The Rocketry Forum

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  1. B

    Pitching Moments (OpenRocket technical documentation)

    This is my first post on this forum so I apologize if this post isn't in the right place, but I made my best guess as to where it might fit. I've been reading through the OpenRocket technical documentation, and after only just getting into it, I'm already a bit confused. It states that the...
  2. Dan Kusmer

    OpenRocket simulation drifts far when wind is 0 mph?

    I set the average windspeed to 0 mph. The simulation has the apogee at 4531 ft where the ejection charge fires. The ascent is near vertical. I delay chute decent deployment until 500 ft (Jolly Logic). The simulation has the rocket landing 6265 ft away from the launch site in 97 seconds after...
  3. Pilum

    3d export from OpenRocket ?

    Is this possible in any way? Export a 3d model from OpenRocket - in any format or a conversion ... This isn't for real modeling or 3D printing, this is for visualization, 3dmax there and the like;
  4. davdue

    OpenRocket Update Status?

    It's been 6 years since V15.0.3 was released. I see lots of emails on the lists about issues and I have a copy of a beta version 17.11-rc2.1 from 2018. At the minimum there are lots of AeroTech motors that have been approved that aren't in the database. It would be great to have an updated...
  5. O

    Stability is getting drop at before Apogee in Openrocket

    Hello, I am new at the Forum. Because of that ı don't any idea for Forum rules. Anyway. I am designing High Powered Rocket at Openrocket. Rocket flights 3.000 Meter (10.000 feet). But i have a problem with Static Margin at Apogee, when i simulated.As you can see below Graphic, my Rocket's...
  6. M

    Adding parts to the openrocket database?

    Hi everyone, is it possible to edit the parts database in OR? Based on the following lines from the wiki it seems doable but not easy: Implement GUI for creating components(?) Useful for manufacturers However I couldn't find a how to. Basically all I want to do is put in some non standard...
  7. JohnCoker API coming back

    I have made progress on the API. The "compatible" and new-style endpoints for metadata, search and download are working. This should enable RockSim and OpenRocket to download data again. If anyone else has programs that query and download data from, they should be working as...
  8. A

    Issues with OpenRocket

    Hello, recently I have been trying to open OpenRocket but have consistently run into issues where I would select any dropdown boxes and the entire program would freak out graphically. I have tried uninstalling and reinstalling Java as well as attempting to reinstall OpenRocket itself. I am...
  9. Kelly

    OpenRocket: How to ignore stability issues?

    I'm simming a short/stubby rocket with lots of base drag. To get an idea of stability, I add a massless transition cone at the tail as recommended elsewhere, and I get a stable rocket. To sim the altitude, I remove the transition. However now OpenRocket is telling me that the rocket...
  10. T

    Freefall in openrocket

    Hi, is there any way to simulate free fall / drop test from a certain altitude to landing point? Thanks.
  11. T

    Air launch in OpenRocket?

    Hi, basically, how do you simulate air launches in OpenRocket? Thanks.
  12. itb7

    OpenRocket center of Mass

    Hello everybody, I'm pretty new here, and looking for some advice on using OpenRocket to run a sim of a custom motor. I'm not certain how OpenRocket is supposed to do this, but I'd like to control the center of gravity for the motor, which will change for the first couple seconds of flight as...
  13. Alan R

    LOC 4" Micro-Magg .ork file

    I needed to sim some motors, and I couldn't find the 4" Magg file anywhere. This is down-scaled from the widely-available 5.5" Mini Magg. Most components from the DB. Some measurements are from my own rocket. The rest are just a guess. Posted here cause someone else might want this someday.
  14. T

    Wrong Size fo M2020

    Hello, me and my team are preparing for a rocket competition. We were given 2 engine options for us to use in our rocket. First choice is M2150 and second choice is M2020. We have to draw rockets in for 2 options. No problem for M2150. But the dimensions of the M2020 are incorrectly given in...
  15. N

    Automating OpenRocket Simulations

    Hi all, I am trying to find a way to automate OpenRocket to run many simulations sequentially, changing some variables between iterations. I.e. Start with a rocket setup, then run 500 simulations increasing the outside temperature 0.05 degC each iteration. Some ideas were interfacing with...
  16. Miles Goodson

    Open rocket stability number?

    Hi all, I just got Open Rocket to simulate an F powered rocket that I'm building, and for some reason, I can't get the stability number past 0.6! I've tried everything. Any ideas on what to fix?
  17. turkkusuroket

    High speed for lounchrod out

    Hi friends. I have a problem. I need speed of 25 m/s for lounchrod but my design speed is 32 m/s. If I increase mass, altitude is falling. How can reduce the lounchrod speed? Thanks friends:(
  18. neil_w

    How to ask an OpenRocket support question (or any other support question for that matter)

    I don't know is anyone will read this but I can only hope. Please note this is not directed at anyone in particular; it's a result of seeing the same pattern repeat over and over here and elsewhere. When asking for support with OpenRocket, or any other program for that matter, you need to...
  19. turkkusuroket

    I need to help for error.

    Hi everyone. I build a rocket in Open Rocket. I have a problem when run simulation. I uptaded .org file and a picture that shown error message. What is the solution of the error? Thanks
  20. turkkusuroket

    High Speed Error

    When we do the simulation, it gives warning that the parachute is opened at high speed. However, the parachute opens at the apogee point where the velocity of the rocket is 0 m / s. When we examine the graph, we see that the velocity at the opening point of the parachute is -0.5 m / s. However...