On (22 Nov 97) Charles Mielke wrote to Karl Schneider...
KS> CM>     I read, somewhere, that ALL aircraft will pull 2 Gs in
KS> CM> a 60 degree bank, regardless of speed, if level flight was
KS> Exactly.  It's simple physics!
 CM>     Seems logical. Do you happen to know the formula
 CM>     for this?
 I believe so .  Lemme see if I can do this without diagrams...
 In level flight, L=W (lift = weight).  We can call these both '1'.
 In a bank, the lift vector
 is displaced from the vertical by the amount of bank [theta], so then the
 *vertical component* still has to be equal to the weight.  The
 cosine of 60 degrees is 0.5, so the lift is then weight/cos theta
 or 2.  (Lift is twice the weight).  An interesting extrapolation is
 to consider a 90 degree bank angle where cos theta is zero and the
 lift is 'infinite'.  Which probably causes a fair amount of discomfort
 to wings and passengers. ;>
... If a mirror reverses left and right, why not up and down?
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