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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 184 motors that fit and appear to have enough thrust (623 motors didn't fit, 4 motors failed safety checks). 185 motor had thrust curves available and 337 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:   4-Inch Black Fly
Owner: Erik Czerwin
Body Diameter: 3.98in
Dry Weight: 4.50lb
MMT Diameter: 54.0mm
MMT Length: 40.00in
CD: 0.35

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 Cesaroni I140 5.74lb 48ft/s 391ft/s 5.3G 2,240ft 12.3s 9s
OK AeroTech I215 5.66lb 66ft/s 440ft/s 9.4G 2,335ft 12.0s 10s
OK AeroTech I170 5.66lb 57ft/s 430ft/s 7.3G 2,382ft 12.3s 10s
OK AeroTech I599 5.63lb 123ft/s 507ft/s 29.8G 2,456ft 11.6s 11s
OK AeroTech I229 5.63lb 68ft/s 467ft/s 10.0G 2,486ft 12.2s 10s
OK Cesaroni I150 5.76lb 52ft/s 453ft/s 5.9G 2,800ft 13.5s 10s
OK Cesaroni I445 5.77lb 88ft/s 562ft/s 19.9G 2,930ft 12.6s 12s
OK Cesaroni I218 5.78lb 67ft/s 521ft/s 9.4G 3,024ft 13.4s 11s
OK Cesaroni I165 5.81lb 57ft/s 498ft/s 6.3G 3,174ft 14.1s 11s
OK Contrail J245 7.92lb 69ft/s 493ft/s 11.5G 3,197ft 13.9s 11s
OK Contrail J355 7.95lb 84ft/s 558ft/s 14.8G 3,446ft 14.2s 12s
OK Hypertek J115 7.33lb 55ft/s 429ft/s 6.3G 3,526ft 15.7s 9s
OK Hypertek J250 7.35lb 74ft/s 548ft/s 11.5G 3,733ft 14.7s 12s
OK Cesaroni I100 6.28lb 61ft/s 422ft/s 9.9G 3,779ft 16.0s 7s
OK Contrail J292 7.90lb 85ft/s 548ft/s 14.7G 3,790ft 15.0s 12s
OK Hypertek J170 7.33lb 69ft/s 512ft/s 9.7G 3,913ft 15.5s 11s
OK AeroTech I65 6.16lb 55ft/s 443ft/s 6.2G 4,063ft 16.8s 8s
OK Hypertek J120 7.35lb 58ft/s 476ft/s 7.0G 4,073ft 16.5s 10s
OK Cesaroni J250 6.33lb 58ft/s 662ft/s 9.0G 4,128ft 15.3s 12s
OK AeroTech J250 6.50lb 62ft/s 671ft/s 9.8G 4,237ft 15.3s 13s
OK Cesaroni J280 6.60lb 66ft/s 695ft/s 10.2G 4,264ft 15.3s 13s
OK Cesaroni J145 6.35lb 64ft/s 540ft/s 16.2G 4,277ft 16.0s 11s
OK Hypertek J270 7.36lb 83ft/s 619ft/s 14.1G 4,383ft 15.6s 12s
OK AeroTech J250 6.06lb 75ft/s 675ft/s 11.6G 4,397ft 15.3s 12s
OK Cesaroni J1055 6.20lb 139ft/s 858ft/s 41.0G 4,462ft 14.5s 14s
OK AeroTech J315 6.38lb 74ft/s 728ft/s 12.5G 4,564ft 15.5s 13s
OK Hypertek J190 7.35lb 72ft/s 586ft/s 10.7G 4,596ft 16.4s 12s
OK Contrail J358 8.34lb 87ft/s 668ft/s 18.6G 4,761ft 16.3s 14s
OK AeroTech J180 6.28lb 72ft/s 649ft/s 10.7G 4,876ft 16.3s 12s
OK Gorilla J365 7.15lb 63ft/s 782ft/s 15.0G 4,895ft 16.1s 14s
OK Cesaroni J240 6.43lb 65ft/s 733ft/s 9.3G 4,905ft 16.3s 13s
OK Cesaroni J430 6.26lb 87ft/s 846ft/s 17.8G 4,963ft 15.7s 14s
