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Why not tail jets?

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Why not tail jets?

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Old 1st Aug 2012, 21:35
  #41 (permalink)  
 
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To move the topic a bit off subject: Given the structural and maintenance advantages of wing pylon mounted engines and their one principle disadvantage (longer landing gear) why don't we see more large high wing passenger aircraft?
From a fuel systems point of view, in the case of multiple pump failure, gravity feed uses up most of the fuel in the case of a low wing with dihedral and underslung engines, whereas a high wing with anhedral could leave a fair amount of unused fuel in the tips.

In addition, wingtip surge tanks are self draining on a wing with dihedral.

Last edited by Mechta; 1st Aug 2012 at 21:41.
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Old 2nd Aug 2012, 19:21
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If you don't buy the concept of spreading the mass laterally to reduce the wing root bending moment consider this ...

Tune in and watch an Olympic gymnast. I bet you could hold your entire body weight by hanging with both hands from one ring directly overhead but I bet you can't do a crucifix. Watch an Olympic champion doing a crucifix and consider the additional structure (muscle) he has in his shoulders to withstand the wing root bending moment!

Works the same way for an aeroplane!

Happy landings!

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