Companion wing rear spar cap strips

[danoban]

Are the Companion rear spar cap strips 2024-T3, or 6061-T6 like the other Bearhawks? On the rear spar page it has 2024 for material in the information block, and I don’t see anything else indicated for the rear cap strips.

[SpruceForest]

Bob is an old-school, draft-with-pencil/ink the final drawing sort of guy, so the material callout covers everything on the drawing not already called out on an earlier plans sheet unless otherwise annotated , such as the 6061-T6 spacers and MS rivet callouts. This is why there is no materials notation for the Rear Spar End (aka aft spar wing mount bracket) despite the 6061-T6 material used (which was called out for that component on Plans Sheet 7). FWIW, the Patrol and Companion wings are pretty much identical, and Patrol aft spar plans sheet calls out 2024-T3 for the caps, spar material, spar doubler.

In terms of perspective, traditional drawings were done in pencil on vellum or mylar, and inking for publication took time. Mistakes in inking vellum often resulted in a redo, so unlike CAD, every element of duplicative info in a drawing package came at a cost. When I went through my undergrad engineering stuff, we had to do pencil and inked drawings as freshmen; by the time I finished, the entering students were doing at least some stuff in CAD. Out in industry, it helped to have done both, as new stuff was on computer, while we had warehouses full of paper from legacy stuff.

Similar situation going from slide rule to electronic calculator... order of magnitude and significant digits sort of took care of themselves for slide rule users as part of correct use, while those that grew up with calculators were prone to OOM errors/slow with OOM swags and tracking significant digits.

From the viewpoint of folks coming from the Vans ecosystem, the Bearhawk plans package is archaic, but all the info is there if you understand the underlying practices assumed by Bob.

[danoban]

Thanx much.