				C I T A B R I A

Comments to the plan

These comments were written as hints, not as complete building instructions. They are to show some 
soultions I found while building my version of the Citiabria, and are not neccessarily the perfect.
The plane is very easy to build but sometimes youīll have to think a little, due to, for example the 
Depron source problem. Nevertheless you may write me every question you have.

The material of the complete Plane is 3mm Depron. It has relativela thick fuse diameters, so Roofmate, 
Styrofoam, Styrodur or something like this may also work, if itīs hot wire cut down to 1/8".
The sides of the fuselage and its upper- and lower sides can also be made of thinner material to 
save some weight. On the other hand, itīs the old story - this will make the plane a little more fragile.
All carbon rods have a diameter of 1.5mm (~1/16").

- print the plan and resize it, so that the square on it has the correct measures printed to it.

- xerox the plan a few times, so you can cut it directly to gain the stencils for the fuselage, the
  control surfaces and the wingtips.

- Cut two complete fuselage sides and two versions that reach until the dotted diagonal line. This 
  will be the inner reinforcements. Glue the reinforcements to the fuse sides. Be sure to make a left 
  and a right part.

- The widh of the frames will be like you want it to, 5 cm (2") is a good value.

- The nose block will be cut from styrofoam, EPP or any other foam you have handy. The motor will be 
  in a through that is filed to the block. It will be fixed in position by a rubber band that is 
  stretched over a carbon dowel that is pierced through the block.

- At the bach, the two side parts will be glued together. Rudder and elevator surfaces are kept together 
  by a small piece of the rudder that fits into a slot in the elevator surface. Glue this unit directly 
  onto the fuse end.

- At the parts of the fuse that are marked with small circles, carbon rodes are glued to the fues, that 
  they are about 5mm (1/5") over the fuse.

- Glue some depron on the upper and lower side of the fuse. Cut away the material theīs looking over the 
  sides.

- The motor sheeting consists of ordinary paper, that is held of the motor dowel.

- The wing are two parts of Depron, 40 x 17 cm (8" x 6 3/4"). Cut the wingtips using the stencils. Then do 
  the Klaustrophobic profile trick : just bend the first third of it over an table edge. This will form the
  Profile. If it has about 10% camber, it is ok.

- Fix a 25 cm (10") long carbon rod with clear adhesive tape to the leading and trailing edge of the wing halfs.

- The wings will be fixed to the fuse with 2,5 mm silicon hose with 1mm inner diameter. Put one of this at each
  end of the carbon rod. Tey will be needed to keep the wings struts.

- The struts form a V. The lower paert of the V is made of a piece of drilled PVC - hose. Secure it with a drop 
  of CA to keep it at the first lower carbon rod at the fuse, because it will cause ugly flight patterns, of this 
  thing gets loose during flight.

- The landing gear consists of carbon rods, each connection is made of PVC hose. The citabria - typic bended spar
  between the wheels consists of 0.8 mm (1/32") piano wire. The "suspension" is made of a siple rubber band. The 
  wheel hubs can be made of plastic tube normally used for steering connections.

Further Information at :  http://www.unisport.tu-bs.de/~modellflug/klaustrophobia/klaust.htm
eMail 		       :  pa.wegener@tu-bs.de
