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Are The KC-390 Wings Large Enough?  
User currently offline747400sp From United States of America, joined Aug 2003, 3671 posts, RR: 2
Posted (3 years 5 months 5 days 20 hours ago) and read 5195 times:

Seeing that the KC-390 is supposed to replace old and compete with new C-130s, I wounder, are the KC-390 wing large enough to do the job that a C-130 could? A C-130 wing has a span of around 132 ft, where a KC-390 wing span, is around 118 ft, that a big difference.

10 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17068 posts, RR: 66
Reply 1, posted (3 years 5 months 5 days 20 hours ago) and read 5169 times:

The C-130 was designed in the early fifties and first flew 57 years ago. In the intervening time, aerodynamics have come a very long way. So I'm sure the wing will do.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineSchorschNG From Germany, joined Sep 2010, 500 posts, RR: 0
Reply 2, posted (3 years 5 months 5 days 19 hours ago) and read 5128 times:

The KC-390 will sacrifice a bit of field performance when fully loaded.
The C130 is weak in power, a general problem for props.
The KC-390 will solve small wing area with thrust, a strategy Embraer also embraced for the E-Series.

But correct: the KC-390 is a bit off the usual specifications of a military transport. I guess that Embraer realized that only a very small number of operators use their transports into truly short fields with max payload.



From a structural standpoint, passengers are the worst possible payload. [Michael Chun-Yung Niu]
User currently offlineSAAFNAV From South Africa, joined Mar 2010, 281 posts, RR: 1
Reply 3, posted (3 years 5 months 5 days 17 hours ago) and read 5075 times:

Quoting SchorschNG (Reply 2):

The C130 is weak in power, a general problem for props.

Not quite



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User currently offlineKingairTA From United States of America, joined Feb 2009, 458 posts, RR: 0
Reply 4, posted (3 years 5 months 5 days 13 hours ago) and read 4983 times:

Is the original question in regards to wing area or enough spacing to fuel two aircraft at one time like on the C-130?

User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 5, posted (3 years 5 months 5 days 12 hours ago) and read 4964 times:

Quoting SchorschNG (Reply 2):
The C130 is weak in power, a general problem for props.


I take it you have never flown in an L-188 Electra


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17068 posts, RR: 66
Reply 6, posted (3 years 5 months 5 days 12 hours ago) and read 4960 times:

Quoting SchorschNG (Reply 2):
The C130 is weak in power, a general problem for props.

Not true at all. What makes you say that?



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineWingscrubber From UK - England, joined Sep 2001, 852 posts, RR: 0
Reply 7, posted (3 years 5 months 3 days 8 hours ago) and read 4565 times:

Quoting Starlionblue (Reply 6):
Quoting SchorschNG (Reply 2):
The C130 is weak in power, a general problem for props.

Not true at all. What makes you say that?

Maybe it's more appropriate to say that the C-130 is just not optimized for the higher sub-sonic speeds like the KC-390, power is not in short supply on a C-130, but the MMO is.

As a reference, google tells me a C-130 has wing loading of 88lb/sq ft, but a 737 classic(similar size to KC-390??) has wing loading of 101lb/sq ft.
Faster airplanes can get away with higher wing loading, thus smaller wings. The trade off will be that C-130 will still kick KC-390's ass when it comes to STOL, but it'll be left behind on longer routes.

[Edited 2011-05-22 21:49:36]


Resident TechOps Troll
User currently offlineSpacepope From Vatican City, joined Dec 1999, 2952 posts, RR: 1
Reply 8, posted (3 years 5 months 2 days 12 hours ago) and read 4342 times:

Quoting Wingscrubber (Reply 7):
Faster airplanes can get away with higher wing loading, thus smaller wings. The trade off will be that C-130 will still kick KC-390's ass when it comes to STOL, but it'll be left behind on longer routes.

Maybe, maybe not. One of the thing the C-130 sorely lacks are high lift devices on the wings. It has simple flaps and no slats. If the KC-390 incorporates slats and, say, slotted flaps (with drooping ailerons) a LOT of the STOL advantage of the C-130 will get eaten up.

One could argue the wing of the C-130 IS the high-lift device, but with its (relatively) fixed shape, it's also the reason for its slow cruise speed.



The last of the famous international playboys
User currently offlineSAAFNAV From South Africa, joined Mar 2010, 281 posts, RR: 1
Reply 9, posted (3 years 5 months 1 day 23 hours ago) and read 4231 times:

Quoting Spacepope (Reply 8):

One could argue the wing of the C-130 IS the high-lift device, but with its (relatively) fixed shape, it's also the reason for its slow cruise speed.

The C-130 is quite fitted out for short field relative to its size.. And is 300KTAS not sufficient for what it was designed to do?

It's a Tactical Airlifter, not Strategic, so a 450Kts GS is not what is needed. That you use a C-5 or equivalent.

Erich



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User currently offlineViscount724 From Switzerland, joined Oct 2006, 25637 posts, RR: 22
Reply 10, posted (3 years 5 months 1 day 4 hours ago) and read 4121 times:

Quoting 474218 (Reply 5):
Quoting SchorschNG (Reply 2):
The C130 is weak in power, a general problem for props.


I take it you have never flown in an L-188 Electra

Or Convair 580, or Saab 2000.


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