openrocket motor placement in sustainer and in a stage?

[Antares Sky]

Hi there, new to this forum and a first time user of openrocket.
I have designed a rocket in the program and was able to get it assembled with a motor and run the sim, no problem. Then I decided to see what the effects of adding a stage to the bottom of the sustainer would be like. I was able to add the stage with fins, inner tube set as motor mount and can add a motor to it. But I'm not able to have a motor in the sustainer at the same time. I can only get openrocket to show a motor in the sustainer or the stage, but not both? What am I doing wrong?

See attached file.

Thanks
Glen

 

[neil_w]

First of all: A+ for including the ORK file with your question. Sincere thank you.

In order to have a motor in both stages, you need to configure two motors in the motor configuration:

Once you have motors configured for each stage (in the same configuration) then it'll do what you expect.

 

[Antares Sky]

First of all: A+ for including the ORK file with your question. Sincere thank you.

In order to have a motor in both stages, you need to configure two motors in the motor configuration: View attachment 682630

Once you have motors configured for each stage (in the same configuration) then it'll do what you expect.

Thanks for the quick reply!
I tried what you suggested, but still cant get it to show both motors in place at the same time. I'd like a D12-7 in the upper sustainer section and a D12-0 in the lower stage. can you possibly send me the corrected ORK file for me to play with?

Glen

 

[neil_w]

 

[Antares Sky]

View attachment 682678

Hey, Much thanks for the updated ork file!!!! that works well!
It's interesting that a single E12-6 will achieve almost as much altitude as the combined two D12s. The one E12 being more economical then two D12.

Glen

 

[neil_w]

Hey, Much thanks for the updated ork file!!!! that works well!
It's interesting that a single E12-6 will achieve almost as much altitude as the combined two D12s. The one E12 being more economical then two D12.

Well, an E12 has a bit less than twice the total impulse as two D12s, but also weighs quite a bit less, so there you go.

On the other hand, E12s have historically been more CATO-prone than D12s, although there have been some issues with D12s lately. Also a two-stage flight is a very different animal from a single-stage flight.

If pure altitude in a 24mm mount is what you want, then an Aerotech E20 is probably your best bet (among single-use motors, at least).

 

[Bruiser]

"It's interesting that a single E12-6 will achieve almost as much altitude"

Yeah, but a single E-12 isn't as cool to watch as two D12s doing the staging thing. I would bet it'll stage pretty low so you'll be able to see it well. Is your speed off the rod ok?

Disclaimer... Maybe you shouldn't stage. It's addictive, lol!

-Bob

 

[Antares Sky]

Neil, thanks for the heads up on the motor recall!

Bob, I can see how a two stage would be much cooler to see in action then a single stage!

Glen