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Tip Stalls

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Old 02-16-2006 | 10:38 PM
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Default Tip Stalls

Had this posted on the Misnomer thread and got no response.

Why is it called a tip stall?

Does anyone actually believe that the wing dipped toward the earth because the tip stalled?

If the tip is holding the wing level then why bother with the rest of the wing?

Is the wing just something to keep the tips away from the fuselage?

Lastly, what was the wing doing while the tip was stalling, was it yelling at the tip to stop stalling or just sitting there in the breeze waiting for the inevitable to happen?
Old 02-16-2006 | 11:01 PM
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Default RE: Tip Stalls

Because that's what it is.
Yes.
It isn't.
Sometimes.
It waits.
Old 02-16-2006 | 11:21 PM
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Default RE: Tip Stalls

So if I remove the wing tips does the tip stall go with them? If I remove only one tip can I be sure that the other one will stall so that I can be ready for it.

If not, just how much of the wing feels compelled to behave like the tip?

Why do full scale flight manuals discuss stalls but not tip stalls, do they have better tips?
Old 02-17-2006 | 12:14 AM
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Default RE: Tip Stalls

Straight (constant chord) wings tend to stall at the root first, highly tapered wings tend to stall the wing tips first. Many full scale airplanes have "stall strips" on the leading edge of the wings at the root, these are there to make sure that the root stalls first. When the wing tip stalls, a snap roll is the result. If the wing root stalls first, the airplane usually just mushes and then drops it nose.
When a wing tip stalls, the loss of lift at the tip causes that wing to drop. The resulting roll changes the direction of the apparent wind causing the angle of attack of the dropping wing tip to increase even more, cinching the stall. This same roll reduces the angle of attack of the unstalled rising wing preventing it from stalling. Full up elevator gives the unstalled wing the angle of attack it needs to roll the plane very fast.
Ways to prevent tip stalls include making the leading edge of the wing sharp at the root, this encourages the stall to happen at the root first. Building the wing with washout, an intentional wing twist that has the wing tip flying with a lower angle of attack than the root. Washout has other advantages as well. It reduces drag by reducing the severity of wing tip vortices.
Old 02-17-2006 | 06:12 AM
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Default RE: Tip Stalls

Someone always has to get serious, don't they!
Old 02-17-2006 | 07:08 AM
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Default RE: Tip Stalls


ORIGINAL: Gremlin Castle

Had this posted on the Misnomer thread and got no response.

Why is it called a tip stall?
Would you preferwe call it "the farthest point of the wing from the center stopped flying and dropped towards the earth in a unexpected and violent maneuver that usually leads to vulgar language and questions of channels and glitches".

Does anyone actually believe that the wing dipped toward the earth because the tip stalled?
It dipped towards the earth bacause the earth was there. Perhaps it was really dipping towards Pluto and the Earth was just in the way.

If the tip is holding the wing level then why bother with the rest of the wing?
I tried to make a plane with only wing tips, I was real proud. I took it to the field when I went to set it up the tips kept falling on the ground.

Is the wing just something to keep the tips away from the fuselage?
No it also holds the tips off the ground (see above)

Lastly, what was the wing doing while the tip was stalling, was it yelling at the tip to stop stalling or just sitting there in the breeze waiting for the inevitable to happen?
I think it had something stuck between it's gear, and was trying to pick it out. Didn't even notice the tip stall until just prior to impact.

Old 02-17-2006 | 07:14 AM
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Default RE: Tip Stalls

sometimes it helps to put both ailerons "up" a bit to add "washout, and take it easy in the elevator at slow speeds..


JUST DON't CRASH
Old 02-17-2006 | 07:22 AM
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Default RE: Tip Stalls


ORIGINAL: Mode One

Someone always has to get serious, don't they!
Well....this is the aerodynamics forum.......and "tip stall" may well be a misnomer or a poor choice of words. Perhaps "asymmetrical stall" would be better.
Old 02-18-2006 | 11:12 AM
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Default RE: Tip Stalls

My planes do not respond to the words, " tip stall".

Only, faster and oh no.
Old 02-18-2006 | 11:19 AM
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Default RE: Tip Stalls

ORIGINAL: CHassan


ORIGINAL: Gremlin Castle

Had this posted on the Misnomer thread and got no response.

Why is it called a tip stall?
Would you preferwe call it "the farthest point of the wing from the center stopped flying and dropped towards the earth in a unexpected and violent maneuver that usually leads to vulgar language and questions of channels and glitches".

