I have seen multiple requests for my rocket engine
performance estimator spreadsheet. These
requests are usually comments left on the “Rocket Engine Calculations” article
posted here on “exrocketman” 1 October 2022.
That spreadsheet was “liqrockets.xls”,
and the recommended worksheet in it was “allin1des”.
I have since reworked that spreadsheet analysis in a new
Excel file named “liquid rockets.xlsx”,
with the worksheet “r noz alt”,
which includes the propellant data library worksheet from the older
file, plus an isentropic compressible
flow worksheet for finding expansion Mach number and pressure ratio for a given
expansion area ratio.
This newer spreadsheet is the one I now recommend. It comes as an Excel file, plus a user manual as a pdf document, and a png file into which you paste a data
block generated by the spreadsheet, for
data reporting purposes.
There are 3 ways you can obtain this set of 3 files: (1) contact me by email and I can email them
to you, (2) you can go the New Mars
forums at newmars.com/forums/, and go to
the Meta New Mars section, and to the
thread titled “GW Johnson postings and @exrocketman1 youtube videos”, with the links in post #298 of that
thread, or (3) try to use the direct
link below. These are free downloads. You need to download the Excel spreadsheet
file to make it work. It has multiple
worksheets.
Direct link to engine performance spreadsheet:
Direct link to user manual for spreadsheet:
Direct link to the data reporting form:
This is what that data reporting form looks like:
This is a png file created in the old 2-D Windows “Paint”
utility. You cut out the example data
block, and paste in the one you created
with the spreadsheet. Then adjust the
headings above the engine sketch to match what you need.
I do recommend that you visit the New Mars forums and take a
look around. You should consider joining
the forums and participating. If you
would like to join, send an email
request to newmarsmember@gmail.com
PS -- I verified the links, they work.
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