Wing spars Part 6

From four spar caps, the front and rear spars were constructed. In the space between the upper and lower caps are the webs and pillars that connect the two.

The pillars in particular deserve closer attention: they serve to transfer loads, for example from the undercarriage, and may at first glance look like simple wooden blocks. In fact, they are made from cross-laminated spruce boards. The grain direction was also critical in the webs: it had to run vertically there, while the plywood coverings were laid at a 45-degree angle. And then there were the corner strips on the webs – 168 pieces in total.

To achieve the highest possible precision, a cross-line laser was used. This allowed all the work to be measured directly, ensuring a very high level of build accuracy.

Both spars are now ready to be closed on both sides with plywood.