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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 43 motors that fit and appear to have enough thrust (623 motors didn't fit, 125 motors failed safety checks). 168 motor had thrust curves available and 346 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:   Darkstar 4 DD 38mm 6ft rod
Owner: Kevin Dunn
Body Diameter: 4.00in
Dry Weight: 15.00lb
MMT Diameter: 38.0mm
MMT Length: 36.00in
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 AeroTech H550 15.71lb 56ft/s 127ft/s 8.2G 279ft 4.4s 4s
OK AeroTech H550 15.70lb 56ft/s 127ft/s 8.3G 280ft 4.4s 4s
OK Contrail I500 16.76lb 63ft/s 123ft/s 12.6G 284ft 4.4s 4s
warningsW Cesaroni H565 15.80lb 54ft/s 130ft/s 8.3G 286ft 4.5s 4s
OK AeroTech H999 15.73lb 74ft/s 138ft/s 21.9G 305ft 4.5s 4s
OK Cesaroni I566 15.85lb 53ft/s 150ft/s 8.0G 377ft 5.1s 4s
OK Contrail I747 16.85lb 87ft/s 171ft/s 24.3G 476ft 5.5s 5s
OK Cesaroni I800 16.01lb 64ft/s 173ft/s 11.7G 480ft 5.7s 5s
OK AeroTech I1299 15.93lb 88ft/s 184ft/s 20.3G 521ft 5.8s 5s
OK Loki I316 16.19lb 48ft/s 166ft/s 6.0G 557ft 6.4s 5s
OK Loki I405 16.20lb 57ft/s 187ft/s 10.1G 643ft 6.7s 5s
OK Loki I377 16.23lb 51ft/s 190ft/s 8.1G 687ft 7.0s 6s
OK Cesaroni I470 16.09lb 49ft/s 208ft/s 6.8G 739ft 7.2s 6s
OK AeroTech I435 16.14lb 56ft/s 217ft/s 9.5G 833ft 7.6s 6s
OK KBA I550 16.57lb 51ft/s 234ft/s 8.2G 887ft 7.8s 7s
OK AeroTech I500 16.27lb 49ft/s 236ft/s 7.0G 954ft 8.1s 7s
OK AeroTech J420 16.43lb 49ft/s 238ft/s 6.6G 997ft 8.4s 7s
warningsW Cesaroni I540 16.32lb 55ft/s 247ft/s 7.7G 997ft 8.3s 7s
OK AeroTech I600 16.33lb 62ft/s 249ft/s 10.3G 1,020ft 8.3s 7s
OK AeroTech J350 16.47lb 55ft/s 243ft/s 10.2G 1,041ft 8.5s 7s
OK KBA J740 16.60lb 63ft/s 267ft/s 12.2G 1,083ft 8.4s 8s
OK AeroTech J520 16.70lb 66ft/s 270ft/s 12.7G 1,220ft 9.0s 8s
OK AeroTech J500 16.44lb 56ft/s 274ft/s 9.8G 1,242ft 9.2s 8s
OK Loki J528 16.64lb 62ft/s 288ft/s 12.8G 1,313ft 9.3s 8s
OK AeroTech J435 16.38lb 54ft/s 286ft/s 8.4G 1,381ft 9.7s 8s
OK Cesaroni J425 16.54lb 50ft/s 284ft/s 8.1G 1,388ft 9.8s 8s
OK AeroTech J575 17.02lb 63ft/s 302ft/s 10.5G 1,441ft 9.7s 8s
OK Loki J712 16.66lb 60ft/s 312ft/s 10.9G 1,477ft 9.8s 9s
OK Cesaroni J520 16.87lb 51ft/s 314ft/s 7.7G 1,571ft 10.3s 9s
OK Cesaroni J580 17.30lb 52ft/s 330ft/s 8.2G 1,679ft 10.6s 9s
OK Loki J650 17.52lb 59ft/s 350ft/s 11.1G 1,838ft 10.9s 10s
OK AeroTech J825 16.93lb 71ft/s 380ft/s 14.6G 2,005ft 11.2s 10s
OK Cesaroni J595 16.91lb 59ft/s 368ft/s 11.1G 2,045ft 11.5s 10s
OK Cesaroni J420 16.93lb 54ft/s 350ft/s 9.4G 2,063ft 11.8s 9s
OK Cesaroni J600 17.00lb 58ft/s 374ft/s 8.7G 2,071ft 11.6s 10s
OK Cesaroni J453 17.13lb 53ft/s 356ft/s 8.5G 2,072ft 11.8s 9s
OK AeroTech J570 16.99lb 69ft/s 369ft/s 14.2G 2,180ft 11.8s 10s
OK Cesaroni J530 17.15lb 59ft/s 400ft/s 9.5G 2,433ft 12.5s 10s
OK AeroTech J510 17.38lb 62ft/s 413ft/s 12.4G 2,608ft 12.9s 10s
OK Loki J1000 17.52lb 78ft/s 467ft/s 16.9G 2,783ft 12.9s 12s
OK Loki J1026 17.58lb 74ft/s 485ft/s 14.6G 2,928ft 13.3s 12s
OK Loki K1127 17.58lb 79ft/s 488ft/s 17.1G 2,997ft 13.4s 12s
OK Loki K627 17.72lb 65ft/s 528ft/s 11.6G 3,735ft 15.1s 13s

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 (22ft/s)
failedG AeroTech G339 speed at end of launch guide too slow (39ft/s)
failedG AeroTech G67 speed at end of launch guide too slow (6ft/s)
failedG Loki G69 speed at end of launch guide too slow (8ft/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 (37ft/s)
failedG Loki G70 speed at end of launch guide too slow (10ft/s)
failedG Loki G94 speed at end of launch guide too slow (18ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (2ft/s)
failedG Loki G80 speed at end of launch guide too slow (14ft/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 (27ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (11ft/s)
failedG Loki G66 speed at end of launch guide too slow (13ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (5ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (10ft/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 (17ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (10ft/s)
failedG Contrail G123 speed at end of launch guide too slow (24ft/s)
failedG Contrail G100 speed at end of launch guide too slow (22ft/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 (37ft/s)
failedG Contrail H222 speed at end of launch guide too slow (37ft/s)
failedG Contrail H300 speed at end of launch guide too slow (40ft/s)
failedG Contrail H303 speed at end of launch guide too slow (45ft/s)
failedG AeroTech H73 speed at end of launch guide too slow (8ft/s)
failedG Loki H100 speed at end of launch guide too slow (20ft/s)
failedG AeroTech H283 speed at end of launch guide too slow (38ft/s)
failedG AeroTech H148 speed at end of launch guide too slow (26ft/s)
failedG Contrail H211 speed at end of launch guide too slow (44ft/s)
failedG AeroTech H130 speed at end of launch guide too slow (30ft/s)
failedA AeroTech H669 rocket doesn't reach a safe altitude (144ft)
failedG Contrail H246 speed at end of launch guide too slow (42ft/s)
failedG AeroTech H123 speed at end of launch guide too slow (20ft/s)
failedG Contrail H121 speed at end of launch guide too slow (25ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (18ft/s)
