Open Rocket Recovery Device Deployment at High Speed

I am getting this warning message in my simulation. I am new at rocket simulation so I am not sure what I need to change to fix this. Does the delay time need to be increased/decreased or something else. I can put a smaller motor in my simulation and it is fixed but my altitude drops from over a 1300 ft to only 657 ft. Any help would be appreciated. The rocket I am building is for a level one certification.

Usually this means that you either ejected early or ejected late. Run your simulation, then click on the plot tab. On the ride hand side of the screen there are "Events", make sure you have all events selected, and from the top dropdown select "Side profile".

Then click Plot Flight, and you should be able to see where the issue lies. See attached screenshot.

Sorry here's some more screenshots, so you can see where your ejection is happening I find the side profile graph the easiest.

Then when you want to nail down the delay, use the Total Motion vs. Time graph, and you can see how short/long you need to make your delay.

Davdue

We're good but we're not mindreaders.

When you ask for help with a simulation, you should tell us the diameter and the lift-off weight of the rocket, and the engine you are planning to use. If you provide this minimal information, anyone can perform a quick simulation, on any simulator, and see what the rocket should do, and then can give you advice.

Bob

Thanks Justin. I was able to reduce the delay time on various motors and fix the problem. I didn't know the side profile plot existed I was always using the Total Motion vs Time graph.

Awesome! Yeah, it takes a bit, but once you get used to OpenRocket you can usually find neat little tricks to figure out what you need. Glad to hear you got it sorted out.

Hello dear rocket brother ı working at rocket project but ı have one problem my problem is parachute desing ı must use 2 parachute so ı cant calculate first chute open at 3000-2600 meters to slow down 21m/s 2. chute open at 600 meters slow down to max9m/s so ı need help please help me

@ Davdue That is great advice on using the sideview plot. I find it to be most useful for visualizing exactly what is going on with the flight. However, after running the sim, the first thing I do is to look at the report columns "velocity at deployment" and "optimum delay". Based on these 2 data points you can quickly see what the problem is and if you need to increase or decrease the delay time. This works for simple single deploy rockets. If you are doing dual deploy, the problem may also lie in the size of the drogue.

Just realized that this is a REALLY OLD string!

@yasincelebi0666 If you need to set separate events for deployment, edit each chute and go to "Deploys at" and set each chute to deploy at the proper time.

In the future, you may want to start a new thread, rather than resurrecting one that is this outdated. Good luck with your parachute design.

bro sorry I cant calculated please help me