Higher elongation allows higher _
Made possible by a closer vertical stabilizer shell
b/a =0.5 -> 0.2
Increased elongation has weak impact on bN, but strong impact on b
b = bN(IP/aBT)
= bN/q* _ 2.5 _ (1+k2)
Ballooning stable _ and _N
= 0.7
qedge = 3.5
A = 4
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