You are correct DickNadine. The objective is to build and fly. One can get really lost in the process if you want.

Computers.

I've found myself going off on a tangent doing a sub program to take in airfoil data. Three days later I realize I'm behind schedule on my obligation to my customer.

The one thing that has saved my cahoonies is taking typing in high school. Found out that the freshman girls took typing so as a Junior I convinced a couple of buddies to take typing with me! I remember my dad having a fit as he could find no redeeming value in a guy taking typing in the early 60's.

As I've been building (off and on) since the age of eight I have mastered the carbon paper and pin method. Best book is Frank Zaic's book. Shows all the tricks to scaling with a simple ruler and paper. The book was first published in 1944. Now I use the confusser and CAD. Still do a bit of cheating with scanning and scaling into the CAD program.