RE: 1/5 Pepsi Chipmunk - Build
Today, I got a chance to more or less finish the left wing and start framing the right one.
As mentioned above, I purchased the optional two piece wing kit.
Each wing half is built around two hardwood spars joined by a 1/8" spar web. This is quite a strong design and the spar web and ribs are slotted for an interlocking mechanism.
The wing joiner is a piece of 3/8" plywood that slides into the pocket between the spars. It is epoxied in place in the left wing and the spar web in the root rib bay is then doubled with another layer of 1/8" aircraft grade plywood, epoxied onto the spar web. A pair of 4mm bolts then screws through the doubled spar web and into a blind nut on the back of the joiner piece.
Access to the bolts is given by leaving the root rib bay in the right wing unsheeted over the bolts.
I suspect this will work quite well and be strong, as the joiner fits snugly between the spars and is pulled tight up against the doubled spar web by the bolts.
I will try to post some photos tomorrow.
Ari