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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 16 motors that fit and appear to have enough thrust (647 motors didn't fit, 140 motors failed safety checks). 156 motor had thrust curves available and 324 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:   Mad dog xl 38mmt
Owner: Jim Fields
Body Diameter: 4.00in
Dry Weight: 20.00lb
MMT Diameter: 38.0mm
MMT Length: 22.00in
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 I1299 20.93lb 75ft/s 137ft/s 15.2G 307ft 4.5s 4s
OK Loki I405 21.20lb 49ft/s 135ft/s 7.5G 375ft 5.2s 4s
OK AeroTech I435 21.14lb 48ft/s 158ft/s 7.0G 493ft 6.0s 5s
OK AeroTech I600 21.33lb 52ft/s 183ft/s 7.6G 618ft 6.6s 5s
OK AeroTech J350 21.47lb 48ft/s 177ft/s 7.6G 628ft 6.8s 5s
OK KBA J740 21.60lb 56ft/s 199ft/s 9.1G 670ft 6.8s 6s
OK AeroTech J520 21.67lb 54ft/s 187ft/s 8.3G 686ft 7.0s 6s
OK AeroTech J500 21.44lb 49ft/s 201ft/s 7.3G 764ft 7.4s 6s
OK Loki J528 21.64lb 53ft/s 214ft/s 9.6G 824ft 7.6s 6s
OK AeroTech J575 22.02lb 55ft/s 226ft/s 7.9G 921ft 8.0s 7s
OK Loki J712 21.66lb 53ft/s 232ft/s 8.1G 939ft 8.1s 7s
OK AeroTech J825 21.93lb 64ft/s 287ft/s 11.0G 1,344ft 9.5s 8s
OK Cesaroni J595 21.91lb 50ft/s 275ft/s 8.3G 1,355ft 9.8s 8s
OK Cesaroni J600 22.00lb 49ft/s 280ft/s 6.5G 1,375ft 9.9s 8s
OK AeroTech J570 21.99lb 61ft/s 277ft/s 10.8G 1,465ft 10.1s 8s
OK Cesaroni J530 22.15lb 51ft/s 301ft/s 7.1G 1,660ft 10.8s 9s

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 (14ft/s)
failed5 AeroTech G339 average thrust fails 5:1 thrust/weight ratio (3:1)
failed5 AeroTech G67 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Loki G69 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 AeroTech G61 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Contrail G234 speed at end of launch guide too slow (26ft/s)
failed5 Loki G70 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Loki G94 speed at end of launch guide too slow (7ft/s)
failed5 Cesaroni G69 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Loki G80 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Cesaroni G46 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Cesaroni G185 speed at end of launch guide too slow (22ft/s)
failed5 Cesaroni G79 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Loki G66 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Cesaroni G60 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 AeroTech G69 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Cesaroni G58 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Cesaroni G115 speed at end of launch guide too slow (11ft/s)
failed5 Cesaroni G78 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Contrail G123 speed at end of launch guide too slow (17ft/s)
failedG Contrail G100 speed at end of launch guide too slow (15ft/s)
failed5 Cesaroni G50 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Contrail G300 average thrust fails 5:1 thrust/weight ratio (3:1)
failedG Contrail H222 speed at end of launch guide too slow (30ft/s)
failedG Contrail H300 speed at end of launch guide too slow (31ft/s)
failedG Contrail H303 speed at end of launch guide too slow (35ft/s)
failed5 AeroTech H73 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Loki H100 speed at end of launch guide too slow (15ft/s)
failedG AeroTech H283 speed at end of launch guide too slow (31ft/s)
failedG AeroTech H148 speed at end of launch guide too slow (20ft/s)
failedG Contrail H211 speed at end of launch guide too slow (35ft/s)
failedG AeroTech H130 speed at end of launch guide too slow (24ft/s)
failedA AeroTech H669 rocket doesn't reach a safe altitude (80ft)
failedG Contrail H246 speed at end of launch guide too slow (35ft/s)
failedG AeroTech H123 speed at end of launch guide too slow (14ft/s)
failedG Contrail H121 speed at end of launch guide too slow (18ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (12ft/s)
failedG AeroTech H242 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (15ft/s)
failedG AeroTech H219 speed at end of launch guide too slow (28ft/s)
failedG Loki H90 speed at end of launch guide too slow (12ft/s)
failedG Loki H144 speed at end of launch guide too slow (23ft/s)
failedG Loki H125 speed at end of launch guide too slow (19ft/s)
failedG Contrail H141 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (16ft/s)
failedG Cesaroni H400 speed at end of launch guide too slow (38ft/s)
failedG Loki H160 speed at end of launch guide too slow (27ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (15ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (7ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (11ft/s)
failedG Cesaroni H225 speed at end of launch guide too slow (26ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (19ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (20ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (15ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (10ft/s)
failedG AeroTech H550 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni H565 speed at end of launch guide too slow (46ft/s)
failedA AeroTech H999 rocket doesn't reach a safe altitude (175ft)
failedG AeroTech H170 speed at end of launch guide too slow (20ft/s)
