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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 28 motors that fit and appear to have enough thrust (677 motors didn't fit, 86 motors failed safety checks). 112 motor had thrust curves available and 223 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:   Twitch DD custom DT
Owner: David Todd
Body Diameter: 3.00in
Dry Weight: 100.0oz
MMT Diameter: 29.0mm
MMT Length: 80.0cm
CD: 1.00

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 H410 106.4oz 74ft/s 169ft/s 16.6G 428ft 5.3s 5s
OK AeroTech H238 106.9oz 51ft/s 158ft/s 7.1G 429ft 5.5s 4s
OK Cesaroni H237 110.4oz 51ft/s 190ft/s 8.7G 570ft 6.2s 5s
OK AeroTech H220 108.8oz 54ft/s 190ft/s 9.1G 579ft 6.3s 5s
OK AeroTech H210 108.7oz 50ft/s 191ft/s 7.7G 589ft 6.3s 5s
OK Cesaroni H170 108.2oz 48ft/s 190ft/s 6.9G 621ft 6.6s 5s
OK AeroTech H180 108.9oz 50ft/s 201ft/s 7.5G 672ft 6.8s 5s
OK AeroTech H250 109.0oz 61ft/s 215ft/s 9.6G 708ft 6.8s 6s
OK KBA H225 111.1oz 48ft/s 218ft/s 7.9G 730ft 7.1s 6s
OK AeroTech H195 106.9oz 52ft/s 217ft/s 7.5G 745ft 7.1s 6s
OK Cesaroni H295 112.1oz 58ft/s 235ft/s 11.0G 802ft 7.2s 6s
OK Cesaroni H180 111.1oz 49ft/s 221ft/s 7.8G 811ft 7.4s 6s
OK Cesaroni H194 110.0oz 52ft/s 225ft/s 8.2G 816ft 7.4s 6s
OK Cesaroni H200 109.7oz 50ft/s 230ft/s 8.5G 845ft 7.5s 6s
OK Cesaroni H255 108.2oz 60ft/s 254ft/s 11.5G 946ft 7.7s 7s
OK Cesaroni H340 113.8oz 67ft/s 268ft/s 13.0G 980ft 7.8s 7s
OK Cesaroni H399 110.4oz 73ft/s 274ft/s 16.8G 993ft 7.8s 7s
OK Cesaroni H226 112.7oz 57ft/s 266ft/s 10.2G 1,069ft 8.3s 7s
OK AeroTech H268 112.6oz 58ft/s 278ft/s 9.6G 1,091ft 8.3s 7s
OK Cesaroni H160 111.3oz 55ft/s 252ft/s 9.2G 1,097ft 8.6s 6s
OK Cesaroni H233 111.6oz 57ft/s 275ft/s 10.0G 1,114ft 8.5s 7s
OK Cesaroni H255 111.2oz 61ft/s 286ft/s 12.3G 1,153ft 8.5s 7s
OK AeroTech I200 112.6oz 56ft/s 273ft/s 8.7G 1,168ft 8.7s 7s
OK Cesaroni I204 112.3oz 57ft/s 294ft/s 10.4G 1,296ft 9.1s 7s
OK AeroTech I205 111.1oz 51ft/s 295ft/s 10.8G 1,302ft 9.2s 7s
OK Cesaroni I224 113.1oz 62ft/s 321ft/s 12.8G 1,479ft 9.6s 8s
OK Cesaroni I243 114.1oz 59ft/s 327ft/s 12.7G 1,488ft 9.6s 8s
OK KBA J520 125.5oz 77ft/s 547ft/s 19.4G 2,708ft 12.1s 11s