failedG AeroTech H242 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (19ft/s)
failedG AeroTech H219 speed at end of launch guide too slow (34ft/s)
failedG Loki H90 speed at end of launch guide too slow (19ft/s)
failedG Loki H144 speed at end of launch guide too slow (30ft/s)
failedG Loki H125 speed at end of launch guide too slow (25ft/s)
failedG Contrail H141 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (21ft/s)
failedG Cesaroni H400 speed at end of launch guide too slow (45ft/s)
failedG Loki H160 speed at end of launch guide too slow (33ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (20ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (14ft/s)
failedG Contrail H248 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (17ft/s)
failedG Cesaroni H225 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (24ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (20ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (16ft/s)
failedG Contrail H277 speed at end of launch guide too slow (42ft/s)
failedG Contrail H340 speed at end of launch guide too slow (43ft/s)
failedG AeroTech H170 speed at end of launch guide too slow (26ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (9ft/s)
failedG AeroTech I180 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I161 speed at end of launch guide too slow (27ft/s)
failedG AeroTech I218 speed at end of launch guide too slow (34ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (25ft/s)
failedG AeroTech I357 speed at end of launch guide too slow (40ft/s)
failedG AeroTech I245 speed at end of launch guide too slow (43ft/s)
failedG Contrail I221 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni I212 speed at end of launch guide too slow (28ft/s)
failedG AeroTech I225 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni I195 speed at end of launch guide too slow (29ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (21ft/s)
failedG Cesaroni I170 speed at end of launch guide too slow (28ft/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 (40ft/s)
failedG Cesaroni I175 speed at end of launch guide too slow (26ft/s)
failedG Cesaroni I236 speed at end of launch guide too slow (33ft/s)
failedG AeroTech I285 speed at end of launch guide too slow (40ft/s)
failedG AeroTech I195 speed at end of launch guide too slow (36ft/s)
failedG AeroTech I300 speed at end of launch guide too slow (41ft/s)
failedG Contrail I250 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni I223 speed at end of launch guide too slow (30ft/s)
failedG AeroTech I211 speed at end of launch guide too slow (35ft/s)
failedG AeroTech I305 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni I287 speed at end of launch guide too slow (35ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (22ft/s)
failedG Loki I110 speed at end of launch guide too slow (23ft/s)
failedG Loki I210 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni I285 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni I255 speed at end of launch guide too slow (35ft/s)
failedG Loki I430 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni I303 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I366 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I327 speed at end of launch guide too slow (42ft/s)
failedG Contrail I155 speed at end of launch guide too slow (27ft/s)
failedG AMW I297 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni I242 speed at end of launch guide too slow (32ft/s)
failedG KBA I301 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I280 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni I125 speed at end of launch guide too slow (25ft/s)
failedG AeroTech I364 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni I350 speed at end of launch guide too slow (41ft/s)
failedG AeroTech I284 speed at end of launch guide too slow (45ft/s)
failedG AeroTech I350 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni I216 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni J94 speed at end of launch guide too slow (19ft/s)
failedG Cesaroni J285 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni J335 speed at end of launch guide too slow (42ft/s)
failedG Loki J396 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni J270 speed at end of launch guide too slow (34ft/s)
failedG AeroTech J340 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni J316 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni J357 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J381 speed at end of launch guide too slow (46ft/s)
failedG AeroTech J425 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni J290 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni J400 speed at end of launch guide too slow (46ft/s)
failedG AeroTech J270 speed at end of launch guide too slow (37ft/s)
failedG Loki J320 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J330 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J410 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni J354 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J150 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni J394 speed at end of launch guide too slow (42ft/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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