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Hydrofoil front wing design

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kjorn
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Hydrofoil front wing design

Postby kjorn » Sun Jun 30, 2019 12:51 pm

Hi,

I'm going to try and 3D print something similar to the slingshot glide space skate, not sure what profile to use (I'm aiming for 2.5 degrees positive AoA - then shim to 3.5 if needed) any advice or thoughts? I want super fun, easy to carve, easy to learn new things on, get me through the gusts and lulls.

Space skate is 1,500cm area, I prob won't go that large, my current front wing is 600 sq cm, so maybe around 900 to 1,000 sq cm?
slingshot-space-skate--foil-wing.png
kjorn

grigorib
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Re: Hydrofoil front wing design

Postby grigorib » Sun Jun 30, 2019 2:23 pm

Few notes:
- For kitefoiling at 200lbs the 1000 sq.cm is probably as big as you need to cover both lightwind and regular freeride.
- 20mm profile thickness of 683s as opposed to 25mm of 633 allows to fly faster
- swept back, arrowhead leading edge shape will allow to avoid seaweed collecting on the wing
- higher AR gets you more stable setup - infinity 76 is about same area as H4 space skate but is a better wing

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kjorn
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Re: Hydrofoil front wing design

Postby kjorn » Mon Jul 01, 2019 12:10 am

grigorib wrote:
Sun Jun 30, 2019 2:23 pm
Few notes:
- For kitefoiling at 200lbs the 1000 sq.cm is probably as big as you need to cover both lightwind and regular freeride.
- 20mm profile thickness of 683s as opposed to 25mm of 633 allows to fly faster
- swept back, arrowhead leading edge shape will allow to avoid seaweed collecting on the wing
- higher AR gets you more stable setup - infinity 76 is about same area as H4 space skate but is a better wing
Very interesting. I didn't understand your profile comments, could you link to the profiles you mean, please :)

I'm struggling with my turns and switching my feet. Turning feels sluggish. And I'm so crap at switching my feet around. Do you think the gull-wing shape promotes a bit of agile-turning?

grigorib
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Posts: 2049
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 Radical6 138, Flysurfer Flydoor5 XL, Slingshot/Moses 80/91/105cm masts with 590/330 695/425 683s/450 wingsets, Tim's 36" "woody", Slingshot Micro 3'6", MBS Comp 95x

For sale: Slingshot SST 6m 2018 $480, Slingshot RPM 11m 2018 $600, Core XR4 10m $900, Core XR4 13.5m $980, Core XR4 17m $1075, Slingshot Turbine 5m 2017 like new $450, BROkite carbon board 140x44cm like new complete $650, Slingshot Rally 6m 2017 like new $530, 2019 Slingshot Guardian 17" brand new $260, 2018 Slingshot Guardian 20" bar $190
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Re: Hydrofoil front wing design

Postby grigorib » Mon Jul 01, 2019 12:47 am

kjorn wrote:
Mon Jul 01, 2019 12:10 am
grigorib wrote:
Sun Jun 30, 2019 2:23 pm
Few notes:
- For kitefoiling at 200lbs the 1000 sq.cm is probably as big as you need to cover both lightwind and regular freeride.
- 20mm profile thickness of 683s as opposed to 25mm of 633 allows to fly faster
- swept back, arrowhead leading edge shape will allow to avoid seaweed collecting on the wing
- higher AR gets you more stable setup - infinity 76 is about same area as H4 space skate but is a better wing
Very interesting. I didn't understand your profile comments, could you link to the profiles you mean, please :)

I'm struggling with my turns and switching my feet. Turning feels sluggish. And I'm so crap at switching my feet around. Do you think the gull-wing shape promotes a bit of agile-turning?
Basically I was saying the 20mm profile thickness is just enough for universal kitefoil wing with very decent lowend.

I think gull-wing shape doesn’t make much difference, and it’s rather more important wing features like area, profile thickness and AR. Maybe winglets have a bit of effect too.

As of turns - fly the kite, that’s the key.


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