Hi Toad
Not too sure on the tubing, I can try and find out from the BBMF. The aluminium was used mostly for joints, or what they call the fairing formers (large teardrop frames). Those are the large vertical sections that keep all the various tubes/wires etc together. I didn't realise at just how many different materials was actually used - just showed they used whatever they could get their hands on. So, judging by the diagram, it looks like aluminium alloy was used for the large structural frames. Probably the chrome/molly steel for the main tubing. Small strips of aluminium for the small lower fuselage vertical support beams or rather strips. Wood for the top fairing formers in conjuction with alloy. And finally steel wire that runs horizontally down the rear fuselage that most likely keeps the canvas down. Steel (guessets) was used to join most of the tubes together and fix them onto the joists/frames. Alloy gussets were used on the smaller alloy structures.
The actual composition of the types of metal is another thing and something I don't know.
Cyas up!
'Nexx'
