747400sp
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A330 Mrtt Wing

Sun Jul 30, 2006 1:54 am

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?
 
RichardPrice
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RE: A330 Mrtt Wing

Sun Jul 30, 2006 1:58 am

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.
 
747400sp
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RE: A330 Mrtt Wing

Sun Jul 30, 2006 2:12 am

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.
 
RichardPrice
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RE: A330 Mrtt Wing

Sun Jul 30, 2006 4:13 am

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?
 
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kc135topboom
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RE: A330 Mrtt Wing

Sun Jul 30, 2006 7:01 pm

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.
 
texfly101
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RE: A330 Mrtt Wing

Mon Jul 31, 2006 1:50 am

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
 
saintsman
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RE: A330 Mrtt Wing

Mon Jul 31, 2006 4:03 pm

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.
 
747400sp
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RE: A330 Mrtt Wing

Tue Aug 01, 2006 1:33 am

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.
 
RichardPrice
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RE: A330 Mrtt Wing

Tue Aug 01, 2006 3:12 am

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.
 
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kc135topboom
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RE: A330 Mrtt Wing

Tue Aug 01, 2006 6:59 pm

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.
 
Areopagus
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RE: A330 Mrtt Wing

Wed Aug 02, 2006 7:27 am

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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