Rocketry Planet

Screenshot of BurnSim 3.0..119

Greg Deputy is happy to announce that BurnSim 3.0.119 has been released.  BurnSim is a solid rocket steady-state ballistic simulation software for the Windows® platform.

In a nutshell, input your motor, nozzle and propellant characteristics and BurnSim calculates the Kn through the burn and predicts estimated chamber pressure and motor performance. Once your motor design is in BurnSim, you can tweak the parameters such as nozzle diameter or grain core diameter and instantly see how the Kn, chamber pressure, and motor thrust is affected. BurnSim will also optimize your nozzle design.

Motor designs in BurnSim can be saved and recalled for later use.  In addition, test data can be imported and graphed alongside simulation data to compare sims to results.  BurnSim allows you to make notes about your propellants and motor designs, all saved in one convenient location.

Once you're happy with the your motor design, BurnSim can then export a .ENG file for use in RockSim, wRasp or other rocket flight simulators. You may also export the data to a text file (comma delimited) for use in virtually any system. You can estimate your motor's performance and rocket's flight before you even cast a grain!

Changes in BurnSim 3.0.119 include:

• New grain types: tablet (uninhibited bates) and pie segment
• Bugfix - inconsistent results when clicking buttons or changing fields with a sim running file association with .bsx
• Bugfix - files not loaded correctly when saved with 'use thrust coefficient' instead of nozzle calcs
• Added mass flow
• Added graph x axis start and stop for zooming in on the graph
• Bugfix - star major width values not displaying correctly in graph
• Bugfix - ctrl-c to stop simulation was not working
• Bugfix - if BurnSim was closed when max kn loop was running, would get into a loop and process would never die
• Bugfix - ENG export was using 'open' file dialog instead of 'save' file dialog
• Put back expansion ratio color coding
• Printing re-worked
• Bugfix - deleting all grains from a motor while sim is running caused a hang
• Bugfix - finocyl grain validation
• Bugfix - when opening older burnsim files without propellant data and the propellant isnt already in the system

BurnSim 3.0 licenses are being priced at $39.00, 2.x License holders can upgrade for $14. 

Visit http://www.BurnSim.com for details and downloads. 

Windows® is a registered trademark and .NET is a trademark of Microsoft Corporation in the United States and other countries.

Reader comments:

#1 Re: Article: Updated version of BurnSim is now ready for release

Hmmm 4-2009 added massflow to a massflow device calculator.

Nice tool. I recommend it.

Jerry

Just Jerry on 04-10-2009 11:34 PM

#2 Re: Article: Updated version of BurnSim is now ready for release

On two different computers if I use the .bsx files from 3.0.99 and set a max Kn, I get a totally
screwed up result with Kn's in the thousands and a nozzle size of .1 If I use a starting Kn number
I get normal calculated results.

I can walk up to my desired max Kn by inputting a starting Kn and going from there.

If I make a motor from scratch, I haven't seen this problem. It's only with my older files.
I emailed Greg but haven't heard back yet.

Anyone else see this characteristic?

Kurt

ksaves2 on 04-23-2009 06:12 PM

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