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
failed5 Estes E16 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 AeroTech E23 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 AeroTech E16 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG AeroTech F23 speed at end of launch guide too slow (8ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (14ft/s)
failed5 AeroTech F27 average thrust fails 5:1 thrust/weight ratio (1:1)
failed5 Estes F15 average thrust fails 5:1 thrust/weight ratio (0:1)
failedG AeroTech F37 speed at end of launch guide too slow (13ft/s)
failedG AeroTech F62 speed at end of launch guide too slow (21ft/s)
failedG Cesaroni F36 speed at end of launch guide too slow (13ft/s)
failedG AeroTech F20 speed at end of launch guide too slow (10ft/s)
failedG Cesaroni F32 speed at end of launch guide too slow (8ft/s)
failedG AeroTech F42 speed at end of launch guide too slow (19ft/s)
failed5 Cesaroni F29 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG Cesaroni F31 speed at end of launch guide too slow (8ft/s)
failedG Cesaroni F120 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni F59 speed at end of launch guide too slow (23ft/s)
failed5 Estes F26 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG AeroTech F26 speed at end of launch guide too slow (5ft/s)
failed5 AeroTech F22 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG AeroTech F52 speed at end of launch guide too slow (24ft/s)
failed5 Apogee F10 average thrust fails 5:1 thrust/weight ratio (0:1)
failedG AeroTech F50 speed at end of launch guide too slow (23ft/s)
failedG Estes F50 speed at end of launch guide too slow (25ft/s)
failedG AeroTech F25 speed at end of launch guide too slow (16ft/s)
failedG AeroTech F40 speed at end of launch guide too slow (20ft/s)
failedG AeroTech G54 speed at end of launch guide too slow (25ft/s)
failedG AeroTech G104 speed at end of launch guide too slow (34ft/s)
failedG AeroTech G74 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni G88 speed at end of launch guide too slow (29ft/s)
failedG AeroTech G38 speed at end of launch guide too slow (15ft/s)
failedG AeroTech G53 speed at end of launch guide too slow (25ft/s)
failedG Cesaroni G80 speed at end of launch guide too slow (28ft/s)
failedG Estes G40 speed at end of launch guide too slow (22ft/s)
failedG AeroTech G77 speed at end of launch guide too slow (28ft/s)
failedG AeroTech G77 speed at end of launch guide too slow (27ft/s)
failedG Cesaroni G83 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni G57 speed at end of launch guide too slow (25ft/s)
failedG Cesaroni G68 speed at end of launch guide too slow (25ft/s)
failedG AeroTech G79 speed at end of launch guide too slow (25ft/s)
failedG AeroTech G79 speed at end of launch guide too slow (30ft/s)
failedG AeroTech G78 speed at end of launch guide too slow (30ft/s)
failedA Cesaroni G250 rocket doesn't reach a safe altitude (190ft)
failedG AeroTech G40 speed at end of launch guide too slow (22ft/s)
failedG Cesaroni G126 speed at end of launch guide too slow (38ft/s)
failedG AeroTech G25 speed at end of launch guide too slow (12ft/s)
failedG AeroTech G76 speed at end of launch guide too slow (36ft/s)
failedG AeroTech G64 speed at end of launch guide too slow (31ft/s)
failedG AeroTech G75 speed at end of launch guide too slow (29ft/s)
failedG Cesaroni G131 speed at end of launch guide too slow (36ft/s)
failedG AeroTech G125 speed at end of launch guide too slow (38ft/s)
failedG AeroTech G80 speed at end of launch guide too slow (31ft/s)
failedG AeroTech G75 speed at end of launch guide too slow (24ft/s)
failed5 Estes G80 average thrust fails 5:1 thrust/weight ratio (3:1)
failedG Cesaroni G106 speed at end of launch guide too slow (31ft/s)
failedG KBA G82 speed at end of launch guide too slow (27ft/s)
failedG KBA G135 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni G33 speed at end of launch guide too slow (11ft/s)
failedG AeroTech G138 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni G118 speed at end of launch guide too slow (36ft/s)
failedG Cesaroni G54 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni G125 speed at end of launch guide too slow (39ft/s)
failedG Cesaroni H133 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni H90 speed at end of launch guide too slow (34ft/s)
failedG AeroTech H165 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni H175 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni H163 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni H54 speed at end of launch guide too slow (26ft/s)
failedG Cesaroni H87 speed at end of launch guide too slow (30ft/s)
failedG AeroTech H115 speed at end of launch guide too slow (35ft/s)
failedG AeroTech H128 speed at end of launch guide too slow (43ft/s)
failedG Cesaroni H123 speed at end of launch guide too slow (35ft/s)
failedG AeroTech H97 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni H42 speed at end of launch guide too slow (18ft/s)
failedG Cesaroni H151 speed at end of launch guide too slow (44ft/s)
failedG RATT H70 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni H118 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni H135 speed at end of launch guide too slow (40ft/s)
failedG AeroTech H182 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni H160 speed at end of launch guide too slow (42ft/s)
failedG AeroTech H135 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni H53 speed at end of launch guide too slow (25ft/s)
failedG KBA H130 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni H140 speed at end of launch guide too slow (47ft/s)
failedG Cesaroni H159 speed at end of launch guide too slow (43ft/s)
failedG RATT I80 speed at end of launch guide too slow (30ft/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.)

5 The 5:1 thrust-to-weight ratio check is a useful rule of thumb, but it does break down for motors with unusual thrust curves. For example, motors with a high initial thrust and a long tail-off may fail this test but still be safe for use.

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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