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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 75 motors that fit and appear to have enough thrust (623 motors didn't fit, 93 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:   Doorknob Stretch
Owner: Jim Lane
Body Diameter: 7.70in
Dry Weight: 217.0oz
MMT Diameter: 38.0mm
MMT Length: 32.00in
CD: 0.35

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 I180 230.6oz 48ft/s 107ft/s 4.6G 298ft 4.9s 3s
OK AeroTech H550 228.4oz 67ft/s 141ft/s 9.2G 322ft 4.7s 4s
OK AeroTech H550 228.1oz 67ft/s 141ft/s 9.2G 324ft 4.7s 4s
OK Contrail I500 245.2oz 76ft/s 135ft/s 13.9G 324ft 4.6s 4s
warningsW Cesaroni H565 229.8oz 66ft/s 144ft/s 9.1G 330ft 4.7s 4s
OK Contrail I221 242.0oz 53ft/s 118ft/s 6.1G 336ft 5.1s 3s
OK AeroTech H999 228.7oz 91ft/s 152ft/s 24.3G 348ft 4.7s 4s
OK AeroTech I245 229.9oz 52ft/s 130ft/s 5.5G 360ft 5.2s 4s
OK AeroTech I357 229.1oz 49ft/s 136ft/s 4.9G 362ft 5.2s 4s
OK Cesaroni I566 230.6oz 64ft/s 166ft/s 8.8G 428ft 5.4s 5s
OK Cesaroni I345 230.9oz 50ft/s 162ft/s 5.1G 459ft 5.8s 5s
OK AeroTech I285 234.4oz 49ft/s 158ft/s 4.8G 471ft 5.9s 4s
OK Contrail I250 242.5oz 51ft/s 150ft/s 7.5G 476ft 5.9s 4s
OK Contrail I747 246.6oz 103ft/s 187ft/s 26.7G 522ft 5.7s 5s
OK AeroTech I300 232.6oz 50ft/s 168ft/s 6.2G 530ft 6.2s 5s
OK Cesaroni I800 233.1oz 77ft/s 191ft/s 12.8G 531ft 5.9s 5s
OK AeroTech I305 237.5oz 51ft/s 168ft/s 5.2G 535ft 6.2s 5s
OK AeroTech I1299 231.9oz 106ft/s 203ft/s 22.4G 569ft 5.9s 6s
OK Loki I316 236.0oz 58ft/s 183ft/s 6.6G 616ft 6.5s 5s
OK Loki I210 236.0oz 49ft/s 169ft/s 5.7G 625ft 6.8s 5s
OK Loki I405 236.2oz 68ft/s 204ft/s 11.2G 696ft 6.8s 6s
OK Loki I430 236.0oz 55ft/s 216ft/s 7.1G 733ft 7.1s 6s
OK Loki I377 236.8oz 64ft/s 207ft/s 9.0G 741ft 7.1s 6s
OK Cesaroni I303 234.6oz 48ft/s 204ft/s 5.3G 750ft 7.4s 6s
OK AeroTech I327 239.2oz 50ft/s 209ft/s 5.5G 752ft 7.3s 6s
OK AeroTech I366 236.6oz 57ft/s 212ft/s 6.4G 759ft 7.3s 6s
OK AeroTech I364 240.9oz 49ft/s 210ft/s 5.2G 766ft 7.4s 6s
OK Cesaroni I470 234.5oz 61ft/s 228ft/s 7.5G 789ft 7.3s 6s
OK KBA I301 242.6oz 48ft/s 222ft/s 5.0G 862ft 7.8s 6s
OK Cesaroni I350 244.6oz 50ft/s 228ft/s 4.9G 862ft 7.8s 6s
OK AeroTech I435 235.3oz 68ft/s 237ft/s 10.5G 874ft 7.5s 6s
OK AeroTech I284 236.6oz 55ft/s 225ft/s 6.4G 877ft 7.8s 6s
OK KBA I550 242.1oz 62ft/s 256ft/s 8.9G 918ft 7.7s 7s
OK AeroTech I500 237.3oz 62ft/s 257ft/s 7.7G 985ft 8.0s 7s
OK Cesaroni J335 239.1oz 52ft/s 247ft/s 5.2G 1,001ft 8.4s 6s
OK Loki J396 243.5oz 51ft/s 255ft/s 7.1G 1,004ft 8.3s 7s
OK Cesaroni J316 238.4oz 50ft/s 242ft/s 5.6G 1,010ft 8.5s 6s
OK AeroTech I350 238.7oz 55ft/s 257ft/s 6.4G 1,013ft 8.3s 7s
warningsW Cesaroni I540 238.1oz 67ft/s 269ft/s 8.5G 1,020ft 8.1s 7s
OK AeroTech J420 239.9oz 59ft/s 259ft/s 7.3G 1,026ft 8.3s 7s
OK Cesaroni J381 241.3oz 55ft/s 256ft/s 6.5G 1,035ft 8.4s 6s
OK AeroTech I600 238.2oz 72ft/s 271ft/s 11.4G 1,037ft 8.1s 7s
OK AeroTech J340 237.4oz 56ft/s 252ft/s 8.1G 1,038ft 8.4s 6s
OK Cesaroni J357 238.2oz 54ft/s 257ft/s 6.8G 1,042ft 8.5s 7s
OK AeroTech J350 240.5oz 68ft/s 263ft/s 11.3G 1,061ft 8.3s 7s
OK KBA J740 242.5oz 80ft/s 291ft/s 13.1G 1,087ft 8.2s 7s
OK AeroTech J425 239.3oz 53ft/s 272ft/s 5.8G 1,089ft 8.6s 7s
OK Cesaroni J400 241.8oz 55ft/s 273ft/s 6.1G 1,135ft 8.7s 7s
OK AeroTech J520 244.2oz 81ft/s 291ft/s 14.0G 1,208ft 8.7s 7s
OK AeroTech J500 240.1oz 68ft/s 295ft/s 10.8G 1,230ft 8.8s 7s
