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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 50 motors that fit and appear to have enough thrust (737 motors didn't fit, 4 motors failed safety checks). 54 motor had thrust curves available and 114 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:   Chopped 38mm
Owner: Jim Lane
Body Diameter: 4.00in
Dry Weight: 40.0oz
MMT Diameter: 38.0mm
MMT Length: 8.00in
CD: 0.44

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 Loki G69 48.5oz 56ft/s 205ft/s 6.3G 694ft 6.8s 5s
OK AeroTech G61 46.8oz 50ft/s 203ft/s 5.2G 710ft 7.0s 5s
OK AeroTech G67 47.1oz 54ft/s 215ft/s 5.9G 714ft 7.0s 5s
OK Loki G70 48.5oz 58ft/s 217ft/s 6.5G 766ft 7.2s 5s
OK Loki G80 49.0oz 61ft/s 226ft/s 7.2G 783ft 7.1s 6s
OK AeroTech G339 46.4oz 121ft/s 268ft/s 28.3G 784ft 6.7s 6s
OK Loki G94 48.5oz 66ft/s 241ft/s 8.8G 826ft 7.2s 6s
OK Cesaroni G69 46.9oz 50ft/s 239ft/s 5.6G 878ft 7.8s 6s
OK Cesaroni G79 48.0oz 48ft/s 254ft/s 6.0G 885ft 7.7s 6s
OK Cesaroni G185 46.6oz 81ft/s 291ft/s 14.8G 917ft 7.3s 7s
OK Loki G66 48.8oz 61ft/s 238ft/s 7.5G 924ft 7.8s 6s
OK AeroTech G69 47.1oz 51ft/s 259ft/s 5.3G 959ft 8.0s 6s
OK Cesaroni G60 47.3oz 52ft/s 255ft/s 5.5G 982ft 8.1s 6s
OK Cesaroni G78 46.9oz 53ft/s 274ft/s 9.0G 1,032ft 8.2s 6s
OK Cesaroni G115 46.9oz 64ft/s 297ft/s 9.1G 1,032ft 7.9s 7s
OK AeroTech H73 50.9oz 48ft/s 300ft/s 5.1G 1,342ft 9.5s 6s
OK Loki H100 51.8oz 63ft/s 352ft/s 8.9G 1,473ft 9.3s 7s
warningsW AeroTech H283 48.7oz 109ft/s 435ft/s 23.7G 1,522ft 8.8s 8s
OK AeroTech H148 50.9oz 78ft/s 407ft/s 12.7G 1,611ft 9.4s 8s
OK AeroTech H130 48.4oz 92ft/s 399ft/s 18.3G 1,628ft 9.3s 8s
OK AeroTech H669 48.9oz 169ft/s 512ft/s 80.5G 1,674ft 9.0s 9s
OK AeroTech H123 49.7oz 68ft/s 393ft/s 9.8G 1,756ft 9.9s 7s
OK AeroTech H100 49.2oz 61ft/s 399ft/s 8.3G 1,766ft 10.0s 8s
OK Loki H90 51.8oz 68ft/s 381ft/s 9.2G 1,790ft 10.2s 8s
OK Loki H144 51.9oz 88ft/s 431ft/s 16.2G 1,791ft 9.7s 8s
OK AeroTech H219 49.2oz 99ft/s 490ft/s 20.5G 1,792ft 9.5s 8s
OK Cesaroni H123 50.5oz 62ft/s 441ft/s 9.4G 1,796ft 10.0s 8s
OK Loki H125 52.1oz 81ft/s 414ft/s 13.2G 1,812ft 10.0s 8s
OK Cesaroni H143 52.2oz 63ft/s 453ft/s 10.0G 1,819ft 10.0s 8s
OK AeroTech H242 49.3oz 88ft/s 488ft/s 16.3G 1,880ft 9.8s 8s
OK Loki H160 51.8oz 100ft/s 465ft/s 19.0G 1,908ft 9.8s 8s
OK Cesaroni H400 50.0oz 115ft/s 564ft/s 30.9G 1,922ft 9.6s 9s
OK AeroTech H112 53.4oz 55ft/s 403ft/s 6.4G 1,985ft 10.9s 8s
OK Cesaroni H120 50.4oz 67ft/s 468ft/s 9.6G 2,008ft 10.4s 8s
OK Cesaroni H125 50.3oz 63ft/s 488ft/s 9.5G 2,051ft 10.5s 8s
OK Cesaroni H110 51.5oz 59ft/s 459ft/s 7.5G 2,056ft 10.7s 8s
OK Cesaroni H225 46.8oz 95ft/s 587ft/s 18.8G 2,111ft 10.0s 9s
OK Cesaroni H152 50.5oz 76ft/s 513ft/s 14.1G 2,124ft 10.4s 9s
OK AeroTech H178 51.4oz 73ft/s 542ft/s 13.7G 2,133ft 10.4s 9s
OK Cesaroni H100 51.5oz 60ft/s 468ft/s 7.3G 2,192ft 11.1s 8s
OK AeroTech H550 51.1oz 149ft/s 681ft/s 45.1G 2,248ft 10.0s 9s
OK AeroTech H999 51.7oz 195ft/s 712ft/s 111.1G 2,278ft 9.9s 10s
OK AeroTech I218 53.1oz 95ft/s 581ft/s 18.4G 2,312ft 10.5s 9s
OK AeroTech H170 51.6oz 78ft/s 564ft/s 13.0G 2,355ft 10.8s 9s
OK AeroTech I180 53.6oz 109ft/s 540ft/s 23.4G 2,365ft 10.6s 9s
OK AeroTech I161 52.9oz 82ft/s 553ft/s 13.8G 2,432ft 10.9s 9s
OK AeroTech I245 52.9oz 114ft/s 621ft/s 27.1G 2,491ft 10.6s 9s
OK AeroTech H45 52.9oz 49ft/s 376ft/s 4.8G 2,499ft 12.7s 7s
OK AeroTech I357 52.1oz 111ft/s 657ft/s 25.2G 2,502ft 10.6s 9s
OK AeroTech I140 52.6oz 73ft/s 539ft/s 11.3G 2,515ft 11.2s 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 Cesaroni G46 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (39ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (38ft/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.)

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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