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Motor Guide Results

Here is your handy guide to the motors that might work with your rocket. We found 17 motors that fit and appear to have enough thrust (789 motors didn't fit, 5 motors failed safety checks). 22 motor had thrust curves available and 43 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:   MJH_Baby_Bertha
Owner: Mike Haberer
Body Diameter: 1.63in
Dry Weight: 3.0oz
MMT Diameter: 18.0mm
MMT Length: 70.00in
CD: 0.40

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 Estes B6 3.7oz 98ft/s 109ft/s 11.0G 205ft 3.8s 3s
OK Estes B4 3.7oz 87ft/s 110ft/s 11.0G 222ft 4.0s 3s
OK SCR B4 3.7oz 94ft/s 107ft/s 10.9G 231ft 4.1s 3s
OK Quest B6 3.6oz 113ft/s 124ft/s 13.4G 240ft 4.0s 3s
OK Quest B4 3.7oz 100ft/s 114ft/s 6.0G 245ft 4.2s 3s
OK Estes C5 3.9oz 108ft/s 175ft/s 18.7G 546ft 6.1s 4s
OK AeroTech C3 3.8oz 111ft/s 144ft/s 7.5G 578ft 6.5s 4s
OK Quest C6 3.7oz 104ft/s 193ft/s 16.7G 604ft 6.4s 4s
OK Estes C6 3.9oz 95ft/s 200ft/s 11.4G 611ft 6.5s 5s
OK SCR C3 3.9oz 97ft/s 172ft/s 10.3G 642ft 7.0s 4s
OK Quest C12 3.8oz 165ft/s 267ft/s 15.1G 676ft 6.2s 5s
OK Quest D16 3.9oz 190ft/s 337ft/s 18.7G 866ft 6.7s 6s
OK AeroTech D2 4.0oz 111ft/s 139ft/s 8.0G 1,238ft 11.4s 3s
OK AeroTech D10 3.9oz 202ft/s 416ft/s 21.0G 1,264ft 7.7s 6s
OK AeroTech D13 4.1oz 204ft/s 404ft/s 18.9G 1,283ft 7.8s 6s
OK AeroTech D24 4.1oz 243ft/s 470ft/s 33.9G 1,292ft 7.6s 7s
OK AeroTech D21 3.9oz 247ft/s 482ft/s 28.4G 1,296ft 7.6s 7s

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 1/2A6 average thrust fails 5:1 thrust/weight ratio (4:1)
failed5 Quest A6 average thrust fails 5:1 thrust/weight ratio (4:1)
failed5 SCR A3 average thrust fails 5:1 thrust/weight ratio (3:1)
failed5 Estes A8 average thrust fails 5:1 thrust/weight ratio (3:1)
failed5 Quest A3 average thrust fails 5:1 thrust/weight ratio (3:1)

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.

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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