Does anyone actually believe that the wing dipped toward the earth because the tip stalled?
It dipped towards the earth bacause the earth was there. Perhaps it was really dipping towards Pluto and the Earth was just in the way.

If the tip is holding the wing level then why bother with the rest of the wing?
I tried to make a plane with only wing tips, I was real proud. I took it to the field when I went to set it up the tips kept falling on the ground.

Is the wing just something to keep the tips away from the fuselage?
No it also holds the tips off the ground (see above)

Lastly, what was the wing doing while the tip was stalling, was it yelling at the tip to stop stalling or just sitting there in the breeze waiting for the inevitable to happen?
I think it had something stuck between it's gear, and was trying to pick it out. Didn't even notice the tip stall until just prior to impact.

Absolutely the most brilliant post I've seen on this site...ever.

*applause*
Old 02-18-2006 | 02:00 PM
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Default RE: Tip Stalls

I have to agree. Thanks for not taking this seriously.

My next experiment is testing the compatibility of propwash mixed with hogwash.
ORIGINAL: gboulton

ORIGINAL: CHassan


ORIGINAL: Gremlin Castle

Had this posted on the Misnomer thread and got no response.

Why is it called a tip stall?
Would you preferwe call it "the farthest point of the wing from the center stopped flying and dropped towards the earth in a unexpected and violent maneuver that usually leads to vulgar language and questions of channels and glitches".

Does anyone actually believe that the wing dipped toward the earth because the tip stalled?
It dipped towards the earth bacause the earth was there. Perhaps it was really dipping towards Pluto and the Earth was just in the way.

If the tip is holding the wing level then why bother with the rest of the wing?
I tried to make a plane with only wing tips, I was real proud. I took it to the field when I went to set it up the tips kept falling on the ground.

Is the wing just something to keep the tips away from the fuselage?
No it also holds the tips off the ground (see above)

Lastly, what was the wing doing while the tip was stalling, was it yelling at the tip to stop stalling or just sitting there in the breeze waiting for the inevitable to happen?
I think it had something stuck between it's gear, and was trying to pick it out. Didn't even notice the tip stall until just prior to impact.

Absolutely the most brilliant post I've seen on this site...ever.

*applause*
Old 02-18-2006 | 02:06 PM
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Default RE: Tip Stalls

Propwash and hogwash cancel each other out.
Old 02-18-2006 | 02:20 PM
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Default RE: Tip Stalls

ORIGINAL: Jester

Propwash and hogwash cancel each other out.
Much like P-Factor and Poop-Factor.
Old 02-18-2006 | 02:39 PM
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Default RE: Tip Stalls


ORIGINAL: gboulton

Much like P-Factor and Poop-Factor.
Same thing
Old 02-18-2006 | 02:41 PM
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Default RE: Tip Stalls

But if you spill it on the floor it can cause a side slip.
ORIGINAL: Jester

Propwash and hogwash cancel each other out.
Old 02-18-2006 | 04:38 PM
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Default RE: Tip Stalls


I suppose you could call that adverse yaw.
Old 02-18-2006 | 06:10 PM
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Default RE: Tip Stalls

I guess that would depend on whether it caused yaw trouble or not.
ORIGINAL: Jester


I suppose you could call that adverse yaw.
Old 02-19-2006 | 04:30 PM
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From: BelvedereKent, UNITED KINGDOM
Default RE: Tip Stalls


ORIGINAL: CHassan


ORIGINAL: Gremlin Castle

Had this posted on the Misnomer thread and got no response.

Why is it called a tip stall?
Would you preferwe call it "the farthest point of the wing from the center stopped flying and dropped towards the earth in a unexpected and violent maneuver that usually leads to vulgar language and questions of channels and glitches".

Does anyone actually believe that the wing dipped toward the earth because the tip stalled?
It dipped towards the earth bacause the earth was there. Perhaps it was really dipping towards Pluto and the Earth was just in the way.

If the tip is holding the wing level then why bother with the rest of the wing?
I tried to make a plane with only wing tips, I was real proud. I took it to the field when I went to set it up the tips kept falling on the ground.

Is the wing just something to keep the tips away from the fuselage?
No it also holds the tips off the ground (see above)

Lastly, what was the wing doing while the tip was stalling, was it yelling at the tip to stop stalling or just sitting there in the breeze waiting for the inevitable to happen?
I think it had something stuck between it's gear, and was trying to pick it out. Didn't even notice the tip stall until just prior to impact.

Aren't wheels great?

No matter how badly you kill an aircraft, the wheels are always okay!

(With thanks to Andy Ross)

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