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Thoughts on a size adjustable foil wing....
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thombiz



Joined: 25 Jun 2007
Posts: 742
Location: Corpus Christi

PostPosted: Sat Jul 20, 2019 7:49 pm    Post subject: Thoughts on a size adjustable foil wing.... Reply with quote

We had family in for a visit two weeks ago and one of the toys the 4 year old brought to play with inspired some thoughts in me about foiling. The kid's toy was a metal jet fighter with wings that could be in numerous positions. It occurred to me that this concept could be used to make a front foil wing that could be adjusted to fit rider size. See the pics.


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dllee



Joined: 03 Jul 2009
Posts: 4594
Location: East Bay

PostPosted: Sat Jul 20, 2019 8:22 pm    Post subject: Reply with quote

Wouldn't surface area be the same?
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isobars



Joined: 12 Dec 1999
Posts: 19268

PostPosted: Sat Jul 20, 2019 8:56 pm    Post subject: Reply with quote

Yeah, but that MoFo would be faster'n hell.
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thombiz



Joined: 25 Jun 2007
Posts: 742
Location: Corpus Christi

PostPosted: Sat Jul 20, 2019 10:04 pm    Post subject: Reply with quote

It occurred to me, instead of the wing tips swinging, they could just telescope. That would simplify adjustment.
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dllee



Joined: 03 Jul 2009
Posts: 4594
Location: East Bay

PostPosted: Sat Jul 20, 2019 10:10 pm    Post subject: Reply with quote

There ya go, locking position, watersealed when extended, weight in control, stage adjustments, no insurmountable problems at all.
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grantmac017



Joined: 04 Aug 2016
Posts: 830

PostPosted: Sun Jul 21, 2019 4:06 pm    Post subject: Reply with quote

Last I checked the speed of sound in water is about 100 faster than any foil will reach. So a swept outline isn't going to gain anything.

If you want to have fun look up the 6 digit NACA profiles developed for low drag and stable center of lift. Specifically the ones used on the AC45 foiling cats. Then take a close look at the Slingshot Infinity wings.
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fathomfathom



Joined: 25 Jul 2005
Posts: 47

PostPosted: Mon Jul 22, 2019 9:31 pm    Post subject: Reply with quote

grantmac017 wrote:

If you want to have fun look up the 6 digit NACA profiles developed for low drag and stable center of lift. Specifically the ones used on the AC45 foiling cats. Then take a close look at the Slingshot Infinity wings.


Do you have a link to the theory /review of the NACA profile for those AC45?
I did a google but nothing of interest
Thanks
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grantmac017



Joined: 04 Aug 2016
Posts: 830

PostPosted: Tue Jul 23, 2019 4:12 pm    Post subject: Reply with quote

I can't seem to find the article, perhaps it was pulled?

Basically certain foil profiles have a fairly wide range of speeds before hitting a major drag wall and they can also offer a stable center of lift.
The early slingshot designs are very biased towards lift at the expense of drag and increased pitching moment. The later designs emphasize a stable center of lift and low drag. Because the drag is low they can use a larger wing which then increases lift at the bottom end.

If that makes any sense?
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dllee



Joined: 03 Jul 2009
Posts: 4594
Location: East Bay

PostPosted: Wed Jul 24, 2019 1:38 pm    Post subject: Reply with quote

So WE are paying for the R&D so the companies reap the profits.
Pretty normal.
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fathomfathom



Joined: 25 Jul 2005
Posts: 47

PostPosted: Wed Jul 24, 2019 2:31 pm    Post subject: Reply with quote

dllee wrote:
So WE are paying for the R&D so the companies reap the profits.
Pretty normal.


Thats' rather negative
I think it's a win win.
Earlier adopters get to try new stuff and give feedback, the manufacturers take the cost of building new gear.

or if you prefer cheap, wait another 10-15yrs for mass production until us early adopters finish changing the products.
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