Crate,

I didn't pay the full price. I bought it used in excellent condition. Yes, I paid a little more than $100.00. But, the book looks new to me.

I have gone through the chapter that discusses airfoil shapes and their lift and stall characteristics. I wanted to understand the snappy characteristics of some aerobatic airplanes. In my particular case a NACA wing and the stall characteristics for 10%-15% airfoils. I had a Giles that I lost on landing approach. I always wondered what I did wrong. The model just flipped over to one side and hit the ground. So, I started to study the problem to try again.

Last year, I built another plane of the same model, this time with better understanding of the whole picture. I am still working on setting up the model correctly. So far, the model does not snap at all. I can do tight turns and pull on the elevator hard like any other sports plane with thicker airfoil with no problems.

The second incentive I had to buy the book was my 14-yr. son. He is wondering if he wants to study aerospace design engineering. So, I wanted to show him the level of math he has to go through and the kind of stuff he would be studying. He is at 9th grade taking 10th grade advanced placement math and he is acing the class with ease.