Canopy material and Turbulence

[e.a.hernandez 0]

I was wondering if there is any significant
performance difference when flying
F-111, all ZP, or Hybrid (top ZP and bottom F-111) in tubulence? Wouldn't an F-111 be more prone to collapse than a hybrid or all ZP?

Blue Ones

[mchamp 1]

I know this doesn't have anything to do with material turbulence, but a side note is that airlocked canopies have somewhat of an advantage in turbulent winds

ok....done carry on

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[Calvin19 0]

Collapse resistance in ram air canopies is largely based on speed and angle of attack.

An f111 canopy is probably slow with a high angle of attack, making it less likely to collapse.

[JohnSherman 1]

There is no difference. The boundary layer is blown off the top of the wing the same in both cases.
Additionally, Air Lock canopies also fail the same way. If air locks worked then ridge wings wouldn't stall.

[e.a.hernandez 0]

Interesting. So, is there such a thing as the turbulent air flow hitting the canopy hard enough to collapse it (I mean depresurize it) and make it stall? Or is it that most stalls in turbulence are caused when the boundary layer gets blown off at the top of the wing (in which case then I guess material would not make much of a difference)?

[Hellis 0]

A microburst is turbulent air, and they knock airplanes down.
So yes, but during jumpable conditions i dont know, could happen.

Try fly behing a friends canopy and your canopy might shake quite alot.

I guess it all depends on when you consider it jumpable

[theonlyski 3]

Quote

Try fly behing a friends canopy and your canopy might shake quite alot.

There is video of a swooper following another guy's approach and ended up catching the turbulence, and the canopy collapsed. (IIRC it resulted in a cypres fire.)

"I may be a dirty pirate hooker...but I'm not about to go stand on the corner." iluvtofly
DPH -7, TDS 578, Muff 5153, SCR 14890
I'm an asshole, and I approve this message

[mchamp 1]

You mean this one?

http://www.youtube.com/watch?v=G_MsYQ3GtAg

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[theonlyski 3]

Quote

You mean this one?

http://www.youtube.com/watch?v=G_MsYQ3GtAg

Yup, that's it!

Moral of the story: If you're going to follow someone and TRY to get in their wake... do it well above your decision altitude.

"I may be a dirty pirate hooker...but I'm not about to go stand on the corner." iluvtofly
DPH -7, TDS 578, Muff 5153, SCR 14890
I'm an asshole, and I approve this message

[Hellis 0]

Quote

Quote

Try fly behing a friends canopy and your canopy might shake quite alot.

There is video of a swooper following another guy's approach and ended up catching the turbulence, and the canopy collapsed. (IIRC it resulted in a cypres fire.)

Thank you for saying thaf.
I just thought about i should have written try flying behind someone elses canopy at safe altitude.
I have had a few of those real shakers beeing behind other parachutes, its fun when you are used to them but scary in the begining.

Thanks for the video, never seen that one

[roq 0]

The design and the trim of the airfoil is the most important for colapse and turbulence resistence
So, the center pressure (CP) of the airfoil, the camber, inlets position and the trim is very important for colapse and turbulence resistence.
We know that when we want more airfoil performance (speed and flare power) we lost some safety
So, for HP canopys the CP is put more rear instead of the normal 25% of airfoil and the camber is more increased for more lift coef
It make the canopy more performant but less safe in turbulence.

roq