And unfinished it is. One gets the impression of a work of art abandoned in mid flight by its inspired creators. Thankfully version 0.70 saw the introduction of multiple rotor/stator disks, along with a new solver which I have found to be efficient and robust. It quickly became clear, however, that some interface hacking would be required before effective work could be done with multiple rotors. So I started work and one thing led to another. Version ES1 fixed a lot of bugs and loose ends while adding enhancements to AERO, plotting, reporting, and multi-rotor functionality. ES2 introduces an entirely new facility in ESLOFT.

DFDC is apparently giving good data for low solidity rotors but is having problems with high solidity cases. Further work is required. My hope is that these enhancements will inspire continued development. Here's to Prof. Drela and Hal Youngren for creating this unique code, and to whoever decided to make it available under the GPL.

Download DFDC v070-ES2

DFDC_070ES2a.zip includes the complete DFDC v0.70 package with amended sources, additional sample cases, ESLOFT airfoil files, and documentation. Requires Unix/Linux/OSX with X11 support and C and Fortran compilers (not g77). Building on Windows has not been tested and will require work. (A gfortran binary with installer for Mac OSX can be downloaded here.)

Download DFDC_070ES2a.zip (1.8MB)

Documentation (text format, included in package)
Code changes
DFDC v070-ES1 User Notes
ESLOFT User Guide
ESLOFT Menus

Version ES2a is a minor update:

DEL command in AERO is fixed.
Section pitch axis is now on the camberline.
New DIH command for lofting blade dihedral along a circular arc.
Various minor fixes.

Introducing vES2 with ESLOFT

ESLOFT is fully integrated with DFDC and generates accurate lofts with minimum user input.