OK AeroTech J1299 6.34lb 159ft/s 969ft/s 52.4G 5,011ft 15.1s 14s
OK AeroTech J275 6.41lb 68ft/s 735ft/s 10.9G 5,028ft 16.3s 13s
OK Cesaroni J293 6.35lb 69ft/s 787ft/s 11.6G 5,053ft 16.2s 13s
OK AeroTech J460 6.24lb 95ft/s 861ft/s 19.1G 5,062ft 15.6s 14s
OK Cesaroni J244 6.51lb 63ft/s 759ft/s 8.2G 5,139ft 16.7s 13s
OK Cesaroni J210 6.36lb 66ft/s 679ft/s 10.6G 5,163ft 17.1s 13s
OK AMW J1365 6.97lb 153ft/s 974ft/s 50.6G 5,271ft 15.6s 15s
OK AMW J400 7.55lb 72ft/s 846ft/s 13.8G 5,389ft 16.6s 14s
OK Loki J350 7.28lb 72ft/s 848ft/s 13.3G 5,469ft 16.8s 14s
OK Gorilla J167 7.18lb 67ft/s 630ft/s 10.7G 5,551ft 17.9s 12s
OK AMW J475 7.61lb 82ft/s 906ft/s 17.9G 5,638ft 16.7s 15s
OK Contrail J642 8.45lb 115ft/s 846ft/s 37.9G 5,658ft 16.8s 15s
OK Contrail J272 8.35lb 84ft/s 695ft/s 14.4G 5,679ft 17.9s 14s
OK Cesaroni J360 6.93lb 71ft/s 907ft/s 16.6G 5,801ft 17.0s 14s
OK Cesaroni J380 7.35lb 71ft/s 924ft/s 12.6G 5,833ft 17.1s 14s
OK AeroTech J1799 6.95lb 177ft/s 1,148ft/s 69.5G 5,836ft 15.9s 15s
OK Gorilla J465 7.11lb 78ft/s 951ft/s 20.3G 5,851ft 16.8s 15s
OK Gorilla J395 7.06lb 73ft/s 925ft/s 13.9G 5,901ft 17.1s 15s
OK Cesaroni J1520 6.76lb 162ft/s 1,168ft/s 57.6G 5,922ft 16.0s 15s
OK AeroTech J450 7.20lb 77ft/s 946ft/s 16.1G 5,970ft 17.1s 15s
OK Gorilla J485 7.12lb 83ft/s 987ft/s 17.6G 6,044ft 17.0s 15s
OK AMW J395 7.30lb 80ft/s 914ft/s 13.7G 6,051ft 17.4s 15s
OK Contrail J416 8.25lb 98ft/s 808ft/s 20.4G 6,074ft 17.9s 15s
OK Gorilla J450 7.71lb 72ft/s 940ft/s 17.1G 6,083ft 17.4s 15s
OK Gorilla J535 7.20lb 101ft/s 1,014ft/s 20.2G 6,110ft 16.8s 15s
OK AMW J440 7.21lb 113ft/s 966ft/s 24.1G 6,137ft 16.9s 15s
OK Loki J820 7.17lb 128ft/s 1,077ft/s 31.7G 6,153ft 16.5s 15s
OK AMW J325 7.21lb 84ft/s 854ft/s 15.9G 6,159ft 17.5s 14s
OK Loki J525 7.23lb 93ft/s 1,029ft/s 19.8G 6,167ft 17.0s 15s
OK AeroTech J135 7.02lb 55ft/s 693ft/s 7.2G 6,195ft 18.8s 11s
OK AMW K1720 7.48lb 171ft/s 1,171ft/s 60.4G 6,275ft 16.5s 16s
OK AeroTech J540 6.89lb 102ft/s 1,061ft/s 21.3G 6,301ft 16.8s 15s
OK AeroTech J401 6.51lb 87ft/s 1,022ft/s 15.6G 6,362ft 17.1s 14s
OK AMW J745 7.19lb 113ft/s 1,118ft/s 26.6G 6,513ft 17.1s 15s
OK AMW J475 7.79lb 84ft/s 983ft/s 16.0G 6,560ft 17.8s 15s
OK Cesaroni J355 7.09lb 77ft/s 974ft/s 12.9G 6,615ft 17.8s 14s
OK Loki J175 7.26lb 72ft/s 748ft/s 12.1G 6,644ft 18.8s 12s
OK AeroTech J800 6.89lb 117ft/s 1,182ft/s 30.0G 6,740ft 17.0s 15s
OK Loki J300 7.40lb 75ft/s 901ft/s 11.3G 6,754ft 18.5s 14s
OK Cesaroni J295 6.97lb 80ft/s 917ft/s 13.2G 6,782ft 18.2s 14s
