convertiplane

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con·vert·i·plane

also con·vert·a·plane  (kən-vûr′tə-plān′)
n.
An airplane having the ability to take off and land vertically, as by the use of large propellers that tilt upward to provide thrust.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

convertiplane

(kənˈvɜːtəˌpleɪn) ,

convertaplane

or

convertoplane

n
(Aeronautics) an aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

con•vert•i•plane

(kənˈvɜr təˌpleɪn)

n.
an aircraft capable of vertical flight like a helicopter and forward flight like a conventional airplane.
[1945–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The agreement provides for the upgrade of VRT30 convertiplane for its effective operation in the climatic conditions of Eastern Siberia, the Far East and the Far North.
Another type of convertiplane is Dual-System [23], where multiple rotors are always directed upwards for vertical flight and another separate rotor for horizontal flight.
For example, Chapter One "The Dream" traces the early attempts to develop a "convertiplane," which although unsuccessful, still offered the promise that such technologies could eventually be made to work.
The XV-3 was one of three designs developed and tested under the US Army/Air Force Convertiplane Program, which aimed to achieve major improvements over simple helicopters in hover duration, cruise speed and range.
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