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All the Phantom 4 series have this while the P3 was all plastic inside.[QUOTE="sandman259, post: 1162378, member: 57021.
Could be an alloy containing both magnesium and titanium. Very likely contains aluminum too.Titanium alloy vs Magnesium..???
There are no commercial alloys of Magnesium and Titanium although both alloy with Aluminum. The P4A chassis is almost certainly Grade 5 Titanium with 6% Aluminum and 4% Vanadium. It is as strong as high alloy steel with about half the weight. The P4 Magnesium chassis could be any one of dozens of alloys all of which will have much more bulk and a little more weight than a similar strength Titanium structure so the P4A would have more room for operational hardware.Could be an alloy containing both magnesium and titanium. Very likely contains aluminum too.