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Why does a rectangular wing stall first at the root?
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Why does a rectangular wing stall first at the root? as opposed to tapering of the wing which causes the stall at the tip and moving inboard?
aerodynamics wing stall
edited 4 hours ago
ymb1
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up vote
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Why does a rectangular wing stall first at the root? as opposed to tapering of the wing which causes the stall at the tip and moving inboard?
aerodynamics wing stall
edited 4 hours ago
ymb1
60.1k5189318
asked 5 hours ago
TGW
312
New contributor
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
5
down vote
favorite
up vote
5
down vote
favorite
Why does a rectangular wing stall first at the root? as opposed to tapering of the wing which causes the stall at the tip and moving inboard?
aerodynamics wing stall
edited 4 hours ago
ymb1
60.1k5189318
asked 5 hours ago
TGW
312
New contributor
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Why does a rectangular wing stall first at the root? as opposed to tapering of the wing which causes the stall at the tip and moving inboard?
aerodynamics wing stall
aerodynamics wing stall
edited 4 hours ago
ymb1
60.1k5189318
asked 5 hours ago
TGW
312
New contributor
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 hours ago
ymb1
60.1k5189318
asked 5 hours ago
TGW
312
New contributor
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 hours ago
ymb1
60.1k5189318
edited 4 hours ago
ymb1
60.1k5189318
edited 4 hours ago
ymb1
60.1k5189318
60.1k5189318
asked 5 hours ago
TGW
312
New contributor
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 hours ago
TGW
312
asked 5 hours ago
TGW
312
312
New contributor
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
TGW is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
add a comment |Â
1 Answer
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votes
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The tip vortex (caused by higher pressure air from below the tip moving into the low pressure region on top by rolling around the tip) reduces the effective angle of attack at the tip and keeps the boundary layer attached longer as the stall progresses. The tip vortex has this effect with any wing shape, but shapes that reduce drag by shrinking the tip vortex will gain less from it, while a wing with less chord will tend to stall at lower AoA -- causing highly tapered wings to stall at the tip first.
I say "gain" because a tip stall is usually considered bad -- it can cause a spin entry, where a root stall with the tips still flying leads to a straight-ahead stall, other factors equal.
answered 4 hours ago
Zeiss Ikon
1,24310
I also think washout is related.
– ymb1
4 hours ago
@ymb1 Washout has the same effect and purpose -- and works on wings with substantial taper or sweep. A "plank" style wing, zero taper and zero sweep, doesn't really need it (or needs a good bit less).
– Zeiss Ikon
4 hours ago
A rectangular wing is a cheap way to get washout. Twisting the wing so that the tip has lower AoA is difficult to manufacture and costs more. A rectangular wing gets washout by using the vortex however there is the cost of more induced drag. If you want your plane to be spin resistant you need washout.
– DLH
1 hour ago
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
4
down vote
The tip vortex (caused by higher pressure air from below the tip moving into the low pressure region on top by rolling around the tip) reduces the effective angle of attack at the tip and keeps the boundary layer attached longer as the stall progresses. The tip vortex has this effect with any wing shape, but shapes that reduce drag by shrinking the tip vortex will gain less from it, while a wing with less chord will tend to stall at lower AoA -- causing highly tapered wings to stall at the tip first.
I say "gain" because a tip stall is usually considered bad -- it can cause a spin entry, where a root stall with the tips still flying leads to a straight-ahead stall, other factors equal.
answered 4 hours ago
Zeiss Ikon
1,24310
I also think washout is related.
– ymb1
4 hours ago
@ymb1 Washout has the same effect and purpose -- and works on wings with substantial taper or sweep. A "plank" style wing, zero taper and zero sweep, doesn't really need it (or needs a good bit less).
– Zeiss Ikon
4 hours ago
A rectangular wing is a cheap way to get washout. Twisting the wing so that the tip has lower AoA is difficult to manufacture and costs more. A rectangular wing gets washout by using the vortex however there is the cost of more induced drag. If you want your plane to be spin resistant you need washout.
– DLH
1 hour ago
add a comment |Â
up vote
4
down vote
The tip vortex (caused by higher pressure air from below the tip moving into the low pressure region on top by rolling around the tip) reduces the effective angle of attack at the tip and keeps the boundary layer attached longer as the stall progresses. The tip vortex has this effect with any wing shape, but shapes that reduce drag by shrinking the tip vortex will gain less from it, while a wing with less chord will tend to stall at lower AoA -- causing highly tapered wings to stall at the tip first.
I say "gain" because a tip stall is usually considered bad -- it can cause a spin entry, where a root stall with the tips still flying leads to a straight-ahead stall, other factors equal.
answered 4 hours ago
Zeiss Ikon
1,24310
I also think washout is related.
