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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 42 motors that fit and appear to have enough thrust (703 motors didn't fit, 46 motors failed safety checks). 86 motor had thrust curves available and 171 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:   Alpha III XXL 29mm
Owner: Jim Lane
Body Diameter: 4.00in
Dry Weight: 56.0oz
MMT Diameter: 29.0mm
MMT Length: 10.00in
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 AeroTech G104 60.8oz 55ft/s 132ft/s 6.2G 302ft 4.6s 4s
OK Cesaroni G83 61.1oz 48ft/s 157ft/s 4.9G 429ft 5.6s 4s
OK Cesaroni G250 61.0oz 85ft/s 193ft/s 16.0G 490ft 5.5s 5s
OK AeroTech G76 61.2oz 59ft/s 158ft/s 7.9G 492ft 5.9s 4s
OK AeroTech G64 61.3oz 51ft/s 154ft/s 5.3G 500ft 6.1s 4s
OK Cesaroni G126 61.1oz 60ft/s 186ft/s 8.3G 513ft 5.8s 5s
OK AeroTech G75 60.6oz 48ft/s 169ft/s 5.0G 520ft 6.1s 4s
OK AeroTech G78 60.4oz 48ft/s 178ft/s 5.1G 542ft 6.2s 5s
OK Cesaroni G131 63.1oz 57ft/s 196ft/s 7.7G 559ft 6.1s 5s
OK AeroTech G125 60.4oz 59ft/s 204ft/s 8.1G 588ft 6.2s 5s
OK AeroTech G80 60.5oz 50ft/s 186ft/s 5.2G 593ft 6.4s 5s
OK Cesaroni G106 62.6oz 50ft/s 208ft/s 6.5G 638ft 6.6s 5s
OK KBA G135 64.0oz 56ft/s 224ft/s 7.9G 679ft 6.7s 6s
OK Cesaroni G54 62.8oz 51ft/s 183ft/s 5.9G 771ft 7.6s 5s
OK Cesaroni G118 62.6oz 57ft/s 241ft/s 8.0G 802ft 7.2s 6s
OK Cesaroni G125 62.9oz 61ft/s 244ft/s 8.2G 806ft 7.2s 6s
OK AeroTech H165 63.1oz 70ft/s 256ft/s 9.9G 822ft 7.1s 6s
OK Cesaroni H133 62.7oz 64ft/s 251ft/s 10.0G 838ft 7.3s 6s
OK Cesaroni H87 63.2oz 49ft/s 233ft/s 6.3G 845ft 7.6s 6s
OK Cesaroni H90 61.7oz 55ft/s 236ft/s 8.0G 846ft 7.5s 6s
OK Cesaroni H175 64.7oz 67ft/s 264ft/s 11.9G 846ft 7.2s 6s
OK Cesaroni H163 62.6oz 68ft/s 267ft/s 11.5G 873ft 7.3s 6s
OK AeroTech G138 61.2oz 59ft/s 272ft/s 9.8G 884ft 7.4s 6s
OK Cesaroni H410 62.4oz 113ft/s 295ft/s 29.0G 894ft 7.1s 7s
OK AeroTech H128 63.3oz 66ft/s 265ft/s 9.4G 895ft 7.4s 6s
OK Cesaroni H123 64.0oz 56ft/s 263ft/s 6.8G 906ft 7.6s 6s
OK AeroTech H238 62.9oz 77ft/s 281ft/s 12.6G 921ft 7.4s 6s
OK AeroTech H115 63.2oz 56ft/s 262ft/s 6.0G 929ft 7.8s 6s
OK AeroTech H97 65.8oz 49ft/s 255ft/s 5.0G 950ft 8.1s 6s
OK Cesaroni H118 64.2oz 60ft/s 270ft/s 8.5G 987ft 7.8s 6s
OK AeroTech H220 64.8oz 83ft/s 328ft/s 16.0G 1,128ft 8.0s 7s
OK Cesaroni H151 64.4oz 71ft/s 310ft/s 10.4G 1,134ft 8.2s 7s
OK AeroTech H210 64.7oz 79ft/s 333ft/s 13.4G 1,151ft 8.1s 7s
OK Cesaroni H135 64.9oz 61ft/s 315ft/s 8.2G 1,192ft 8.5s 7s
OK Cesaroni H170 64.2oz 72ft/s 330ft/s 12.3G 1,206ft 8.3s 7s
OK AeroTech H182 63.3oz 68ft/s 343ft/s 9.9G 1,215ft 8.4s 7s
OK AeroTech H180 64.9oz 76ft/s 348ft/s 13.2G 1,263ft 8.5s 7s
OK AeroTech H135 63.5oz 60ft/s 320ft/s 7.7G 1,288ft 8.9s 7s
OK AeroTech H250 65.0oz 91ft/s 368ft/s 16.8G 1,292ft 8.4s 7s
OK AeroTech H195 62.9oz 82ft/s 376ft/s 13.5G 1,358ft 8.7s 7s
OK Cesaroni H255 64.2oz 91ft/s 427ft/s 20.1G 1,555ft 9.0s 8s
warningsW,D Estes G80 60.4oz 5:1 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 (8ft/s)
failedG AeroTech E23 speed at end of launch guide too slow (23ft/s)
failedG AeroTech E16 speed at end of launch guide too slow (14ft/s)
failedG AeroTech F23 speed at end of launch guide too slow (26ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (28ft/s)
failedG AeroTech F27 speed at end of launch guide too slow (24ft/s)
failed5 Estes F15 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG AeroTech F37 speed at end of launch guide too slow (29ft/s)
failedG AeroTech F62 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (28ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (24ft/s)
failedG AeroTech F42 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni F29 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni F31 speed at end of launch guide too slow (25ft/s)
failedA Cesaroni F120 rocket doesn't reach a safe altitude (145ft)
failedG Cesaroni F59 speed at end of launch guide too slow (39ft/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 (23ft/s)
failedG AeroTech F22 speed at end of launch guide too slow (20ft/s)
failedG AeroTech F52 speed at end of launch guide too slow (42ft/s)
failedG Apogee F10 speed at end of launch guide too slow (5ft/s)
failedG AeroTech F50 speed at end of launch guide too slow (41ft/s)
failedG Estes F50 speed at end of launch guide too slow (43ft/s)
failedG AeroTech F25 speed at end of launch guide too slow (33ft/s)
failedG AeroTech F40 speed at end of launch guide too slow (37ft/s)
failedG AeroTech G54 speed at end of launch guide too slow (43ft/s)
failedG AeroTech G74 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni G88 speed at end of launch guide too slow (48ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (30ft/s)
failedG AeroTech G53 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G80 speed at end of launch guide too slow (46ft/s)
failedG Estes G40 speed at end of launch guide too slow (39ft/s)
failedG AeroTech G77 speed at end of launch guide too slow (45ft/s)
failedG AeroTech G77 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G57 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G68 speed at end of launch guide too slow (42ft/s)
failedG AeroTech G79 speed at end of launch guide too slow (42ft/s)
failedG AeroTech G79 speed at end of launch guide too slow (47ft/s)
failedG AeroTech G40 speed at end of launch guide too slow (39ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (27ft/s)
failedG AeroTech G75 speed at end of launch guide too slow (40ft/s)
failedG KBA G82 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (25ft/s)
failedG Cesaroni H54 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni H42 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.

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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