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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 141 motors that fit and appear to have enough thrust (656 motors didn't fit, 14 motors failed safety checks). 155 motor had thrust curves available and 320 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:   Optima XL 4in
Owner: Jim Lane
Body Diameter: 4.00in
Dry Weight: 55.0oz
MMT Diameter: 38.0mm
MMT Length: 20.00in
CD: 0.80

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 Contrail G300 74.2oz 122ft/s 148ft/s 38.5G 308ft 4.3s 4s
OK Contrail G130 73.2oz 69ft/s 133ft/s 25.3G 309ft 4.5s 4s
OK Contrail G234 74.2oz 113ft/s 166ft/s 25.4G 399ft 4.9s 4s
OK Loki G69 63.5oz 48ft/s 146ft/s 4.6G 407ft 5.4s 4s
OK Loki G70 63.5oz 50ft/s 154ft/s 4.7G 452ft 5.8s 4s
OK Loki G80 64.0oz 53ft/s 163ft/s 5.3G 468ft 5.7s 4s
OK AeroTech G339 61.4oz 104ft/s 199ft/s 21.1G 474ft 5.3s 5s
OK Loki G94 63.5oz 56ft/s 174ft/s 6.4G 497ft 5.8s 4s
OK Contrail G123 73.0oz 67ft/s 183ft/s 16.5G 527ft 5.8s 5s
OK Contrail G100 73.0oz 63ft/s 179ft/s 8.0G 545ft 6.0s 5s
OK Loki G66 63.8oz 53ft/s 170ft/s 5.5G 555ft 6.3s 4s
OK Cesaroni G185 61.6oz 71ft/s 214ft/s 10.9G 556ft 5.8s 5s
OK Cesaroni G115 61.9oz 57ft/s 215ft/s 6.6G 626ft 6.4s 5s
OK Contrail H300 76.6oz 116ft/s 220ft/s 32.6G 627ft 6.0s 5s
OK Contrail H222 73.3oz 96ft/s 220ft/s 32.3G 638ft 6.1s 5s
OK Contrail H303 75.8oz 125ft/s 236ft/s 36.0G 687ft 6.3s 6s
OK Loki H100 66.8oz 55ft/s 259ft/s 6.6G 937ft 7.6s 6s
OK Contrail H246 76.1oz 104ft/s 292ft/s 24.2G 962ft 7.3s 6s
warningsW AeroTech H283 63.7oz 94ft/s 324ft/s 17.8G 974ft 7.2s 6s
OK AeroTech H148 65.9oz 69ft/s 301ft/s 9.5G 1,033ft 7.8s 6s
OK AeroTech H130 63.4oz 82ft/s 292ft/s 13.7G 1,046ft 7.7s 6s
OK Contrail H141 76.6oz 76ft/s 292ft/s 11.5G 1,066ft 7.9s 6s
OK AeroTech H669 63.9oz 146ft/s 385ft/s 61.3G 1,084ft 7.4s 7s
OK AeroTech H123 64.7oz 59ft/s 286ft/s 7.3G 1,127ft 8.3s 6s
OK AeroTech H100 64.2oz 54ft/s 289ft/s 6.1G 1,130ft 8.4s 6s
OK Loki H90 66.8oz 59ft/s 278ft/s 6.9G 1,151ft 8.5s 6s
OK Cesaroni H123 65.5oz 54ft/s 324ft/s 7.0G 1,155ft 8.3s 6s
OK Loki H144 66.9oz 79ft/s 321ft/s 12.4G 1,165ft 8.0s 6s
OK AeroTech H219 64.2oz 88ft/s 361ft/s 15.4G 1,165ft 7.9s 7s
OK Loki H125 67.1oz 70ft/s 307ft/s 10.0G 1,176ft 8.2s 6s
OK Cesaroni H143 67.2oz 55ft/s 335ft/s 7.4G 1,177ft 8.4s 7s
OK AeroTech H242 64.3oz 77ft/s 362ft/s 12.2G 1,223ft 8.1s 7s
OK Loki H160 66.8oz 85ft/s 348ft/s 14.5G 1,249ft 8.2s 7s
