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Aviation History
1946
1946 - 2087.PDF
OCTOBER 17TH. 1946 425 \ built integrally with the wing centre-section, and immediately forward of the front spar is a raking transport joint The pilot's controls, instruments, seat, and floor are allbuilt up as a separate unit sub-assembly—rather in the form of a chassis—which- is simply bolted at four attachment points to the front spar. The outstanding simplicity and great convenience of this arrangement make it appearodd that it has not been common practice in the past. Both of the 0.5m Browning guns are mounted in acast cradle anchored to the doubled frames in the fuse- lage nose, and their ammunition is housed in a box slungin the roof over the guns with chutes down to the breaches. The centre-section fuselage terminates at a transport jointat the rear spar station, and from this point back to the final transport joint immediately forward ofthe fin, the main body of the fuselage is a single monocoque unit. The structurethroughout is a very simple fabrication of beaded-angle stringersand light channel frames strengthened by fourdouble-channel longerons. The navigator's position is immediately rearward ofthe wing centre section and he sits facing forward on the port side. Behind his seat the various elements of radioequipment are stowed, and the operator is seated conveni- ently for access, also on the port side. Mounting for thethree cameras is built into the fuselage structure at the rear of the radio operator's station, and the " deadlight "ports for them are fatted in a trough formation which breaks very slightly the " keel" line of the fuselage. Structurally, the tail surfaces are perfectly conventional,but there are two .detail features at this end of the aircraft which are worthy of note. The first is the employment ofa single-piece " cruciform " casting for housing the main bearings of the rudder and elevator torque tubes. Thecasting is of magnesium alloy and incorporates a bracket extension for attachment to the rear fin post. The seconddetail is an ingenious device for maintaining the desired rigging tension in the elevator and rudder control cables.Twin cables for each control are used in the conventional manner together with horn leverspivoted at a common centre, but at right angles to the horn levers is a ground bar carrying a collar which bears against a coil spring surrounding the bar. Link rods from the collarare pivoted to rocking levers at the tip of each horn lever, and eachcable is attached to its appropriate rocking lever. Under applied load—that is with one cable under ten sion and its fellow under no load —the rocking lever pivots and, via the link rod, causes the collar to tiltand so to bind on the ground "bar; the whole thus becoming"solid" the control trans- mission is positive. How- HE STURGEON owing of the Sturgeon, h °f the machine may irihy of note is the very k; the mounting frames meras, with dinghy stow- >e exhaust flame dampers. ever, under no load condition,in each cable, the collar is not caused to bind and is thussubject to the tension of the spring behind it, and this,transmitted via the link rods and rocking levers to thecables, keeps them at the re- quired tension to compensatefor temperature change and physical stretch One other neat feature inthe fuselage is the entry door for navigator and radio opera-tor. This is fitted in the star board side immediately aft ofthe wing trailing edge; in point of fact, so closely is itpositioned up against the
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