QBIT
plant configuration, you can transition to a pressure fuel system by adding the bladder. The crème de resistance was when the models in this series got upgraded to pres- sure
fuel system with some help from George Avila about the operational consid- erations. Graduate to the pressure system when you have your wings back. An aerodynamic improvement was a thin-
ner lower drag Neelmeyer airfoil going from 12% to a 9% thickness at Don DeLoach’s urging.
If you are an active flier, start with the ra- dial mount/pressure system and have your chase bike ready.
Now to the workbench Wing construction: A flat building board surface is a must. The Warren truss
structure resists warping so if you build on a warped surface, you won’t get it out. Being a pylon model, you will need 1⁄8 inch washin in the right wing main panel. In lieu of this, a piece of 1⁄2-inch trailing edge stock attached on the underside of the right main panel at the dihedral break may be used to provide washin.
Notch the inside of the leading and trailing edges where the rib attaches to provide a lit- tle extra support for the glue joint. Pin the leading, trailing and center spar and locate the ribs. The center spar may be reinforced with a carbon strip, 3.0 mm × 0.5 mm, on the center panels. Use the lightest weight wood possible on the wing tips as it is important to keep the extremities as light as possible. Assemble the rest of the wing and glue with your favorite CA. After the wing is as-
sembled, double glue every contact point where two pieces of material meet. Use car- penters wood glue for this. Paint the entire wing structure with thinned-down (50-50) clear dope to add a little more rigidity to the structure. Silk or fiberglass cloth strips are glued to each dihedral break. Cover with your favorite covering. Hangar 9 Ultracote Lite is used on these models. Stabilizer: Use the same procedures as the wing. Use lightweight wood as it’s im- portant to keep the extremities light. Use a small 1⁄64-inch rectangular plywood pad on the underside of the trailing edge for the in- cidence screw to rest. The rudder: The rudder has three strips of basswood, .10 × .02 inch, glued to both sides for structural strength and resistance to warping tendencies.
Full-size plans available through Carstens Bookstore
www.carstensbookstore.com 42
MARCH 2014
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