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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 55 motors that fit and appear to have enough thrust (639 motors didn't fit, 97 motors failed safety checks). 152 motor had thrust curves available and 316 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:   Little Lumpy
Owner: Tim Cubbedge
Body Diameter: 7.68in
Dry Weight: 185.0oz
MMT Diameter: 38.0mm
MMT Length: 20.00in
CD: 0.40
Web Site: https://www.insanerocketry.com/main/display/4551581285416388653/

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 Cesaroni H400 195.0oz 51ft/s 131ft/s 7.1G 280ft 4.4s 4s
OK AeroTech H550 196.4oz 64ft/s 166ft/s 10.8G 415ft 5.2s 5s
OK AeroTech H550 196.1oz 64ft/s 167ft/s 10.9G 418ft 5.2s 5s
warningsW Cesaroni H565 197.8oz 62ft/s 169ft/s 10.7G 424ft 5.3s 5s
OK AeroTech H999 196.7oz 85ft/s 179ft/s 28.4G 443ft 5.2s 5s
OK AeroTech I245 197.9oz 49ft/s 156ft/s 6.5G 468ft 5.8s 4s
OK Cesaroni I566 198.6oz 59ft/s 195ft/s 10.2G 541ft 5.9s 5s
OK Cesaroni I800 201.1oz 72ft/s 224ft/s 14.9G 655ft 6.4s 6s
OK AeroTech I300 200.6oz 48ft/s 199ft/s 7.3G 666ft 6.8s 5s
OK AeroTech I1299 199.9oz 99ft/s 236ft/s 26.1G 692ft 6.4s 6s
OK Loki I316 204.0oz 56ft/s 214ft/s 7.8G 758ft 7.1s 6s
OK Loki I405 204.2oz 67ft/s 238ft/s 13.1G 840ft 7.2s 6s
OK Loki I430 204.0oz 53ft/s 253ft/s 8.4G 886ft 7.6s 6s
OK Loki I377 204.8oz 58ft/s 242ft/s 10.5G 893ft 7.6s 6s
OK AeroTech I327 207.2oz 48ft/s 244ft/s 6.5G 910ft 7.8s 6s
OK AeroTech I366 204.6oz 53ft/s 248ft/s 7.6G 916ft 7.8s 6s
OK Cesaroni I470 202.5oz 56ft/s 266ft/s 8.9G 943ft 7.7s 7s
OK AeroTech I435 203.3oz 65ft/s 275ft/s 12.4G 1,030ft 8.0s 7s
OK AeroTech I284 204.6oz 52ft/s 262ft/s 7.5G 1,042ft 8.2s 6s
OK KBA I550 210.1oz 58ft/s 299ft/s 10.4G 1,070ft 8.1s 7s
OK AeroTech I500 205.3oz 56ft/s 299ft/s 9.1G 1,145ft 8.4s 7s
OK Loki J396 211.5oz 48ft/s 295ft/s 8.2G 1,170ft 8.6s 7s
warningsW Cesaroni I540 206.1oz 62ft/s 312ft/s 10.0G 1,178ft 8.4s 7s
OK AeroTech I350 206.7oz 52ft/s 299ft/s 7.5G 1,181ft 8.6s 7s
OK Cesaroni J316 206.4oz 48ft/s 282ft/s 6.6G 1,188ft 8.9s 7s
OK AeroTech J420 207.9oz 56ft/s 300ft/s 8.6G 1,191ft 8.6s 7s
OK AeroTech I600 206.2oz 69ft/s 313ft/s 13.3G 1,193ft 8.4s 7s
OK Cesaroni J381 209.3oz 53ft/s 297ft/s 7.7G 1,203ft 8.8s 7s
OK AeroTech J340 205.4oz 53ft/s 293ft/s 9.5G 1,208ft 8.7s 7s
OK Cesaroni J357 206.2oz 51ft/s 298ft/s 8.0G 1,214ft 8.8s 7s
OK AeroTech J350 208.5oz 64ft/s 303ft/s 13.2G 1,222ft 8.6s 7s
OK KBA J740 210.5oz 73ft/s 336ft/s 15.0G 1,237ft 8.5s 8s
OK AeroTech J425 207.3oz 48ft/s 316ft/s 6.8G 1,260ft 9.0s 7s
OK Cesaroni J400 209.8oz 52ft/s 315ft/s 7.1G 1,303ft 9.1s 7s
OK AeroTech J520 212.2oz 75ft/s 333ft/s 16.2G 1,360ft 8.9s 7s
OK AeroTech J500 208.1oz 66ft/s 340ft/s 12.7G 1,388ft 9.1s 8s
OK Loki J528 211.3oz 72ft/s 356ft/s 16.4G 1,431ft 9.0s 8s
OK Cesaroni J330 209.8oz 51ft/s 326ft/s 6.9G 1,461ft 9.6s 7s
OK Cesaroni J410 210.9oz 54ft/s 344ft/s 7.7G 1,487ft 9.6s 8s
OK AeroTech J435 207.0oz 60ft/s 354ft/s 11.0G 1,509ft 9.5s 8s
OK Cesaroni J425 209.7oz 57ft/s 351ft/s 10.5G 1,518ft 9.5s 8s
OK AeroTech J575 217.2oz 72ft/s 370ft/s 13.4G 1,522ft 9.3s 8s
OK Loki J320 211.5oz 49ft/s 334ft/s 8.0G 1,552ft 9.9s 7s
OK Loki J712 211.5oz 70ft/s 386ft/s 13.9G 1,557ft 9.4s 8s
OK Cesaroni J354 212.4oz 52ft/s 341ft/s 7.8G 1,581ft 9.9s 7s
OK Cesaroni J520 215.0oz 58ft/s 385ft/s 9.9G 1,644ft 9.8s 8s
OK Cesaroni J580 221.8oz 60ft/s 401ft/s 9.8G 1,719ft 10.0s 8s
OK AeroTech J825 215.9oz 80ft/s 464ft/s 18.6G 1,908ft 10.1s 9s
OK Cesaroni J394 218.1oz 49ft/s 402ft/s 6.3G 1,910ft 10.8s 8s
OK Cesaroni J595 215.5oz 65ft/s 439ft/s 14.2G 1,964ft 10.4s 9s
OK Cesaroni J600 217.0oz 64ft/s 451ft/s 11.0G 1,980ft 10.5s 9s
OK Cesaroni J420 215.8oz 63ft/s 414ft/s 12.1G 2,012ft 10.7s 8s
OK Cesaroni J453 219.0oz 60ft/s 420ft/s 10.9G 2,015ft 10.8s 8s
OK AeroTech J570 216.8oz 78ft/s 433ft/s 18.1G 2,057ft 10.6s 9s
OK Cesaroni J530 219.5oz 68ft/s 467ft/s 12.2G 2,223ft 11.0s 9s

