FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1921
1921 - 0523.PDF
AUGUST 4, 1921 it will best be understood from an inspection of the accom- panying drawings. The compression loads are taken on a steel shoe at the extreme end of the strut. For tension loads there is a forged fitting, divided so as to pass up some distance On each side of the strut. This forging is attached to the . strut by horizontal bolts passing through fitting and strut. An ingenious method has been employed for preventing this .-~ fitting from pulling off, and for this reliance has not been placed upon the horizontal bolts. Packing pieces of wood ' are glued on to the front and rear of the strut end in such a manner as to form a cone. Resting on this cone is a sheet- "Steel fitting made in two halves, which grip the cone fairly tightly. Short tubular lugs are welded on to the sides of the sheet-steel upper fitting and similar ones, presumably -forming part of the forging, are provided on the sides of the forked lug. Long vertical bolts pass through these lugs so glued inside the box spar thus formed in order to increase the area of glued surface. The ribs are of the usual construction- The wing bracing has already been dealt with, and the only other wing detail that calls for comment is the attachment of the wings to the centre section. The latter is permanently fixed on the fuselage by four sloping centre-section struts. For folding the wings, the struts are detached and the wing hinges around the front spar attachment to the centre section spar. The details of the fitting on the latter will be clear from the illustration. The lug on the end of the centre- section front spar is so attached that it can swivel in the spar fitting. Just outside the latter, and secured to the lug by set screws, is a collar which locates the lug in the direction of the spar axis. The procedure followed in folding the wings is as follows : The main front lift strut is detached and replaced by an SULK HEAD WINDOWS I '. •,—^—i£ ocoocS] I LhlClN££P I '• BULKHEAD POOR I ONCE RON STRUT WOOD STRUT THE SAB. P. 3 : Some details of the fuselage construction, etc. 1, Diagrammatic side and plan views of thefuselage, showing accommodation, etc. 2, Diagram of manner in which landing-shocks are transmitted to, and distributed over, the fuselage framework. 3, Lug attachment on lower longeron for wing strut. Note the threelong tie-rods running right across the fuselage. 4, Detail of corner brackets in fuselage. 5, Chassis strut fitting on lower longeron. 6, Attachment of centre-section struts to top longeron. 7, One of the formers of the fin, built into the fuselage. that, should any slack develop, which is scarcely likely owing to the fact that the upper fitting would tend to be drawn tighter and tighter on to the wood cone, it can be taken up on the vertical bolts without interfering with the strut, probably even without removing it from the machine. The fitting looks somewhat clumsy, but gives the impression of immense strength, although the welding on of tubular lugs for the long bolts would appear to be a possible source of weakness. Wing Construction IN the design of the Sablatnig, simplicity and ease of repairs are the fundamental considerations. For this reason wood construction has been adopted, with a minimum of metal parts. The wings, for instance, are built of wood throughout, the spar construction being as shown in the illustration. The flanges of the spar are of spruce, with walls of three-ply wood laid on in two diagonal layers. Corner strips are tacked and auxiliary strut provided for the .purpose. This is of such a length that when the wing is let down by the trailing edge— by casting off the attachment of the rear spar to that of the centre section—the auxiliary strut or prop just reaches the ground while supporting the wing in a horizontal, although edge-on, position. The axis of the bolt through the front spar centre-section lug is now vertical (it is, of course, hori- zontal when the wing is in flying position), and the whole wing may be swung back parallel to the fuselage, with its convex surface towards the body. On the top surface is a fitting which engages with the apex of a detachable^ pyramid secured to the sides of the fuselage, as shown in ohe of the photographs. The rear lift strut is left in place on the wing. The Tail Planes OWING to the proportion of the wing span to fuselage length, it has been necessary to arrange for folding up the 523
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