OK Cesaroni J760 6.87lb 111ft/s 1,226ft/s 28.4G 6,831ft 17.1s 15s
OK AMW K665 8.33lb 90ft/s 1,109ft/s 22.4G 6,838ft 17.7s 16s
OK AeroTech J415 7.08lb 83ft/s 1,047ft/s 16.4G 6,880ft 17.8s 14s
OK AeroTech K456 7.77lb 82ft/s 1,057ft/s 14.0G 6,887ft 18.0s 15s
OK Cesaroni J449 6.97lb 88ft/s 1,104ft/s 17.1G 6,926ft 17.7s 15s
OK Cesaroni K360 7.22lb 74ft/s 1,044ft/s 11.5G 7,055ft 18.3s 15s
OK AeroTech K2050 7.35lb 179ft/s 1,401ft/s 67.7G 7,055ft 17.0s 16s
OK Cesaroni J140 7.32lb 50ft/s 688ft/s 5.7G 7,071ft 20.6s 11s
OK Cesaroni K2045 7.34lb 173ft/s 1,444ft/s 70.5G 7,092ft 16.9s 16s
OK Gorilla K222 8.02lb 71ft/s 766ft/s 11.0G 7,105ft 19.6s 13s
OK Gorilla K555 7.98lb 85ft/s 1,139ft/s 17.8G 7,220ft 18.3s 16s
OK Cesaroni K454 7.57lb 81ft/s 1,097ft/s 15.3G 7,221ft 18.2s 15s
OK AeroTech K400 7.13lb 87ft/s 1,046ft/s 16.0G 7,223ft 18.4s 15s
OK Cesaroni K530 8.12lb 81ft/s 1,157ft/s 15.8G 7,226ft 18.2s 16s
OK Gorilla K520 7.68lb 83ft/s 1,132ft/s 16.8G 7,233ft 18.3s 16s
OK Gorilla K630 7.94lb 94ft/s 1,168ft/s 22.4G 7,258ft 18.0s 16s
OK Gorilla K533 8.28lb 80ft/s 1,112ft/s 18.7G 7,274ft 18.3s 16s
OK AMW K475 7.79lb 85ft/s 1,112ft/s 15.4G 7,310ft 18.4s 16s
OK KBA K700 7.81lb 102ft/s 1,241ft/s 25.7G 7,345ft 17.9s 16s
OK AeroTech K513 8.13lb 86ft/s 1,164ft/s 17.6G 7,408ft 18.2s 16s
OK AMW K535 7.94lb 87ft/s 1,133ft/s 17.3G 7,441ft 18.5s 16s
OK AeroTech K695 7.78lb 100ft/s 1,251ft/s 26.0G 7,442ft 17.8s 16s
OK AeroTech K535 7.29lb 100ft/s 1,170ft/s 18.8G 7,458ft 18.1s 15s
OK AeroTech K185 7.66lb 63ft/s 824ft/s 8.9G 7,600ft 20.0s 12s
OK AMW K610 8.39lb 90ft/s 1,164ft/s 19.0G 7,650ft 18.6s 16s
OK AMW K455 7.82lb 96ft/s 1,086ft/s 21.3G 7,690ft 18.6s 15s
OK AeroTech K1100 7.45lb 140ft/s 1,413ft/s 39.6G 7,766ft 17.7s 16s
OK AMW K935 7.82lb 120ft/s 1,347ft/s 30.7G 7,801ft 18.1s 16s
OK AMW K700 9.10lb 93ft/s 1,236ft/s 20.9G 7,850ft 18.7s 16s
OK Loki K690 9.79lb 88ft/s 1,226ft/s 19.2G 7,864ft 18.9s 17s
OK AeroTech K540 7.31lb 107ft/s 1,260ft/s 25.4G 7,926ft 18.1s 15s
OK AeroTech K550 7.78lb 98ft/s 1,203ft/s 22.6G 8,000ft 18.5s 15s
OK Cesaroni K940 7.51lb 121ft/s 1,449ft/s 32.1G 8,010ft 18.0s 16s
OK AMW K855 9.18lb 105ft/s 1,311ft/s 25.7G 8,036ft 18.6s 17s
OK Cesaroni K500 7.75lb 88ft/s 1,223ft/s 16.7G 8,050ft 18.8s 16s
OK Cesaroni K515 8.15lb 89ft/s 1,218ft/s 17.7G 8,196ft 19.0s 16s
OK Cesaroni K630 7.61lb 104ft/s 1,360ft/s 22.4G 8,217ft 18.4s 16s
OK Cesaroni K400 7.92lb 78ft/s 1,141ft/s 12.6G 8,218ft 19.4s 15s
OK Cesaroni K650 8.89lb 88ft/s 1,334ft/s 18.2G 8,250ft 18.9s 16s
