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

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edited 4 hours ago

ymb1

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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

share|improve this question

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 | 

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

share|improve this question

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

share|improve this question

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.

share|improve this question

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.

share|improve this question

share|improve this question

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 | 

add a comment | 

1 Answer
1

active

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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.

share|improve this answer

edited 4 hours ago

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 | 

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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.

share|improve this answer

edited 4 hours ago

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 | 

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.

share|improve this answer

edited 4 hours ago

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 | 

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.

share|improve this answer

edited 4 hours ago

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.

share|improve this answer

edited 4 hours ago

answered 4 hours ago

Zeiss Ikon

1,24310

share|improve this answer

share|improve this answer

edited 4 hours ago

edited 4 hours ago

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 | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  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 | 

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