Here are a few words from the author, a wind energy professional in Tehachapi, California, about the booklet:

"What should be understood first and foremost is that air has mass and weight. Under standard conditions it has a weight of about 2 pounds per cubic yard (1.2 kilograms per cubic meter). Think of a quart of water. The wing of an aircraft in flight or the blades of a wind turbine must redirect this substance, which becomes "weighty" in large volumes, to provide the forces necessary to achieve their purposes.

"In drawing the vector diagrams for the mass flow deflection processes involved it is quickly realized that the airflow across the wing of an airplane is directed downwards but not straight downwards. The vectors show that it must always have a small forward component as well. This forward component is the source of the induced drag that always accompanies lift and both vary as angular functions with the angle of attack. In producing lift, an angle of attack is necessary but not to the extent of producing excessive drag. In aircraft, then, the angles of attack of wings are generally maintained at low values for this reason. For wind turbine blades it is the opposite. Energy must be converted as efficiently as possible and so the angles of airflow deflection tend to be greater.

"This approach satisfies the basic laws of mass and momentum conservation in a satisfactory way.

"Included with this offer are five (now 10) progressive development PC programs written in BASIC which generate images on output screens of airfoils and airflow deflection patterns: JOUKWS01 to 03 and the FLWDEF series 01 to 09. The mathematical content is exactly the same as that found in college level textbooks, which are also seen throughout the aviation industry, but do not require a math background to run. The images may be tailored to meet specific requirements in solving problems and can be captured on file and printed out. The BASIC compiler, normally provided as part of PC DOS, is also included. These programs add another dimension of educational opportunities for the understanding of how lift is produced in wind energy blade applications.

"These basic concepts in wind energy at the detail of what happens to wind turbine blades all along their lengths form excellent studies for all those who have an interest in its development."

Purchase the booklet as both a PDF and HTML document for $4.95. These files, in full color, including the covers, may then be formatted for printing or electronic filing as desired. Download per a URL address received by e-mail. The ten airfoil and flow patterns PC programs in BASIC along with their compiler are sent as e-mail inserts. Just click on the PayPal button below and be sure to provide your e-mail address where requested:

Or send a check or money order in the amount of $4.95 for each copy of the above files made out to "Integrated Energies - Wind" at the following address:
Integrated Energies - Wind
21331C Golden Hills Blvd.
Tehachapi, California 93561