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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 61 motors that fit and appear to have enough thrust (640 motors didn't fit, 110 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:   just a yellow rocket 38mmt
Owner: Jim Fields
Body Diameter: 4.00in
Dry Weight: 14.00lb
MMT Diameter: 38.0mm
MMT Length: 30.00in
CD: 0.45

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 H550 14.71lb 62ft/s 137ft/s 8.9G 322ft 4.7s 4s
OK AeroTech H550 14.70lb 62ft/s 137ft/s 8.9G 324ft 4.7s 4s
OK Contrail I500 15.76lb 69ft/s 132ft/s 13.5G 324ft 4.7s 4s
warningsW Cesaroni H565 14.80lb 61ft/s 140ft/s 8.9G 330ft 4.8s 4s
OK Contrail I221 15.57lb 49ft/s 116ft/s 5.9G 333ft 5.1s 3s
OK AeroTech H999 14.73lb 83ft/s 148ft/s 23.5G 351ft 4.8s 4s
OK AeroTech I245 14.80lb 48ft/s 128ft/s 5.3G 359ft 5.3s 4s
OK Cesaroni I566 14.85lb 59ft/s 162ft/s 8.6G 436ft 5.5s 5s
OK Contrail I250 15.60lb 48ft/s 148ft/s 7.2G 483ft 6.0s 4s
OK Contrail I747 15.85lb 97ft/s 182ft/s 25.9G 543ft 5.9s 5s
OK Cesaroni I800 15.01lb 71ft/s 186ft/s 12.6G 554ft 6.1s 6s
OK AeroTech I1299 14.93lb 96ft/s 197ft/s 21.8G 599ft 6.2s 6s
OK Loki I316 15.19lb 54ft/s 180ft/s 6.4G 644ft 6.8s 5s
OK Loki I405 15.20lb 63ft/s 202ft/s 10.9G 742ft 7.1s 6s
OK Loki I430 15.19lb 51ft/s 213ft/s 6.9G 784ft 7.5s 6s
OK Loki I377 15.23lb 57ft/s 205ft/s 8.7G 794ft 7.5s 6s
OK AeroTech I366 15.22lb 52ft/s 210ft/s 6.2G 815ft 7.7s 6s
OK Cesaroni I470 15.09lb 55ft/s 224ft/s 7.3G 856ft 7.7s 7s
OK AeroTech I284 15.22lb 51ft/s 224ft/s 6.2G 958ft 8.3s 6s
OK AeroTech I435 15.14lb 63ft/s 235ft/s 10.2G 963ft 8.1s 7s
OK KBA I550 15.57lb 57ft/s 244ft/s 8.5G 977ft 8.2s 7s
OK AeroTech I500 15.27lb 55ft/s 255ft/s 7.5G 1,105ft 8.7s 7s
OK AeroTech I350 15.36lb 50ft/s 256ft/s 6.2G 1,136ft 9.0s 7s
OK KBA J520 15.59lb 56ft/s 264ft/s 9.2G 1,145ft 8.8s 8s
warningsW Cesaroni I540 15.32lb 59ft/s 266ft/s 8.3G 1,154ft 8.9s 8s
OK AeroTech J420 15.43lb 55ft/s 258ft/s 7.1G 1,154ft 9.0s 7s
OK Cesaroni J381 15.52lb 51ft/s 255ft/s 6.3G 1,163ft 9.1s 7s
OK AeroTech J340 15.27lb 53ft/s 252ft/s 7.8G 1,167ft 9.1s 7s
OK Cesaroni J357 15.32lb 49ft/s 256ft/s 6.5G 1,171ft 9.2s 7s
OK AeroTech I600 15.33lb 66ft/s 268ft/s 11.0G 1,179ft 8.9s 8s
OK AeroTech J350 15.47lb 62ft/s 262ft/s 10.9G 1,203ft 9.1s 7s
OK KBA J740 15.60lb 71ft/s 286ft/s 13.1G 1,249ft 9.0s 8s
OK AeroTech J520 15.67lb 68ft/s 274ft/s 11.8G 1,287ft 9.3s 8s
OK Cesaroni J400 15.55lb 51ft/s 273ft/s 6.0G 1,296ft 9.6s 8s
OK Loki J474 15.67lb 68ft/s 278ft/s 16.1G 1,366ft 9.6s 8s
OK Loki J326 15.69lb 58ft/s 268ft/s 12.9G 1,409ft 10.0s 8s
OK AeroTech J500 15.44lb 63ft/s 295ft/s 10.5G 1,438ft 9.8s 8s
OK Cesaroni J330 15.55lb 49ft/s 286ft/s 5.6G 1,496ft 10.4s 8s
OK Loki J528 15.64lb 70ft/s 310ft/s 13.7G 1,516ft 9.9s 9s
OK Cesaroni J410 15.62lb 53ft/s 302ft/s 6.3G 1,553ft 10.4s 9s
OK AeroTech J435 15.38lb 60ft/s 310ft/s 9.1G 1,602ft 10.4s 9s
OK Cesaroni J425 15.54lb 56ft/s 307ft/s 8.7G 1,609ft 10.5s 9s
OK AeroTech J575 16.02lb 71ft/s 324ft/s 11.3G 1,664ft 10.4s 9s
OK Cesaroni J354 15.72lb 51ft/s 304ft/s 6.4G 1,668ft 10.9s 8s
OK Loki J712 15.66lb 68ft/s 335ft/s 11.6G 1,709ft 10.5s 9s
OK Cesaroni J520 15.87lb 57ft/s 338ft/s 8.3G 1,820ft 11.1s 9s
OK Cesaroni J580 16.30lb 58ft/s 355ft/s 8.8G 1,942ft 11.4s 10s
OK Loki J650 16.52lb 66ft/s 376ft/s 12.0G 2,122ft 11.7s 10s
OK Cesaroni J394 16.07lb 48ft/s 363ft/s 6.0G 2,188ft 12.4s 10s
OK AeroTech J825 15.93lb 81ft/s 408ft/s 15.6G 2,325ft 12.1s 11s
OK Cesaroni J595 15.91lb 66ft/s 397ft/s 11.8G 2,373ft 12.4s 11s
OK Cesaroni J420 15.93lb 60ft/s 378ft/s 10.1G 2,395ft 12.7s 10s
OK Cesaroni J600 16.00lb 62ft/s 403ft/s 9.3G 2,404ft 12.5s 11s
