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Before fitting the joiners into the brass tubes for the first time, check that the
wire joiners are perfectly straight and burr free. When pressing the tail-plane
halves into place, you will feel a mild mechanical resistance which is
sufficient to hold the tail-plane halves securely in-place during flight.
Vertical stabiliser and rudder.
The fin post has been bonded into the trailing edge of the fin at the factory and the
rudder supplied in the kit requires only minimal finishing.
Open-up the rudder push-rod shroud at the rear of the fuselage using an 8-10mm
dia. round file or similar rotary tool.
Note: Customers building the ARC version may wish to take this opportunity to
adjust the profile of the leading edge of the rudder to match the trailing edge of the
fin.
Using a small round file; form a small semi-circular recess at the top of the fin post to
accommodate the leading edge of the rudder.
Carefully measure and mark the position of the two hinge points located 20mm from
the base of the rudder and 200mm apart along the leading edge of the rudder.
Transfer the position of the two hinge points onto the fin post and drill a 3mm hole at
each point to accommodate the supplied Nylon hinges. Work carefully to determine
the correct depth of the hinge points and to ensure equal and adequate rudder
throws. Trial fit the rudder and the hinges. Once satisfied with the positioning, glue
the hinges into place in the fin post using thickened epoxy. In the same way, glue the
protruding hinge points into the leading edge of the rudder.
Tip: Take care to avoid any epoxy finding its way into the hinge mechanism. Apply
a very small drop of oil (or suitable release agent) to the hinge-pin and check
periodically while the joint is curing. .
Rudder control horn.
Drill a 4mm hole in the base of the rudder to accommodate the eye-bolt which forms
the rudder control horn. The hole is to be 6mm from the base and 9mm from the
leading edge of the rudder. The hole in the eye-bolt is positioned centrally within the
rudder push-rod shroud and at 90° to the rudder itself.
Drill carefully, without piercing the outer skin of the rudder.
Once satisfied, bond the eye-bolt securely into the rudder using thickened epoxy
leaving a small bead of thickened epoxy around the base of the eye-bolt.
Note: Customers building the ARC version may wish to cover the rudder before
gluing the eye-bolt in place.
Customers building the ARF version will need to carefully remove a little of the
covering material around the fixing point.
Graupner GmbH & Co. KG * Henriettenstraße 94-96 * D- 73230 Kirchheim/Teck *
8
Fig 5. Rudder Hinges
Fig 6 & 7. Rudder Control Horn
www.graupner.de
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