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Flysurfer Peak 4

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Peter_Frank
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Re: Flysurfer Peak 4

Postby Peter_Frank » Thu May 21, 2020 9:42 pm

a99 wrote:
Thu May 21, 2020 2:40 pm
Peter_Frank wrote:
Thu May 21, 2020 12:56 pm
The 8 an 11 are nothing special, because they lack the peak power the 5 and smaller got, so other kites will be able to go in the same, or lighter if a performance foil kite.
8) Peter
Difficult to understand this sentence, how bigger 8 anbd 11 peaks can have less power than 5m or 4 m peaks?? What do you mean there?

Of course the 8 and 11 got more peak power in absolute values.

But my point is, that the 3 and 4 and 5 m2 got loads of peak power, compared to the 8 and 11, if comparing to the power equivalent LEI's.

Especially because the small ones also deliver quite some peak power when flown "up", unlike their equivalent LEI's.

Relative values :thumb:

8) Peter

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Re: Flysurfer Peak 4

Postby ice » Fri May 22, 2020 12:36 am

Peter_Frank wrote:
Thu May 21, 2020 12:56 pm


My estimate on windranges for the average weights and a typical 1200 cm2 surf wing, or a medium 800 cm2 wing (as apparent wind makes the sweetspot quite similar), sweetspots are something like:

11 m2 in 4 to 4½ m/s (8-9 knots)
8 m2 in 5-6 m/s (10-11 knots)
5 m2 in 7-8 m/s (14-15 knots)
4 m2 in 9-10 m/s (18 knots)
3 m2 in 11-12 m/s or more (22 knots)



8) Peter
I have a only the 3m and the 5m

My findings at 90 kg, 1125 cm2 surf wing

5m 13 to 17 knots
3m 21 to 25 knots

So, quite similar to Peter. I definitely need a 4m to cover the gap, particularly given our seabreezes are often 17 to 21 knots.

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Re: Flysurfer Peak 4

Postby joriws » Fri May 22, 2020 8:01 am

Janus wrote:
Thu May 21, 2020 8:43 pm
Peert wrote:
Thu May 21, 2020 5:46 pm
Did someone ever try to put a couple of balloons in the LE as float.? I am convinced peak won't stop easily but if it does it would be nice if it stays afloat. Or even relaunch?
:idea: Test with helium filled balloons..
:lol: You cannot dive the kite for water start.. :roll:

A bit more seriously.

Water relaunch problem for Peak is not because fabric is sinking as fabric is less dense than water so fabric will float, Peak4 can be set on launch position on water and let drift out, just check Youtube.

Problem is that if on crash you lose line tension you will "carpet" the kite and wind cannot get underneath the kite to reverse it to sky (LE first crash). Traditional foil wisdom is that keep all 4 lines tensioned on crash for quicker/easier relaunch to not let foil to "carped" down, but don't sheet max power at time of crash, immediately after it. Closed cell foil can be lifted from carpet position quite easily but Peak cannot. And I doubt balloons at Peak4's LE "cavity" would help if you let kite to carpet but maybe I am wrong. Balloons at Peak4's "tip cell pockets" could make some fixed structure to lift kite up on back line tension, as there balloons would act like struts in LEI to help let wind get between kite and water surface.

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Re: Flysurfer Peak 4

Postby Peter_Frank » Fri May 22, 2020 9:04 am

ice wrote:
Fri May 22, 2020 12:36 am
Peter_Frank wrote:
Thu May 21, 2020 12:56 pm


My estimate on windranges for the average weights and a typical 1200 cm2 surf wing, or a medium 800 cm2 wing (as apparent wind makes the sweetspot quite similar), sweetspots are something like:

11 m2 in 4 to 4½ m/s (8-9 knots)
8 m2 in 5-6 m/s (10-11 knots)
5 m2 in 7-8 m/s (14-15 knots)
4 m2 in 9-10 m/s (18 knots)
3 m2 in 11-12 m/s or more (22 knots)



8) Peter
I have a only the 3m and the 5m

My findings at 90 kg, 1125 cm2 surf wing

5m 13 to 17 knots
3m 21 to 25 knots

So, quite similar to Peter. I definitely need a 4m to cover the gap, particularly given our seabreezes are often 17 to 21 knots.

