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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 (717 motors didn't fit, 24 motors failed safety checks). 72 motor had thrust curves available and 139 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:   MadCow Honest John 2.6in glass - HEAVY
Owner: David Cain
Body Diameter: 2.60in
Dry Weight: 1,098g
MMT Diameter: 29.0mm
MMT Length: 20.3cm
CD: 0.31
Web Site: http://www.madcowrocketry.com/2-6-thin-wall-fiberglass-honest-john/

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 Cesaroni F59 1,197g 49ft/s 127ft/s 5.0G 302ft 4.8s 4s
OK Cesaroni F120 1,204g 73ft/s 138ft/s 11.3G 311ft 4.6s 4s
OK AeroTech F50 1,183g 52ft/s 151ft/s 5.3G 443ft 5.7s 4s
OK AeroTech F52 1,220g 52ft/s 153ft/s 5.6G 467ft 5.9s 4s
warningsW Estes F50 1,182g 54ft/s 170ft/s 5.8G 552ft 6.3s 5s
OK AeroTech G54 1,235g 53ft/s 170ft/s 5.8G 559ft 6.4s 5s
OK Cesaroni G88 1,250g 58ft/s 193ft/s 8.5G 620ft 6.6s 6s
OK AeroTech G104 1,234g 68ft/s 198ft/s 9.1G 656ft 6.7s 6s
OK AeroTech G74 1,185g 57ft/s 201ft/s 6.9G 679ft 6.9s 6s
OK AeroTech G53 1,244g 55ft/s 187ft/s 6.1G 700ft 7.2s 5s
OK Cesaroni G80 1,241g 54ft/s 215ft/s 7.1G 764ft 7.3s 6s
warningsW Estes G40 1,221g 49ft/s 196ft/s 5.1G 805ft 7.8s 5s
OK AeroTech G40 1,221g 49ft/s 196ft/s 5.1G 805ft 7.8s 5s
OK AeroTech G77 1,263g 51ft/s 225ft/s 6.6G 846ft 7.8s 6s
OK AeroTech G77 1,221g 56ft/s 236ft/s 7.4G 905ft 8.0s 7s
OK Cesaroni G68 1,254g 50ft/s 231ft/s 6.5G 933ft 8.2s 6s
OK Cesaroni G57 1,244g 53ft/s 224ft/s 6.2G 938ft 8.3s 6s
OK AeroTech G79 1,255g 57ft/s 238ft/s 7.2G 945ft 8.1s 7s
OK AeroTech G79 1,222g 50ft/s 233ft/s 5.9G 946ft 8.3s 6s
OK Cesaroni G83 1,243g 58ft/s 241ft/s 7.2G 954ft 8.1s 7s
OK Cesaroni G250 1,239g 100ft/s 280ft/s 23.0G 1,077ft 8.2s 8s
OK AeroTech G76 1,245g 73ft/s 246ft/s 11.3G 1,089ft 8.6s 7s
OK AeroTech G64 1,249g 63ft/s 244ft/s 7.8G 1,115ft 8.8s 6s
OK Cesaroni G126 1,243g 74ft/s 277ft/s 12.0G 1,138ft 8.6s 8s
OK AeroTech G75 1,229g 58ft/s 264ft/s 7.4G 1,174ft 9.0s 7s
OK Cesaroni G131 1,298g 70ft/s 290ft/s 11.5G 1,229ft 8.9s 8s
OK AeroTech G78 1,223g 58ft/s 275ft/s 7.6G 1,233ft 9.1s 7s
OK AeroTech G125 1,223g 73ft/s 306ft/s 12.1G 1,330ft 9.2s 8s
OK AeroTech G80 1,226g 61ft/s 289ft/s 7.7G 1,351ft 9.5s 8s
OK Cesaroni G106 1,285g 61ft/s 312ft/s 9.4G 1,429ft 9.7s 8s
OK KBA G82 1,329g 52ft/s 298ft/s 7.1G 1,432ft 10.0s 8s
OK KBA G135 1,324g 65ft/s 329ft/s 11.5G 1,505ft 9.8s 9s
OK AeroTech G75 1,331g 49ft/s 304ft/s 5.3G 1,538ft 10.5s 8s
OK Cesaroni G54 1,291g 63ft/s 299ft/s 8.6G 1,747ft 11.0s 8s
OK Cesaroni G118 1,286g 67ft/s 363ft/s 11.4G 1,822ft 10.8s 9s
OK Cesaroni G125 1,292g 72ft/s 365ft/s 11.7G 1,825ft 10.7s 9s
OK Cesaroni H54 1,307g 55ft/s 311ft/s 6.9G 1,843ft 11.4s 8s
OK AeroTech H165 1,300g 82ft/s 377ft/s 14.2G 1,862ft 10.7s 10s
OK Cesaroni H133 1,288g 74ft/s 375ft/s 14.2G 1,904ft 10.9s 10s
OK Cesaroni H87 1,303g 61ft/s 361ft/s 9.0G 1,928ft 11.3s 9s
OK Cesaroni H90 1,261g 67ft/s 366ft/s 11.5G 1,945ft 11.2s 9s
OK Cesaroni H163 1,285g 81ft/s 394ft/s 16.2G 1,994ft 11.1s 10s
OK AeroTech H128 1,304g 79ft/s 394ft/s 13.4G 2,042ft 11.2s 10s
OK Cesaroni H410 1,280g 133ft/s 422ft/s 41.2G 2,052ft 10.9s 10s
OK AeroTech G138 1,246g 69ft/s 407ft/s 15.0G 2,058ft 11.2s 10s
OK AeroTech H238 1,294g 93ft/s 412ft/s 18.1G 2,109ft 11.2s 10s
OK AeroTech H115 1,303g 67ft/s 398ft/s 8.9G 2,139ft 11.6s 10s
OK AeroTech H182 1,305g 80ft/s 511ft/s 14.7G 2,880ft 13.0s 12s
OK AeroTech H195 1,295g 99ft/s 563ft/s 19.0G 3,264ft 13.5s 12s
warningsW,D Estes G80 1,223g 6:1 thrust/weight ratio (no data)

W Motor total weight unknown, lift-off Weight not accurate.

D No simulation data found for this motor.

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 Estes E16 speed at end of launch guide too slow (19ft/s)
failedG AeroTech E23 speed at end of launch guide too slow (32ft/s)
failedG AeroTech E16 speed at end of launch guide too slow (25ft/s)
failedG AeroTech F23 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (35ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (33ft/s)
failedG Estes F15 speed at end of launch guide too slow (16ft/s)
failedG AeroTech F37 speed at end of launch guide too slow (37ft/s)
failedG AeroTech F62 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (36ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (32ft/s)
failedG AeroTech F42 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni F29 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni F31 speed at end of launch guide too slow (33ft/s)
failed5 Estes F26 average thrust fails 5:1 thrust/weight ratio (2:1)
failedG AeroTech F26 speed at end of launch guide too slow (31ft/s)
failedG AeroTech F22 speed at end of launch guide too slow (28ft/s)
failedG Apogee F10 speed at end of launch guide too slow (20ft/s)
failedG AeroTech F25 speed at end of launch guide too slow (42ft/s)
failedG AeroTech F40 speed at end of launch guide too slow (46ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (39ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (32ft/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.

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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