesaroni G185 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (22ft/s)
failedG Loki G66 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (22ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (17ft/s)
failedG Cesaroni G115 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (24ft/s)
failedG Contrail G123 speed at end of launch guide too slow (40ft/s)
failedG Contrail G100 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (15ft/s)
failedA Contrail G300 rocket doesn't reach a safe altitude (94ft)
failedA Contrail H222 rocket doesn't reach a safe altitude (218ft)
failedA Contrail H300 rocket doesn't reach a safe altitude (221ft)
failedG AeroTech H73 speed at end of launch guide too slow (21ft/s)
failedG Loki H100 speed at end of launch guide too slow (31ft/s)
failedG AeroTech H148 speed at end of launch guide too slow (40ft/s)
failedG AeroTech H130 speed at end of launch guide too slow (47ft/s)
failedG AeroTech H123 speed at end of launch guide too slow (33ft/s)
failedG Contrail H121 speed at end of launch guide too slow (39ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (30ft/s)
failedG AeroTech H242 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (30ft/s)
failedG Loki H90 speed at end of launch guide too slow (33ft/s)
failedG Loki H144 speed at end of launch guide too slow (46ft/s)
failedG Loki H125 speed at end of launch guide too slow (41ft/s)
failedG Contrail H141 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (33ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (33ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (26ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (38ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (29ft/s)
failedG AeroTech H170 speed at end of launch guide too slow (39ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (22ft/s)
failedG AeroTech I161 speed at end of launch guide too slow (42ft/s)
failedG AeroTech I175 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni I212 speed at end of launch guide too slow (42ft/s)
failedG AeroTech I225 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni I195 speed at end of launch guide too slow (43ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni I170 speed at end of launch guide too slow (42ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (15ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (17ft/s)
failedG Cesaroni I175 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni I223 speed at end of launch guide too slow (43ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (34ft/s)
failedG Loki I110 speed at end of launch guide too slow (36ft/s)
failedG Contrail I155 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni I242 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni I125 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni J94 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni J150 speed at end of launch guide too slow (43ft/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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