Kitfox service advisory 25.

KITFOX SERVICE LETTER #25

March 12, 1993

SUBJECT:        Lift Strut Attachment

TO:                   Kitfox Owners, All Models

FROM:             SkyStar Aircraft Corporation

Recent experience with creation of the Kitfox XL manual has allowed us to rethink the way we answer two commonly asked questions:

1.  How do I make sure my dihedral is set correctly?

2.  What should I do if I find a need to force (lift with pressure) the forward or aft lift strut, to make them fit the spar mounted Lift Strut Brackets?

DIHEDRAL

The first question, regarding dihedral, is easy to answer through the use of a 4 ft. carpenter’s level. Your first step is to follow the existing directions by positioning the Lift Strut Bracket onto the spars, so that the center of the Strut Bracket bolt hole is 96.75 inches from the root end of the spar for Model IV and XL aircraft. For the Speedster, use an initial starting point of 97.75 inches from the root end of the spar. The Lift Strut Brackets should be temporarily held in place with hose clamps. Follow existing instructions for temporarily installing both wings, making sure you DO NOT drill the rear spar bottom hole, or either top or bottom front spar holes, until a final dihedral check is made.

The final dihedral check is made only after making sure the fuselage is leveled both laterally and longitudinally. Once the fuselage is leveled, with the wings, struts and Lift Strut Brackets temporarily assembled, simply hold your 4 ft. carpenter’s level up to the bottom of the leading edge spar at a mid span location. Because of the dihedral, the bubble will not be centered if the level is held firmly against the spar. Simply lower the “wing tip” end of the level until the bubble is centered. The following distance should exist between the “wing tip” end of the level and the spar: