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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 108 motors that fit and appear to have enough thrust (693 motors didn't fit, 10 motors failed safety checks). 116 motor had thrust curves available and 232 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:   Special 38
Owner: Kevin Katz
Body Diameter: 38.0mm
Dry Weight: 634g
MMT Diameter: 29.0mm
MMT Length: 20.00in
CD: 0.65

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 E23 738g 15m/s 34m/s 4.3G 87m 4.8s 3s
OK Cesaroni F36 738g 16m/s 49m/s 10.0G 137m 5.7s 5s
OK AeroTech F37 743g 17m/s 53m/s 5.4G 177m 6.6s 5s
OK AeroTech F27 714g 15m/s 49m/s 4.2G 177m 6.7s 4s
OK Cesaroni F32 741g 15m/s 55m/s 5.1G 190m 6.9s 5s
OK Cesaroni F36 735g 17m/s 57m/s 5.0G 194m 6.8s 5s
OK AeroTech F23 716g 17m/s 53m/s 5.9G 202m 7.1s 5s
OK AeroTech F62 743g 21m/s 64m/s 7.8G 217m 7.0s 6s
OK Cesaroni F31 736g 16m/s 60m/s 6.7G 221m 7.4s 6s
OK AeroTech F20 714g 17m/s 58m/s 5.9G 240m 7.6s 5s
OK Cesaroni F120 740g 32m/s 72m/s 19.1G 241m 7.1s 7s
OK AeroTech F42 710g 22m/s 65m/s 8.9G 244m 7.4s 6s
OK Cesaroni F59 733g 23m/s 69m/s 8.8G 245m 7.4s 6s
OK AeroTech F26 735g 15m/s 61m/s 4.3G 258m 8.1s 6s
OK AeroTech F67 714g 25m/s 78m/s 11.4G 299m 7.9s 7s
OK AeroTech F25 724g 20m/s 73m/s 7.1G 344m 8.9s 6s
OK AeroTech F50 719g 23m/s 83m/s 9.3G 347m 8.6s 7s
OK AeroTech F52 756g 23m/s 83m/s 9.7G 355m 8.8s 7s
OK AeroTech F40 760g 21m/s 82m/s 8.1G 385m 9.3s 7s
OK AeroTech G54 770g 23m/s 91m/s 9.9G 412m 9.4s 8s
OK Estes F50 718g 24m/s 92m/s 10.3G 419m 9.4s 8s
OK Cesaroni G88 786g 25m/s 99m/s 14.1G 439m 9.5s 9s
OK AeroTech G38 760g 18m/s 88m/s 6.1G 452m 10.2s 8s
OK AeroTech G104 770g 29m/s 102m/s 15.1G 459m 9.6s 9s
OK AeroTech G74 721g 25m/s 108m/s 12.1G 495m 10.1s 9s
OK AeroTech G53 780g 24m/s 99m/s 10.3G 496m 10.3s 8s
OK Cesaroni G80 777g 24m/s 111m/s 11.9G 528m 10.4s 9s
OK AeroTech G40 757g 22m/s 106m/s 8.8G 573m 11.0s 9s
OK Estes G40 757g 22m/s 106m/s 8.8G 573m 11.0s 9s
OK AeroTech G77 799g 23m/s 116m/s 11.1G 574m 10.9s 10s
OK AeroTech G77 756g 24m/s 124m/s 12.7G 616m 11.1s 10s
OK AeroTech G79 791g 25m/s 122m/s 12.1G 625m 11.2s 10s
OK Cesaroni G68 790g 23m/s 120m/s 10.9G 627m 11.4s 10s
OK Cesaroni G83 779g 27m/s 124m/s 12.1G 632m 11.2s 10s
OK Cesaroni G57 780g 24m/s 117m/s 10.5G 635m 11.5s 10s
OK AeroTech G72 766g 23m/s 126m/s 13.1G 637m 11.4s 10s
OK AeroTech G79 758g 22m/s 123m/s 10.2G 644m 11.5s 10s
