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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 (722 motors didn't fit, 19 motors failed safety checks). 67 motor had thrust curves available and 134 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:   Who's Your Daddy? 29mm
Owner: Jim Lane
Body Diameter: 4.00in
Dry Weight: 27.0oz
MMT Diameter: 29.0mm
MMT Length: 7.50in
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 F62 30.8oz 57ft/s 164ft/s 6.4G 383ft 5.0s 4s
OK Cesaroni F120 30.7oz 85ft/s 192ft/s 15.6G 412ft 5.0s 4s
OK AeroTech F42 29.7oz 58ft/s 162ft/s 7.3G 419ft 5.3s 4s
OK Cesaroni F59 30.5oz 59ft/s 178ft/s 7.3G 421ft 5.2s 4s
OK AeroTech F50 30.0oz 62ft/s 205ft/s 7.7G 550ft 5.8s 4s
OK AeroTech F25 30.2oz 52ft/s 168ft/s 5.9G 560ft 6.2s 4s
OK AeroTech F52 31.3oz 63ft/s 204ft/s 8.1G 571ft 6.0s 5s
OK AeroTech F40 31.5oz 56ft/s 195ft/s 6.8G 615ft 6.3s 4s
warningsW Estes F50 29.9oz 63ft/s 225ft/s 8.3G 633ft 6.1s 5s
OK AeroTech G54 31.8oz 63ft/s 222ft/s 8.1G 641ft 6.2s 5s
OK Cesaroni G88 32.4oz 67ft/s 256ft/s 11.9G 665ft 6.2s 5s
OK AeroTech G104 31.8oz 81ft/s 260ft/s 12.8G 684ft 6.2s 5s
OK AeroTech G38 31.4oz 48ft/s 201ft/s 5.0G 699ft 6.9s 4s
OK AeroTech G74 30.1oz 68ft/s 268ft/s 9.7G 707ft 6.4s 5s
OK AeroTech G53 32.1oz 66ft/s 236ft/s 8.7G 741ft 6.7s 5s
OK Cesaroni G80 32.1oz 63ft/s 281ft/s 10.1G 763ft 6.6s 5s
OK AeroTech G77 32.8oz 61ft/s 289ft/s 8.6G 818ft 6.9s 5s
warningsW Estes G40 31.3oz 59ft/s 242ft/s 7.4G 825ft 7.1s 5s
OK AeroTech G40 31.3oz 59ft/s 242ft/s 7.4G 825ft 7.1s 5s
OK AeroTech G77 31.3oz 67ft/s 303ft/s 9.8G 838ft 6.8s 6s
OK AeroTech G79 32.5oz 69ft/s 299ft/s 9.8G 866ft 6.9s 5s
OK Cesaroni G83 32.1oz 70ft/s 304ft/s 10.2G 871ft 6.9s 6s
OK Cesaroni G68 32.5oz 60ft/s 287ft/s 9.2G 880ft 7.1s 5s
OK AeroTech G79 31.4oz 58ft/s 291ft/s 8.0G 880ft 7.1s 5s
OK Cesaroni G250 32.0oz 117ft/s 371ft/s 30.9G 881ft 6.6s 6s
OK Cesaroni G57 32.1oz 63ft/s 272ft/s 8.9G 893ft 7.2s 5s
OK Cesaroni G126 32.1oz 86ft/s 353ft/s 16.8G 938ft 6.9s 6s
OK AeroTech G76 32.2oz 86ft/s 295ft/s 15.8G 943ft 7.0s 5s
OK AeroTech G64 32.3oz 72ft/s 289ft/s 11.0G 973ft 7.3s 5s
OK Cesaroni G131 34.1oz 80ft/s 366ft/s 14.6G 983ft 7.1s 6s
OK AeroTech G75 31.6oz 67ft/s 318ft/s 10.5G 986ft 7.3s 5s
OK AeroTech G78 31.4oz 69ft/s 338ft/s 10.5G 1,001ft 7.3s 6s
OK AeroTech G125 31.4oz 84ft/s 387ft/s 15.6G 1,012ft 7.0s 6s
OK AeroTech G80 31.5oz 73ft/s 348ft/s 10.9G 1,056ft 7.4s 6s
OK Cesaroni G106 33.6oz 69ft/s 384ft/s 13.0G 1,087ft 7.4s 6s
OK AeroTech G75 35.2oz 57ft/s 348ft/s 6.9G 1,190ft 8.1s 6s
OK AeroTech H165 34.1oz 95ft/s 455ft/s 18.8G 1,221ft 7.5s 6s
OK Cesaroni H410 33.4oz 149ft/s 541ft/s 54.1G 1,227ft 7.2s 7s
OK Cesaroni G125 33.9oz 85ft/s 431ft/s 16.2G 1,230ft 7.7s 6s
OK Cesaroni G118 33.6oz 81ft/s 428ft/s 15.7G 1,236ft 7.7s 6s
OK Cesaroni H133 33.7oz 87ft/s 440ft/s 19.5G 1,256ft 7.7s 6s
OK Cesaroni H163 33.6oz 94ft/s 475ft/s 22.3G 1,268ft 7.6s 7s
OK AeroTech G138 32.2oz 83ft/s 493ft/s 16.9G 1,281ft 7.6s 7s
OK AeroTech H238 33.9oz 105ft/s 494ft/s 23.5G 1,291ft 7.6s 7s
OK AeroTech H128 34.3oz 92ft/s 461ft/s 17.9G 1,295ft 7.7s 6s
OK Cesaroni H90 32.7oz 78ft/s 408ft/s 16.0G 1,302ft 7.9s 6s
OK Cesaroni G54 33.8oz 75ft/s 317ft/s 11.8G 1,304ft 8.4s 5s
OK Cesaroni H87 34.2oz 69ft/s 401ft/s 12.5G 1,318ft 8.2s 6s
OK Cesaroni H54 34.4oz 65ft/s 324ft/s 9.6G 1,365ft 8.7s 5s
warningsW,D Estes G80 31.4oz 9:1 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 (29ft/s)
failedG AeroTech E23 speed at end of launch guide too slow (41ft/s)
failedG AeroTech E16 speed at end of launch guide too slow (33ft/s)
failedG AeroTech F23 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (44ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (41ft/s)
failedG Estes F15 speed at end of launch guide too slow (25ft/s)
failedG AeroTech F37 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (45ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni F29 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni F31 speed at end of launch guide too slow (41ft/s)
failed5 Estes F26 average thrust fails 5:1 thrust/weight ratio (3:1)
failedG AeroTech F26 speed at end of launch guide too slow (40ft/s)
failedG AeroTech F22 speed at end of launch guide too slow (35ft/s)
failedG Apogee F10 speed at end of launch guide too slow (29ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (39ft/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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