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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 80 motors that fit and appear to have enough thrust (656 motors didn't fit, 55 motors failed safety checks). 135 motor had thrust curves available and 282 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 XXL 5.5 38mm
Owner: Jim Lane
Body Diameter: 5.54in
Dry Weight: 130.0oz
MMT Diameter: 38.0mm
MMT Length: 17.00in
CD: 0.52

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
warningsW AeroTech H283 138.7oz 62ft/s 142ft/s 7.7G 335ft 4.8s 4s
OK AeroTech H130 138.4oz 52ft/s 124ft/s 5.7G 348ft 5.1s 3s
OK Loki H144 141.9oz 51ft/s 143ft/s 5.3G 423ft 5.6s 4s
OK AeroTech H669 138.9oz 98ft/s 173ft/s 27.6G 424ft 5.1s 5s
OK AeroTech H219 139.2oz 57ft/s 160ft/s 6.6G 439ft 5.5s 4s
OK AeroTech H242 139.3oz 50ft/s 159ft/s 5.1G 460ft 5.8s 4s
OK Loki H160 141.8oz 55ft/s 159ft/s 6.3G 486ft 5.9s 4s
OK Cesaroni H400 140.0oz 70ft/s 191ft/s 10.4G 524ft 5.8s 5s
OK Cesaroni H225 136.8oz 53ft/s 190ft/s 5.8G 579ft 6.3s 5s
OK AeroTech I218 143.1oz 56ft/s 206ft/s 6.2G 699ft 7.0s 5s
OK AeroTech I180 143.6oz 63ft/s 196ft/s 8.1G 729ft 7.0s 5s
OK AeroTech H550 141.4oz 88ft/s 238ft/s 15.5G 737ft 6.7s 6s
OK AeroTech H550 141.1oz 88ft/s 239ft/s 15.5G 742ft 6.7s 6s
warningsW Cesaroni H565 142.8oz 86ft/s 242ft/s 15.1G 751ft 6.8s 6s
OK AeroTech H999 141.7oz 117ft/s 252ft/s 39.8G 772ft 6.7s 6s
OK AeroTech I225 147.1oz 49ft/s 224ft/s 5.8G 822ft 7.6s 6s
OK AeroTech I245 142.9oz 69ft/s 230ft/s 9.4G 837ft 7.4s 6s
OK AeroTech I357 142.1oz 64ft/s 237ft/s 8.6G 843ft 7.4s 6s
OK Cesaroni I566 143.6oz 82ft/s 279ft/s 14.5G 933ft 7.5s 7s
OK Cesaroni I195 144.7oz 48ft/s 242ft/s 4.9G 952ft 8.2s 6s
OK Cesaroni I345 143.9oz 65ft/s 278ft/s 8.7G 1,015ft 8.0s 7s
OK AeroTech I285 147.4oz 63ft/s 272ft/s 8.2G 1,037ft 8.2s 7s
OK Cesaroni I236 144.1oz 55ft/s 265ft/s 6.8G 1,048ft 8.4s 7s
OK Cesaroni I223 147.4oz 50ft/s 271ft/s 5.2G 1,091ft 8.6s 7s
OK Cesaroni I800 146.1oz 98ft/s 316ft/s 20.9G 1,092ft 8.0s 7s
OK AeroTech I211 146.0oz 57ft/s 261ft/s 6.9G 1,096ft 8.6s 6s
OK AeroTech I195 150.2oz 59ft/s 263ft/s 7.7G 1,119ft 8.6s 6s
OK AeroTech I305 150.5oz 65ft/s 284ft/s 8.8G 1,130ft 8.4s 7s
OK AeroTech I300 145.6oz 67ft/s 287ft/s 10.5G 1,136ft 8.4s 7s
OK AeroTech I1299 144.9oz 134ft/s 331ft/s 36.5G 1,138ft 8.0s 8s
OK Loki I316 149.0oz 75ft/s 305ft/s 11.1G 1,255ft 8.7s 7s
OK Cesaroni I287 151.3oz 56ft/s 312ft/s 7.2G 1,281ft 9.1s 7s
OK Loki I210 149.0oz 64ft/s 288ft/s 9.7G 1,303ft 9.1s 7s
OK Loki I405 149.2oz 89ft/s 335ft/s 18.4G 1,358ft 8.8s 8s
OK Cesaroni I285 147.8oz 58ft/s 323ft/s 7.6G 1,377ft 9.4s 7s
OK Cesaroni I255 148.2oz 57ft/s 320ft/s 6.7G 1,394ft 9.5s 7s
OK Loki I430 149.0oz 73ft/s 358ft/s 11.8G 1,435ft 9.2s 8s
OK Loki I377 149.8oz 82ft/s 341ft/s 14.8G 1,439ft 9.2s 8s
OK AMW I297 150.8oz 60ft/s 341ft/s 7.9G 1,470ft 9.5s 8s
OK AeroTech I327 152.2oz 66ft/s 347ft/s 9.2G 1,473ft 9.5s 8s
OK AeroTech I366 149.6oz 74ft/s 352ft/s 10.7G 1,480ft 9.4s 8s
OK AeroTech I364 153.9oz 64ft/s 347ft/s 8.7G 1,491ft 9.5s 8s
