Q1 Plans Chapter 8 Page 8-1
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- Category: Quickie Plans
- Published: Tuesday, 07 October 2008 01:00
- Written by Dan Yager
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BUILDING THE VERTICAL FIN AND RUDDER
The rudder is constructed exactly like the aileron was so review that section on the “Basic Aileron Construction” before proceeding.
Begin by making CS21, which is a 26" long piece of l/2" O.D. x .035" wall 2024T3 Aluminum tubing. Also make CS22 which is a 1" length of 7/16" x .063" steel tube. Find the two CS23 phenolic bearings, and the CSA10 rudder horn assembly.
The hot wired rudder foam core will have to be cut to a 26" length. Save the excess as this will become part of the upper vertical fin. Now, layup one BID over the rudder just like you did with the ailerons.
Begin building the vertical fin by laying up one BID in the rudder slot at 45 deg to, and parrallel to, the trailing edge. After that layup has cured, sand off one of the tails so that the top flows smoothly into the rudder slot. Shape the vertical fin tip to a pleasing shape.
Next, install the Vertical Fin Reinforcement by removing the blue foam where necessary and using micro. The red foam will have to be sanded to obtain the same airfoil shaped contour. Sand the rudder slot into it also.
Now layup one BID over the vertical fin, in the same manner as the ailerons. A second piece can be used for the tip area.
Next on the agenda is installing the rudder. The centerline of the lower pivot is located 1.5” along the rudder slot from the base of the vertical fin. Dry fit a CS23 at that location, and then, using the rudder, locate the other CS23 at the top. The rudder should have about .06” freeplay.
Before mounting the CS23 bearings permanently, you will have to verify proper gap between the rudder and the vertical fin. Insert CSA10 into the bottom end of CS21, and CS22 into the top end of CS21, with the CS23 bearings in place on CS21. After verifying that the rudder horn part of CSA10 is perpindicular to the chord of the rudder, go ahead and drill it in place. Also drill in and rivet CS22 in place.
Review the section of the plans on installing the ailerons, and then mount the two CS23’s permanently with micro, checking the gap between the rudder and the vertical fin. After the micro has cured, layup one BID over the CS23 bearings on each side to permanently attach them to the vertical fin.
To complete the vertical fin, take the excess rudder foam core, make up a foam piece that will fill the gap between the core and the vertical fin, and use micro to construct the top part of the vertical fin. Layup one BID oier the foam to join it to the already glassed vertical fin.
