The Cierva "Autogiro" Mark III (British) : Armstrong-Siddeley "Genet Major" Engine Page: 3 of 10
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N.A;C.A. Aircraft Circular No. 120
Constructi-on al Features
In the notes which follo,..thge..production type, C.19, Mark
III, may be assumed a.to be:ref.e'r.ed: ::'excet *he. otherwise
stated.. The fsoaela e.- ii:. -weled1 . ctel. :tube structure of normal.
welded construction. The forward end terminates in an engine
plate for the. "GCnot Mj. ". -105:hp enginei whil. at the rear. is
carried. the. biplane tail. (Fig.i ); This. consists of two vertical'
fins of -I;lded steel: tube t w6i ruitdders :of duralumin.;. a nd: tb .tail.
planes, -rlso o'f duralumin con structin'.. to which e.. hinged: the
duralulmin elevator flaps (Fig. 7). The control of the ta il sur..
.faces is :accomrlishcd-as shown in F''ig-ure 8.:'' '
The rotor ' bldes- are of mixed :construction in .that.the .sin-.
gl'e sprS :of the'rtor blades.'ar:e circular section stoel tubes,
1-3/4 inches in diameter and 20 .S.W.,7G., of high-tens.lc .'(:T.5) steel
and th rotor blade ribs. ar:c of wood in the: Mark ITa'(experimen-
tal) aircraft, but- it is likely that in the production type they
will be of duralumin. The covering of the blades is fabric, but. the
leading edge is covered with plywood,..up to. the -spar...(Fig. 9).
The ribs are very. closely. spaced (-3 in.)and all ribs are .provided
with metal flanges sweted 'to the tubular spar. In addition every
third rib is.bolted to2the spar (Fig. O10).: Owing to the close
spacingof the ribs, the load t be carrcd by each rib is .very.
small,'- and the f aCtor of safety. :provided by .the bolt ing of.ev.ery..
third rib is in the neighborhodd f .o''20. . .
In the experimental aircraft (Mark IIa), the rotor spars
are attached to the hinges of the rotor'h'ead by flanged couplings.
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The Cierva "Autogiro" Mark III (British) : Armstrong-Siddeley "Genet Major" Engine, report, June 1, 1930; (digital.library.unt.edu/ark:/67531/metadc64674/m1/3/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.