OK Cesaroni I303 147.6oz 64ft/s 344ft/s 9.1G 1,494ft 9.6s 8s
OK Cesaroni I242 149.4oz 52ft/s 332ft/s 5.9G 1,501ft 9.9s 8s
OK Cesaroni I470 147.5oz 76ft/s 376ft/s 12.6G 1,509ft 9.3s 8s
OK AeroTech I280 151.7oz 59ft/s 346ft/s 7.0G 1,522ft 9.8s 8s
OK AeroTech I435 148.3oz 89ft/s 387ft/s 17.3G 1,620ft 9.5s 8s
OK KBA I301 155.6oz 61ft/s 370ft/s 8.4G 1,627ft 9.9s 8s
OK Cesaroni I350 157.6oz 63ft/s 374ft/s 8.1G 1,628ft 9.9s 8s
OK AeroTech I284 149.6oz 72ft/s 370ft/s 10.7G 1,653ft 9.8s 8s
OK KBA I550 155.1oz 81ft/s 420ft/s 14.7G 1,655ft 9.6s 9s
OK AeroTech I500 150.3oz 79ft/s 418ft/s 12.8G 1,774ft 10.0s 9s
OK Cesaroni I216 151.2oz 55ft/s 355ft/s 7.1G 1,789ft 10.7s 8s
OK Loki J396 156.5oz 65ft/s 412ft/s 11.5G 1,811ft 10.2s 9s
warningsW Cesaroni I540 151.1oz 83ft/s 436ft/s 14.0G 1,811ft 10.0s 9s
OK AeroTech I600 151.2oz 96ft/s 436ft/s 18.5G 1,826ft 10.0s 9s
OK AeroTech I350 151.7oz 70ft/s 420ft/s 10.6G 1,832ft 10.3s 9s
OK Cesaroni J335 152.1oz 68ft/s 404ft/s 8.7G 1,833ft 10.4s 8s
OK Cesaroni J270 153.1oz 55ft/s 387ft/s 6.0G 1,837ft 10.7s 8s
OK AeroTech J420 152.9oz 75ft/s 419ft/s 12.1G 1,838ft 10.2s 9s
OK Cesaroni J285 151.0oz 62ft/s 392ft/s 7.7G 1,843ft 10.5s 8s
OK Cesaroni J381 154.3oz 72ft/s 415ft/s 10.8G 1,856ft 10.3s 8s
OK Cesaroni J316 151.4oz 66ft/s 397ft/s 9.4G 1,858ft 10.5s 8s
OK AeroTech J340 150.4oz 75ft/s 411ft/s 13.4G 1,866ft 10.3s 8s
OK AeroTech J350 153.5oz 89ft/s 422ft/s 18.3G 1,868ft 10.2s 9s
OK KBA J740 155.5oz 96ft/s 463ft/s 20.6G 1,872ft 10.0s 9s
OK Cesaroni J357 151.2oz 70ft/s 419ft/s 11.2G 1,881ft 10.4s 9s
OK AeroTech J425 152.3oz 66ft/s 444ft/s 9.5G 1,939ft 10.5s 9s
OK Cesaroni J290 153.3oz 62ft/s 405ft/s 8.2G 1,948ft 10.8s 8s
OK Cesaroni J400 154.8oz 70ft/s 440ft/s 10.0G 1,987ft 10.6s 9s
OK AeroTech J270 152.6oz 61ft/s 407ft/s 7.4G 2,009ft 11.0s 8s
OK AeroTech J500 153.1oz 88ft/s 471ft/s 17.6G 2,079ft 10.6s 9s
OK Loki J528 156.3oz 94ft/s 490ft/s 22.5G 2,118ft 10.5s 9s
OK Cesaroni J330 154.8oz 70ft/s 454ft/s 9.7G 2,199ft 11.2s 9s
OK Cesaroni J410 155.9oz 73ft/s 477ft/s 10.8G 2,220ft 11.1s 9s
OK AeroTech J435 152.0oz 85ft/s 491ft/s 15.3G 2,239ft 11.0s 9s
OK Cesaroni J425 154.7oz 80ft/s 485ft/s 14.6G 2,252ft 11.0s 9s
OK Loki J712 156.5oz 96ft/s 530ft/s 19.2G 2,278ft 10.8s 10s
OK Loki J320 156.5oz 69ft/s 463ft/s 11.2G 2,321ft 11.5s 9s
OK Cesaroni J354 157.4oz 69ft/s 472ft/s 10.9G 2,346ft 11.4s 9s

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 Contrail G130 speed at end of launch guide too slow (42ft/s)
failedA AeroTech G339 rocket doesn't reach a safe altitude (119ft)
failedG AeroTech G67 speed at end of launch guide too slow (26ft/s)
failedG Loki G69 speed at end of launch guide too slow (27ft/s)
failedG AeroTech G61 speed at end of launch guide too slow (24ft/s)
failedA Contrail G234 rocket doesn't reach a safe altitude (112ft)
failedG Loki G70 speed at end of launch guide too slow (28ft/s)
failedG Loki G94 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni G69 speed at end of launch guide too slow (23ft/s)
