You know guy's not everyone has English as their mother tongue, I would like to see your efforts at Egyptian.
The book on here might help you
The
HELICOPTER
EXPERIMENTER'S
HANDBOOK
A valuable reference guide for the helicopter and gyroplane hobbyist. Includes: helicopter and gyroplane basics, rotorblade & hub designs; various homebuilt helicopters and gyroplanes with specs; a guide to construction materials; a glossary of terms; a list of suppliers of parts and materials; tables of weights, formulas, conversions, etc. Only $12.95
See
Homebuilt Ultralight G-1 Helicopter