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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 85 motors that fit and appear to have enough thrust (672 motors didn't fit, 43 motors failed safety checks). 128 motor had thrust curves available and 269 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:   The Big Cletus 38
Owner: Kevin Katz
Body Diameter: 5.50in
Dry Weight: 85.0oz
MMT Diameter: 38.0mm
MMT Length: 16.00in
CD: 0.75

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 G339 91.3oz 73ft/s 130ft/s 13.8G 239ft 3.9s 4s
OK Contrail G123 103.0oz 49ft/s 121ft/s 11.4G 278ft 4.4s 3s
OK Cesaroni G185 91.6oz 50ft/s 137ft/s 7.0G 279ft 4.4s 4s
OK Contrail H222 103.3oz 68ft/s 151ft/s 22.6G 354ft 4.7s 4s
warningsW AeroTech H283 93.7oz 65ft/s 215ft/s 11.8G 555ft 5.7s 5s
OK AeroTech H148 95.9oz 48ft/s 197ft/s 6.2G 582ft 6.2s 5s
OK AeroTech H130 93.3oz 59ft/s 190ft/s 9.0G 593ft 6.1s 4s
OK AeroTech H669 93.8oz 104ft/s 259ft/s 41.4G 640ft 5.9s 6s
OK Loki H125 97.0oz 48ft/s 202ft/s 6.6G 679ft 6.7s 5s
OK Loki H144 96.8oz 55ft/s 213ft/s 8.2G 680ft 6.5s 5s
OK AeroTech H219 94.2oz 61ft/s 241ft/s 10.2G 686ft 6.4s 5s
OK AeroTech H242 94.3oz 54ft/s 239ft/s 8.0G 719ft 6.6s 5s
OK Loki H160 96.8oz 60ft/s 233ft/s 9.7G 743ft 6.7s 5s
OK Cesaroni H400 95.0oz 73ft/s 284ft/s 15.6G 758ft 6.5s 6s
OK Cesaroni H225 91.8oz 57ft/s 284ft/s 9.1G 841ft 7.0s 6s
OK AeroTech H550 96.4oz 94ft/s 346ft/s 23.1G 947ft 7.0s 6s
OK AeroTech H550 96.1oz 94ft/s 348ft/s 23.2G 949ft 7.0s 6s
OK AeroTech I218 98.1oz 60ft/s 295ft/s 9.4G 955ft 7.4s 6s
warningsW Cesaroni H565 97.7oz 89ft/s 353ft/s 21.7G 960ft 7.0s 6s
OK AeroTech H999 96.6oz 124ft/s 369ft/s 58.8G 964ft 6.9s 7s
OK AeroTech H170 96.6oz 48ft/s 280ft/s 6.4G 965ft 7.7s 6s
OK AeroTech I180 98.5oz 68ft/s 276ft/s 12.2G 988ft 7.5s 6s
OK AeroTech I161 97.9oz 50ft/s 277ft/s 7.0G 1,007ft 7.8s 6s
OK AeroTech I245 97.8oz 72ft/s 320ft/s 14.1G 1,065ft 7.6s 6s
OK AeroTech I357 97.1oz 70ft/s 336ft/s 13.0G 1,070ft 7.6s 6s
OK AeroTech I225 102.1oz 51ft/s 315ft/s 8.4G 1,070ft 7.8s 6s
OK Cesaroni I212 101.7oz 50ft/s 325ft/s 7.5G 1,086ft 7.9s 6s
OK Cesaroni I566 98.5oz 84ft/s 402ft/s 21.2G 1,112ft 7.4s 7s
OK Cesaroni I195 99.7oz 51ft/s 335ft/s 7.5G 1,205ft 8.3s 6s
OK Cesaroni I345 98.9oz 67ft/s 392ft/s 13.2G 1,207ft 7.9s 7s
OK Cesaroni I800 101.1oz 102ft/s 452ft/s 29.1G 1,222ft 7.6s 7s
OK AeroTech I285 102.3oz 65ft/s 374ft/s 12.2G 1,233ft 8.1s 7s
OK AeroTech I1299 99.8oz 140ft/s 476ft/s 52.9G 1,241ft 7.5s 7s
OK Cesaroni I170 98.8oz 49ft/s 343ft/s 7.2G 1,241ft 8.5s 6s
OK Cesaroni I236 99.1oz 59ft/s 365ft/s 10.3G 1,263ft 8.3s 6s
OK AeroTech I305 105.5oz 68ft/s 384ft/s 12.8G 1,295ft 8.1s 7s
OK Cesaroni I223 102.4oz 53ft/s 371ft/s 7.9G 1,304ft 8.5s 6s
OK AeroTech I211 101.0oz 60ft/s 352ft/s 10.4G 1,307ft 8.4s 6s
OK AeroTech I300 100.5oz 73ft/s 391ft/s 15.7G 1,309ft 8.2s 7s
OK AeroTech I195 105.1oz 63ft/s 352ft/s 11.3G 1,323ft 8.5s 6s
OK Loki I316 104.0oz 80ft/s 406ft/s 16.2G 1,390ft 8.3s 7s
OK Cesaroni I287 106.3oz 59ft/s 419ft/s 10.0G 1,428ft 8.6s 7s
OK Loki I405 104.1oz 94ft/s 446ft/s 26.7G 1,443ft 8.2s 7s
OK Loki I210 104.0oz 68ft/s 378ft/s 14.3G 1,465ft 8.7s 6s
OK Cesaroni I285 102.8oz 62ft/s 429ft/s 11.3G 1,504ft 8.7s 7s
OK Loki I430 104.0oz 78ft/s 485ft/s 17.4G 1,513ft 8.5s 7s
OK Loki I377 104.7oz 85ft/s 447ft/s 21.6G 1,517ft 8.5s 7s
OK Cesaroni I255 103.2oz 58ft/s 422ft/s 9.9G 1,530ft 8.9s 7s
OK Cesaroni I470 102.4oz 84ft/s 508ft/s 18.6G 1,548ft 8.5s 7s
OK AeroTech I366 104.6oz 77ft/s 464ft/s 15.8G 1,548ft 8.6s 7s
OK AeroTech I327 107.1oz 70ft/s 460ft/s 13.5G 1,554ft 8.7s 7s
OK AMW I297 105.8oz 65ft/s 450ft/s 11.7G 1,565ft 8.8s 7s
OK AeroTech I364 108.9oz 67ft/s 453ft/s 12.3G 1,565ft 8.8s 7s
OK KBA I550 110.1oz 82ft/s 568ft/s 20.4G 1,580ft 8.4s 7s
OK Cesaroni I303 102.6oz 66ft/s 454ft/s 13.5G 1,581ft 8.8s 7s
OK AeroTech I280 106.7oz 62ft/s 452ft/s 10.4G 1,612ft 9.0s 7s
OK AeroTech I435 103.2oz 95ft/s 510ft/s 25.3G 1,621ft 8.6s 7s
