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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 122 motors that fit and appear to have enough thrust (681 motors didn't fit, 8 motors failed safety checks). 127 motor had thrust curves available and 221 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:   Little John
Owner: Braden Carlson
Body Diameter: 4.00in
Dry Weight: 4.50lb
MMT Diameter: 54.0mm
MMT Length: 20.00in
CD: 0.30

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 I215 5.66lb 57ft/s 444ft/s 9.4G 2,447ft 12.3s 10s
OK AeroTech I170 5.66lb 48ft/s 434ft/s 7.3G 2,495ft 12.7s 10s
OK AeroTech I599 5.63lb 105ft/s 509ft/s 29.8G 2,588ft 12.0s 11s
OK AeroTech I229 5.63lb 57ft/s 471ft/s 10.1G 2,612ft 12.6s 11s
OK Cesaroni I445 5.77lb 77ft/s 565ft/s 20.0G 3,102ft 13.1s 12s
OK Cesaroni I218 5.78lb 59ft/s 527ft/s 9.4G 3,195ft 13.8s 12s
OK Cesaroni I165 5.81lb 49ft/s 506ft/s 6.3G 3,348ft 14.6s 11s
OK Cesaroni I100 6.28lb 54ft/s 432ft/s 9.9G 3,978ft 16.4s 7s
OK AeroTech I65 6.16lb 48ft/s 454ft/s 6.2G 4,287ft 17.3s 9s
OK Cesaroni J250 6.33lb 51ft/s 672ft/s 9.1G 4,402ft 15.9s 13s
OK AeroTech J250 6.50lb 55ft/s 681ft/s 9.9G 4,523ft 16.0s 13s
OK Cesaroni J145 6.35lb 56ft/s 553ft/s 16.2G 4,543ft 16.5s 12s
OK Cesaroni J280 6.60lb 55ft/s 705ft/s 10.2G 4,555ft 16.0s 13s
OK AeroTech J250 6.06lb 65ft/s 689ft/s 11.6G 4,707ft 16.0s 13s
OK Cesaroni J1055 6.20lb 121ft/s 863ft/s 41.1G 4,809ft 15.2s 15s
OK AeroTech J315 6.38lb 63ft/s 740ft/s 12.5G 4,891ft 16.2s 14s
OK AeroTech J180 6.28lb 62ft/s 664ft/s 10.7G 5,217ft 17.0s 12s
OK Gorilla J365 7.15lb 52ft/s 792ft/s 15.2G 5,245ft 16.8s 14s
OK Cesaroni J240 6.43lb 55ft/s 748ft/s 9.3G 5,258ft 17.0s 14s
OK Cesaroni J430 6.26lb 77ft/s 858ft/s 17.8G 5,347ft 16.4s 14s
OK AeroTech J275 6.41lb 59ft/s 751ft/s 11.0G 5,397ft 17.0s 13s
OK AeroTech J1299 6.34lb 138ft/s 974ft/s 52.6G 5,424ft 15.9s 15s
OK Cesaroni J293 6.35lb 60ft/s 802ft/s 11.6G 5,430ft 17.0s 14s
OK AeroTech J460 6.24lb 81ft/s 874ft/s 19.2G 5,462ft 16.4s 14s
OK Cesaroni J244 6.51lb 53ft/s 775ft/s 8.2G 5,513ft 17.5s 14s
OK Cesaroni J210 6.36lb 58ft/s 696ft/s 10.6G 5,514ft 17.8s 14s
OK AMW J1365 6.97lb 132ft/s 979ft/s 50.8G 5,698ft 16.4s 16s
OK AMW J400 7.55lb 62ft/s 859ft/s 13.9G 5,795ft 17.4s 15s
OK Loki J350 7.28lb 61ft/s 861ft/s 13.4G 5,881ft 17.5s 15s
OK Gorilla J167 7.18lb 58ft/s 647ft/s 10.7G 5,923ft 18.6s 13s
OK AMW J475 7.61lb 69ft/s 919ft/s 18.0G 6,078ft 17.5s 15s
OK Cesaroni J360 6.93lb 62ft/s 924ft/s 16.6G 6,260ft 17.8s 15s
OK Cesaroni J380 7.35lb 62ft/s 941ft/s 12.8G 6,296ft 17.9s 15s
OK Gorilla J465 7.11lb 66ft/s 966ft/s 20.5G 6,324ft 17.6s 15s
OK AeroTech J1799 6.95lb 151ft/s 1,154ft/s 69.5G 6,352ft 16.7s 16s
OK Gorilla J395 7.06lb 63ft/s 942ft/s 14.0G 6,368ft 18.0s 15s
OK AeroTech J450 7.20lb 69ft/s 961ft/s 16.2G 6,445ft 17.9s 16s
OK Cesaroni J1520 6.76lb 138ft/s 1,176ft/s 58.1G 6,450ft 16.8s 16s
OK AMW J395 7.30lb 67ft/s 931ft/s 13.7G 6,526ft 18.2s 15s
OK Gorilla J485 7.12lb 69ft/s 1,003ft/s 17.7G 6,539ft 17.8s 16s
