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High vs Low Aspect Foils for Surf Foiling, with Ewan Jaspan

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High vs Low Aspect Foils for Surf Foiling, with Ewan Jaspan

Postby Toby » Fri Jun 11, 2021 5:14 pm

hank you to Ewan Jaspan for sharing his insight on surf foiling, kite foiling, and wing foiling on the Naish JET and Naish JET HA series of hydrofoil wings.

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grigorib (Fri Jun 11, 2021 9:10 pm)
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Re: High vs Low Aspect Foils for Surf Foiling, with Ewan Jaspan

Postby grigorib » Fri Jun 11, 2021 8:10 pm

I took out the Moses 1000 for kite session and I felt I started surfing down that tiny 2 feet swell. With AR of 10.1 it wasn’t turning as easy as my other wings but surfing capabilities were amazing.

So far I can generalize foil geometry into few simple observations:
- wing area impacts lowend and stall speed for given rider weight
- wing profile thickness impacts cruising speed and lift
- AR impacts glide, turning/pumping ability and roll stability
- fuselage length almost doesn’t matter
- HA stabilizers are almost always a better choice
- stabilizers with winglets add significant yaw stability
- wing LE arrowhead-shape improves seaweed resistance

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Re: High vs Low Aspect Foils for Surf Foiling, with Ewan Jaspan

Postby Kamikuza » Sat Jun 12, 2021 4:38 am

grigorib wrote:
Fri Jun 11, 2021 8:10 pm
- fuselage length almost doesn’t matter
Can't agree with that.

Before I bought my present foil, I demoed a bunch of gear and when I'd narrowed down wing and stab configuration, I tried them with regular, Short and Ultra-short fuselages: 76.5, 68 and 62.5cm respectively.

Went with the Short because the Ultra-short was just too loose and twitchy for my tastes, while the Short is a nice compromise. Regular was noticeably more stable, and slower to react.

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