OK Cesaroni G250 775g 44m/s 140m/s 37.8G 677m 11.2s 11s
OK AeroTech G25 755g 16m/s 102m/s 4.8G 689m 12.8s 8s
OK AeroTech G76 781g 32m/s 126m/s 18.7G 697m 11.7s 10s
OK AeroTech G64 785g 27m/s 125m/s 13.1G 716m 11.9s 10s
OK Cesaroni G126 779g 33m/s 140m/s 19.8G 717m 11.6s 11s
OK AeroTech G75 767g 27m/s 137m/s 13.0G 720m 11.8s 10s
OK Cesaroni G131 834g 30m/s 144m/s 18.6G 750m 11.9s 11s
OK AeroTech G78 759g 26m/s 142m/s 12.8G 779m 12.2s 11s
OK AeroTech G125 759g 30m/s 156m/s 20.2G 816m 12.3s 11s
OK AeroTech G80 762g 27m/s 148m/s 13.0G 836m 12.6s 11s
OK Cesaroni G33 831g 15m/s 122m/s 6.1G 843m 14.2s 10s
OK KBA G82 865g 22m/s 148m/s 11.4G 858m 13.0s 11s
OK Cesaroni G106 821g 26m/s 156m/s 15.3G 858m 12.8s 11s
OK KBA G135 860g 29m/s 161m/s 18.4G 879m 12.8s 12s
OK AeroTech G75 867g 21m/s 152m/s 8.7G 917m 13.6s 11s
OK RATT H70 986g 27m/s 151m/s 13.1G 1,010m 14.0s 11s
OK Cesaroni G54 827g 28m/s 150m/s 13.9G 1,022m 14.1s 11s
OK Cesaroni G125 828g 31m/s 179m/s 18.9G 1,026m 13.6s 12s
OK Cesaroni G118 822g 29m/s 179m/s 18.4G 1,031m 13.7s 12s
OK AeroTech H165 836g 34m/s 185m/s 22.9G 1,034m 13.6s 13s
OK Cesaroni H175 881g 34m/s 186m/s 28.1G 1,040m 13.6s 13s
OK Cesaroni H133 824g 33m/s 184m/s 22.7G 1,060m 13.8s 13s
OK Cesaroni H54 843g 24m/s 156m/s 11.2G 1,069m 14.5s 11s
OK Cesaroni H87 839g 26m/s 179m/s 14.6G 1,087m 14.2s 12s
OK Cesaroni H163 821g 36m/s 193m/s 26.0G 1,094m 13.9s 13s
OK Cesaroni H90 797g 29m/s 182m/s 18.9G 1,095m 14.1s 12s
OK Cesaroni H410 816g 56m/s 206m/s 66.1G 1,101m 13.6s 13s
OK AeroTech H128 840g 34m/s 192m/s 21.5G 1,109m 14.0s 13s
OK Cesaroni H123 862g 28m/s 190m/s 16.2G 1,123m 14.2s 13s
OK AeroTech H238 830g 40m/s 200m/s 29.0G 1,131m 14.0s 13s
OK AeroTech G138 782g 30m/s 203m/s 24.2G 1,132m 14.0s 13s
OK KBA H130 1,343g 28m/s 166m/s 15.7G 1,143m 15.0s 13s
OK AeroTech H115 839g 29m/s 196m/s 14.4G 1,160m 14.4s 13s
OK AeroTech H97 912g 25m/s 187m/s 11.6G 1,162m 14.7s 13s
OK Cesaroni H42 876g 18m/s 156m/s 7.7G 1,166m 15.7s 11s
OK Cesaroni H118 866g 31m/s 197m/s 19.0G 1,198m 14.5s 13s
OK Cesaroni H237 928g 40m/s 224m/s 33.9G 1,290m 14.8s 14s
OK AeroTech H220 884g 41m/s 227m/s 34.4G 1,317m 14.8s 14s
OK Cesaroni H151 872g 36m/s 222m/s 22.8G 1,337m 15.0s 14s
OK AeroTech H210 880g 39m/s 232m/s 30.1G 1,349m 15.0s 14s
OK Cesaroni H135 885g 32m/s 227m/s 18.1G 1,397m 15.5s 14s
OK Cesaroni H160 906g 33m/s 232m/s 20.2G 1,398m 15.4s 14s
OK Cesaroni H170 866g 37m/s 234m/s 27.0G 1,406m 15.3s 14s