OK Gorilla J450 7.71lb 60ft/s 955ft/s 17.2G 6,563ft 18.2s 16s
OK Gorilla J535 7.20lb 89ft/s 1,029ft/s 20.2G 6,617ft 17.7s 16s
OK AMW J325 7.21lb 76ft/s 875ft/s 15.9G 6,634ft 18.4s 15s
OK AMW J440 7.21lb 97ft/s 983ft/s 24.1G 6,640ft 17.7s 16s
OK Loki J525 7.23lb 83ft/s 1,045ft/s 20.0G 6,681ft 17.8s 16s
OK Loki J820 7.17lb 109ft/s 1,091ft/s 32.0G 6,684ft 17.4s 16s
OK AMW K1720 7.48lb 147ft/s 1,178ft/s 60.6G 6,824ft 17.4s 17s
OK AeroTech J540 6.89lb 86ft/s 1,082ft/s 21.4G 6,843ft 17.7s 15s
OK AeroTech J401 6.51lb 73ft/s 1,045ft/s 15.6G 6,902ft 18.0s 15s
OK AMW J745 7.19lb 97ft/s 1,134ft/s 26.7G 7,075ft 18.0s 16s
OK AMW J475 7.79lb 74ft/s 1,000ft/s 16.0G 7,085ft 18.6s 15s
OK Loki J175 7.26lb 63ft/s 770ft/s 12.1G 7,132ft 19.7s 13s
OK Cesaroni J355 7.09lb 66ft/s 999ft/s 13.0G 7,159ft 18.7s 15s
OK Loki J300 7.40lb 65ft/s 925ft/s 11.3G 7,283ft 19.3s 15s
OK Cesaroni J295 6.97lb 68ft/s 944ft/s 13.2G 7,329ft 19.0s 15s
OK AeroTech J800 6.89lb 102ft/s 1,203ft/s 30.0G 7,343ft 17.9s 16s
OK AMW K665 8.33lb 79ft/s 1,127ft/s 22.6G 7,420ft 18.6s 17s
OK Cesaroni J760 6.87lb 94ft/s 1,246ft/s 28.4G 7,447ft 18.0s 16s
OK AeroTech K456 7.77lb 70ft/s 1,080ft/s 14.0G 7,463ft 18.9s 16s
OK AeroTech J415 7.08lb 72ft/s 1,072ft/s 16.5G 7,464ft 18.7s 15s
OK Cesaroni J449 6.97lb 74ft/s 1,129ft/s 17.1G 7,523ft 18.6s 16s
OK Gorilla K222 8.02lb 61ft/s 790ft/s 11.0G 7,622ft 20.5s 14s
OK Cesaroni K360 7.22lb 63ft/s 1,071ft/s 11.6G 7,647ft 19.2s 16s
OK AeroTech K2050 7.35lb 148ft/s 1,413ft/s 68.0G 7,722ft 17.9s 17s
OK Cesaroni K2045 7.34lb 158ft/s 1,455ft/s 70.8G 7,770ft 17.9s 17s
OK AeroTech K400 7.13lb 77ft/s 1,073ft/s 16.0G 7,830ft 19.3s 16s
OK Cesaroni K454 7.57lb 69ft/s 1,123ft/s 15.3G 7,836ft 19.2s 16s
OK Gorilla K555 7.98lb 71ft/s 1,159ft/s 17.9G 7,837ft 19.2s 17s
OK Cesaroni K530 8.12lb 73ft/s 1,182ft/s 16.1G 7,851ft 19.1s 16s
OK Gorilla K520 7.68lb 70ft/s 1,156ft/s 17.0G 7,853ft 19.2s 17s
OK Gorilla K630 7.94lb 77ft/s 1,188ft/s 22.5G 7,889ft 19.0s 17s
OK Gorilla K533 8.28lb 68ft/s 1,134ft/s 18.7G 7,891ft 19.3s 17s
OK AMW K475 7.79lb 72ft/s 1,136ft/s 15.7G 7,931ft 19.4s 16s
OK KBA K700 7.81lb 88ft/s 1,261ft/s 26.1G 7,998ft 18.9s 17s
OK AeroTech K513 8.13lb 77ft/s 1,189ft/s 17.8G 8,051ft 19.2s 16s
OK AMW K535 7.94lb 77ft/s 1,157ft/s 17.3G 8,077ft 19.4s 17s
OK AeroTech K695 7.78lb 86ft/s 1,277ft/s 26.0G 8,112ft 18.8s 17s
OK AeroTech K535 7.29lb 82ft/s 1,200ft/s 18.8G 8,116ft 19.0s 16s
OK AeroTech K185 7.66lb 53ft/s 849ft/s 9.0G 8,177ft 20.8s 13s
OK AMW K610 8.39lb 79ft/s 1,187ft/s 19.0G 8,306ft 19.6s 17s
OK AMW K455 7.82lb 84ft/s 1,115ft/s 21.3G 8,344ft 19.6s 16s
OK AeroTech K1100 7.45lb 119ft/s 1,439ft/s 39.6G 8,499ft 18.7s 17s
OK AMW K935 7.82lb 101ft/s 1,370ft/s 30.9G 8,517ft 19.1s 17s
OK AMW K700 9.10lb 77ft/s 1,260ft/s 21.2G 8,538ft 19.7s 17s
OK Loki K690 9.79lb 73ft/s 1,247ft/s 19.4G 8,542ft 19.9s 18s
OK AeroTech K540 7.31lb 94ft/s 1,296ft/s 25.4G 8,642ft 19.1s 16s
OK AeroTech K550 7.78lb 86ft/s 1,235ft/s 22.8G 8,709ft 19.5s 16s