OK Gorilla K700 8.28lb 94ft/s 1,325ft/s 21.2G 8,266ft 19.0s 17s
OK Gorilla K327 8.51lb 81ft/s 963ft/s 17.3G 8,271ft 19.8s 14s
OK Gorilla K763 8.45lb 97ft/s 1,364ft/s 23.1G 8,292ft 18.8s 17s
OK Cesaroni K445 7.58lb 95ft/s 1,183ft/s 18.8G 8,349ft 19.0s 15s
OK Gorilla K805 8.41lb 100ft/s 1,376ft/s 29.4G 8,382ft 18.7s 17s
OK AeroTech K805 7.90lb 106ft/s 1,410ft/s 24.9G 8,407ft 18.6s 16s
OK AeroTech K1103 7.72lb 145ft/s 1,550ft/s 46.0G 8,454ft 18.2s 17s
OK Cesaroni K520 7.97lb 88ft/s 1,274ft/s 16.4G 8,470ft 19.1s 16s
OK AeroTech K850 9.00lb 106ft/s 1,438ft/s 27.3G 8,488ft 18.8s 17s
OK AeroTech K990 9.15lb 103ft/s 1,419ft/s 26.5G 8,505ft 18.9s 17s
OK AMW K710 8.49lb 110ft/s 1,293ft/s 22.5G 8,547ft 19.1s 16s
OK AMW K670 8.66lb 104ft/s 1,319ft/s 20.8G 8,606ft 19.2s 17s
OK Cesaroni K160 7.75lb 57ft/s 775ft/s 6.8G 8,613ft 21.9s 12s
OK Cesaroni K740 7.74lb 109ft/s 1,474ft/s 24.8G 8,827ft 18.8s 16s
OK AMW K1250 8.50lb 137ft/s 1,550ft/s 41.8G 8,836ft 18.8s 17s
OK AMW K580 8.52lb 111ft/s 1,264ft/s 27.5G 8,861ft 19.5s 16s
OK Loki K250 8.45lb 87ft/s 922ft/s 20.3G 8,875ft 21.2s 14s
OK Loki K960 8.35lb 146ft/s 1,513ft/s 40.6G 8,896ft 18.8s 17s
OK Cesaroni K1200 8.10lb 139ft/s 1,675ft/s 37.5G 9,003ft 18.6s 17s
OK Cesaroni K650 8.27lb 107ft/s 1,430ft/s 32.5G 9,116ft 19.2s 16s
OK AeroTech K1275 8.88lb 140ft/s 1,606ft/s 39.1G 9,128ft 18.8s 17s
OK Cesaroni K635 8.40lb 94ft/s 1,417ft/s 20.0G 9,143ft 19.4s 16s
OK Cesaroni K675 8.78lb 94ft/s 1,396ft/s 22.2G 9,162ft 19.5s 16s
OK AeroTech K828 9.40lb 119ft/s 1,485ft/s 30.4G 9,163ft 19.3s 17s
OK Gorilla K980 9.92lb 107ft/s 1,443ft/s 30.0G 9,280ft 19.8s 18s
OK Cesaroni K780 8.25lb 112ft/s 1,581ft/s 26.3G 9,376ft 19.1s 16s
OK Loki K527 8.85lb 92ft/s 1,300ft/s 18.4G 9,382ft 20.2s 16s
OK Cesaroni K490 8.59lb 83ft/s 1,309ft/s 14.4G 9,425ft 20.1s 16s
OK Cesaroni K570 8.21lb 108ft/s 1,384ft/s 23.6G 9,592ft 19.7s 16s
OK Cesaroni K600 8.67lb 95ft/s 1,421ft/s 19.2G 9,639ft 19.9s 16s
OK AMW K1075 10.32lb 113ft/s 1,501ft/s 27.8G 9,704ft 20.2s 18s
OK Cesaroni K1440 8.67lb 155ft/s 1,825ft/s 48.6G 9,783ft 19.0s 17s
OK AeroTech K700 8.99lb 111ft/s 1,460ft/s 25.9G 9,808ft 19.7s 16s
OK Cesaroni K815 9.34lb 102ft/s 1,573ft/s 27.9G 9,857ft 19.8s 17s
OK Cesaroni K750 9.03lb 100ft/s 1,539ft/s 23.3G 9,900ft 19.7s 17s
OK KBA K1750 10.15lb 134ft/s 1,794ft/s 51.0G 9,942ft 19.6s 18s
OK Gorilla K1075 10.10lb 111ft/s 1,608ft/s 27.8G 10,125ft 20.3s 18s
OK Cesaroni K711 9.35lb 105ft/s 1,495ft/s 35.5G 10,141ft 20.1s 17s
OK Cesaroni K261 8.76lb 64ft/s 1,031ft/s 8.3G 10,144ft 22.3s 13s
