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Page Date: 20. April 2002
Section 7
Description and Operation of Aircraft and Systems
Pilot´s Operating Handbook
EXTRA 300L
simply unlatching the canopy. For additional pilot protection a roll bar is installed behind the
rear pilots seat.
7.3
WINGS
The wing is of CRP construction. The dual chamber main spar - fullfilling the requirement for
fail safe design - consists of carbon roving caps combined with CRP webs. Core foam is a
PVC foam (Divinycell HT 50). The wing shell is built by a Honeycomb sandwich with CRP
Laminates. On the surface there is a protective layer of GRP. To prevent buckling of the
shell plywood ribs are used. In the area of the wingtanks is a layer of CRP laminate with an
incorporated aluminium thread bonded to the metal fuselage structure as means of lightning
protection.
The connection to the fuselage is arranged by two bolts piercing through the spar parallel to
the centerline of the fuselage and two brackets at the rear spars. Integral fuel cells are
provided in the leading edge of the wing extending from the root ribs to half the span of each
R/L and L/H wing. The ailerons are supported at three points in spherical bearings pressed
into aluminium brackets. To reduce pilot's hand forces the hinge line of the ailerons is
positioned 25% of the aileron depth at the root and 21,5% at the tip. Furthermore the
ailerons are equipped with "spades" to decrease pilot forces. Ailerons are controlled via the
center bracket. To prevent flutter the ailerons are weight balanced in the overhanging
leading edge.
7.4
EMPENNAGE
The EXTRA 300/L possesses a cruziform empennage with stabilizers and moveable control
surfaces. The rudder is balanced aerodynamically at the tip. Spars consist of PVC foam
cores, CRP caps and GRP laminates. The shell is built using honeycomb sandwich with
GRP laminates.
Deviating from the other control surfaces the spar webs of the surfaces of the elevator is
built by CRP. On the R/H elevator half a trim tab is fitted with two hinges. The control
surfaces are mounted in spherical bearings (exception: Trim tab). To prevent flutter rudder
and elevator are mass balanced. The balance weight for the rudder is installed in the rudder
tip while the balance weight for the elevator is mounted on the elongated center bracket of
the elevator extending into the fuselage.
Page Date: 31. March 2009
Summary of Contents for 300L
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