OK Cesaroni I242 104.4oz 58ft/s 430ft/s 8.8G 1,622ft 9.2s 7s
OK KBA I301 110.6oz 61ft/s 478ft/s 12.3G 1,627ft 8.8s 7s
OK Cesaroni I350 112.5oz 66ft/s 485ft/s 11.8G 1,672ft 9.1s 7s
OK AeroTech I284 104.6oz 75ft/s 475ft/s 15.5G 1,679ft 8.9s 7s
OK Cesaroni I125 107.8oz 48ft/s 328ft/s 7.9G 1,725ft 10.3s 6s
OK AeroTech I500 105.3oz 82ft/s 553ft/s 18.7G 1,726ft 8.8s 7s
warningsW Cesaroni I540 106.1oz 89ft/s 576ft/s 20.2G 1,740ft 8.8s 8s
OK AeroTech I600 106.2oz 100ft/s 572ft/s 26.8G 1,745ft 8.7s 8s
OK KBA J520 110.4oz 83ft/s 560ft/s 22.2G 1,760ft 8.9s 8s
OK KBA J740 110.5oz 100ft/s 621ft/s 28.6G 1,769ft 8.7s 8s
OK Loki J396 111.5oz 70ft/s 530ft/s 15.5G 1,781ft 9.1s 8s
OK AeroTech I350 106.7oz 72ft/s 539ft/s 15.0G 1,787ft 9.0s 7s
OK AeroTech J420 107.9oz 78ft/s 535ft/s 17.5G 1,788ft 9.0s 7s
OK AeroTech J350 108.4oz 95ft/s 539ft/s 26.3G 1,798ft 8.9s 7s
OK Cesaroni J335 107.1oz 71ft/s 514ft/s 12.8G 1,815ft 9.3s 7s
OK AeroTech J340 105.3oz 81ft/s 523ft/s 19.5G 1,818ft 9.1s 7s
OK Cesaroni J357 106.2oz 72ft/s 533ft/s 16.4G 1,833ft 9.2s 7s
OK Cesaroni J285 105.9oz 64ft/s 495ft/s 11.2G 1,840ft 9.4s 7s
OK Cesaroni I216 106.2oz 58ft/s 443ft/s 10.5G 1,851ft 9.7s 7s
OK Cesaroni J316 106.4oz 70ft/s 503ft/s 13.8G 1,854ft 9.4s 7s
OK Cesaroni J270 108.1oz 57ft/s 485ft/s 8.7G 1,858ft 9.6s 7s
OK AeroTech J425 107.2oz 67ft/s 572ft/s 13.5G 1,861ft 9.2s 8s
OK Cesaroni J290 108.2oz 67ft/s 505ft/s 12.0G 1,919ft 9.6s 7s
OK AeroTech J500 108.0oz 92ft/s 594ft/s 25.3G 1,925ft 9.1s 8s
OK AeroTech J270 107.6oz 64ft/s 506ft/s 11.0G 1,966ft 9.7s 7s
OK Loki J712 111.5oz 98ft/s 683ft/s 27.4G 2,037ft 9.2s 8s
OK AeroTech J435 107.0oz 91ft/s 613ft/s 22.2G 2,045ft 9.3s 8s
OK Loki J320 111.5oz 71ft/s 557ft/s 16.1G 2,176ft 9.9s 7s

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
failedA Contrail G130 rocket doesn't reach a safe altitude (157ft)
failedG AeroTech G67 speed at end of launch guide too slow (31ft/s)
failedG Loki G69 speed at end of launch guide too slow (32ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (29ft/s)
failedG Loki G70 speed at end of launch guide too slow (33ft/s)
failedG Loki G94 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (28ft/s)
failedG Loki G80 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni G46 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (28ft/s)
failedG Loki G66 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (29ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (28ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (23ft/s)
failedG Cesaroni G115 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (30ft/s)
failedG Contrail G100 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (21ft/s)
failedA Contrail G300 rocket doesn't reach a safe altitude (163ft)
failedG AeroTech H73 speed at end of launch guide too slow (28ft/s)
failedG Loki H100 speed at end of launch guide too slow (39ft/s)
failedG AeroTech H123 speed at end of launch guide too slow (41ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (37ft/s)
failedG Loki H90 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (40ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (33ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (46ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (35ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (28ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (41ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (21ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (23ft/s)
failedG Cesaroni I175 speed at end of launch guide too slow (47ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (41ft/s)
failedG Loki I110 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni J94 speed at end of launch guide too slow (38ft/s)

G These simulations were run with a launch guide length of 6ft (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.)

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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