|Quoting OPNLguy (Reply 3):|
I don't like the idea of fuel tanks above passengers,
|Quoting N328KF (Reply 2):|
the obvious problem of having flammable material above passengers
Photo © Tim Rees
Photo © The Fokker Aircraft Page
Fuel tanks within the fuselage contour must be able to resist rupture and to retain fuel, under the inertia forces prescribed for the emergency landing conditions in § 25.561. In addition, these tanks must be in a protected position so that exposure of the tanks to scraping action with the ground is unlikely.
|Quoting SlamClick (Reply 9):|
US Special Forces rejected the Shorts Skyvan in about 1968 in part because it had fuel cells above the cargo/passenger compartment. This was seen as undesirable for a combat aircraft. I think paying passengers may feel that they are entitled to at least as much safety as that given to green berets.
|Quoting Eatmybologna (Reply 7):|
I'm not an aerospace engineer either, so just a guess here. I believe that the weight of fuel is beneficial when located in the wings. The airplane's wings bare their highest loads of force during take off. This is due to the dynamic pressure of wind velocity against the bottom face of the wing during the initial ascend (take off.) The weight of fuel offsets the upward force on the wings, helps them remain more rigid, and helps keep them more horizontal. If you observe the wing over stretched intervals during a long cruise, you may see an increased upwards flex over time due to fuel consumption.
|Quoting Mohavewolfpup (Reply 14):|
or is it underneath the floor area?
|Quoting KELPkid (Reply 10):|
Interesting...there is at least one Shorts 330/360/Skyvan variant in active use with the Army Reserve...
|Quoting DALMD88 (Reply 11):
I think the biggest problem with a fuel tank above the passenger cabin is the structral mod work. An easier solution would be the tail like the MD-11. It would have an effect on CG, but I bet be workable.
|Quoting RJ111 (Reply 18):|
The 744 already has a 3,300 USG tail tank capacity and i assume the 748 will too.
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