OK AeroTech H182 841g 35m/s 249m/s 23.1G 1,433m 15.3s 14s
OK AeroTech H180 886g 38m/s 244m/s 29.0G 1,451m 15.4s 14s
OK Cesaroni H53 920g 21m/s 191m/s 9.4G 1,476m 16.9s 12s
OK AeroTech H250 890g 47m/s 254m/s 36.4G 1,478m 15.4s 15s
OK KBA H225 950g 33m/s 252m/s 29.6G 1,512m 15.8s 15s
OK AeroTech H135 846g 30m/s 236m/s 17.7G 1,512m 16.0s 14s
OK Cesaroni H295 976g 45m/s 263m/s 41.1G 1,538m 15.7s 15s
OK AeroTech H169 836g 40m/s 257m/s 27.9G 1,539m 15.7s 14s
OK AeroTech H195 831g 42m/s 272m/s 30.2G 1,561m 15.7s 15s
OK Cesaroni H180 948g 39m/s 255m/s 28.1G 1,591m 16.1s 15s
OK Cesaroni H194 918g 39m/s 265m/s 30.4G 1,612m 16.1s 15s
OK Cesaroni H200 908g 41m/s 269m/s 31.6G 1,646m 16.2s 15s
OK Cesaroni H340 1,025g 49m/s 286m/s 43.4G 1,693m 16.3s 15s
OK Cesaroni H140 911g 37m/s 260m/s 26.5G 1,694m 16.6s 15s
OK Cesaroni H255 866g 46m/s 298m/s 43.3G 1,736m 16.2s 15s
OK Cesaroni H399 928g 55m/s 305m/s 59.1G 1,748m 16.3s 16s
OK Cesaroni H226 994g 44m/s 290m/s 35.0G 1,822m 16.8s 15s
OK Cesaroni H159 977g 33m/s 285m/s 18.8G 1,826m 17.1s 15s
OK AeroTech H268 992g 44m/s 303m/s 33.6G 1,851m 16.9s 16s
OK Cesaroni H233 962g 41m/s 306m/s 35.1G 1,883m 17.0s 16s
OK Cesaroni H160 953g 43m/s 285m/s 32.9G 1,902m 17.2s 15s
OK Cesaroni H255 952g 47m/s 317m/s 43.3G 1,918m 17.0s 16s
OK AeroTech I200 992g 41m/s 301m/s 30.3G 1,931m 17.2s 15s
OK Cesaroni I204 983g 44m/s 322m/s 36.1G 2,046m 17.5s 16s
OK AeroTech I205 949g 39m/s 332m/s 38.1G 2,056m 17.4s 16s
OK Cesaroni I243 1,033g 43m/s 345m/s 42.1G 2,187m 17.9s 16s
OK Cesaroni I224 1,004g 48m/s 341m/s 43.1G 2,194m 17.9s 16s
warningsD Estes G80 762g 10:1 thrust/weight ratio (no data)

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 (11m/s)
failedG AeroTech E16 speed at end of launch guide too slow (13m/s)
failedG Estes F15 speed at end of launch guide too slow (10m/s)
failedG Cesaroni F29 speed at end of launch guide too slow (14m/s)
failed5 Estes F26 average thrust fails 5:1 thrust/weight ratio (4:1)
failedG AeroTech F22 speed at end of launch guide too slow (13m/s)
failedG Apogee F10 speed at end of launch guide too slow (11m/s)
failedG AeroTech G8 speed at end of launch guide too slow (4m/s)
failedG AeroTech G11 speed at end of launch guide too slow (11m/s)
failedG AeroTech G12 speed at end of launch guide too slow (12m/s)

G These simulations were run with a launch guide length of 3m (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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