Rocketry Planet
| New BurnSim version out, fixes for Vista/Windows7 issues |
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| 2009 Archived News by Planet News | |
| Saturday, November 07, 2009 | |
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After a 6 month hiatus, BurnSim is back under active development and a bugfix release is now available. Updates include numerous bug fixes such as compatibility issues with Microsoft Windows® Vista and Windows 7, printing, and much more. The next update is focused on full support for metric units. If you've got a feature request, the time to get it in is now! BurnSim is a solid rocket steady-state ballistic simulation software package 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! Full details and free trial download are available at http://www.BurnSim.com/. Windows Vista® is a registered trademark and of Microsoft Corporation in the United States and other countries. |
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Arbitrary initial core shape or a draw tool to draw one.
Run same motor design with three different propellants to compare, or the same propellant with different core diameters or aspects to compare.
Key word compare.
Quick "Malewicki chart" of resulting motor at 3-4 diameters each at a range of practical masses. Alt vs weight vs diameter, coast vs weight vs diameter, peak velocity vs weight vs diameter.
Jerry
What did you just smoke!?!?!?! HUH? No wonder your motors never worked.
To comment on Greg's upgrade-
Wonderful program. Super upgrade. I ran the program against a known propellants thrust data and it came out within .01 percent of the actual!
Kudos to Greg.
Jerry, you're hard to read sometimes, but there is some good stuff there. Have you actually used BurnSim? Propellant characterization isnt in the current feature set, but there's plenty of spreadsheets (like at http://www.blastzone.com/characterization) and other tools out there to do it.
However, I have been thinking about putting that sort of stuff in BurnSim. IE, input pressure test data, get a burn rate plot with corresponding A and N. Thanks for reminding me about that.
Greg
Jerry, you're hard to read sometimes, but there is some good stuff there. Propellant characterization isnt [sic> in the current feature set, but there's plenty of spreadsheets (like at http://www.blastzone.com/characterization) and other tools out there to do it. However, I have been thinking about putting that sort of stuff in BurnSim. IE, input pressure test data, get a burn rate plot with corresponding A and N. Thanks for reminding me about that.
Greg
You're welcome.
I even told you how to simplify it for programming purposes if you want.
You have talked about arbitrary geometries, which I am in favor of.
"Burnsim". Hmmm. Burn rate vs pressure seems like a no brainer. Whether scientifically accurate or a WAG, at some level it is needed.
I have forgotten more about rocket motor design than most here, Tom in particular, have experienced, and the negative comments are just personal attack and in no way approximate actual experience.
If the "Mavericks" could withstand viable experienced participation in competition/participation with them, they would invite NON-TRA-MEMBERS.
But by limiting participation to Kool-Aid drinkers, we have a consensus. TRA rules, everybody else independent of experience drools.
On that note,
Jerry
TRA #12
Do I rule or drool?
A little movie.
A hybrid.
I think it is "fair" to say my motor is bigger than your motor.
Jerry, you're hard to read sometimes, but there is some good stuff there. Have you actually used BurnSim? Propellant characterization isnt in the current feature set, but there's plenty of spreadsheets (like at http://www.blastzone.com/characterization) and other tools out there to do it.
However, I have been thinking about putting that sort of stuff in BurnSim. IE, input pressure test data, get a burn rate plot with corresponding A and N. Thanks for reminding me about that.
Greg
As Tom says, “wonderful program”. For years, your program has been a mainstay for us east coasters, in particular us MDRA EX folks; time for me to upgrade to the new version, as my copy is way out of date, (way back from when you and I both had much less gray hair).
As a side note: Please don’t let the remarks of others give you pause for continuing the sustained constructive contributions you have made to the hobby over many years. The Blast Zone rocks---Thanks….
Fred
MDRA
ever pointed it out to Greg.
The tools for characterization are out there, the issue is applying them. I had a fellow answer one of my postings in a group one time about how hard it seems to be and turns out we had him come out to do a characterization class.
It just really helps to see someone actually explain the design of the neutral burning test engine and get the cores drilled as accurately as possible and doing the test firings, measuring chamber pressure and reducting the data.
Of course Burnsim is a tool that can be used with previously characterized propellants and can help one
who is in the process of trying to characterize a given mix.
ever pointed it out to Greg.