OK Cesaroni J453 16.13lb 59ft/s 385ft/s 9.1G 2,406ft 12.7s 10s
OK AeroTech J570 15.99lb 78ft/s 399ft/s 15.2G 2,528ft 12.7s 11s
OK Cesaroni J530 16.15lb 66ft/s 432ft/s 10.2G 2,827ft 13.5s 11s
OK AeroTech J510 16.38lb 69ft/s 446ft/s 13.2G 3,029ft 13.9s 11s
OK Loki J1000 16.52lb 89ft/s 500ft/s 18.0G 3,232ft 13.9s 13s
OK Loki J1026 16.58lb 83ft/s 520ft/s 15.6G 3,405ft 14.3s 13s
OK Loki K1127 16.58lb 84ft/s 523ft/s 18.3G 3,485ft 14.4s 13s
OK Loki K627 16.72lb 73ft/s 570ft/s 12.3G 4,359ft 16.3s 14s

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 (25ft/s)
failedG AeroTech G339 speed at end of launch guide too slow (43ft/s)
failedG AeroTech G67 speed at end of launch guide too slow (10ft/s)
failedG Loki G69 speed at end of launch guide too slow (11ft/s)
failed5 AeroTech G61 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Contrail G234 speed at end of launch guide too slow (40ft/s)
failedG Loki G70 speed at end of launch guide too slow (13ft/s)
failedG Loki G94 speed at end of launch guide too slow (20ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (6ft/s)
failedG Loki G80 speed at end of launch guide too slow (17ft/s)
failed5 Cesaroni G46 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Cesaroni G185 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (14ft/s)
failedG Loki G66 speed at end of launch guide too slow (16ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (9ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (12ft/s)
failed5 Cesaroni G58 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Cesaroni G115 speed at end of launch guide too slow (20ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (12ft/s)
failedG Contrail G123 speed at end of launch guide too slow (27ft/s)
failedG Contrail G100 speed at end of launch guide too slow (25ft/s)
failed5 Cesaroni G50 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Contrail G300 speed at end of launch guide too slow (40ft/s)
failedG Contrail H222 speed at end of launch guide too slow (42ft/s)
failedG Contrail H300 speed at end of launch guide too slow (44ft/s)
failedA Contrail H303 rocket doesn't reach a safe altitude (86ft)
failedG AeroTech H73 speed at end of launch guide too slow (10ft/s)
failedG Loki H100 speed at end of launch guide too slow (22ft/s)
failedG AeroTech H283 speed at end of launch guide too slow (43ft/s)
failedG AeroTech H148 speed at end of launch guide too slow (29ft/s)
failedA Contrail H211 rocket doesn't reach a safe altitude (119ft)
failedG AeroTech H130 speed at end of launch guide too slow (35ft/s)
failedA AeroTech H669 rocket doesn't reach a safe altitude (166ft)
failedA Contrail H246 rocket doesn't reach a safe altitude (139ft)
failedG AeroTech H123 speed at end of launch guide too slow (23ft/s)
failedG Contrail H121 speed at end of launch guide too slow (28ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (21ft/s)
failedG AeroTech H242 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (22ft/s)
failedG AeroTech H219 speed at end of launch guide too slow (38ft/s)
failedG Loki H90 speed at end of launch guide too slow (21ft/s)
failedG Loki H144 speed at end of launch guide too slow (33ft/s)
failedG Loki H125 speed at end of launch guide too slow (29ft/s)
failedG Contrail H141 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (24ft/s)
failedA Cesaroni H400 rocket doesn't reach a safe altitude (204ft)
failedG Loki H160 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (23ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (16ft/s)
failedG Contrail H248 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (19ft/s)
