Forums: Skydiving Disciplines: Wing Suit Flying:
Vampire question

 

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granpasc

Aug 15, 2014, 2:07 PM
Post #26 of 33 (1597 views)
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Re: [hjumper33] Vampire question [In reply to] Can't Post

"Hole" in flysurfer kite called "jet flap":

http://www.racekites.com/...es/reviews/PS_02.jpg
http://kitesurfwindsurfmallorca.com/...-flaps-kite-blog.jpg

JET FLAP Technology (JFT).
Air is conducted from the bottom sail (pressure area) to the top sail (low-pressure area)
and is blown out with higher speed. The connection is established through jet shaped channels,
which are located in the rear section of the
wing. The additional escaping air mass on the
upper sail decelerates the air current displacement,
stall occurs later and more
When increasing the angle-of-attack, the danger of airflow stall will be minimized.
The result of the delayed stall is a higher power/m. Furthermore, the JET FLAPs decrease
luffing,
The effectiveness of the JET FLAP Technology has been proved during flight tests and numerous
studies.


Bluhdow  (B 37052)

Aug 15, 2014, 5:03 PM
Post #27 of 33 (1531 views)
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Re: [granpasc] Vampire question [In reply to] Can't Post

I'm not sure how this fits into the discussion, but I think it's also worth mentioning that the OSP (a BASE canopy) also has holes which allow air to bleed through the center of the wing. The purpose there is also stability, especially at low airspeeds.

Ironically enough, I'm told the Squirrel's new slider down prototypes utilize the same technology, or at least similar.


surfers98  (C License)

Aug 15, 2014, 11:38 PM
Post #28 of 33 (1450 views)
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Re: [hjumper33] Vampire question [In reply to] Can't Post

Charlie - I'm pretty sure the hole in the V4 & V5 is intended to make the legwing violently oscillate at high speed and during steep dives. It was reportedly a design mole, planted in Robi's head many years ago by Matt & Mike to induce us to defect to their products. It worked.


alygator

Aug 16, 2014, 7:28 AM
Post #29 of 33 (1350 views)
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Re: [surfers98] Vampire question [In reply to] Can't Post

For something which "doesn t work" just take a look at the last races like WWL, RBTG and PR and you ll see that Vampire are closely following Jedei/ Apache with a much smaller size. And take a look at the N4S video and let me know where you can see as sharp and quick turn in other brand video.
But if it don t work for you, just find something easier to handle...


(This post was edited by alygator on Aug 16, 2014, 7:37 AM)


surfers98  (C License)

Aug 18, 2014, 12:45 PM
Post #30 of 33 (932 views)
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Re: [alygator] Vampire question [In reply to] Can't Post

I never said it didn't work. I just said that some (not all) V4's and V5's have legwing oscillation/pressurization issues. The rest of my post was just poking fun at the brand wars.

I think Vampires are excellent and agile suits. In fact, I'm looking forward to taking a V-Race for a flight sometime.


ScottyBob  (D 1)

Aug 19, 2014, 6:35 AM
Post #31 of 33 (739 views)
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Re: [surfers98] Vampire question [In reply to] Can't Post

I once took a shit on a birdman blade...true story...


cs_troyk

Aug 19, 2014, 1:50 PM
Post #32 of 33 (618 views)
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Re: [ScottyBob] Vampire question [In reply to] Can't Post

ScottyBob wrote:
I once took a shit on a birdman blade...true story...

Uhhh.... video or it didn't happen? ...scratch that...


dpecnik

Aug 24, 2014, 1:01 PM
Post #33 of 33 (323 views)
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Re: [mccordia] Vampire question [In reply to] Can't Post

The "hole in the leg wing/deflector" functions the same way as the leading edge slot on the airplane wing. It provides smoother, cleaner airflow over leg wing in order to generate additional lift. Additional benefit is, as Jarno mentioned, cleaner and stronger airflow for pilot chute extraction and increased lateral stability. The result is very agile suit. Downside is that suits equipped with this slot are not that suitable for back flying.

More on slots can be found on number of aviation/aerodynamics pages, like: http://www.grc.nasa.gov/...2/airplane/flap.html

Wikipedia is helpful as always: http://en.wikipedia.org/wiki/Leading_edge_slot


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