Hall BullDog Work Continues


Fabrication of the R/H Front and rear wing hinge flat patterns are complete, Fixturing in place front and rear hinge plates after heating and bending fabrication of wing hinge fittings and patch plates has been completed for the R/H Fuselage/wing stub assy.


With the center rear wing hinge fitting formed and welded in place , the front and rear .125″ 4130 doublers are added front and rear, they are edge welded to the ears of the first fitting and then the doublers are heated and formed around the center fitting and stub tubes and are welded. Next a third short doubler is added to the front and rear “ear” of the base hinge fitting , edge welded again and formed which completes the entire wing hinge assy.


This is the R/H Forward hinge fitting with the first fitting tack welded to the forward stub, heating and forming is next and then welding, the front and rear doublers get added as each piece of 4130 is heated and formed. The rear fitting in this view still needs the third doubler added to the front and rear “ears”.


Another view of the R/H fwd wing hinge base  fitting before the tack welds are doned.


With the front and rear wing hinge fittings welded in place a section of 1.125″ x .063″ is welded between the front and rear attach fitting/stubs. The third doubler is added and welded to the hinge ears and formed to the tube and final welded.


A view from the left side of the fuselage looking at the completed R/H Stub/wing attach assy. One can see the amount of patch plate fabrication, forming and welding that takes place in a scratch built airframe of this magnitude.


With fabrication of the L/H wing hinge stub fittings completed, work can begin on the L/H side of the stub wing assy.


With completion of the stabilizer front /rear spars and truss, 4130 tubes with three different diameters give the stabilizer it`s airfoil shape. The leading edge tube was formed separately before installing on the fixture.

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