True, and cool we are aligned, please note, you know of course, that my numbers are the CENTER of their sweetspots.

Meaning the 5 m2 I can use from 11 to 20 knots no issues, sweetspot maybe 13 to 16 knots., and the other sizes also has a sweetspot range of course.

But I wont note these ranges as I havent flown all of them sufficiently to know precisely - but their sweetspot centers you figure out quite fast after a couple of times out on each size :thumb:

8) Peter

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Re: Flysurfer Peak 4

Postby BigSky » Fri May 22, 2020 11:25 am

My friend has a Peak4 8m never used for sale ($650) and a very lightly used Peak4 5m ($500) for sale. Shipping from Boston Area. I'm still a huge fan of the Peak4 and have a full range. For me, at 175 lb, the 8m is great from 11 to 15 knots. While the 8m can work I use the 11m for lesser winds. Cheers.

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Re: Flysurfer Peak 4

Postby flying doctor » Fri May 22, 2020 11:59 am

Peter_Frank wrote:
Fri May 22, 2020 9:04 am
ice wrote:
Fri May 22, 2020 12:36 am
Peter_Frank wrote:
Thu May 21, 2020 12:56 pm


My estimate on windranges for the average weights and a typical 1200 cm2 surf wing, or a medium 800 cm2 wing (as apparent wind makes the sweetspot quite similar), sweetspots are something like:

11 m2 in 4 to 4½ m/s (8-9 knots)
8 m2 in 5-6 m/s (10-11 knots)
5 m2 in 7-8 m/s (14-15 knots)
4 m2 in 9-10 m/s (18 knots)
3 m2 in 11-12 m/s or more (22 knots)



8) Peter
I have a only the 3m and the 5m

My findings at 90 kg, 1125 cm2 surf wing

5m 13 to 17 knots
3m 21 to 25 knots

So, quite similar to Peter. I definitely need a 4m to cover the gap, particularly given our seabreezes are often 17 to 21 knots.

True, and cool we are aligned, please note, you know of course, that my numbers are the CENTER of their sweetspots.

Meaning the 5 m2 I can use from 11 to 20 knots no issues, sweetspot maybe 13 to 16 knots., and the other sizes also has a sweetspot range of course.

But I wont note these ranges as I havent flown all of them sufficiently to know precisely - but their sweetspot centers you figure out quite fast after a couple of times out on each size :thumb:

8) Peter
My (limited) experience on the 4 and 5 is the same as yours Peter.
I'm 74kg and use a spitfire with LW wings
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Re: Flysurfer Peak 4

Postby joriws » Fri May 22, 2020 6:08 pm

Talking about kiteloop-360, Florian Gruber did 720 with Sonic3, that is control and new benchmark.. Video on Flysurfer fb.

Still Peak is the question, can 360 be done with Peak's little inertia and worse l/d.

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Re: Flysurfer Peak 4

Postby Peter_Frank » Fri May 22, 2020 7:20 pm

joriws wrote:
Fri May 22, 2020 6:08 pm
Talking about kiteloop-360, Florian Gruber did 720 with Sonic3, that is control and new benchmark.. Video on Flysurfer fb.

Still Peak is the question, can 360 be done with Peak's little inertia and worse l/d.
Okay, there was the confusion, thought you talked about a normal donut, which is a kiteloop 360 (uploop).

But you are talking about an "all around the world 360" with kite up to windward, and usually a downloop I see now.

Can you do these? Or a rhetorical question?

I know they can be made with low AR tube kites also, the first was "the foiler" himself, Marc Blanc, I believe.

But maybe the inertia of heavier kites can be an advantage yes...

8) Peter

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Re: Flysurfer Peak 4

Postby joriws » Fri May 22, 2020 8:14 pm

Too many names, I usually call it dead man's turn like it was seemed to be called with kite buggy.

I can do it in winter, but I have not tried with Peak nor summer. Our beaches are narrow and forested so hard to find suitable place for trying sneakers on. Doing on fields is illegal on growing season too.

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Re: Flysurfer Peak 4

Postby Peter_Frank » Fri May 22, 2020 9:37 pm

Oh, you are not talking about dead man's turn on the water???


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