ah Viking9 ... a little knowledge is a dangerous thing.
You are right about the 1-11 but wrong about the rest. After all if the fuel is 'trapped' then you can't use it at the other end can you? Perhaps you area bit confused with a 'short release' (and the subsequent reclaiming of reserve fuel).
'Trapped' fuel is exactly that .. trapped to ensure c of g trim at zfw (not take off weight). This was a particular difficulty of the 1-11 (especially the -300) ... when operating empty .. i.e. (to those in the know) without a 'payload'.
So .. nul points my friend. Back to the ramp for you.
