0:51 Ride high 3:09 Keep runs short 3:31 Focus on learning 4:04 Get video feedback 4:46 Learn to take off using the board 5:57 Do learn the foot swap 6:47 Stop blaming gear 7:48 Ask for help!
Drag control is key, obviously, but water density does not change by depth. Water and liquids cannot be compressed like air (air density changes by heigth) but, although water preasure increases by depth, liquid density is constant even in the deep sea.
Not entirely correct. The density (specific gravity) of water does differ with depth especially where there’s been rain or you are near freshwater river mouths. This difference can occur for a few meters from the surface down.
Absolutely true about water being an incompressible fluid, any engineer or scientist will catch this. I've seen this misconception elsewhere, I'm not sure where it comes from. As far as fresh and salt water, I suspect that anywhere there is wave action, they would be mixed pretty quickly. Salt water is only about 2.5% more dense anyway, not much difference in lift, drag, or buoyancy of the submerged components.
The depth only matters because the wing induced drag is decreased when close to the surface of the water just like an airplanes induced drag decreases close to the ground. It’s called ground effect. With a foil it could be called surface effect.
@@Giroux68 Ground effect of an airplane is caused primarily by the ground or water obstructing the creation of wingtip vortices and interrupting downwash behind the wing, also called "cushion effect." With an hydrofoil the air above the water is of very low density compared to the water, so the air will not obstruct the waterflow, the wing will push the water up to a small wave. And while an airplane feels ground effect underneath a wing, the air is above a hydrofoil, not underneath. I read on the net that the resistance of a hydrofoil with a small angle of attack as is the case with our hydrofoils, the resistance can be a bit bigger close to the water surface but I think it is unnoticable. I also read that density of water in choppy seas can be a bit less due to mixing with air and this effect is the greates close to the surface. So a little less resistance (but also less lift) in (breaking) waves.
Thanks Gav! Sharing video sessions is a top idea, as is having at least 20 mins or so of technique focus in a session and doing short runs before gybe/tack/whatever
I found my foiling improved so much when I started recording myself for this channel. You can see the mistakes instantly. I still ask people on my beach to help me out with my technique.
Superb tips, thanks Gav. Couldn’t agree more about riding high on the mast. I’m only using one foil these days (HA680) and it wants to be ridden high in the water. Especially as you said, once you start riding fast moving ocean swell. It comes alive. Like finding another gear. But it takes a lot of concentration. I also constantly remind myself to do. Together with keeping my back foot over the mast.
Thanks mate. Yes, so true about the HA680, and yes, it takes lots of concentration to stay there. I often find myself back riding low without noticing. Also, great tip about the back foot. That is so important and often lover looked.
Think the key to flying high is having a foil that can handle tip breaches without crashing. Axis ART fall if tip was breached. Axis ART V2 can be sailed up wind with the tips out of the water. ( yes you can blame the gear sometimes) This provides confidence to ride higher and higher. Best feeling is sailing high and feeling the chop effect the foil and playing with how much foil can come out of the water.
Thanks for your video tips, I will no longer blame my kit, I can now blame you, lol. Joking. Many thanks. I need to practice my switch feet, I just can get my head round it, and it's winter now so I don't want to fall in the water, so I might wait till the summer.
FWIW, there is no difference in the density of water depending on the depth as water is basically incompressible. (I've looked up an example, and 4km deep in de ocean water would be 1.8% denser than on the surface. That's basically nothing, and given that we're talking about a 1/2m difference here...) The reduced drag can only come from less mast under the water.
Great video. You connect well on camera!
And a load of good sensible points
Thanks mate. Really appreciate it
0:51 Ride high
3:09 Keep runs short
3:31 Focus on learning
4:04 Get video feedback
4:46 Learn to take off using the board
5:57 Do learn the foot swap
6:47 Stop blaming gear
7:48 Ask for help!
Thanks, forgot to add this when posting!
One of the best video on progressing. You guys area gift which keeps on giving. Thank you!
