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A330 Mrtt Wing  
User currently offline747400sp From United States of America, joined Aug 2003, 3718 posts, RR: 2
Posted (8 years 3 months 3 weeks 6 days 8 hours ago) and read 4581 times:

I been reading about the A330 MRTT or KC-30 (what ever you want to call it) having an A340 wing. I thought both the A330 and A340 had the same wing, so what make the A330 MRTT wing different from the A330 airliner?

10 replies: All unread, jump to last
 
User currently offlineRichardPrice From , joined Dec 1969, posts, RR:
Reply 1, posted (8 years 3 months 3 weeks 6 days 8 hours ago) and read 4580 times:

Basically, nothing. The A330 does share the wing with the A340, and thus has the hardpoints for the engines on the outer side, and this is one of the benefits touted of the MRTT programme - the wing already exists and doesnt need any strengthening to place refueling points out there.

User currently offline747400sp From United States of America, joined Aug 2003, 3718 posts, RR: 2
Reply 2, posted (8 years 3 months 3 weeks 6 days 8 hours ago) and read 4571 times:

There was a long range version of the A330 300 that was being looked at in 2000, it had the 12 wheel landing gear of the A340 and an extra fuel tank. This design should have been used on the A330 MRTT. With the A340 hard points on and the extra fuel tank and wheels, the A330 MRTT could have been a better tanker.

User currently offlineRichardPrice From , joined Dec 1969, posts, RR:
Reply 3, posted (8 years 3 months 3 weeks 6 days 6 hours ago) and read 4546 times:

Quoting 747400sp (Reply 2):
There was a long range version of the A330 300 that was being looked at in 2000, it had the 12 wheel landing gear of the A340 and an extra fuel tank. This design should have been used on the A330 MRTT. With the A340 hard points on and the extra fuel tank and wheels, the A330 MRTT could have been a better tanker.

The wingbox on the A330 is the same as that of the A340 as well - the centre gear position still exists and is blanked over, sometimes with an extra fueltank in there. I do believe its a line item option on A330 sales that noones ever required.

See how versitile the A330/A340 design is?


User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12171 posts, RR: 51
Reply 4, posted (8 years 3 months 3 weeks 5 days 15 hours ago) and read 4482 times:

Quoting RichardPrice (Reply 1):
Basically, nothing. The A330 does share the wing with the A340, and thus has the hardpoints for the engines on the outer side, and this is one of the benefits touted of the MRTT programme - the wing already exists and doesnt need any strengthening to place refueling points out there.

Then why did the RAAF specify the A-330MRTT be built with the A-340-300 wing? The RAF A-330TT will have the standard A-330-200/-300 wing.

The reason is the A-340 wing carries an extra spar the A-330 does not normally have. The A-340 wing also has additional plumbing and mounting points, for the outboard engines. The reason the A-330 wing does not (normally) have these additional parts is because those parts add additional weight that the A-330 does not need. The wing shape and cord on both airplanes are the same design.

But I agree the center wing section on the A-330-200/-300 and the A-340-200/-300 are the same.


User currently offlineTexfly101 From United States of America, joined Jan 2006, 351 posts, RR: 0
Reply 5, posted (8 years 3 months 3 weeks 5 days 8 hours ago) and read 4439 times:

Quoting KC135TopBoom (Reply 4):
Then why did the RAAF specify the A-330MRTT be built with the A-340-300 wing? The RAF A-330TT will have the standard A-330-200/-300 wing.

The reason is the A-340 wing carries an extra spar the A-330 does not normally have. The A-340 wing also has additional plumbing and mounting points, for the outboard engines. The reason the A-330 wing does not (normally) have these additional parts is because those parts add additional weight that the A-330 does not need. The wing shape and cord on both airplanes are the same design.

But I agree the center wing section on the A-330-200/-300 and the A-340-200/-300 are the same.

Great info, thanks


User currently offlineSaintsman From United Kingdom, joined Mar 2002, 2065 posts, RR: 2
Reply 6, posted (8 years 3 months 3 weeks 4 days 18 hours ago) and read 4395 times:

As KC135TopBoom has correctly stated, The wings are different internally because you do not need to carry un-necessary weight on the A330.

The Wing Pylons do not attach to outer engine hard points (although are fitted in the same position) and there is signifficant strengthening required at Ribs 25 - 26.


User currently offline747400sp From United States of America, joined Aug 2003, 3718 posts, RR: 2
Reply 7, posted (8 years 3 months 3 weeks 4 days 9 hours ago) and read 4347 times:

Think it would have been better if they put an A340-500-600 wing on it for more fuel, and kept the two A330 engines.

User currently offlineRichardPrice From , joined Dec 1969, posts, RR:
Reply 8, posted (8 years 3 months 3 weeks 4 days 7 hours ago) and read 4331 times:

Quoting KC135TopBoom (Reply 4):
The reason is the A-340 wing carries an extra spar the A-330 does not normally have.

What I meant was the wing doesnt require a redesign to hold the extra equipment as they are the same design across the A330/340 range (apart from the -500 and -600), obviously there will be missing internals as these would be extra wasted weight, but Im not sure why its referred to specifically as the 'A340' wing.

Quoting 747400sp (Reply 7):
Think it would have been better if they put an A340-500-600 wing on it for more fuel, and kept the two A330 engines.

The -500 and -600 wings are longer, and have a different centre wing box. Adapting the A330 would be akin to producing an A330-500, and probably not financiably viable.


User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12171 posts, RR: 51
Reply 9, posted (8 years 3 months 3 weeks 3 days 15 hours ago) and read 4284 times:

Quoting RichardPrice (Reply 8):
What I meant was the wing doesnt require a redesign to hold the extra equipment as they are the same design across the A330/340 range (apart from the -500 and -600), obviously there will be missing internals as these would be extra wasted weight, but Im not sure why its referred to specifically as the 'A340' wing.

Perhaps that is my fault. I should have said the "A-340-200/-300 wing".

Quoting RichardPrice (Reply 8):
Quoting 747400sp (Reply 7):
Think it would have been better if they put an A340-500-600 wing on it for more fuel, and kept the two A330 engines.

The -500 and -600 wings are longer, and have a different centre wing box. Adapting the A330 would be akin to producing an A330-500, and probably not financiably viable.

I believe the A-340-500/-600 wing is also a "supercritical" wing design, which is not good for the tanker mission, due to the turbalance it would create for the receiver aircraft. But, RichardPrice is correct, the -500 and -600 wing is totally different, structurally and aerodynamicly from the -200/-300 wing. Attaching the A-340-500 wing to the A-330 airframe would be a totally new airplane as the structural support would have to be different, in addition to the center wing box, as Richard pointed out.


User currently offlineAreopagus From United States of America, joined Sep 2001, 1372 posts, RR: 1
Reply 10, posted (8 years 3 months 3 weeks 3 days 3 hours ago) and read 4239 times:

Quoting KC135TopBoom (Reply 9):
RichardPrice is correct, the -500 and -600 wing is totally different, structurally and aerodynamicly from the -200/-300 wing.

Richard didn't say it is totally different: he said it had a different center wing box. Flug Revue says it has an enlarged and refined wing, which produces 40 per cent more lift. It has a tapered insert, an 1,6 m wing extensions providing 20 per cent greater surface area, and features a thermoplastic composite leading edge.


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