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Post by Medic1nz on Aug 12, 2012 18:17:12 GMT 12
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Post by beagle on Aug 12, 2012 20:45:10 GMT 12
Yeah I saw 71 come in to CHC Sat morning/lunchtime
must have been a few mourners, VIP's etc turn out
Saw a landrover and ceremony gun on the back of a semi this morning going north through Hornby at 5.30
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Post by Dave Homewood on Aug 13, 2012 13:13:12 GMT 12
Great shots!
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Post by flyjoe180 on Aug 13, 2012 20:09:23 GMT 12
Marvellous pics, this is a rare event indeed. Well caught.
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Post by ox on Aug 18, 2012 11:38:01 GMT 12
I thought at least one of them had winglets?
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Post by beagle on Aug 18, 2012 18:42:48 GMT 12
There was some speculation a few years ago that they might look into that.
There was a USAF C32 visiting the country which they got to talk to the aircrew etc regards the benefits, bla bla bla.
But now all we say is "there's a recession on ya know"
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Post by flyjoe180 on Aug 22, 2012 10:18:33 GMT 12
Recession, all the more reason to save fuel by adding winglets I would have thought?
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Post by Dave Homewood on Aug 22, 2012 10:58:59 GMT 12
Have you seen how much they cost? The RNZAF could buy another helicopter for the price of two sets of winglets.
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Post by vs on Aug 22, 2012 12:48:18 GMT 12
757 in my opinion is the only airplane that looks better without them
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Post by Deleted on Aug 22, 2012 16:36:35 GMT 12
It's between $1-2 million for the blended winglets, so I read. But you get 370km of range or 4,870kg extra payload for a 757-200 with winglets, apparently.
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Post by beagle on Aug 22, 2012 18:33:27 GMT 12
I think it would cost much more than that to get them fitted etc
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Post by beagle on Aug 22, 2012 18:43:19 GMT 12
The winglet installation on a 757 is structurally very invasive. We are not talking about a minor wing tip fastened structure. The structure travels inboard and distributes the load paths almost back to the engine pylons. There is structural ballast involved and incorporated internally as well. The lower wing plank is cut and a entire new lower wing plank assembly (section) is installed and it has machined stringers as an integral part of the assembly. There is also some mighty beefy frames that join the old and new wing plank sections. A 'cut' wing plank pretty much guarantees that the wing will never be the same again.
The wing itself is extended about 2 extra feet before the winglet (composite structure) is even considered or added to this dimension. This is not an easy "de-mod". I hear this term used frequently but it is not easily understood. If you damage or get a lightening strike on a winglet on a B737, I understand that an adapter ring can be installed that will allow the original wing tips to be installed and the asset can be returned to service in what is called a "De-mod" configuration while the winglet can be repaired. The B757 has no such capability to my knowledge. A temporary de-mod should not be confused with an attempt to engineer a removal of the winglet and all winglet installation structure. Any time you take a cargo conversion which basically stiffens the fuselage and attempt to prove compatibility with another significant alteration such as a winglet, you open up all sorts of issues that involve a tremendous amount of data and analysis requirements. Wing loads and Flutter issues would need a full review as well as a wing center box study come to mind. Far more than a Ground vibration test will be required. I do not think that the solution will necessarily include a complete removal of winglets and structure. If you have to leave several hundred pounds of structure in the wing then why go down that road? For a cargo operator, reducing empty weight and eliminating winglets that serve no purpose on short sectors while eliminating composite damage repair costs are probably the only valid reason to do a complete removal. Further, if you are forced to leave any winglet related structure in the wing then this alteration will have potentially affected the wing stiffness or loads characteristics which throws us right back into deep analysis requiring OEM data. We are talking about the OEM's "crown jewels" which is "wing load data" and nobody gets access to that unless you develop it yourself from scratch. First on the check list would be wind tunnel pressure model which would run you about $1.2m at last check.
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