Datcom by Holy Cows, Inc.
Home Demo videos Buy/Download FAQ
Questions
before you buy? Email Bill at
datcom@holycows.net
One user attempted to install Datcom+ Pro on
a MacBook running a parallel desktop with Windows 7, and it did not work, so
this configuration is NOT SUGGESTED.
A user has reported that it works fine under
Windows 11.
NO SALES TO
CHINA OR CHINESE CITIZENS, SORRY
NO SALES TO
RUSSIA OR RUSSIAN CITIZENS, SORRY
To purchase a licensed copy of the Datcom+
Pro package, follow these instructions
1. Download the RequestDatcomLicense program from this link.
2. Run this program on the
computer that you will be running Datcom+ Pro on. THE LICENSE CANNOT BE
TRANSFERRED TO ANOTHER COMPUTER. This program collects various bits of
information about your computer in order to generate a license. The file Datcom.req will be generated in a folder Datcom
on your desktop. Email this file to datcom@holycows.net
3. Purchase the license
through PayPal, using the same email address used when the license request file
is sent. Price is $29 US. PayPal will do the conversion for you. Please note
that there will be ABSOULTELY NO REFUNDS. Note: The PayPal page takes a while
to load. It’s their fault, not mine. To purchase more than one license, click
on the Buy Now button below, then on
the PayPal site, change the quantity to the number that you want to purchase.
1 Datcom license
4. A new license file will
be generated for your computer and sent via email back to you. Generally this
license file will be returned within 24 hours, 7 days a week, usually in much
less time. I’m usually at my computer from 7am to 10 pm Eastern Time (United
States). A link to the Datcom+ Pro package will also be
sent.
5. Install the Datcom+ Pro
installation package as well as the license package.
FREE VERSIONS
The free version is still available. It has
not been updated with features of the Datcom+ Pro version. I have
no way of generating a new distribution package without a LOT of work, and I’m
not interested in doing that right now. It is recommended that you view the
tutorial videos to see just how easy it is to use the new Datcom+ Pro.
You will see how powerful this new package is, and the time saved over the free
version. You will find that you are more efficient with the Datcom+ Pro
package than with the free version.
Downloads here:
Once installed, to run the Datcom+ or Datcom+
Pro program, you just double-click on one of the Datcom Input Files (with .dcm extension) in the Examples directory. If you just try
to run the digdat.exe program alone, it will not run correctly, and give you
error messages such as “open: No such file or directory” and “apparent state:
unit 5 named for005.dat”. This may also cause global warming.
B737 model
warning: This model came from the NASA reports on
Datcom from the 1970’s Their model is garbage. The
wing airfoil is nowhere close to correct. While finding the exact airfoil is
not possible, you can surely find something better than this symmetric airfoil.
Some users running the free version of
Datcom+ under Windows 10 have reported problems where a message says “Error
located in file: Citation.dcm” when they double-click
on a .DCM file, but it doesn’t happen to all users. I haven’t figured out when
it is triggered. If it happens to you, follow these steps:
1.
After installing the Datcom+ package, Press Windows key + r.
Type in “SystemPropertiesAdvanced.exe”.
2.
Click on the Environment Variables box.
3.
Change the environment variable for DATCOMROOT, removing the
leading and trailing double-quote. Save and get out of this.
4.
In the Datcom\bin directory on your desktop, edit the Datcom.bat
file. On lines 14, 15, and 16, remove the double-quotes (leading and trailing).
set PREDAT_PROGRAM="predat"
set DATCOM_PROGRAM="digdat"
set
DATCOM_MODELER_PROGRAM="datcom-modeler"
5.
You should be able to run the programs now.
These are the PDF files of
the original Datcom manual, 3070 pages of equations and methods that the
Digital Datcom program is based on. Not all of the paper manual is represented
in the computer program.
DATCOM
complete manual from 1978 (3070 pages, 76 Meg)
Or, you can download just the sections that you are
interested in, below:
Section_6_High_Lift_&_Control-2.pdf