Convertawings « Quadrotor » designs (Models A to F)

luedo34

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Convertawings Model B
Does anybody have any info on this tiltwing project? Thanks!
 

luedo34

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Hm...nobody who has any information regarding this aircraft? Anthing would be greatly appreciated!
 

Jemiba

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Don't know at all, if it matches in any respect the Model B, but it's
the only Convertawings tiltwing design I have found on my HD ...
(from The Aeroplane 2/1959 )
 

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luedo34

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Thanks, at least something about a Convertawings aircraft. :)
A little late though, the Model B sems to be from the last 1940s. I didn´t know that the company was active until the last 1950s.
 

hesham

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Hi,

some info about the Model B and Model F;
This project has been designed to meet specifications by the United States
Air Force and the United States Navy. The end-product is to be a convertiplane
with two rotors and having an aircraft-helicopter configuration. The change-over
from one configuration to the other will be effected simply by swivelling the wing,
which has a four-bladed rotor at each tip. The blades, which are of small radius,
will rotate at high speed. The power plant planned for this project is two Boeing
502 turbines. A wing structure designed along the lines stated has already been
given prolonged tests on the test bed.

http://www.aviastar.org/helicopters_eng/convertawings_f.php
 

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Stargazer2006

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Convertawings was active at least until 1956, when they got a US Army contract for their Quadrotor prototype (which was the Model A - see here). The welded-tube prototype is on exhibit at the Long Island Cradle of Aviation Museum.
 

hesham

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hesham said:
Hi,

some info about the Model B and Model F;
This project has been designed to meet specifications by the United States
Air Force and the United States Navy. The end-product is to be a convertiplane
with two rotors and having an aircraft-helicopter configuration. The change-over
from one configuration to the other will be effected simply by swivelling the wing,
which has a four-bladed rotor at each tip. The blades, which are of small radius,
will rotate at high speed. The power plant planned for this project is two Boeing
502 turbines. A wing structure designed along the lines stated has already been
given prolonged tests on the test bed.

http://www.aviastar.org/helicopters_eng/convertawings_f.php

Isn't this the competition for XV-1,XV-2 and XV-3 convertiplane ?,
and if it is,that means the Model-B was involved in it.
 

Stargazer2006

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Very unlikely. The XV- competition took place circa 1952-53. The XV- designations were used from 1955. If the Convertawings Model A was a 1956 design, the Model B (which was a much more advanced derivative of the same concept) was a later design, so it could not be part of that same design competition.

When I visited the Long Island Museum back in 1993, I remember that the Convertawings Model A Quadrotor prototype had a sign that said the Army had purchased the prototype and given Convertawings a contract in 1959, I think. I have often wondered if this might be related to the undocumented H-44 designation... Anyway, it seems that the Quadrotor had no direct equivalent in other companies and was most likely an unsollicited initiative.
 

hesham

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And the Model or Type-E;

http://www.flightglobal.com/pdfarchive/view/1956/1956%20-%201564.html
 

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Stargazer2006

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Found this Quad-rotor design that pretty much looks like a much enlarged version of the Model A, but I could not guarantee this is actually a Convertawings project.
 

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Stargazer2006

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Convertawings Inc. Model E Quadrotor Transport

A transport helicopter for cargo, utility, passengers up to 14,000 lb. payload!


(from the original company brochure)
 

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Stargazer2006

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There are two versions of the Convertawings configuration. The small machine with intermeshed rotors (see Fig.1) is intended as a high-performance, compact military machine powered by four Continental Artouste II shaft turbines. This model permits economies in rotor design and should provide improved handling qualities.

The small high-speed rotors will extend the available speed range of the helicopter by reducing the high-speed vibration and control problems of conventional rotors. The thin blade sections possible will permit the higher forward flight tip speeds sought by the helicopter industry.

The large machine (Fig.2) is a commercial version intended to have moderate performance but excellent maintenance characteristics. The reduced blade size and gear reduction involved will permit economical mass production of the four identical rotor assemblies. In combination with the lifting booms and empennage, the basic stability advantage of the configuration should provide marked improvement over conventional helicopters and permit development of safe all-weather operating techniques.

(from AMERICAN HELICOPTER, October 1953)
 

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hesham

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I think it was a Model-B,


http://books.google.com.eg/books?id=1t4DAAAAMBAJ&pg=PA118&dq=popular+mechanics+vertiplane&hl=en&sa=X&ei=nxz_U8ezOOis0QWGr4HYDg&ved=0CCQQ6AEwAg#v=onepage&q=popular%20mechanics%20vertiplane&f=true
 

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hesham

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Hi,

http://archive.aviationweek.com/image/spread/19561210/14/2
 

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hesham

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The Model E ;

http://archive.aviationweek.com/image/spread/19540510/51/2
 

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hesham

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Hi,

here is a Model for Convertawings;

https://books.google.com.eg/books?id=HwhQK2taIRsC&pg=PA57&dq=burke+wilford+rotor&hl=ar&sa=X&ved=0ahUKEwiVy4fI2vTKAhXHnRoKHWZ7DvQQ6AEIWjAJ#v=onepage&q=burke%20wilford%20rotor&f=false
 

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hesham

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What is the source and the date for it ?.
 

hesham

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From Aviation magazine 1957,and as dear Maveric sent before,the whole article.
 

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