Download or read book Science of Airplanes English Language Teaching (ELT) written by Douglas J Alford and published by Mfg Application Konsulting Engr. This book was released on with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Somehow seeing birds fly, makes sense to us. But what about an airplane that weighs as much as an elephant herd? How can heavy planes fly? See inside this book for the science of engine push; wing lift; drag back and gravity down. Moving air is the magic ingredient that enables flight.