OK Cesaroni H400 65.0oz 105ft/s 424ft/s 23.3G 1,257ft 7.9s 7s
OK AeroTech H112 68.4oz 48ft/s 293ft/s 4.8G 1,285ft 9.2s 6s
OK Cesaroni H120 65.4oz 59ft/s 343ft/s 7.1G 1,305ft 8.8s 7s
OK Cesaroni H125 65.3oz 57ft/s 359ft/s 7.1G 1,335ft 8.8s 7s
OK Cesaroni H110 66.5oz 51ft/s 336ft/s 5.5G 1,336ft 9.0s 6s
OK Cesaroni H225 61.8oz 83ft/s 431ft/s 14.0G 1,387ft 8.4s 7s
OK Cesaroni H152 65.5oz 66ft/s 379ft/s 10.7G 1,393ft 8.8s 7s
OK AeroTech H178 66.4oz 63ft/s 402ft/s 10.2G 1,404ft 8.7s 7s
OK Cesaroni H100 66.5oz 51ft/s 341ft/s 5.4G 1,430ft 9.4s 7s
OK AeroTech H550 66.1oz 133ft/s 514ft/s 34.4G 1,498ft 8.3s 8s
OK AeroTech H550 66.4oz 132ft/s 509ft/s 34.1G 1,501ft 8.4s 8s
OK AeroTech H999 66.7oz 175ft/s 542ft/s 85.8G 1,516ft 8.3s 8s
warningsW Cesaroni H565 67.8oz 125ft/s 518ft/s 31.9G 1,517ft 8.4s 8s
OK AeroTech I218 68.1oz 84ft/s 436ft/s 14.1G 1,537ft 8.8s 7s
OK AeroTech H170 66.6oz 68ft/s 418ft/s 9.8G 1,566ft 9.1s 7s
OK AeroTech I180 68.6oz 96ft/s 405ft/s 18.0G 1,580ft 8.9s 7s
OK AeroTech I161 67.9oz 71ft/s 411ft/s 10.5G 1,622ft 9.2s 7s
OK Cesaroni I180 68.9oz 66ft/s 447ft/s 9.5G 1,637ft 9.3s 7s
OK AeroTech I175 67.3oz 80ft/s 414ft/s 12.4G 1,647ft 9.3s 7s
OK AeroTech I245 67.9oz 101ft/s 467ft/s 20.7G 1,671ft 8.9s 7s
OK AeroTech I140 67.6oz 63ft/s 397ft/s 8.5G 1,675ft 9.5s 7s
OK AeroTech I357 67.1oz 99ft/s 493ft/s 19.3G 1,678ft 8.9s 8s
OK AeroTech I225 72.1oz 70ft/s 459ft/s 12.3G 1,687ft 9.2s 7s
OK Cesaroni I212 71.8oz 68ft/s 475ft/s 11.1G 1,715ft 9.4s 8s
OK Cesaroni I566 68.6oz 117ft/s 587ft/s 31.1G 1,717ft 8.8s 8s
OK AeroTech I154 72.4oz 58ft/s 397ft/s 7.3G 1,846ft 10.3s 7s
OK Cesaroni I800 71.1oz 140ft/s 654ft/s 42.3G 1,852ft 9.0s 8s
OK Cesaroni I345 68.9oz 99ft/s 570ft/s 19.4G 1,857ft 9.3s 8s
OK AeroTech I1299 69.9oz 194ft/s 688ft/s 76.7G 1,869ft 8.8s 8s
OK Cesaroni I195 69.7oz 73ft/s 490ft/s 11.2G 1,883ft 9.7s 8s
OK AeroTech I285 72.4oz 90ft/s 538ft/s 17.7G 1,893ft 9.4s 8s
OK Cesaroni I170 68.8oz 71ft/s 502ft/s 10.7G 1,934ft 9.9s 7s
OK Cesaroni I236 69.1oz 79ft/s 531ft/s 15.2G 1,946ft 9.7s 8s
OK Cesaroni I175 70.4oz 65ft/s 488ft/s 8.7G 1,953ft 10.0s 8s
OK AeroTech I305 75.5oz 92ft/s 548ft/s 18.4G 1,958ft 9.5s 8s
OK AeroTech I300 70.6oz 100ft/s 563ft/s 22.7G 1,989ft 9.5s 8s
OK Cesaroni I223 72.4oz 75ft/s 536ft/s 11.6G 1,999ft 9.8s 8s
OK AeroTech I211 71.0oz 84ft/s 508ft/s 15.2G 2,000ft 9.8s 7s
OK AeroTech I195 75.2oz 87ft/s 503ft/s 16.3G 2,018ft 9.9s 8s
