Advertisement
For the top Rib Caps soak the ends of the wood strips in hot water as before and once pliable pre-form
the top curve carefully with fingers then glue in place with Yellow glue. See the pictures above. Once all
the Ribs with Caps in place are set; with a sharp hobby knife blade using the laser reference lines cut
away the web of plywood to the Caps being very careful not to cut through the Caps themselves.
Magnification would be very helpful in doing this. These are the locations for the Spars front and rear
on each Rib. Once each web is cut away test fit the opening with the appropriate Spar. Once all are
Ribs are trimmed, index them onto the two Spars together and lightly sand to match if necessary. Also
test fit the Wing Tip to the extensions on the front and rear Spars. See the pictures above.
Leading Edge Stiffeners: Now add caps to the twelve (12) Leading Edge Stiffeners (5a) with ample
overhang at the front edge and cut the trailing edge flush with the end of the Stiffeners. See the picture
on the next page. Also add caps, top and bottom to WR1a at this time.
Now position each Rib roughly in their proper position on the plans along with the other parts to make
sure all are accounted for and ready to assemble. Using T-pins index and align the two (2) Spars in
place on the plans by first inserting a T-pin on the fuselage end of the Spars and then work down the
length of each Spar positioning the T-pins to hold each in place firmly to the building board. Insert
several T-pins across the top to press the Spars down against the building board. Now adjust each Rib
into its final position on the building pattern and glue in place with a drop of CA medium viscosity at
each joint and allow the CA to set. NOTE: WR2 is not a full rib but is a support rib for the Step
Platform WR7. Use WR7 to space WR2 from the last Rib WR1. Allow time for the CA to set firmly then
39
Advertisement
