Open Rocket Motor Configurations

[davdue]

I exported the attached file from BurnSim but I can't get it to load into Open Rocket. I followed the FAQ text: "Instruct OpenRocket to load the files from another location. This can be done on the "Options" tab from the preferences. Thrust curves can be loaded from RASP motor files (.eng), RockSim engine files (.rse) or ZIP archives containing the same". Is my file have formatting issues or what am I doing wrong?

What manufacturer should it show up as?

View attachment KNSB 29-240 G-126.eng

 

[tim cubbedge]

Did you exit program & restart?
Is this the motor? If so it worked for me. It showed up as DDuerksen.

 

[davdue]

I have ran OR several times trying to get it to work. I'll try it on a different PC. My work PC has some different things set up on it.

 

[tim cubbedge]

Is the motor I showed above the motor in question?

 

[davdue]

Got it to work. I may have been missing it. Do you know how to get an ejection charge delay to show up?

 

[tim cubbedge]

You can enter whatever value you want in the "ejection charge delay" pulldown menu when you select motor.

 

[davdue]

You can enter whatever value you want in the "ejection charge delay" pulldown menu when you select motor.

No my only choice is 0. It has to be part of the ENG file I am thinking to allow the values to be selected. I have searched around and can't find a resource for the ENG file layout.

 

[Charles_McG]

You should be able to type the delay you wish, as well as picking from the drop down.

 

[tim cubbedge]

Just highlight the zero and enter new value.

 

[BDB]

Or type "None" to simulate a plugged motor. The software will assume you are planning electronic ejection by default.

 

[davdue]

Thanks learned something new about Open Rocket today.

 

[Handeman]

No my only choice is 0. It has to be part of the ENG file I am thinking to allow the values to be selected. I have searched around and can't find a resource for the ENG file layout.

Check one of the .eng files from a commercial motor. They have a string of number representing the delays available in the .eng file. Just use a text editor and add them in the right place to your file.

 

[davdue]

Check one of the .eng files from a commercial motor. They have a string of number representing the delays available in the .eng file. Just use a text editor and add them in the right place to your file.

Where would I find that? Only RASP files are available on Thrustcurve.

 

[Handeman]

RASP files are .eng files. They are just text files like this

;
;Estes D12 RASP.ENG file made from NAR published data
;File produced October 3, 2000
;The total impulse, peak thrust, average thrust and burn time are
;the same as the averaged static test data on the NAR web site in
;the certification file. The curve drawn with these data points is as
;close to the certification curve as can be with such a limited
;number of points (32) allowed with wRASP up to v1.6.
D12 24 70 0-3-5-7 0.0211 0.0426 Estes
0.049 2.569
0.116 9.369
0.184 17.275
0.237 24.258
0.282 29.73
0.297 27.01
0.311 22.589
0.322 17.99
0.348 14.126
0.386 12.099
0.442 10.808
0.546 9.876
0.718 9.306
0.879 9.105
1.066 8.901
1.257 8.698
1.436 8.31
1.59 8.294
1.612 4.613
1.65 0

This is for the Estes D12. The delays are listed on line #9 as 0-3-5-7
As long as you list your delays in the .eng file in the same manner, they should show up in the pull down choices in Open Rocket.
If you are using RASP or WRASP as your simulation program, don't list more than 7 delays. I'm not sure of the exact number any longer, could be 6 or 8, but if you list too many, it will crash the RASP/WRASP programs.