Does a wing paddle surface area include the leading edge lip?

2 weeks 5 days ago #37622 by MCImes
Maybe one of the OEM's or knowledgeable among you knows - does the stated surface area of a blade only include the 2 dimensional "shadow" profile of the blade, or does it take into account the airfoil lip (i.e. a 3 dimensional surface area that accounts for the part of the blade that is perpendicular to the blade?

I see most blade dimensions stated in a simple X by Y dimensions, but really there is surface area in XYZ plane with the airfoil shape of the blade.

I understand this may vary from brand to brand, but I would think they follow some sort of similar standard when measuring.

Currently - Swordfish S in Southern California's ocean waters
Past Boats: Epic V10 g0, Stellar SR g1, Fenn XT g1
"When you've done something right, they wont know you've done anything at all"

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2 weeks 4 days ago #37625 by leolinha
I have a Think Powerwing paddle that has a stated area of only 655 cm2, the smallest blade area I know of.
As a comparison, the smallest Epic wing paddle (small mid wing) has a nominal area of 735 cm2.
But the Powerwing, although small, has a very large "airfoil lip", deeper than any other paddle I've ever seen. For this reason, I doubt that the nominal surface area takes into account the entire area of this internal curve.
So I think that the nominal surface area of a blade is, in fact, the area of its shadow profile, as you mentioned.

Current: Epic V8 PRO, Think Evo 3
Past: Epic V8, Epic V10 Sport

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2 weeks 3 days ago #37631 by waverider
I have a generic wing paddle which is on the small sized. No idea of what size it is supposed to be. Any idea of any easy way to measure as a comparison?

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2 weeks 2 days ago #37646 by leolinha

waverider wrote: I have a generic wing paddle which is on the small sized. No idea of what size it is supposed to be. Any idea of any easy way to measure as a comparison?


There is no easy way to measure the area of such an irregular shape as a wing blade, even if only its projection (shadow) is what we are talking about. I bet that the manufacturers "measure" it with the computer program used to design it, then never again!

Current: Epic V8 PRO, Think Evo 3
Past: Epic V8, Epic V10 Sport

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2 weeks 2 days ago - 2 weeks 2 days ago #37648 by LaPerouseBay

leolinha wrote:

waverider wrote: I have a generic wing paddle which is on the small sized. No idea of what size it is supposed to be. Any idea of any easy way to measure as a comparison?


There is no easy way to measure the area of such an irregular shape as a wing blade, even if only its projection (shadow) is what we are talking about. I bet that the manufacturers "measure" it with the computer program used to design it, then never again!


Ha ha, it's actually pretty basic stuff these days.  Here's a free trial.   
www.sketchandcalc.com/

Epic mid is advertised as 750, Odin at 765.  That agrees with my eyeball calculation.  The Odin has a more  forgiving catch and release, so I can run the shaft longer.  Great blade.  Highly recommended for downwinding.  Very light.

I may try to scale photos of each on Autocad.  But, IMO, it's the shape that matters - more than the area.  Where's 'Kayakchampeen" when you need him?  That guy knew blade shapes!  Sad I missed his exit from the forum, he was a whiz.     

downwind dilettante

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2 weeks 2 days ago #37649 by mrcharly
Blade shape is very important, as LaPerouseBay said.

I tried lots of paddles before buying my jantex - it has a really hard catch and I consequently ordered a smaller blade. Glad I did. 

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5 days 16 hours ago - 5 days 15 hours ago #37746 by Atlas
I miss Kayakchampeen too. A loose cannon alright. You sure didn't want to be in his crosshairs but damn; he knew about paddles! And plenty more about hydrodynamics.

Current skis:
Epic V10L Ultra & Club, Carbonology Sport Boost LV, Fenn Bluefin, Nelo 510, Fenn XT double

Previous skis
Spirit PRS, Fenn Swordfish, Fenn XT, Fenn Swordfish S, Think Zen

Most with DK rudders.

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5 days 15 hours ago #37747 by waverider

waverider wrote: I have a generic wing paddle which is on the small sized. No idea of what size it is supposed to be. Any idea of any easy way to measure as a comparison?


i put it up against a braca iv 735 and it seems just a bit smaller . The curve was definitely substantially shallower....Dont know just how much difference a paddle up grade will make but I guess its getting time to put one on the shopping list soon.

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