failed5 AeroTech H45 average thrust fails 5:1 thrust/weight ratio (0:1)
failedG AeroTech H550 speed at end of launch guide too slow (47ft/s)
failedG AeroTech I180 speed at end of launch guide too slow (32ft/s)
failedG AeroTech I161 speed at end of launch guide too slow (22ft/s)
failedG AeroTech I218 speed at end of launch guide too slow (28ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (19ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (21ft/s)
failedG AeroTech I357 speed at end of launch guide too slow (33ft/s)
failedG AeroTech I245 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni I212 speed at end of launch guide too slow (23ft/s)
failedG AeroTech I225 speed at end of launch guide too slow (25ft/s)
failedG Cesaroni I195 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni I566 speed at end of launch guide too slow (45ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (15ft/s)
failedG Cesaroni I170 speed at end of launch guide too slow (22ft/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 (34ft/s)
failedG Loki I316 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni I175 speed at end of launch guide too slow (20ft/s)
failedG Cesaroni I236 speed at end of launch guide too slow (27ft/s)
failedA Cesaroni I800 rocket doesn't reach a safe altitude (278ft)
failedG AeroTech I285 speed at end of launch guide too slow (34ft/s)
failedG AeroTech I195 speed at end of launch guide too slow (30ft/s)
failedG AeroTech I300 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni I223 speed at end of launch guide too slow (24ft/s)
failedG AeroTech I211 speed at end of launch guide too slow (29ft/s)
failedG AeroTech I305 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni I287 speed at end of launch guide too slow (29ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (17ft/s)
failedG Loki I110 speed at end of launch guide too slow (18ft/s)
failedG Loki I210 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni I285 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni I255 speed at end of launch guide too slow (29ft/s)
failedG Loki I377 speed at end of launch guide too slow (44ft/s)
failedG Loki I430 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni I303 speed at end of launch guide too slow (33ft/s)
failedG AeroTech I366 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I327 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni I470 speed at end of launch guide too slow (42ft/s)
failedG AMW I297 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni I242 speed at end of launch guide too slow (26ft/s)
failedG KBA I301 speed at end of launch guide too slow (33ft/s)
failedG AeroTech I280 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni I125 speed at end of launch guide too slow (19ft/s)
failedG AeroTech I364 speed at end of launch guide too slow (34ft/s)
failedG KBA I550 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni I350 speed at end of launch guide too slow (34ft/s)
failedG AeroTech I284 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I500 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni I540 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I350 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni I216 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni J94 speed at end of launch guide too slow (13ft/s)
failedG KBA J520 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni J285 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni J335 speed at end of launch guide too slow (35ft/s)
failedG Loki J396 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni J270 speed at end of launch guide too slow (28ft/s)
failedG AeroTech J340 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni J316 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni J357 speed at end of launch guide too slow (37ft/s)
failedG AeroTech J420 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni J381 speed at end of launch guide too slow (39ft/s)
failedG AeroTech J425 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni J290 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni J400 speed at end of launch guide too slow (38ft/s)
failedG AeroTech J270 speed at end of launch guide too slow (31ft/s)
failedG Loki J320 speed at end of launch guide too slow (37ft/s)
failedG Loki J326 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J330 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni J410 speed at end of launch guide too slow (40ft/s)
failedG AeroTech J435 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni J425 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni J354 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni J520 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J580 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni J150 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni J394 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni J420 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni J453 speed at end of launch guide too slow (44ft/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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