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Low Aspect rear wing/stab

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atomic-chomik
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Low Aspect rear wing/stab

Postby atomic-chomik » Sat Dec 23, 2017 2:18 am

Looking for some commentary on the viability of using a low aspect rear wing. Ive got a hand made medium aspect wing that i made but the tips kinda went wrong so i chopped it and thinking of using it as a low aspect rear wing. The second Front wing i made is good to go.
What I've noticed is that most rear wings seem to be higher aspect. Any insight appreciated.

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Peter_Frank
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Re: Low Aspect rear wing/stab

Postby Peter_Frank » Sat Dec 23, 2017 10:32 am

This is one of the best questions I have seen on this forum, and not "easy" to answer IMO, and have had many thoughts about this very thing.

I'll give it a try though.

A higher AR wing has a bit more overall lift, a lot less drag when at higher AOA's, and it will have a steeper lift/AOA curve at high positive and negative lift which should give more stability when you push it hard in tight turns, but on the other hand a low AR can be pushed even harder without stalling the rear wing.

BUT, in reality, I think they are just high AR because you CAN, there are no downsides because it is so much smaller than the front wing, and it looks good too :thumb:
And better wake turbulence immunity.

I got a supersmall really low AR rear wing (I call it a stabilizer though, as it is not used as a lifting "wing"), and it works just fine.

Very lively and agile - but because I dont have a high AR one so small, but got two bigger ones, high AR, I can not compare as they ride very differently anyways, when different size.

I have had a really low AR small one too on my very first foil years ago, to complement a (back then) new really small/fast frontwing.
And I felt that it could give an odd "burp" now and then, quite rare :roll:
But on the other hand, it could also be my lack of experience back then, or that these wings were not cut/sanded perfect - so hard to say...

OR, if too low AR it has less span, and might be influenced more by turbulence or even air bubbles from the front wing or mast - thus this occassional burp ?
Whereas high AR stabilizers will not be as prone to this of course.
So my take is, that because there are no downsides of high AR stabilizers, one will choose this to ensure you dont have wake turbulence issues.

If you ask me, I woud guess the AR of the rear wing does not matter much really, apart from the risk that turbulence could affect more.

If an issue or not will depend on your very hydrofoil of course, maybe not a problem, maybe it will.

Above is all feelings and theory based on experiences and knowledge - but I can not say for sure :wink:

Just go try it out :naughty:

PS: Is it your first hydrofoil you are going to learn on, or got experience ? If you dont, have some experienced ride it - you dont just go out and ride such a thing and you need to know if it is hopeless to learn on, or if it works great, or something in between :rollgrin:

8) PF

atomic-chomik
Medium Poster
Posts: 158
Joined: Sat Jul 05, 2014 10:33 pm
Kiting since: 4
Local Beach: The wild west
Style: Freeride/Surf
Gear: North Dice 8 and 10m
North Neo 12m
OR Prodigy 7m
OR Prodigy 9.5.
OR Prodigy 12m
2014 Rebel 5m and 8m
OR 17M Flite
OR Duke
Cabrinha Phenom 5'8
Brand Affiliation: None

Re: Low Aspect rear wing/stab

Postby atomic-chomik » Sat Dec 23, 2017 4:45 pm

Thanks P_F. I foiled last summer with a stringy setup. Im not expert but i can foil anyways.
I just couldn't help myself from trying to build a setup, it has compelled me somehow lol.


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