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Aviation History
1947
1947 - 1375.PDF
AUGUST 21ST, .1947 185- is of levered-suspension type. Sketch also adjustable struts of rear tailplane spar, and the change from cable to rod control. lent view in all essential directions. An interesting feature of the Chipmunk is the comparative absence of electric and hydraulic gear. The flaps are hand-operated from either seat, and the fixed undercarriage uses rubber blocks in compression. Long experience has shown that this system, apart from the fact that it does away with expensive machining operations in manufacturing the legs, has a very long and trouble-free life, requiring little or no maintenance in the field. Structurally the Chipmunk is of simple but completely modern all-metal construction. The fuselage is a semi- monocoque, stressed-skin structure built in two sections. The rear section is of simple conical shape with no double curvatures. It is attached to the front portion just abaft of the rear seat by a reinforcing band riveted to the two sections. Thus in case of damage the fuselage can be dismantled fairly easily. In the front fuselage section, which con- The wing is attached to the fuselage at three points, at top and bottom of main spar and at the leading edge. The engine cowling is in three sections, while a separate nose sect/on is provided just behind the airscrew. GIPSY MAJOR IC ENGINE CRASH FRAME THROTTLE AND IIXTURE CONTROL FIXED-PITCH WOODEN AIRSCREW SfWGE OINT EUVATOR TMMMER HYDRAULIC BRAKES tains the cockpits, the stress-bearing skin is reinforced byfour longerons attached to pressed formers, and by modi- fied Z-section stringers. The fireproof bulkhead .closes thefrotnt part of the cockpit, and the engine bearers pick up on the forward ends of the top longerons, while the lowerlongerons take the engine-bearer bracing struts. The' prototype had built-up engine bearers, but in the secondmachine these members are tubular. The new structure is well triangulated and thus very strong, while still leavingthe engine very accessible. The engine cowling is in three sections, two of which hinge up to lay bare the sides of theengine, while a third section is under the engine. A separate nose section is interposed between cowling and airscrew.. .^ ,. . . .... - _ The wing is of the single- spar type, with the built-upspar forming a D-shaped box with the leading edge, whichis of stressed-skin construc- tion, reinforced by nose ribs-and span wise stringers. Aft of the main spar thecovering is fabric, and special strength-ened ribs carry false rear spars to whichflaps and ailerons are hinged. Eachwring-half is attached to the fuselage atthree points: one at the top flange of themain spar, one at the bottom flange,and one at the lead- ing edge. The fuse-lage is specially reinforced under thefront seat by a U- frame to take theconcentrated loads and carry themacross from side to side. Stressed-skin construc-tion is used for fin and tail- the design of the Chipmunk, close atten- n was paid to the layout of the cockpits, and many mock-up conferences were held before the final choice was made. The one finally chosen gives a width of 30in. and a depth under the canopy of 54in.
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