failedG Cesaroni H225 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (28ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (18ft/s)
failedG Contrail H277 speed at end of launch guide too slow (47ft/s)
failedA Contrail H340 rocket doesn't reach a safe altitude (255ft)
failedG AeroTech H170 speed at end of launch guide too slow (29ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (12ft/s)
failedG AeroTech I180 speed at end of launch guide too slow (44ft/s)
failedG AeroTech I161 speed at end of launch guide too slow (31ft/s)
failedG AeroTech I218 speed at end of launch guide too slow (38ft/s)
failedG AeroTech I175 speed at end of launch guide too slow (35ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (29ft/s)
failedG AeroTech I357 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni I212 speed at end of launch guide too slow (32ft/s)
failedG AeroTech I225 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni I195 speed at end of launch guide too slow (34ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni I170 speed at end of launch guide too slow (31ft/s)
failed5 AeroTech I49 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Cesaroni I55 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Cesaroni I345 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni I175 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni I236 speed at end of launch guide too slow (37ft/s)
failedG AeroTech I285 speed at end of launch guide too slow (45ft/s)
failedG AeroTech I195 speed at end of launch guide too slow (41ft/s)
failedG AeroTech I300 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I223 speed at end of launch guide too slow (34ft/s)
failedG AeroTech I211 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I305 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I287 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (25ft/s)
failedG Loki I110 speed at end of launch guide too slow (26ft/s)
failedG Loki I210 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni I285 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni I255 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni I303 speed at end of launch guide too slow (44ft/s)
failedG AeroTech I327 speed at end of launch guide too slow (46ft/s)
failedG Contrail I155 speed at end of launch guide too slow (31ft/s)
failedG AMW I297 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni I242 speed at end of launch guide too slow (37ft/s)
failedG KBA I301 speed at end of launch guide too slow (44ft/s)
failedG AeroTech I280 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni I125 speed at end of launch guide too slow (28ft/s)
failedG AeroTech I364 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I350 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni I216 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni J94 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni J285 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni J335 speed at end of launch guide too slow (47ft/s)
failedG Loki J396 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni J270 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni J316 speed at end of launch guide too slow (47ft/s)
failedG AeroTech J425 speed at end of launch guide too slow (48ft/s)
failedG Cesaroni J290 speed at end of launch guide too slow (43ft/s)
failedG AeroTech J270 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni J150 speed at end of launch guide too slow (33ft/s)

G These simulations were run with a launch guide length of 7ft (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.

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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