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Cierva W 11 Air Horse

hesham

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Dear Jemiba,
the Cierva W-11T was enlarge version of W-11 with two 1620 hp Rolls-Royce
Merlin 502 engines,and W-12 project was to be fitted with Rolls-Royce Dart
turboprops .
British aircraft and projects;
Miles M-51 Minerva :experimental high wing passenger transport ,project.
Miles M-72 :four engined version of Aerovan,never completed.
Cranfield A1-400 Eagle , A-3 and ASTRA Hawk:light experimental aircraft.
 

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Jemiba

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Sorry, Derek Wood describes the W.11T as powered by" Mamaba or Dart". The
Merlim was used for the W.11 Airhorse and the "T" in the W.11T probably stands
for turbine. And the model clearly shows turbo engines on a heli, larger than the
W.11 ... but is it identical to the W.12 ?
 

hesham

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Dear Jemiba,

in my source the Cieva W-11T and W-12 were a different projects.
 
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Just call me Ray

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Stumbled upon this one in one of the Flight archives then did a little searching for it:


http://www.aviastar.org/helicopters_eng/west_w11.php


Never knew there was a three-rotor helicopter before!
 

Jemiba

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An interesting machine, indeed. BTW, in Derek Woods "Project Cancelled", the W.11T
is described as the Mamba or Dart powered variant, contrary to aviastar.org. But I don't
know which source is right.
 

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yasotay

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That would have taken some seriously spectacular gearing. Recall that in the early 1960's that the mighty CH-47 was having a difficult time keeping two rotors synchronized. On the positive side the helicopter would have had a very decent center of gravity range.
 

yasotay

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I wonder how significant the weight of the dynamic components was toward the aircrafts lift capability (circa 1949?). Of course in the new picture there is no rotor overlap so there would be no synchronization gear.
 

Stargazer2006

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From THE AMERICAN HELICOPTER VOLUME V, NO.II, January 1947

Model of the SPRAYING MANTIS or AIR HORSE designed by Pest Control Ltd. and the Cierva Autogiro Co., Ltd., and claimed to be exclusively for agricultural work. Photo shows model's full compliment of one hundred nozzles across a ninety foot span, capable of spraying 50 gallons of insecticide or fungicide per acre. Capable of carrying 3 to 4 tons from field to field at 80 m.p.h. it will cover 400 to 500 fields a day. Model incorporates 8 patents.

Now at least we know a little better what that strange helo had been designed for!
 

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alertken

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M.R.H.Uttley,Westland & the Br. Helicopter Industry, 45-60,Cass,2001 explores what was in MAP's mind when embarking on rotor proof-vehicles, 1944/45. W.11 began as heavylifter/casevac; crop spraying for the African groundnut scheme's ample funding may have served simply to relieve the Defence budget.
 

robunos

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Much more information to be found in 'Cierva's Triple Rotor Chopper', 'Aeroplane Monthly', January 1978, pp.4-10.

Quick and dirty summary, Cierva company re-formed in 1944 by Weirs, under c.g.Pullin as MD. Decided that project should be large 'bulk transport machine'.
This because complexity of helicopter made economical operation difficult if payload less than 1 1/4 tons.
Ministry of Ag. then became involved, causing design revision as 'Spaying Mantis' to CAOR 3/46, issued June 28, 1946. At this stage, the aircraft had two rotors at front, one at rear.
CAOR 3/46 superseded by spec. E19/46, and order for one prototype, now to revised layout with single rotor at front, and deep fuselage for cargo/passengers.
Second prototype ordered in early 1947. Flight testing revealed need to increase vertical fin area, and some resonance problems.
On the drawing board at this time was the W.11T, a version powered by two RR Merlins mounted on stub wings, able to be exchanged later for turboprops, and allowing for the use of auxiliary propellers for forward flight.
On June 13, 1950, the prototype crashed, killing all three on board, due to fatigue failure in the front rotor head.
As a result of this, both the Ministry and Weirs withdrew their financial support, effectively killing the project. The second prototype did some tethered testing in support of the crash investigation, where it was discovered the the fatigue was due to a particular vibration experienced only by the front rotor head. After further testing, it was dismantled and stored, before being scrapped in 1960.


cheers,
Robin.
 

flying-finn

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Some more pictures of the Air Horse
 

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Stingray

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Stargazer2006 said:
From THE AMERICAN HELICOPTER VOLUME V, NO.II, January 1947

Model of the SPRAYING MANTIS or AIR HORSE designed by Pest Control Ltd. and the Cierva Autogiro Co., Ltd., and claimed to be exclusively for agricultural work. Photo shows model's full compliment of one hundred nozzles across a ninety foot span, capable of spraying 50 gallons of insecticide or fungicide per acre. Capable of carrying 3 to 4 tons from field to field at 80 m.p.h. it will cover 400 to 500 fields a day. Model incorporates 8 patents.

Now at least we know a little better what that strange helo had been designed for!
 

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Stargazer2006

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Two more photos of the W.11 Air Horse:
 

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Mike Pryce

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From The Helicopter Museum
 

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hesham

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From Flightglobal 1949,

here is a Model for W.11T,but the engines was different in its configuration ?.
 

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masher47

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An earlier post mentions the weight problem with the drive train comparing it to the CH-47’s problems with its synchronization problem but then states the new drawings show no over lap. The W11 never had overlap, the rotor diameter limited by that criteria. A twin rotor can overlap with the rotors turning in opposite directions. I challenge anyone to explain how you have an over lapping three rotor helicopter. The earliest drawings showed over lap due to lack of information. The reason for the extreme out riggers is thus evident.
 

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