Give me strength....!
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Joined: Jan 2005
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From: Hotel this week, hotel next week, home whenever...
Give me strength....!
Other than structural strength, is there any other reason why on most GA and light twins the ailerons and flaps are corrugated?
Can't think of one... but maybe someone else knows different?
Can't think of one... but maybe someone else knows different?
Joined: Sep 2008
Aviation Qualifications: ATPL
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From: Scotland
I understand how the ridge type corrugations would help reduce spanwise flow but are the smooth indentation type as effective?
I imagine that spanwise flow is also less of an issue for light GA type wings than for high wing-loading swept aerofoils?
I imagine that spanwise flow is also less of an issue for light GA type wings than for high wing-loading swept aerofoils?
Joined: Jan 2008
Posts: 1,269
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From: Denver
Corrugations add chordwise stiffness/strength/rigidity (as already mentioned) at a lower cost than the alternatives: adding a separate structure of stringers or ribs, with rivets to attach a smooth skin; or bonded honeycomb materials.
Cost in both money (materials, assembly labor) and/or weight.
At some point, as aircraft get heavier/faster/more expensive overall - the minor savings of corrugated construction become insignificant compared to other costs in drag, maintenance, total strength. Which is why they are mostly used in small, relatively slow GA planes.
As a side note - SPANWISE corrugations are being explored as a means of controlling/inducing vortices over the wing for aerodynamic reasons (analogies: dimples on a golf ball; stitching on baseballs). I wouldn't expect to see them on your local Airbus/Boeing any time soon - but you just never know....
Cost in both money (materials, assembly labor) and/or weight.
At some point, as aircraft get heavier/faster/more expensive overall - the minor savings of corrugated construction become insignificant compared to other costs in drag, maintenance, total strength. Which is why they are mostly used in small, relatively slow GA planes.
As a side note - SPANWISE corrugations are being explored as a means of controlling/inducing vortices over the wing for aerodynamic reasons (analogies: dimples on a golf ball; stitching on baseballs). I wouldn't expect to see them on your local Airbus/Boeing any time soon - but you just never know....
Joined: Feb 2005
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From: flyover country USA
Light weight is an important piece of the equation. The outer wing panels of the Swift GC-1A/B light two-seat caught my attention many years ago; had my arms been long enough, I could have picked up the pair of them and run off. Only four ribs (located to carry the flap and aileron hinges), and corrugated skins - very impressive strength/weight design!
