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BUHL "Bull Pup" by Israel Baran (Plan and Article)
BUHL "Bull Pup" by Israel Baran (Plan and Article)

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BUHL "Bull Pup" by Israel Baran (Plan and Article)
Description: BUHL LA-1 "Bull Pup" by Israel Baran
Model Airplane News April 1975

Israel Baran demonstrates monocoque fuselage construction for maximum strength, minimum weight and fine scale appearance. Suitable for scale models where the fuselage is not fabric covered. Elimination of tissue covered fuselages means no more torn paper to patch when you're flying site isn't the all elusive long grass. Israel shows us how he uses a motor stick to wind rubber motors outside of the model . The nose block could incorporate thrust adjustment.

"Because most twisting and bending stresses are carried by the external skin rather than by an open framework, the need for internal bracing was eliminated or reduced, saving weight and maximizing space. One of the notable and innovative methods for using monocoque construction was employed by Jack Northrop. In 1918, he devised a new way to construct a monocoque fuselage used for the Lockheed S-1 Racer. The technique utilized two molded plywood half-shells that were glued together around wooden hoops or stringers. To construct the half shells, rather than gluing many strips of plywood over a form, three large sets of spruce strips were soaked with glue and laid in a semi-circular concrete mold that looked like a bathtub. Then, under a tightly clamped lid, a rubber balloon was inflated in the cavity to press the plywood against the mold. Twenty-four hours later, the smooth half-shell was ready to be joined to another to create the fuselage. The two halves were each less than a quarter inch thick. Although employed in the early aviation period, monocoque construction would not reemerge for several decades due to the complexities involved."
Keywords: Israel Baran, Buhl LA-1, Bull Pup, monocoque construction, motor stick
Date: 02.23.2021 10:39
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