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Surf/wave wing thickness and NACA profiles

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plummet
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Re: Surf/wave wing thickness and NACA profiles

Postby plummet » Sun Dec 29, 2019 9:21 am

Chur Bro!

I shall proceed with the wing build!

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Re: Surf/wave wing thickness and NACA profiles

Postby tomtom » Sun Dec 29, 2019 10:26 am

How much different is this wing to 590 copy you have?
I will go thinner and bigger.

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Re: Surf/wave wing thickness and NACA profiles

Postby plummet » Sun Dec 29, 2019 7:29 pm

tomtom wrote:
Sun Dec 29, 2019 10:26 am
How much different is this wing to 590 copy you have?
I will go thinner and bigger.
Current wing is 550x135mm
580cm²
Aspect ratio of 4.

So i've dropped the aspect ratio back to 3.75, increased the surface area 220cm², and kept a relatively thin Eppler profile.

I've gone larger surface area and lower aspect as a trail to see how much stability I'll gain V how much top end I'll lose.

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Re: Surf/wave wing thickness and NACA profiles

Postby tomtom » Sun Dec 29, 2019 8:23 pm

Coming from much bigger wing /onda 633/ it seem small to me but i was in wrong impression that your wing original is about 800 cm2. I understand you want incremental changes from what you have now.
Do your T mastfuse still hold strong? Do you mind share production details? Wish you good luck with!

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Peter_Frank
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Re: Surf/wave wing thickness and NACA profiles

Postby Peter_Frank » Sun Dec 29, 2019 8:48 pm

You have increased aspect ratio to 4.8 thats why I called it medium AR.

AR is span divided with mean chord.

Or simply span*span/area.

Thus 62*62/800 = 4.8

This gives you more lift than a low AR wing and less drag, but turns (initiate turns) slower.

I think it is a good compromise as you want to go fast also.

My 790 cm2 wave wing has an AR of 4.2 which is just fine.

No need to go too low AR unless you are up in huge wings over 1000 cm2, as the medium ones turn just fine, and better to have some more range which higher AR delivers :thumb:

8) Peter
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Re: Surf/wave wing thickness and NACA profiles

Postby bohme » Sun Dec 29, 2019 9:19 pm

Why e387?
The e387 has a lot of camber and a very high sweet spot Cl around 0.7 (around 10kn of foil speed)
My guess is it get unstable above 18kn (Cl below 0.4).
A NACA 4 series might be a better choice.
Attachments
e387.png

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Re: Surf/wave wing thickness and NACA profiles

Postby Peter_Frank » Sun Dec 29, 2019 9:50 pm

Eppler 387 has loads of lift indeed, so you could be right a tad less mean camber could be better, if he want to go fast yes.

But for riding slow on a wave, and having a lively foil (small wing), it should work just dandy I would think :D

8) Peter

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Re: Surf/wave wing thickness and NACA profiles

Postby plummet » Mon Dec 30, 2019 12:30 am

bohme wrote:
Sun Dec 29, 2019 9:19 pm
Why e387?
The e387 has a lot of camber and a very high sweet spot Cl around 0.7 (around 10kn of foil speed)
My guess is it get unstable above 18kn (Cl below 0.4).
A NACA 4 series might be a better choice.
I used 387 as it was a recommendation on another site. I'm open to change however.

Hmmm, think 18 knots max will be a bit too slow. What do you recommend for 14 knots average 24 knots max?

PS I can't find 1409,2409,3409 on the tools website. I can find 1408,2408.

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Re: Surf/wave wing thickness and NACA profiles

Postby Europ2 » Mon Dec 30, 2019 12:53 am

plummet wrote:
Mon Dec 30, 2019 12:30 am
I can't find 1409,2409,3409 on the tools website. I can find 1408,2408.
Why don't you make your own NACA 4 or5 digits ? :)
https://apps.autodesk.com/FUSION/de/Det ... n&os=Win64

NACA 6 digits also possible with Github scripts....

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Re: Surf/wave wing thickness and NACA profiles

Postby plummet » Mon Dec 30, 2019 1:41 am

Europ2 wrote:
Mon Dec 30, 2019 12:53 am
plummet wrote:
Mon Dec 30, 2019 12:30 am
I can't find 1409,2409,3409 on the tools website. I can find 1408,2408.
Why don't you make your own NACA 4 or5 digits ? :)
https://apps.autodesk.com/FUSION/de/Det ... n&os=Win64

NACA 6 digits also possible with Github scripts....
Down loaded. I'll have a play.


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