ROTOR PROPELLER AIRCRAFT TILTING THRUST TILTING THRUST DEFLECTION THE DUAL PROPULSION VTOL AIRCRAFT FAMILY DUCTED FAN TURBOJET JK ct-^ c ^CX VERTICAL TAKEOFF AND LANDING AIRCRAFT VERTICAL JOHN PAUL CAMPBELL bv sketches by Joseph S. Denn TAKEOFF AND LANDING AIRCRAFT THE MACMILLAN COMPANY NEW YORK A Division of The Crowell-Collier Publishing Company © JohnPaulCampbell 1962 All rights reserved. No part of this book may be re- produced in any form without permission in writing from thepublisher, except by a reviewer who wishesto quote brief passages in connection with a review writ- ten for inclusion in a magazineornewspaper. First Printing Library of Congress catalog card number: 62-8553 The Macmillan Company, New York Brett-Macmillan Ltd., Gait, Ontario Printed in the United States of America In memory of my father, Parker W. Campbell