failedG Loki G80 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni G46 speed at end of launch guide too slow (16ft/s)
failedG Cesaroni G185 speed at end of launch guide too slow (46ft/s)
failedG Cesaroni G79 speed at end of launch guide too slow (25ft/s)
failedG Loki G66 speed at end of launch guide too slow (30ft/s)
failedG Cesaroni G60 speed at end of launch guide too slow (24ft/s)
failedG AeroTech G69 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni G58 speed at end of launch guide too slow (18ft/s)
failedG Cesaroni G115 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni G78 speed at end of launch guide too slow (26ft/s)
failedG Contrail G123 speed at end of launch guide too slow (43ft/s)
failedG Contrail G100 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni G50 speed at end of launch guide too slow (16ft/s)
failedA Contrail G300 rocket doesn't reach a safe altitude (85ft)
failedA Contrail H222 rocket doesn't reach a safe altitude (198ft)
failedG AeroTech H73 speed at end of launch guide too slow (23ft/s)
failedG Loki H100 speed at end of launch guide too slow (35ft/s)
failedG AeroTech H148 speed at end of launch guide too slow (44ft/s)
failedG AeroTech H123 speed at end of launch guide too slow (37ft/s)
failedG AeroTech H100 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (35ft/s)
failedG Loki H90 speed at end of launch guide too slow (36ft/s)
failedG Loki H125 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni H143 speed at end of launch guide too slow (37ft/s)
failedG Cesaroni H120 speed at end of launch guide too slow (37ft/s)
failedG AeroTech H112 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni H110 speed at end of launch guide too slow (32ft/s)
failedG Cesaroni H152 speed at end of launch guide too slow (42ft/s)
failedG AeroTech H178 speed at end of launch guide too slow (41ft/s)
failedG Cesaroni H125 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni H100 speed at end of launch guide too slow (32ft/s)
failedG AeroTech H170 speed at end of launch guide too slow (44ft/s)
failedG AeroTech H45 speed at end of launch guide too slow (24ft/s)
failedG AeroTech I161 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I140 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni I180 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni I212 speed at end of launch guide too slow (46ft/s)
failedG AeroTech I154 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni I170 speed at end of launch guide too slow (47ft/s)
failedG AeroTech I49 speed at end of launch guide too slow (16ft/s)
failedG Cesaroni I55 speed at end of launch guide too slow (18ft/s)
failedG Cesaroni I175 speed at end of launch guide too slow (44ft/s)
failedG AeroTech I59 speed at end of launch guide too slow (38ft/s)
failedG Loki I110 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni I125 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni J94 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.)

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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