OK Loki I316 74.0oz 107ft/s 577ft/s 23.2G 2,091ft 9.6s 8s
OK Cesaroni I287 76.3oz 81ft/s 598ft/s 14.4G 2,146ft 10.0s 8s
OK Loki I405 74.2oz 133ft/s 632ft/s 38.0G 2,147ft 9.6s 8s
OK Loki I210 74.0oz 92ft/s 538ft/s 20.5G 2,207ft 10.0s 8s
OK Cesaroni I285 72.8oz 85ft/s 613ft/s 16.4G 2,248ft 10.1s 8s
OK Loki I430 74.0oz 105ft/s 690ft/s 24.9G 2,251ft 9.8s 9s
OK Loki I377 74.8oz 121ft/s 631ft/s 30.7G 2,253ft 9.8s 8s
warningsW Loki I110 75.8oz 61ft/s 445ft/s 11.5G 2,259ft 11.0s 7s
OK Cesaroni I470 72.5oz 113ft/s 725ft/s 26.7G 2,284ft 9.8s 9s
OK AeroTech I366 74.6oz 107ft/s 657ft/s 22.6G 2,289ft 9.9s 8s
OK Cesaroni I255 73.2oz 85ft/s 603ft/s 14.4G 2,289ft 10.2s 8s
OK AeroTech I327 77.2oz 94ft/s 651ft/s 19.2G 2,298ft 10.0s 8s
OK AeroTech I364 78.9oz 90ft/s 639ft/s 17.5G 2,309ft 10.1s 8s
OK AMW I297 75.8oz 89ft/s 639ft/s 16.7G 2,319ft 10.1s 8s
OK Cesaroni I303 72.6oz 90ft/s 647ft/s 19.5G 2,343ft 10.1s 8s
OK AeroTech I435 73.3oz 131ft/s 723ft/s 36.1G 2,371ft 9.8s 9s
OK AeroTech I280 76.7oz 84ft/s 641ft/s 14.8G 2,385ft 10.3s 8s
OK KBA I550 80.1oz 114ft/s 752ft/s 27.1G 2,404ft 10.1s 9s
OK Cesaroni I242 74.4oz 81ft/s 611ft/s 12.8G 2,414ft 10.5s 8s
OK Cesaroni I350 82.6oz 93ft/s 678ft/s 16.5G 2,456ft 10.4s 9s
OK AeroTech I284 74.6oz 104ft/s 671ft/s 22.2G 2,457ft 10.2s 8s
OK KBA I301 80.6oz 85ft/s 643ft/s 17.0G 2,471ft 10.5s 9s
OK AeroTech I500 75.3oz 109ft/s 781ft/s 26.6G 2,505ft 10.0s 9s
warningsW Cesaroni I540 76.1oz 117ft/s 812ft/s 28.8G 2,518ft 10.0s 9s
OK AeroTech I600 76.2oz 141ft/s 804ft/s 37.8G 2,522ft 10.0s 9s
OK AeroTech I59 72.2oz 59ft/s 314ft/s 7.3G 2,530ft 13.4s 5s
OK KBA J520 80.5oz 108ft/s 781ft/s 30.8G 2,564ft 10.3s 9s
OK KBA J740 80.5oz 140ft/s 866ft/s 40.0G 2,567ft 10.1s 9s
OK AeroTech I350 76.7oz 102ft/s 758ft/s 21.4G 2,593ft 10.3s 9s
OK Loki J396 81.5oz 93ft/s 739ft/s 21.7G 2,595ft 10.4s 9s
OK AeroTech J420 77.9oz 109ft/s 750ft/s 24.8G 2,595ft 10.3s 9s
OK AeroTech J350 78.5oz 129ft/s 752ft/s 36.8G 2,596ft 10.2s 9s
OK Cesaroni I125 77.8oz 68ft/s 469ft/s 11.4G 2,612ft 11.7s 7s
OK Cesaroni J381 79.3oz 102ft/s 743ft/s 22.0G 2,622ft 10.4s 9s
OK AeroTech J340 75.4oz 109ft/s 734ft/s 27.7G 2,626ft 10.3s 8s
OK Cesaroni J335 77.1oz 95ft/s 722ft/s 18.2G 2,640ft 10.5s 9s
OK AeroTech J520 81.7oz 134ft/s 762ft/s 38.6G 2,648ft 10.3s 9s
OK Cesaroni J357 76.2oz 102ft/s 749ft/s 23.3G 2,657ft 10.4s 9s
OK Cesaroni J285 76.0oz 89ft/s 697ft/s 16.0G 2,685ft 10.7s 8s
OK AeroTech J425 77.3oz 96ft/s 805ft/s 19.2G 2,689ft 10.5s 9s
