Contact   Imprint   Advertising   Guidelines

Aerodynamically better leading edge

Forum for kitesurfers
grigorib
Very Frequent Poster
Posts: 1617
Joined: Mon Aug 01, 2016 8:12 pm
Kiting since: 2009
Local Beach: OBX; Clinton Lake, IL; Lake Michigan; Tawas, MI; SPI; La Ventana
Gear: Kites: Slingshot Rally 5/7/9/11m, Slingshot Turbine 9m, Flysurfer Speed4 10m standard, Peter Lynn Venom II ARC 16m
Boards: Spleene RIP 37, Flysurfer Flydoor5 XL, Slingshot/Moses 80/91/105cm masts 590/683s/633 wings, Tim's 36" "woody", Slingshot Dwarfcraft 42", MBS Comp 95x

For sale: Stringy's 743 custom surf fuselage for 633/683S/790/873
Brand Affiliation: None
Has thanked: 40 times
Been thanked: 76 times

Aerodynamically better leading edge

Postby grigorib » Sat Jan 14, 2017 11:00 pm

Did anyone ever built a two-chamber, two-bladder, oval-shaped leading edge so it has less drag and is more aerodynamic?
I meant an internal rib in the middle throughout the LE and bladder in each chamber. It will be thin but will weigh a lot and probably won't deliver rigidity of a fat LE.

What if we go for cuben fiber and have a high pressure LE bladder?? That way all current kites will become obsolete already!! Won't it be the best solution??!!

User avatar
lovethepirk
Very Frequent Poster
Posts: 563
Joined: Sun May 10, 2015 7:04 am
Kiting since: 2015
Style: Almost air tacking on hydrofoil...
Gear: Delta Race Hydrofoil, 15m SS Turbine, 12m Switchblade, 9m Switchblade
Brand Affiliation: None
Location: Naples, FL
Has thanked: 0
Been thanked: 1 time

Re: Aerodynamically better leading edge

Postby lovethepirk » Sat Jan 14, 2017 11:17 pm

Can't comment on your ideas...but I've always wondered about a swimming noodle stuffed inside the leading edge with tapered ends :o :o :o

PullStrings
Very Frequent Poster
Posts: 1432
Joined: Sat Nov 26, 2011 7:54 pm
Kiting since: 1999
Gear: LEI's & Surfboards
Has thanked: 39 times
Been thanked: 34 times

Re: Aerodynamically better leading edge

Postby PullStrings » Sat Jan 14, 2017 11:28 pm

Image

User avatar
lovethepirk
Very Frequent Poster
Posts: 563
Joined: Sun May 10, 2015 7:04 am
Kiting since: 2015
Style: Almost air tacking on hydrofoil...
Gear: Delta Race Hydrofoil, 15m SS Turbine, 12m Switchblade, 9m Switchblade
Brand Affiliation: None
Location: Naples, FL
Has thanked: 0
Been thanked: 1 time

Re: Aerodynamically better leading edge

Postby lovethepirk » Sat Jan 14, 2017 11:49 pm

Come on PullStrings why you gotta cut my legs off like that? :) Imagine a curved, hollow, formed noodle :o easily slipped into the LE. It would work, but I haven't worked the math on the weight :)

User avatar
Peter_Frank
Very Frequent Poster
Posts: 9214
Joined: Wed Oct 16, 2002 1:00 am
Kiting since: 0
Brand Affiliation: None
Location: Denmark
Has thanked: 81 times
Been thanked: 89 times

Re: Aerodynamically better leading edge

Postby Peter_Frank » Sun Jan 15, 2017 12:06 am

Yes, North did in in 2002 or 3 as far as I I remember, an oval two chambered front tube :D
But left it again.

I can not see many advantages, as if you decrease the diameter ever so slight, the double tube added stiffness with two tubes will quickly be "lost".

Meaning, stiffness is proportional to diameter cubed, so if you have the double stifness from two tubes, you can only decrease the diameter about 20% instead of 50%, so the gain is small compared to all the other disadvantages :roll:
But hats off that they tried it :hut:

8) Peter

iriejohn
Very Frequent Poster
Posts: 1550
Joined: Fri Dec 18, 2015 11:04 pm
Kiting since: 0
Local Beach: 50.7752° N, 0.9077° W
Style: None
Gear: This 'n that
Brand Affiliation: None
Location: Noviomagus Reginorum
Has thanked: 50 times
Been thanked: 38 times

Re: Aerodynamically better leading edge

Postby iriejohn » Sun Jan 15, 2017 12:20 am

The LE diameter could be left the same to maintain rigidity but the LE front and trailing edges could be profiled into more aerodynamic shapes to reduce drag. Don't know how though, maybe internal ribs in the LE bladders?

grigorib
Very Frequent Poster
Posts: 1617
Joined: Mon Aug 01, 2016 8:12 pm
Kiting since: 2009
Local Beach: OBX; Clinton Lake, IL; Lake Michigan; Tawas, MI; SPI; La Ventana
Gear: Kites: Slingshot Rally 5/7/9/11m, Slingshot Turbine 9m, Flysurfer Speed4 10m standard, Peter Lynn Venom II ARC 16m
Boards: Spleene RIP 37, Flysurfer Flydoor5 XL, Slingshot/Moses 80/91/105cm masts 590/683s/633 wings, Tim's 36" "woody", Slingshot Dwarfcraft 42", MBS Comp 95x

For sale: Stringy's 743 custom surf fuselage for 633/683S/790/873
Brand Affiliation: None
Has thanked: 40 times
Been thanked: 76 times

Re: Aerodynamically better leading edge

Postby grigorib » Sun Jan 15, 2017 12:25 am

iriejohn wrote:The LE diameter could be left the same to maintain rigidity but the LE front and trailing edges could be profiled into more aerodynamic shapes to reduce drag. Don't know how though, maybe internal ribs in the LE bladders?
Let's say the front remains as is but if there's a second layer of ripstop from LE to main sail making it a drop-shape?