OK AMW K855 9.18lb 92ft/s 1,334ft/s 26.0G 8,756ft 19.6s 18s
OK Cesaroni K500 7.75lb 73ft/s 1,258ft/s 16.8G 8,763ft 19.8s 17s
OK Cesaroni K940 7.51lb 103ft/s 1,477ft/s 32.1G 8,768ft 19.0s 17s
OK Cesaroni K515 8.15lb 74ft/s 1,251ft/s 17.7G 8,915ft 20.0s 17s
OK Cesaroni K400 7.92lb 70ft/s 1,177ft/s 12.6G 8,921ft 20.4s 16s
OK Gorilla K327 8.51lb 72ft/s 993ft/s 17.4G 8,935ft 20.7s 15s
OK Cesaroni K630 7.61lb 91ft/s 1,396ft/s 22.4G 8,973ft 19.4s 17s
OK Cesaroni K650 8.89lb 78ft/s 1,364ft/s 18.5G 8,992ft 19.9s 17s
OK Gorilla K700 8.28lb 81ft/s 1,353ft/s 21.3G 9,012ft 20.0s 18s
OK Gorilla K763 8.45lb 85ft/s 1,391ft/s 23.2G 9,047ft 19.8s 18s
OK Cesaroni K445 7.58lb 81ft/s 1,221ft/s 18.8G 9,081ft 20.0s 16s
OK Gorilla K805 8.41lb 87ft/s 1,404ft/s 29.6G 9,155ft 19.8s 18s
OK AeroTech K805 7.90lb 92ft/s 1,443ft/s 25.0G 9,189ft 19.6s 17s
OK Cesaroni K520 7.97lb 78ft/s 1,311ft/s 16.4G 9,226ft 20.1s 17s
OK Cesaroni K160 7.75lb 49ft/s 804ft/s 6.9G 9,251ft 22.8s 13s
OK AeroTech K1103 7.72lb 132ft/s 1,580ft/s 46.0G 9,270ft 19.2s 18s
OK AMW K710 8.49lb 96ft/s 1,322ft/s 22.5G 9,311ft 20.1s 17s
OK AMW K670 8.66lb 91ft/s 1,349ft/s 20.8G 9,376ft 20.3s 18s
OK Loki K250 8.45lb 77ft/s 956ft/s 20.3G 9,568ft 22.2s 15s
OK AMW K580 8.52lb 97ft/s 1,298ft/s 27.5G 9,647ft 20.5s 17s
OK Cesaroni K740 7.74lb 93ft/s 1,512ft/s 24.9G 9,660ft 19.8s 17s
OK AMW K1250 8.50lb 125ft/s 1,576ft/s 41.8G 9,678ft 19.8s 18s
OK Loki K960 8.35lb 122ft/s 1,544ft/s 40.6G 9,740ft 19.9s 18s
OK Cesaroni K1200 8.10lb 116ft/s 1,709ft/s 37.6G 9,886ft 19.7s 18s
OK Cesaroni K650 8.27lb 93ft/s 1,472ft/s 32.5G 9,952ft 20.2s 17s
OK Cesaroni K635 8.40lb 82ft/s 1,459ft/s 20.1G 9,985ft 20.4s 17s
OK Loki K527 8.85lb 82ft/s 1,335ft/s 18.4G 10,206ft 21.3s 17s
OK Cesaroni K490 8.59lb 74ft/s 1,355ft/s 14.4G 10,262ft 21.2s 17s
OK Cesaroni K780 8.25lb 96ft/s 1,625ft/s 26.3G 10,269ft 20.2s 17s
OK Cesaroni K570 8.21lb 93ft/s 1,430ft/s 23.6G 10,466ft 20.8s 17s
OK Cesaroni K600 8.67lb 83ft/s 1,466ft/s 19.2G 10,520ft 21.0s 17s
OK Cesaroni K261 8.76lb 54ft/s 1,072ft/s 8.3G 10,953ft 23.3s 14s
warningsD AMW K590 8.29lb 16:1 thrust/weight ratio (no data)
warningsD Gorilla K695 7.80lb 20:1 thrust/weight ratio (no data)
warningsD Gorilla K828 8.55lb 22:1 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 AeroTech I117 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni I140 speed at end of launch guide too slow (42ft/s)
failedG AeroTech I115 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni I150 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni I120 speed at end of launch guide too slow (42ft/s)
failedG AeroTech J90 speed at end of launch guide too slow (39ft/s)
failedG AeroTech J135 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni J140 speed at end of launch guide too slow (44ft/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.)

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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