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 (29ft/s)
failedG AeroTech G339 speed at end of launch guide too slow (47ft/s)
failedG AeroTech G67 speed at end of launch guide too slow (15ft/s)
failedG Loki G69 speed at end of launch guide too slow (16ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (13ft/s)
failedG Contrail G234 speed at end of launch guide too slow (47ft/s)
failedG Loki G70 speed at end of launch guide too slow (18ft/s)
failedG Loki G94 speed at end of launch guide too slow (23ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (13ft/s)
failedG Loki G80 speed at end of launch guide too slow (20ft/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 (32ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (16ft/s)
failedG Loki G66 speed at end of launch guide too slow (19ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (14ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (15ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (8ft/s)
failedG Cesaroni G115 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (16ft/s)
failedG Contrail G123 speed at end of launch guide too slow (30ft/s)
failedG Contrail G100 speed at end of launch guide too slow (28ft/s)
failed5 Cesaroni G50 average thrust fails 5:1 thrust/weight ratio (1:1)
failedA Contrail G300 rocket doesn't reach a safe altitude (44ft)
failedG Contrail H222 speed at end of launch guide too slow (44ft/s)
failedA Contrail H300 rocket doesn't reach a safe altitude (106ft)
failedA Contrail H303 rocket doesn't reach a safe altitude (122ft)
failedG AeroTech H73 speed at end of launch guide too slow (13ft/s)
failedG Loki H100 speed at end of launch guide too slow (24ft/s)
failedG AeroTech H283 speed at end of launch guide too slow (44ft/s)
failedG AeroTech H148 speed at end of launch guide too slow (31ft/s)
failedG AeroTech H130 speed at end of launch guide too slow (36ft/s)
failedA AeroTech H669 rocket doesn't reach a safe altitude (227ft)
failedA Contrail H246 rocket doesn't reach a safe altitude (193ft)
failedG AeroTech H123 speed at end of launch guide too slow (25ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (23ft/s)
failedG AeroTech H242 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (23ft/s)
failedG AeroTech H219 speed at end of launch guide too slow (39ft/s)
failedG Loki H90 speed at end of launch guide too slow (24ft/s)
failedG Loki H144 speed at end of launch guide too slow (36ft/s)
failedG Loki H125 speed at end of launch guide too slow (31ft/s)
failedG Contrail H141 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (25ft/s)
failedG Loki H160 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (25ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (19ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (21ft/s)
failedG Cesaroni H225 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (29ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (25ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (21ft/s)
failedG AeroTech H170 speed at end of launch guide too slow (30ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (15ft/s)
failedG AeroTech I180 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I161 speed at end of launch guide too slow (32ft/s)
failedG AeroTech I218 speed at end of launch guide too slow (40ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (30ft/s)
failedG AeroTech I357 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I212 speed at end of launch guide too slow (33ft/s)
failedG AeroTech I225 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni I195 speed at end of launch guide too slow (35ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (26ft/s)
failedG Cesaroni I170 speed at end of launch guide too slow (33ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (7ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (9ft/s)
failedG Cesaroni I345 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni I175 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni I236 speed at end of launch guide too slow (38ft/s)
failedG AeroTech I285 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I195 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni I223 speed at end of launch guide too slow (35ft/s)
failedG AeroTech I211 speed at end of launch guide too slow (40ft/s)
failedG AeroTech I305 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni I287 speed at end of launch guide too slow (40ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (26ft/s)
failedG Loki I110 speed at end of launch guide too slow (28ft/s)
failedG Loki I210 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I285 speed at end of launch guide too slow (43ft/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 (46ft/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 (38ft/s)
failedG KBA I301 speed at end of launch guide too slow (45ft/s)
failedG AeroTech I280 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni I125 speed at end of launch guide too slow (30ft/s)
failedG AeroTech I364 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni I350 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I216 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni J94 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni J285 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni J335 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 J290 speed at end of launch guide too slow (45ft/s)
failedG AeroTech J270 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J150 speed at end of launch guide too slow (34ft/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.

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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