Foil aspects explained ?

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Created by

Krist > 9 months ago, 1 Jun 2019

Clamsmasha

311 posts

30 Jul 2019 4:25pm

Ah, they use the the simpler rectangular planshape formula.

Span divided by chord.

Camarillo

369 posts

30 Jul 2019 4:58pm

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Clamsmasha said..
Not projected for aspect ratio, always actual area.

Ok thanks.
Then it is:

Had about 8 sessions (prone) on my Axis 900/ultrashort & 440 on a 75cm mast, I'm 73kg.

(+) The amount of lift is nice on take off when popping up, glides really well & easy to create speed by turning or pumping - even in tiny waves.
Pumps very good (linked my first couple of waves on the 900)

(-) If your about to breach, there's no gurgling sound for a warning, you get ejected silently in a millisecond

Camarillo

369 posts

30 Jul 2019 7:56pm

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toppleover said..
(-) If your about to breach, there's no gurgling sound for a warning, you get ejected silently in a millisecond

I have never heard any gurgling from any foil, my hearing aid is not waterproof

balinnz

17 posts

31 Jul 2019 4:24am

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Camarillo said..
The Aspect Ratio of a wing is defined to be the square of the span divided by the wing area and is given the symbol AR.

But should the projected area be used for that?

For instance for the Axis S102:

With projected surface: 102^2/2013= 5,168

In the foil database: docs.google.com/spreadsheets/d/17xbTGEWSVeRhnYb_4vz_Gmby8UnrDys7Q1iB-6rC6F4/edit?usp=sharing

Some of the entries for AR are calculated with the right formula, with projected or 'normal' surface and some of then are just the number.
But some of these numbers are not right imo.

For instance Axis:

My bad, I thought aspect ratio was based off span and chord only not including area.
Thats why most of these will be wrong haha

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