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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 58 motors that fit and appear to have enough thrust (737 motors didn't fit, 16 motors failed safety checks). 74 motor had thrust curves available and 156 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:   Zephyr rebuilt heavy 38mm
Owner: Clint Goforth
Body Diameter: 4.00in
Dry Weight: 55.8oz
MMT Diameter: 38.0mm
MMT Length: 11.00in
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 Loki G70 64.3oz 49ft/s 154ft/s 4.7G 470ft 5.9s 4s
OK Loki G80 64.7oz 52ft/s 163ft/s 5.2G 488ft 5.9s 4s
OK AeroTech G339 62.1oz 103ft/s 197ft/s 20.8G 501ft 5.5s 5s
OK Loki G94 64.2oz 56ft/s 175ft/s 6.4G 520ft 6.0s 5s
OK Loki G66 64.6oz 52ft/s 171ft/s 5.5G 583ft 6.6s 4s
OK Cesaroni G185 62.4oz 70ft/s 213ft/s 10.8G 591ft 6.1s 5s
OK Cesaroni G115 62.6oz 56ft/s 215ft/s 6.5G 667ft 6.7s 5s
OK Loki H100 67.6oz 56ft/s 263ft/s 6.7G 1,024ft 8.1s 6s
warningsW AeroTech H283 64.5oz 93ft/s 326ft/s 17.7G 1,086ft 7.8s 7s
OK AeroTech H148 66.7oz 69ft/s 306ft/s 9.5G 1,145ft 8.3s 7s
OK AeroTech H130 64.1oz 81ft/s 299ft/s 13.6G 1,163ft 8.2s 7s
OK AeroTech H669 64.6oz 144ft/s 384ft/s 60.6G 1,227ft 8.0s 8s
OK AeroTech H123 65.5oz 59ft/s 294ft/s 7.2G 1,251ft 8.9s 6s
OK AeroTech H100 65.0oz 54ft/s 298ft/s 6.1G 1,254ft 8.9s 7s
OK Loki H90 67.6oz 58ft/s 287ft/s 6.8G 1,273ft 9.0s 6s
OK Cesaroni H123 66.2oz 54ft/s 331ft/s 7.0G 1,289ft 8.9s 7s
OK Loki H144 67.6oz 78ft/s 328ft/s 12.2G 1,304ft 8.6s 7s
OK Loki H125 67.8oz 70ft/s 315ft/s 9.9G 1,311ft 8.8s 7s
OK AeroTech H219 65.0oz 87ft/s 365ft/s 15.2G 1,315ft 8.5s 7s
OK Cesaroni H143 68.0oz 57ft/s 341ft/s 7.5G 1,317ft 9.0s 7s
OK AeroTech H242 65.1oz 77ft/s 368ft/s 12.1G 1,382ft 8.8s 7s
OK Loki H160 67.6oz 84ft/s 356ft/s 14.4G 1,409ft 8.8s 7s
OK Cesaroni H400 65.8oz 104ft/s 425ft/s 23.2G 1,436ft 8.6s 8s
OK Cesaroni H120 66.2oz 58ft/s 353ft/s 7.0G 1,468ft 9.5s 7s
OK Cesaroni H110 67.2oz 52ft/s 347ft/s 5.5G 1,500ft 9.7s 7s
OK Cesaroni H125 66.1oz 57ft/s 369ft/s 7.1G 1,508ft 9.5s 7s
OK Cesaroni H152 66.3oz 65ft/s 389ft/s 10.5G 1,582ft 9.5s 8s
OK Cesaroni H225 62.6oz 82ft/s 439ft/s 13.8G 1,595ft 9.2s 8s
OK AeroTech H178 67.2oz 64ft/s 411ft/s 10.3G 1,602ft 9.5s 8s
OK Cesaroni H100 67.3oz 52ft/s 355ft/s 5.3G 1,609ft 10.1s 7s
OK AeroTech H550 66.9oz 131ft/s 518ft/s 34.1G 1,747ft 9.2s 9s
OK AeroTech H550 67.1oz 131ft/s 512ft/s 33.8G 1,747ft 9.2s 9s
warningsW Cesaroni H565 68.5oz 123ft/s 520ft/s 31.7G 1,766ft 9.3s 9s
OK AeroTech I218 68.9oz 84ft/s 447ft/s 13.9G 1,769ft 9.7s 8s
OK AeroTech H999 67.4oz 173ft/s 542ft/s 84.8G 1,772ft 9.1s 9s
OK AeroTech H170 67.4oz 70ft/s 432ft/s 9.8G 1,796ft 9.9s 8s
OK AeroTech I180 69.3oz 95ft/s 420ft/s 17.8G 1,815ft 9.8s 8s
OK AeroTech I161 68.7oz 71ft/s 428ft/s 10.4G 1,863ft 10.1s 8s
OK Cesaroni I180 69.6oz 66ft/s 460ft/s 9.6G 1,885ft 10.1s 8s
OK AeroTech I175 68.0oz 79ft/s 430ft/s 12.3G 1,886ft 10.2s 8s
OK AeroTech I140 68.3oz 65ft/s 417ft/s 8.4G 1,921ft 10.4s 8s
OK AeroTech I245 68.6oz 100ft/s 483ft/s 20.6G 1,942ft 9.8s 8s
OK AeroTech I225 72.9oz 70ft/s 474ft/s 12.4G 1,949ft 10.1s 8s
OK AeroTech I357 67.8oz 97ft/s 507ft/s 19.1G 1,953ft 9.8s 8s
OK Cesaroni I212 72.5oz 68ft/s 491ft/s 11.2G 1,984ft 10.3s 9s
OK Cesaroni I566 69.3oz 116ft/s 592ft/s 31.0G 2,020ft 9.7s 9s
OK AeroTech I154 73.1oz 58ft/s 420ft/s 7.3G 2,111ft 11.1s 8s
OK Cesaroni I345 69.7oz 98ft/s 585ft/s 19.1G 2,180ft 10.2s 9s
OK Cesaroni I195 70.5oz 72ft/s 511ft/s 11.1G 2,188ft 10.7s 9s
OK AeroTech I285 73.1oz 90ft/s 556ft/s 17.6G 2,215ft 10.4s 9s
OK AeroTech I1299 70.6oz 192ft/s 690ft/s 76.7G 2,227ft 9.9s 10s
OK Cesaroni I170 69.6oz 71ft/s 523ft/s 10.6G 2,250ft 10.8s 8s
OK Cesaroni I175 71.2oz 67ft/s 511ft/s 8.6G 2,267ft 11.0s 9s
OK Cesaroni I236 69.9oz 82ft/s 552ft/s 15.0G 2,277ft 10.7s 9s
OK AeroTech I211 71.8oz 84ft/s 532ft/s 15.1G 2,336ft 10.8s 8s
OK AeroTech I300 71.3oz 99ft/s 584ft/s 22.5G 2,337ft 10.5s 9s
OK AeroTech I59 72.9oz 58ft/s 324ft/s 7.2G 2,872ft 14.2s 6s
OK Cesaroni J357 76.9oz 101ft/s 790ft/s 23.1G 3,175ft 11.7s 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 AeroTech G67 speed at end of launch guide too slow (45ft/s)
failedG Loki G69 speed at end of launch guide too slow (47ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni G46 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (44ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (33ft/s)
failedG AeroTech H73 speed at end of launch guide too slow (41ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (47ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (42ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (34ft/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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