Posted by Bhunt on June 13, 2015 at 10:09:38 from (162.255.123.64):
In Reply to: Nice jet posted by 1948CaseVAI on June 13, 2015 at 09:23:14:
1948CaseVAI said: (quoted from post at 17:23:14 06/13/15) The carbon fuselage is built here in Wichita and my daughter and son in law work at the Spirit plant where they make them. Tons of weight is saved as the structure of this plane is mostly carbon fiber, not metal.
Using carbon fiber allows Great Dane trailers to save 4,000 pounds per trailer for the new Walmart concept truck which is a product of Walmart, Peterbilt, Great Dane, and Capstone turbines. You can imagine the weight saved on this huge plane if they can shave 2 tons off a 53 foot trailer.
That will be interesting to see how it holds up over time composite fuselage combined with higher use of titanium structural components will certainly save weight along with that comes fuel savings But the real savings will be in the form of less down time particularly on C&D checks. Corrosion and fatigue is a number one enemy and cost millions to replace skins and structure. Who can forget Jan. 23, 1983,the Aloha Airlines Flight 243 737 that lost A major portion of the upper crown skin and structure of section 43 separated in flight causing an explosive decompression of the cabin. The damaged area extended from slightly aft of the main cabin entrance door, rear ward about 18 feet to the area just forward of the wings and from the left side of the cabin at the floor level to the right side window level. Conclusion of The investigation determined that weather had no role in this accident. The quality of inspection and maintenance programs were deficient. Also, the fuselage failure initiated in the lap joint along S-10L;( Stringer 10 Left) the failure mechanism was a result of multiple site fatigue cracking of the skin adjacent to rivet holes along the lap joint upper rivet row and tear strap disbonding which negated the fail-safe characteristics of the fuselage. Finally, the fatigue cracking initiated from the knife edge associated with the countersunk lap joint rivet holes; Skins to thin, the knife edge concentrated stresses that were transferred through the rivets because of lap joint disbonding. Its amazing they landed this aircraft. The pictures are astonishing.
This post was edited by Bhunt at 10:50:51 06/13/15.
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