– ymb1
4 hours ago
@ymb1 Washout has the same effect and purpose -- and works on wings with substantial taper or sweep. A "plank" style wing, zero taper and zero sweep, doesn't really need it (or needs a good bit less).
– Zeiss Ikon
4 hours ago
A rectangular wing is a cheap way to get washout. Twisting the wing so that the tip has lower AoA is difficult to manufacture and costs more. A rectangular wing gets washout by using the vortex however there is the cost of more induced drag. If you want your plane to be spin resistant you need washout.
– DLH
1 hour ago
add a comment |Â
up vote
4
down vote
up vote
4
down vote
The tip vortex (caused by higher pressure air from below the tip moving into the low pressure region on top by rolling around the tip) reduces the effective angle of attack at the tip and keeps the boundary layer attached longer as the stall progresses. The tip vortex has this effect with any wing shape, but shapes that reduce drag by shrinking the tip vortex will gain less from it, while a wing with less chord will tend to stall at lower AoA -- causing highly tapered wings to stall at the tip first.
I say "gain" because a tip stall is usually considered bad -- it can cause a spin entry, where a root stall with the tips still flying leads to a straight-ahead stall, other factors equal.
answered 4 hours ago
Zeiss Ikon
1,24310
The tip vortex (caused by higher pressure air from below the tip moving into the low pressure region on top by rolling around the tip) reduces the effective angle of attack at the tip and keeps the boundary layer attached longer as the stall progresses. The tip vortex has this effect with any wing shape, but shapes that reduce drag by shrinking the tip vortex will gain less from it, while a wing with less chord will tend to stall at lower AoA -- causing highly tapered wings to stall at the tip first.
I say "gain" because a tip stall is usually considered bad -- it can cause a spin entry, where a root stall with the tips still flying leads to a straight-ahead stall, other factors equal.
answered 4 hours ago
Zeiss Ikon
1,24310
edited 4 hours ago
answered 4 hours ago
Zeiss Ikon
1,24310
answered 4 hours ago
Zeiss Ikon
1,24310
answered 4 hours ago
Zeiss Ikon
1,24310
1,24310
I also think washout is related.
– ymb1
4 hours ago
@ymb1 Washout has the same effect and purpose -- and works on wings with substantial taper or sweep. A "plank" style wing, zero taper and zero sweep, doesn't really need it (or needs a good bit less).
– Zeiss Ikon
4 hours ago
A rectangular wing is a cheap way to get washout. Twisting the wing so that the tip has lower AoA is difficult to manufacture and costs more. A rectangular wing gets washout by using the vortex however there is the cost of more induced drag. If you want your plane to be spin resistant you need washout.
– DLH
1 hour ago
add a comment |Â
I also think washout is related.
– ymb1
4 hours ago
@ymb1 Washout has the same effect and purpose -- and works on wings with substantial taper or sweep. A "plank" style wing, zero taper and zero sweep, doesn't really need it (or needs a good bit less).
– Zeiss Ikon
4 hours ago
A rectangular wing is a cheap way to get washout. Twisting the wing so that the tip has lower AoA is difficult to manufacture and costs more. A rectangular wing gets washout by using the vortex however there is the cost of more induced drag. If you want your plane to be spin resistant you need washout.
– DLH
1 hour ago
I also think washout is related.
– ymb1
4 hours ago
I also think washout is related.
– ymb1
4 hours ago
@ymb1 Washout has the same effect and purpose -- and works on wings with substantial taper or sweep. A "plank" style wing, zero taper and zero sweep, doesn't really need it (or needs a good bit less).
– Zeiss Ikon
4 hours ago
@ymb1 Washout has the same effect and purpose -- and works on wings with substantial taper or sweep. A "plank" style wing, zero taper and zero sweep, doesn't really need it (or needs a good bit less).
– Zeiss Ikon
4 hours ago
A rectangular wing is a cheap way to get washout. Twisting the wing so that the tip has lower AoA is difficult to manufacture and costs more. A rectangular wing gets washout by using the vortex however there is the cost of more induced drag. If you want your plane to be spin resistant you need washout.
– DLH
1 hour ago
A rectangular wing is a cheap way to get washout. Twisting the wing so that the tip has lower AoA is difficult to manufacture and costs more. A rectangular wing gets washout by using the vortex however there is the cost of more induced drag. If you want your plane to be spin resistant you need washout.
– DLH
1 hour ago
add a comment |Â
TGW is a new contributor. Be nice, and check out our Code of Conduct.
TGW is a new contributor. Be nice, and check out our Code of Conduct.
TGW is a new contributor. Be nice, and check out our Code of Conduct.
TGW is a new contributor. Be nice, and check out our Code of Conduct.
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