Doesn't need to be too wide, let's say 1.5x diameter of LE wide

iriejohn
Very Frequent Poster
Posts: 1550
Joined: Fri Dec 18, 2015 11:04 pm
Kiting since: 0
Local Beach: 50.7752° N, 0.9077° W
Style: None
Gear: This 'n that
Brand Affiliation: None
Location: Noviomagus Reginorum
Has thanked: 50 times
Been thanked: 38 times

Re: Aerodynamically better leading edge

Postby iriejohn » Sun Jan 15, 2017 1:00 am

grigorib wrote:
iriejohn wrote:The LE diameter could be left the same to maintain rigidity but the LE front and trailing edges could be profiled into more aerodynamic shapes to reduce drag. Don't know how though, maybe internal ribs in the LE bladders?
Let's say the front remains as is but if there's a second layer of ripstop from LE to main sail making it a drop-shape?

Doesn't need to be too wide, let's say 1.5x diameter of LE wide
As long as it doesn't fill up with water when you crash.

grigorib
Very Frequent Poster
Posts: 1617
Joined: Mon Aug 01, 2016 8:12 pm
Kiting since: 2009
Local Beach: OBX; Clinton Lake, IL; Lake Michigan; Tawas, MI; SPI; La Ventana
Gear: Kites: Slingshot Rally 5/7/9/11m, Slingshot Turbine 9m, Flysurfer Speed4 10m standard, Peter Lynn Venom II ARC 16m
Boards: Spleene RIP 37, Flysurfer Flydoor5 XL, Slingshot/Moses 80/91/105cm masts 590/683s/633 wings, Tim's 36" "woody", Slingshot Dwarfcraft 42", MBS Comp 95x

For sale: Stringy's 743 custom surf fuselage for 633/683S/790/873
Brand Affiliation: None
Has thanked: 40 times
Been thanked: 76 times

Re: Aerodynamically better leading edge

Postby grigorib » Sun Jan 15, 2017 1:09 am

iriejohn wrote:
grigorib wrote:
iriejohn wrote:The LE diameter could be left the same to maintain rigidity but the LE front and trailing edges could be profiled into more aerodynamic shapes to reduce drag. Don't know how though, maybe internal ribs in the LE bladders?
Let's say the front remains as is but if there's a second layer of ripstop from LE to main sail making it a drop-shape?

Doesn't need to be too wide, let's say 1.5x diameter of LE wide
As long as it doesn't fill up with water when you crash.
It doesn't have to cover all length of the LE. It might be enough to have it span (and it can be stretchy material, not necessarily ripstop) between struts leaving couple of inches of gap on each side. Or maybe only have it on the eartips which don't produce less pull but plenty drag.

Did anyone tried this?

User avatar
Puetz
Very Frequent Poster
Posts: 981
Joined: Sun Jul 06, 2003 12:50 pm
Kiting since: 2003
Local Beach: Casuarina Beach
Rapic Creek
Lee Point
Buffallo Creek
Favorite Beaches: Old Woman Rock, Darwin
Oka Point, Sanuar, Bali
Phan Rang, Vietnam
Cemetary's, Mui Ne, Vietnam
Point Moore, Hells Gates, Geraldton, Western Australia
Rapid Creek, Darwin, Australia
Lee Point, Darwin, Australia (my local spot)
Nugas/Lakey Peak, Sumbawa
Marion Bay, Tasmania
Long Beach, Robe, South Australia
Style: Wave/Freeride
Gear: North Juice 2018 17m
North Evo 2017 14m
Duotone Neo 9m
North Rebel 2014 7m
North Nugget 5'3" Surfboard
Cyclone Surfboard 6'0"
North SkyPro 138cm TT
Underground FLX 144 TT
Brand Affiliation: None
Location: Darwin, Northern Territory, Australia
Has thanked: 1 time
Been thanked: 0

Re: Aerodynamically better leading edge

Postby Puetz » Sun Jan 15, 2017 1:15 am

Peter_Frank wrote:Yes, North did in in 2002 or 3 as far as I I remember, an oval two chambered front tube :D
But left it again.

I can not see many advantages, as if you decrease the diameter ever so slight, the double tube added stiffness with two tubes will quickly be "lost".

Meaning, stiffness is proportional to diameter cubed, so if you have the double stifness from two tubes, you can only decrease the diameter about 20% instead of 50%, so the gain is small compared to all the other disadvantages :roll:
But hats off that they tried it :hut:

8) Peter
... nah it was Gaastra that made the double chamber LE, not North,,,, Gaastra Phoenix.


Return to “Kitesurfing”

Who is online

Users browsing this forum: Bing [Bot], knotwindy, ladomi, TommyDuotone and 7 guests

cron