OK Cesaroni J316 76.4oz 94ft/s 706ft/s 19.6G 2,712ft 10.7s 9s
OK Cesaroni J270 78.1oz 78ft/s 682ft/s 12.5G 2,714ft 10.9s 8s
OK Cesaroni I216 76.2oz 80ft/s 624ft/s 15.0G 2,720ft 11.0s 8s
OK Cesaroni J400 79.8oz 99ft/s 774ft/s 20.1G 2,737ft 10.5s 9s
OK Loki J474 81.7oz 137ft/s 749ft/s 51.7G 2,742ft 10.4s 9s
OK AeroTech J500 78.1oz 129ft/s 829ft/s 35.5G 2,758ft 10.3s 9s
OK Loki J528 81.3oz 132ft/s 870ft/s 44.2G 2,773ft 10.3s 9s
OK Cesaroni J290 78.3oz 91ft/s 708ft/s 17.0G 2,782ft 10.9s 8s
OK AeroTech J575 87.2oz 133ft/s 878ft/s 35.1G 2,807ft 10.3s 9s
OK AeroTech J270 77.6oz 86ft/s 710ft/s 15.6G 2,844ft 11.0s 8s
OK Loki J712 81.5oz 135ft/s 946ft/s 37.8G 2,905ft 10.5s 9s
OK AeroTech J435 77.0oz 119ft/s 855ft/s 31.2G 2,917ft 10.6s 9s
OK Loki J326 82.0oz 119ft/s 697ft/s 41.8G 2,942ft 11.0s 9s
OK Cesaroni J410 80.9oz 104ft/s 820ft/s 21.7G 2,943ft 10.8s 9s
OK Cesaroni J425 79.7oz 115ft/s 835ft/s 29.2G 2,945ft 10.7s 9s
OK Cesaroni J330 79.8oz 100ft/s 775ft/s 19.8G 2,972ft 11.0s 9s
OK Cesaroni J520 85.0oz 111ft/s 901ft/s 26.7G 3,029ft 10.8s 9s
OK Cesaroni J94 78.3oz 53ft/s 438ft/s 6.5G 3,051ft 13.5s 7s
OK Cesaroni J354 82.4oz 102ft/s 783ft/s 21.7G 3,098ft 11.1s 9s
OK Cesaroni J580 91.8oz 111ft/s 916ft/s 25.2G 3,112ft 11.0s 9s
OK AeroTech J825 85.9oz 153ft/s 1,080ft/s 48.3G 3,173ft 10.6s 10s
OK Cesaroni J595 85.5oz 124ft/s 982ft/s 37.3G 3,320ft 11.0s 9s
OK Cesaroni J600 87.0oz 125ft/s 1,019ft/s 29.0G 3,327ft 11.0s 9s
OK AeroTech J570 86.8oz 151ft/s 938ft/s 46.8G 3,438ft 11.0s 9s
OK Cesaroni J394 88.1oz 92ft/s 888ft/s 17.1G 3,439ft 11.5s 9s
OK Cesaroni J453 89.0oz 113ft/s 913ft/s 28.4G 3,475ft 11.4s 9s
OK Cesaroni J420 85.8oz 119ft/s 908ft/s 31.9G 3,505ft 11.4s 9s
OK Cesaroni J530 89.5oz 127ft/s 1,004ft/s 31.4G 3,623ft 11.3s 9s
OK Cesaroni J150 88.5oz 70ft/s 582ft/s 12.2G 3,904ft 13.8s 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
failedG AeroTech G67 speed at end of launch guide too slow (46ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni G46 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (44ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (33ft/s)
failedG AeroTech H73 speed at end of launch guide too slow (41ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (43ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (35ft/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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