Frame & Skin

1. Light weight materials: Aluminum (6061-T6) is the best choice due to:
   1. Its light weight and high strength-to-weight ratio.
   2. commonly used and commercially available metal.
   3. Easy machining.
   4. Weld ability.

Physical and Mechanical Properties ----Ultimate Tensile Strength, psi -----45,000
--------------------------------------------Yield Strength, psi ------------40,000
Chemistry --------------------------------Aluminum (Al) -----------------95.8 - 98.6%
--------------------------------------------Chromium (Cr)--------------- 0.04 - 0.35%
--------------------------------------------Copper (Cu)----------------- 0.15 - 0.40%
--------------------------------------------Iron (Fe) ---------------------0.70%
--------------------------------------------Magnesium (Mg) -------------0.8 - 1.2%
--------------------------------------------Manganese (Mn) -------------0.15% max
--------------------------------------------Silicon (Si) -------------------0.4 - 0.8%
Zinc (Zn)----------------------------------- 0.25%