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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 12 motors that fit and appear to have enough thrust (768 motors didn't fit, 31 motors failed safety checks). 43 motor had thrust curves available and 92 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:   SARA Crayon
Owner: Kenneth B Weaver
Body Diameter: 16.00in
Dry Weight: 2,170.0oz
MMT Diameter: 98.0mm
MMT Length: 34.00in
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 AeroTech L2500 2,346.0oz 56ft/s 170ft/s 3.3G 556ft 6.7s 5s
OK Cesaroni L3150 2,336.9oz 66ft/s 188ft/s 4.6G 619ft 6.8s 5s
OK Cesaroni M2505 2,390.5oz 56ft/s 251ft/s 3.4G 1,165ft 9.6s 7s
OK AeroTech M2100 2,414.0oz 50ft/s 237ft/s 3.4G 1,197ft 9.9s 6s
OK AeroTech M2400 2,397.6oz 54ft/s 250ft/s 3.1G 1,209ft 9.8s 6s
OK AeroTech M4500 2,403.6oz 83ft/s 292ft/s 7.3G 1,231ft 9.0s 7s
OK Cesaroni M4770 2,399.4oz 80ft/s 300ft/s 7.8G 1,251ft 9.1s 7s
OK AeroTech M1845 2,405.7oz 48ft/s 233ft/s 2.6G 1,272ft 10.4s 6s
OK Cesaroni M6400 2,449.3oz 96ft/s 358ft/s 9.7G 1,566ft 9.8s 8s
OK AeroTech M2500 2,454.4oz 57ft/s 304ft/s 3.2G 1,672ft 11.3s 7s
OK AeroTech M6000 2,468.4oz 89ft/s 388ft/s 9.2G 1,783ft 10.5s 9s
OK Cesaroni M3400 2,456.0oz 65ft/s 353ft/s 4.7G 1,834ft 11.2s 8s

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 K680 speed at end of launch guide too slow (16ft/s)
failedG AeroTech K650 speed at end of launch guide too slow (10ft/s)
failedG Cesaroni K1620 speed at end of launch guide too slow (43ft/s)
failed5 AeroTech K458 average thrust fails 5:1 thrust/weight ratio (1:1)
failedA AeroTech K1999 rocket doesn't reach a safe altitude (170ft)
failed5 AeroTech L339 average thrust fails 5:1 thrust/weight ratio (0:1)
failedG AeroTech L1300 speed at end of launch guide too slow (35ft/s)
failed5 AeroTech L400 average thrust fails 5:1 thrust/weight ratio (1:1)
failedG AeroTech L952 speed at end of launch guide too slow (23ft/s)
failedG Cesaroni L610 speed at end of launch guide too slow (18ft/s)
failedG AeroTech L1500 speed at end of launch guide too slow (42ft/s)
failedG Cesaroni M1560 speed at end of launch guide too slow (39ft/s)
failedG AeroTech M1075 speed at end of launch guide too slow (27ft/s)
failedG AeroTech M1305 speed at end of launch guide too slow (39ft/s)
failedG AeroTech M1600 speed at end of launch guide too slow (40ft/s)
failedG AeroTech M1340 speed at end of launch guide too slow (38ft/s)
failedG Cesaroni M520 speed at end of launch guide too slow (20ft/s)
failedG Cesaroni M1060 speed at end of launch guide too slow (35ft/s)
failedG Cesaroni M1520 speed at end of launch guide too slow (40ft/s)
failedG Cesaroni M1290 speed at end of launch guide too slow (34ft/s)
failedG AeroTech M1419 speed at end of launch guide too slow (31ft/s)
failedG Cesaroni M1790 speed at end of launch guide too slow (40ft/s)
failedG AeroTech M1800 speed at end of launch guide too slow (43ft/s)
failedG AeroTech M2000 speed at end of launch guide too slow (47ft/s)
failedG AeroTech M750 speed at end of launch guide too slow (24ft/s)
failedG Cesaroni M1800 speed at end of launch guide too slow (44ft/s)
failedG Cesaroni M1890 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni M1450 speed at end of launch guide too slow (45ft/s)
failedG Cesaroni M795 speed at end of launch guide too slow (34ft/s)
failedG Cesaroni N1800 speed at end of launch guide too slow (44ft/s)
failedG AeroTech M1939 speed at end of launch guide too slow (45ft/s)

G These simulations were run with a launch guide length of 16ft (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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