The initial concept for the Vertical Tail (VT) surface was based upon the conventional tail design option for the stock aircraft. Since I need to be LSA compliant my aircraft requires a bit more wing area (an unreasonable 110 square feet) and that drives the vertical tail to be somewhat larger. After crunching the numbers a somewhat larger tail design was worked out along with a ventral fin to allow for more fixed surface area. That ventral fin also provides for the tail bumper and a tie down point. In addition to the larger vertical tail size, the aft fuselage was also stretched 24" to provide more moment arm. The vertical tail uses the full stretch to increase moment arm while the horizontal tail uses only part of it. The difference in aft displacement allows for an elevator without cutouts for rudder deflection and leaves less rudder blanking in a spiral dive situation.
1) This shows the construction details along with appearance. location and sizing of Vertical Stabilizer and Rudder along with their component parts.
2) This shows the construction details for the forward and aft spars for the Vertical Stabilizer.
3) The design for the mold that will form the Vertical Tail is based on using a wooden frame to support a sheet of Formica type counter top laminate. The concept should be rigid enough to allow for vacuum bagging without distortion. If needed additional wooden reinforcement will be added to the underside of the mold form. Two molds will be made, one for the right side (shown) and one for the left side (mirror image). The right side mold will be used to form that sides’ skin along with putting all of the fillers, ribs and spars in place. The connections between the VS aft spar and the Rudder spar can be made during construction and after it has all been removed from the molds, the built in cut lines will be followed to separate the two parts. With a little bit of finishing the VT will be ready for mounting. This construction technique is simpler than what the Vision plans call for and should