OK AeroTech K480 9.08lb 104ft/s 1,371ft/s 21.6G 10,150ft 20.4s 16s
OK Loki K830 9.79lb 89ft/s 1,669ft/s 23.6G 10,167ft 20.4s 18s
OK Cesaroni K820 8.87lb 119ft/s 1,593ft/s 41.0G 10,167ft 19.8s 17s
OK AeroTech K270 9.13lb 69ft/s 994ft/s 9.5G 10,223ft 22.6s 14s
OK AeroTech K375 9.14lb 121ft/s 1,197ft/s 32.2G 10,344ft 21.0s 15s
OK AMW K1130 10.17lb 122ft/s 1,625ft/s 32.1G 10,351ft 20.3s 18s
OK Gorilla K1185 10.10lb 107ft/s 1,699ft/s 31.5G 10,362ft 20.3s 18s
OK AeroTech K1050 9.36lb 133ft/s 1,723ft/s 34.5G 10,373ft 19.9s 17s
OK AeroTech K455 9.54lb 120ft/s 1,241ft/s 30.0G 10,472ft 21.0s 16s
OK KBA K750 10.31lb 110ft/s 1,486ft/s 24.9G 10,477ft 20.7s 17s
OK Cesaroni K660 8.80lb 118ft/s 1,522ft/s 26.7G 10,502ft 20.2s 17s
OK KBA L2300 10.30lb 169ft/s 1,945ft/s 67.6G 10,642ft 20.1s 19s
OK Cesaroni K590 8.90lb 135ft/s 1,379ft/s 44.9G 10,692ft 20.5s 16s
OK AeroTech L1000 9.34lb 126ft/s 1,759ft/s 31.0G 10,716ft 19.9s 17s
OK Gorilla K470 9.63lb 105ft/s 1,271ft/s 23.9G 10,728ft 21.1s 16s
OK AeroTech L1090 9.86lb 118ft/s 1,688ft/s 29.2G 10,817ft 20.4s 17s
OK AMW L1276 11.03lb 117ft/s 1,692ft/s 30.6G 10,822ft 20.9s 19s
OK Cesaroni L1030 9.65lb 117ft/s 1,812ft/s 35.0G 10,910ft 20.1s 17s
OK AMW L985 10.17lb 116ft/s 1,643ft/s 31.5G 10,952ft 20.8s 18s
OK Cesaroni L990 9.43lb 127ft/s 1,765ft/s 37.8G 10,975ft 20.2s 17s
OK Loki L1400 10.10lb 132ft/s 1,879ft/s 40.6G 11,026ft 20.3s 18s
OK Cesaroni K260 9.01lb 72ft/s 1,078ft/s 9.8G 11,149ft 23.0s 14s
OK Cesaroni L805 10.02lb 115ft/s 1,646ft/s 32.2G 11,255ft 20.7s 17s
OK Cesaroni L730 9.45lb 119ft/s 1,606ft/s 28.0G 11,298ft 20.8s 17s
OK Loki K350 10.10lb 101ft/s 1,149ft/s 26.2G 11,503ft 22.8s 16s
OK Cesaroni L640 9.45lb 127ft/s 1,463ft/s 35.3G 11,676ft 21.2s 16s
OK Cesaroni L935 10.10lb 124ft/s 1,780ft/s 33.3G 11,785ft 20.9s 18s
OK Cesaroni K300 9.50lb 75ft/s 1,163ft/s 11.9G 11,860ft 23.3s 15s
OK AeroTech K250 9.38lb 62ft/s 1,133ft/s 9.6G 12,033ft 23.8s 14s
OK Cesaroni L265 9.97lb 67ft/s 1,106ft/s 9.5G 12,407ft 24.7s 14s
OK Loki L1040 11.03lb 118ft/s 1,969ft/s 26.4G 13,374ft 22.1s 18s
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 (43ft/s)
failedG AeroTech I115 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni I120 speed at end of launch guide too slow (47ft/s)
failedG AeroTech J90 speed at end of launch guide too slow (46ft/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.)

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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