How to set Open Rocket for apogee ejection?

[Sooner Boomer]

I've looked through all the menus, and I can't see how to set OR for apogee eject, as one would get with an altimeter. I *suppose* I could just jigger the delay tome in the motor selection to show the same as the ideal time, but isn't there a better way?

 

[dhbarr]

I've looked through all the menus, and I can't see how to set OR for apogee eject, as one would get with an altimeter. I *suppose* I could just jigger the delay tome in the motor selection to show the same as the ideal time, but isn't there a better way?

Isn't it a setting on the chute?

 

[Sooner Boomer]

Isn't it a setting on the chute?

Yes. It doesn't seem to mater, and it gives "wonky" results with engines that have no delay (plugged motors).

 

[Handeman]

Just double click the parachute and on the bottom right, select apogee for Deploys at...

 

[dhbarr]

Yes. It doesn't seem to mater, and it gives "wonky" results with engines that have no delay (plugged motors).

Post one of your sims that's misbehaving?

 

[neil_w]

Double check the deployment settings in the "Motors & Configuration" tab.

 

[Handeman]

Double check the deployment settings in the "Motors & Configuration" tab.
View attachment 545124

Is that Open Rocket because I'm running the latest version 15.03 and it doesn't look anything like that.

 

[neil_w]

That's a 22.02 beta. Not much different, though, from 15.03:


Note that this is on a Mac, so the skin is quite different if you're used to Windows or Linux.

 

[Sooner Boomer]

One other question: if the ejection is set to apogee, why is there velocity at ejection? Shouldn't the velocity be zero?

 

[neil_w]

There can be horizontal velocity.

 

[Sooner Boomer]

There can be horizontal velocity.

How does OR know this? The winds are set to zero.

 

[waltr]

Be sure the WIND Standard deviation, & Turbulence are also ZERO. Then ensure you re-run simulation.
I tried with just wind = zero and still have velocity at deployment. Set the others to zero and velocity is now 0.6m/s (close enough to zero).

Add a plot axis for Total velocity to see non-verticle velocity.

I also sometimes set the X-axis to 'Position East of launch' to see the lateral distances that shows wind-cocking and chute drift.