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Peak 4 - 4m collapse

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Herman
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Re: Peak 4 - 4m collapse

Postby Herman » Thu Jul 27, 2023 10:55 am

High Smeagle, I think we may have been talking cross purposes depending on whether it is backstall or front stall etc. Either way with my small amount of Peak experience I think we might agree that it is hard to imagine a Peak anywhere near properly tuned front stalling because of the way it flys flapping drag sitting on the A, and yet the OP says the collapse occurs after sheeting out. Also generally, speaking we agree additional backstall in the sheeting range makes it easier to prevent luffing/front stall. Hopefully the op finds a small tangle pulling an element of A below the line of stall in the LE and the mixer in tune. I also think that I understand why you might prefer a little more camber, just not sure that it would solve the OP’s problem.

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Re: Peak 4 - 4m collapse

Postby Smeagle » Thu Jul 27, 2023 12:09 pm

Yeah...

Peak DOES behave very bad when sheeted out too far it's not "front stalling" but that does not really matter, it's not nice to handle. My measures (and IMO all kinds of bridle tuning) will not change that. BUT the point were it happens will be at a much larger depower setting and it will make more powered settings more useful ;) SO it will no longer happen in normal riding.

- Oliver

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Re: Peak 4 - 4m collapse

Postby ieism » Thu Jul 27, 2023 1:28 pm

Also check your B-safe1 and B-safe0 line lenght, or remove it for a session. I once had a Peak 4 where this line was much too short from the factory and it didn't fly well at all. This line should basically be under very little tension when the kite is flying, if too short it will kind of do what you describe.
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patrelsa
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Re: Peak 4 - 4m collapse

Postby patrelsa » Thu Jul 27, 2023 1:45 pm

A=Z but B and C were way off.Before adjusting B and C I shortened rear lines and kite obviously back stalled.The collapse would happen when I was riding powered up and when I would sheet out the kite would fold from the trailing edge and then wing tips would fold and kite would fall out of the sky unless I sheeted back in immediately.I will try the kite again after adjusting bridle.Thank you everyone for your help.

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Re: Peak 4 - 4m collapse

Postby Atte » Thu Nov 16, 2023 4:36 am

patrelsa wrote:
Thu Jul 27, 2023 1:45 pm
A=Z but B and C were way off.Before adjusting B and C I shortened rear lines and kite obviously back stalled.The collapse would happen when I was riding powered up and when I would sheet out the kite would fold from the trailing edge and then wing tips would fold and kite would fall out of the sky unless I sheeted back in immediately.I will try the kite again after adjusting bridle.Thank you everyone for your help.
Did you get it sorted out and what was the best settings in the mixer?

/Atte

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Re: Peak 4 - 4m collapse

Postby merl » Thu Nov 16, 2023 2:28 pm

Lots of people are commenting on the mixer settings. I'd be surprised if the underlying problem comes from the mixer. The peak is not at all sensitive to the mixer settings compared to most foils. I don't think an out of tune mixer will cause the peak to collapse. This problem sounds like something more fundamental. Maybe it can be improved a bit by fiddling with the mixer, but the real problem must be elsewhere.
Last edited by merl on Fri Nov 17, 2023 11:35 am, edited 1 time in total.
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Peter_Frank (Thu Nov 16, 2023 9:46 pm)
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Re: Peak 4 - 4m collapse

Postby Hardwater Kiter » Thu Nov 16, 2023 5:52 pm

Sounds almost like it's inverted and the Bsafe is inducing a frontal collapse. I've seen it with Peaks, seen it worse with other single skins.

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Re: Peak 4 - 4m collapse

Postby Peter_Frank » Thu Nov 16, 2023 9:58 pm

Look at the tips, are they clean and straight, or a little or big dent/nick in the middle where the b-safe connects?

If so, the b-safe is too short, easy to make it longer.

Or remove it to see if works as said, but not easy to test as I don't assume you would ever ride in that much wind on purpose.

8) Peter

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Re: Peak 4 - 4m collapse

Postby Johnnyrotten204 » Thu Nov 16, 2023 10:25 pm

We were talking about this on the last Peak page haha!

Summary: I'd seen it a couple times early on in my 'Peak career' but since I got a broader quiver, didn't find myself being overpowered enough and I forgot about it. The other day I saw it, and got curious about exploring the dynamic, since then I've been adjusting mixer, watching the luffing dynamic happen when overpowered/fully sheeted out (it causes one side to luff, lose lift and steer/pull towards the ground, not a front stall).

Mixer adjustment hasn't fixed it, checked the plastic 'battens', without making the dynamic go away. Suspect if you adjusted your stopper down half an inch it wouldn't happen. I'm chalking it up to being too overpowered, but good discussion!

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Re: Peak 4 - 4m collapse

Postby patrelsa » Fri Nov 17, 2023 2:19 am

Adjusting the bridle lines helped alot.....its still occurs somewhat when i totally let go of the bar.....i have too much throw in the depower line(should help even more to shorten it) and the canopy is pretty worked/stretched...but im much happier how it flies now compared to out of tune bridles



"I get the best performance using the following settings:
A = Z
B = +1.5cm
C = +1.0cm"


thanks all for the helpful hints


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