Wow, thank you!
Drag control is key, obviously, but water density does not change by depth.
Water and liquids cannot be compressed like air (air density changes by heigth) but, although water preasure increases by depth, liquid density is constant even in the deep sea.
Thanks for pointing that out, I didn’t know that but it seems obvious now that you’ve mentioned it. Very interesting.
Not entirely correct. The density (specific gravity) of water does differ with depth especially where there’s been rain or you are near freshwater river mouths. This difference can occur for a few meters from the surface down.
Absolutely true about water being an incompressible fluid, any engineer or scientist will catch this. I've seen this misconception elsewhere, I'm not sure where it comes from.
As far as fresh and salt water, I suspect that anywhere there is wave action, they would be mixed pretty quickly. Salt water is only about 2.5% more dense anyway, not much difference in lift, drag, or buoyancy of the submerged components.
The depth only matters because the wing induced drag is decreased when close to the surface of the water just like an airplanes induced drag decreases close to the ground. It’s called ground effect. With a foil it could be called surface effect.
@@Giroux68 Ground effect of an airplane is caused primarily by the ground or water obstructing the creation of wingtip vortices and interrupting downwash behind the wing, also called "cushion effect." With an hydrofoil the air above the water is of very low density compared to the water, so the air will not obstruct the waterflow, the wing will push the water up to a small wave. And while an airplane feels ground effect underneath a wing, the air is above a hydrofoil, not underneath.
I read on the net that the resistance of a hydrofoil with a small angle of attack as is the case with our hydrofoils, the resistance can be a bit bigger close to the water surface but I think it is unnoticable. I also read that density of water in choppy seas can be a bit less due to mixing with air and this effect is the greates close to the surface. So a little less resistance (but also less lift) in (breaking) waves.
Thanks Gav! Sharing video sessions is a top idea, as is having at least 20 mins or so of technique focus in a session and doing short runs before gybe/tack/whatever
I found my foiling improved so much when I started recording myself for this channel. You can see the mistakes instantly. I still ask people on my beach to help me out with my technique.
Superb tips, thanks Gav. Couldn’t agree more about riding high on the mast. I’m only using one foil these days (HA680) and it wants to be ridden high in the water. Especially as you said, once you start riding fast moving ocean swell. It comes alive. Like finding another gear. But it takes a lot of concentration. I also constantly remind myself to do. Together with keeping my back foot over the mast.
Thanks mate. Yes, so true about the HA680, and yes, it takes lots of concentration to stay there. I often find myself back riding low without noticing. Also, great tip about the back foot. That is so important and often lover looked.
Great video!!!❤
Thank you!!
Great stuff 😊
Thank you! Cheers!
Think the key to flying high is having a foil that can handle tip breaches without crashing. Axis ART fall if tip was breached. Axis ART V2 can be sailed up wind with the tips out of the water. ( yes you can blame the gear sometimes) This provides confidence to ride higher and higher. Best feeling is sailing high and feeling the chop effect the foil and playing with how much foil can come out of the water.
I agree with you, it’s so frustrating to learn with a foil that is not good at breaching. Not impossible, but very frustrating.
Thanks Gav 👍
You’re welcome mate!
Thanks for your video tips, I will no longer blame my kit, I can now blame you, lol. Joking. Many thanks.
I need to practice my switch feet, I just can get my head round it, and it's winter now so I don't want to fall in the water, so I might wait till the summer.
Haha, happy to take the hit. Yes, learning to switch feet will involve lots of falls but it’s worth it. You’ll smash it.
I have two aluminum masts… a 60 and 70.
I think 70 would be the go.
FWIW, there is no difference in the density of water depending on the depth as water is basically incompressible. (I've looked up an example, and 4km deep in de ocean water would be 1.8% denser than on the surface. That's basically nothing, and given that we're talking about a 1/2m difference here...) The reduced drag can only come from less mast under the water.
Yes, thank you for that.