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Neiva BN-1
The Neiva BN-1 was a high performance single seat sailplane designed in Brazil in the 1950s. It had national record and competition success and went into production for club use. ==Design and development==
The BN-1 was a conventionally laid out wooden single seat glider, with a high mounted cantilever wing . This had an aspect ratio of 19 and was built around a single I-section spar with 2° of dihedral. The leading edge and upper surface was formed from plywood, the underside fabric covered. The ailerons were wooden framed with fabric covering; the spoilers were wooden. The fuselage was a wooden monocoque with the cockpit and its moulded Plexiglas canopy just ahead of the leading edge. Behind the wing the fuselage was quite slender, carrying the cantilever tailplane just above it on a slight step. The vertical tail had a largely straight, slightly raked leading edge, with a small fuselage fillet and a rounded tip turning into a broad, curved edged rudder. The tail surfaces were all wood framed and fabric covered. The BN-1 landed on a forward skid and a retractable monowheel just aft of the centre of gravity
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