- The artifact and the wing skin are 0.032" thick Alclad aluminum.
- The -3 brazier head rivets have 1" pitch and 0.060" underlying stringers.
- The stringer alignment matches the data published in TIGHAR TRACKS.
- The -5 brazier head rivets match the varying pitch of the tab and the rear spar** of the wing. The spacing between the rows of the -5 rivets matches the rear spar** of the wing.
- The artifact rows of -5 rivets do not match the lower frame of the Lockheed 10 window. The Lockheed 10 rivets were smaller and more closely spaced; see photo below. This indicates that the artifact did not come from Amelia's airplane.
- The s/n of the Sydney Island crash (13890, 1943 ) and the Bradley crash (15013, 1944 ) are reasonably close.
- The only surviving component from the crash on Sydney Island was the right wing, which broke off when it hit a tree, C-47A, s/n 13890, AAF# 43-30739.
- The Gilbertese settlers were known to travel to Sydney Island and salvage material from crashed aircraft.
- The chemical composition of the artifact matches World War Two aluminum, not 1930's aluminum; see table below.
The rivet may have to be removed to accurately determine its true characteristics. This should be done to a standard practice such as FAA Airframe Manual AC65-15, Chapter 5, page 167 to ensure that the rivet hole is not enlarged or damaged.
Brazier head rivets are obsolete so technical data is harder to find. The Aircraft Mechanics Handbook published by Chas. A. Bennett Inc. in 1944 contains a chart for Brazier head rivets. See chart below from Section 2, page 5, figure 6 of that manual.
Once the rivet is removed, check the hole size by inserting the appropriate drill. Reference Canadair Challenger Structural Repair Manual (1981), 51-42-11, page 6, figure 4, shown below.