Simplified Wing Stress Analysis (10Mb PDF)
I Beam Analysis Good article on built up spars vs. solid wood spars. (2.5Mb PDF)
Strength of Metal Aircraft Elements (8.2mb PDF)
ANC-18 Design of Wood Aircraft Structures. It is split into 3 parts for easy download. I think this might be the first edition, for what it's worth my second edition is dated June 1951.
I don't have the complete ANC-19 in PDF but here are some information from ANC-19 concerning "Requirements for Wood in Specific Parts".
ANC-19 pg 118-126 (9.5mb)
Three PDF documents that can be used to determine the size and location of the large registration numbers on wings.
NACA report #344 regarding spar web design (PDF 1.2mb)
Build you own sand blaster By Chris Bobka
Summerill tubing data
ANC-5 Strength of Aircraft Elements 1940, this is a copy of ANC-5. It is the later revised October 1940 edition. As it is so scarce and is a companion of sorts to the Summerill tubing data pdf above. Thanks to Chris Bobka
Possible reference to the old designation BHP used on his darwings for the Air Camper and Sky Scout's cabane struts (thanks Santiago Morete)
Plans for the galvanized fuel tank, drawn by Larry Williams
More to come later..
Email me if you have any construction tips you want to share.