Differences between the Sig Wonder and a Lanier SHRIKE
SIG WONDER MODIFICATIONS
1) Replace ¼ x ¼ balsa L.E. stock with 3/16 x 3/16 spruce.
2) Do not trim 3" L.E. Sheeting to 2-3/4 per instructions the sheeting will go from the main spars over the top of the spruce L.E. in #1. Easier to do than the butt joint the plans call for
2A) Optional front wing bolt, add balsa block between center two ribs for 10-32 nylon screw to go into the added crossmember in the fuse.
2B) add tri stock to re-enforce F2 if wing dowels are to be used per plans.
3) Notch the 2 center ribs to accept ¼ x ¼ spruce stock for servo mounting rails these will be underneath the center section wing sheeting , giving the screws more wood to go through.
4) Add ½ triangle stock under wing mounting blocks. (when using a .25 engine)
5) Notch the trailing edge balsa stock where the torque rods will be before gluing into place, this saves carving time later at installation.
6) Omit servo access hatch on bottom of fuse, strengthen fuse aft of F4 with ¼ triangle stock. Read #7 for servo access.
7) Do not glue the Stab to the fuselage! Bolt the stab to the wing mounting blocks, 6-32 nylon screws, yes there is plenty of space. Add rear mount screw block to fuse for the stab 3/8 x ¼ hard wood will do and use a 6-32 nylon screw here too.
8) Before gluing doublers and formers to the fuselage sides, layout and cut ¼" x ¼" holes through fuse sides under stab for elevator & throttle servo mounting rails (spruce). I used HS-80 or HS -85 mirco servos by Hitec.
9) Add ¼ x ¼ triangle stock in fin/stab corner, fins tend to get knocked off.
10) Install fuel tank just in front of F3 to minimize pitch change as fuel is consumed. Print shows it up by the firewall.