OK Loki J528 243.3oz 75ft/s 311ft/s 14.1G 1,281ft 8.8s 8s
OK Cesaroni J330 241.8oz 54ft/s 283ft/s 5.8G 1,286ft 9.3s 7s
OK Cesaroni J410 242.9oz 57ft/s 300ft/s 6.5G 1,321ft 9.4s 7s
OK AeroTech J435 239.0oz 65ft/s 308ft/s 9.4G 1,349ft 9.3s 7s
OK Cesaroni J425 241.7oz 60ft/s 306ft/s 9.0G 1,357ft 9.3s 7s
OK Loki J320 243.5oz 52ft/s 291ft/s 6.8G 1,375ft 9.7s 7s
OK AeroTech J575 249.2oz 77ft/s 324ft/s 11.6G 1,381ft 9.1s 8s
OK Cesaroni J354 244.4oz 54ft/s 299ft/s 6.7G 1,409ft 9.7s 7s
OK Loki J712 243.5oz 74ft/s 336ft/s 12.0G 1,412ft 9.2s 8s
OK Cesaroni J520 247.0oz 62ft/s 337ft/s 8.5G 1,496ft 9.7s 8s
OK Cesaroni J580 253.8oz 65ft/s 353ft/s 8.7G 1,578ft 9.9s 8s
OK Loki J650 257.3oz 71ft/s 373ft/s 11.7G 1,692ft 10.0s 9s
OK Cesaroni J394 250.1oz 52ft/s 355ft/s 5.6G 1,756ft 10.8s 8s
OK AeroTech J825 247.9oz 88ft/s 408ft/s 16.1G 1,800ft 10.2s 9s
OK Cesaroni J595 247.5oz 71ft/s 389ft/s 12.2G 1,845ft 10.5s 9s
OK Cesaroni J600 249.0oz 70ft/s 397ft/s 9.5G 1,864ft 10.6s 9s
OK Cesaroni J420 247.8oz 65ft/s 367ft/s 10.4G 1,878ft 10.8s 8s
OK Cesaroni J453 251.0oz 64ft/s 373ft/s 9.4G 1,884ft 10.8s 8s
OK AeroTech J570 248.8oz 85ft/s 386ft/s 15.6G 1,945ft 10.7s 9s
OK Cesaroni J530 251.5oz 71ft/s 416ft/s 10.5G 2,126ft 11.2s 9s
OK AeroTech J510 255.1oz 75ft/s 428ft/s 13.6G 2,249ft 11.4s 9s
OK Loki J1000 257.3oz 97ft/s 494ft/s 18.5G 2,329ft 11.2s 10s
OK Loki J1026 258.3oz 90ft/s 514ft/s 15.6G 2,425ft 11.5s 10s
OK Loki K1127 258.3oz 92ft/s 513ft/s 18.1G 2,465ft 11.5s 10s
OK Loki K627 260.6oz 79ft/s 536ft/s 12.7G 2,971ft 12.7s 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 (27ft/s)
failedG AeroTech G339 speed at end of launch guide too slow (46ft/s)
failedG AeroTech G67 speed at end of launch guide too slow (11ft/s)
failedG Loki G69 speed at end of launch guide too slow (13ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (5ft/s)
failedG Contrail G234 speed at end of launch guide too slow (42ft/s)
failedG Loki G70 speed at end of launch guide too slow (15ft/s)
failedG Loki G94 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (7ft/s)
failedG Loki G80 speed at end of launch guide too slow (19ft/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 (34ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (15ft/s)
failedG Loki G66 speed at end of launch guide too slow (17ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (10ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (14ft/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 (22ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (14ft/s)
failedG Contrail G123 speed at end of launch guide too slow (29ft/s)
failedG Contrail G100 speed at end of launch guide too slow (27ft/s)
failed5 Cesaroni G50 average thrust fails 5:1 thrust/weight ratio (1:1)
failedA Contrail G300 rocket doesn't reach a safe altitude (33ft)
failedG Contrail H222 speed at end of launch guide too slow (45ft/s)
failedG Contrail H300 speed at end of launch guide too slow (47ft/s)
failedA Contrail H303 rocket doesn't reach a safe altitude (91ft)
failedG AeroTech H73 speed at end of launch guide too slow (11ft/s)
failedG Loki H100 speed at end of launch guide too slow (25ft/s)
failedG AeroTech H283 speed at end of launch guide too slow (46ft/s)
failedG AeroTech H148 speed at end of launch guide too slow (32ft/s)
failedA Contrail H211 rocket doesn't reach a safe altitude (124ft)
failedG AeroTech H130 speed at end of launch guide too slow (37ft/s)
failedA AeroTech H669 rocket doesn't reach a safe altitude (171ft)
failedA Contrail H246 rocket doesn't reach a safe altitude (144ft)
failedG AeroTech H123 speed at end of launch guide too slow (25ft/s)
failedG Contrail H121 speed at end of launch guide too slow (30ft/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 (37ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (24ft/s)
failedG AeroTech H219 speed at end of launch guide too slow (42ft/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 (32ft/s)
failedG Contrail H141 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (26ft/s)
failedA Cesaroni H400 rocket doesn't reach a safe altitude (210ft)
failedG Loki H160 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (26ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (18ft/s)
failedA Contrail H248 rocket doesn't reach a safe altitude (185ft)
failedG Cesaroni H110 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni H225 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (30ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (26ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (21ft/s)
failedA Contrail H277 rocket doesn't reach a safe altitude (238ft)
failedA Contrail H340 rocket doesn't reach a safe altitude (259ft)
failedG AeroTech H170 speed at end of launch guide too slow (32ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (13ft/s)
failedG AeroTech I161 speed at end of launch guide too slow (34ft/s)
failedG AeroTech I218 speed at end of launch guide too slow (42ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni I212 speed at end of launch guide too slow (35ft/s)
failedG AeroTech I225 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni I195 speed at end of launch guide too slow (37ft/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 (34ft/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 I175 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni I236 speed at end of launch guide too slow (41ft/s)
failedG AeroTech I195 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni I223 speed at end of launch guide too slow (37ft/s)
failedG AeroTech I211 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni I287 speed at end of launch guide too slow (43ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (28ft/s)
failedG Loki I110 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni I285 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni I255 speed at end of launch guide too slow (43ft/s)
failedG Contrail I155 speed at end of launch guide too slow (33ft/s)
failedG AMW I297 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I242 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I280 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni I125 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni I216 speed at end of launch guide too slow (42ft/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 (48ft/s)
failedG Cesaroni J270 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni J290 speed at end of launch guide too slow (47ft/s)
failedG AeroTech J270 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni J150 speed at end of launch guide too slow (35ft/s)

G These simulations were run with a launch guide length of 8ft (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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