Foil Tech Talk: Stabilisers

[gmb13]

Would you like to know how the stabiliser on your foil works and how to tune it to make your ride? Check out the video.




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Gunnar

[iriejohn]

Belongs in the Hydrofoil forum.

viewforum.php?f=196

[jumptheshark]

great video

[Huib]

Long fuselage + small stab = Short fuselage + big stab ?
I had just opened a topic about this but I have not really received a good answer. But soon I can experience it in practice because I have both, small stab and short fuselage.
Do you have an answer for this?

[Breze]

Here is a good explanation of George , why the foil is pitching down and needs a stab
also there is a part 2

Thats a very professional way to play with the size of the stab

[kitexpert]

Good video but shimming advice was wrong, in that configuration shimming should be done on the back side of stabi to get more stabilizing effect. Angles were explained correctly.

[gmb13]

Good video but shimming advice was wrong, in that configuration shimming should be done on the back side of stabi to get more stabilizing effect. Angles were explained correctly.

Depends on which way up the foil is when you do it. I did specify that in the video. On the Moses Stabs you want to shim the front as they are bottom mounted.

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Gunnar

[windmaker]

Long fuselage + small stab = Short fuselage + big stab ?
I had just opened a topic about this but I have not really received a good answer. But soon I can experience it in practice because I have both, small stab and short fuselage.
Do you have an answer for this?

Basically the same except that bigger stab/short fuse will be effective at a lower speed, smaller stab long fuse will "catch" at a higher speed. Also, I guess the effectiveness of a bigger stab will increase exponentially at greater angles whereas smaller stab will be more linear whatever the angle.

[kitexpert]

Good video but shimming advice was wrong, in that configuration shimming should be done on the back side of stabi to get more stabilizing effect. Angles were explained correctly.

Depends on which way up the foil is when you do it. I did specify that in the video. On the Moses Stabs you want to shim the front as they are bottom mounted.

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Gunnar

Think again. And don't start to mess it up by turning foil, always think it like it is when it is in the water. And whether foil is upside down or not it doesn't have any relevance to shimming.

I assume your advice was for the foil in your video, IDK if it is a Moses or not. Stab is on top of the fuse and it should be shimmed from the back to get more downwards lift (which you showed correctly in stab AoA).

[gmb13]

Good video but shimming advice was wrong, in that configuration shimming should be done on the back side of stabi to get more stabilizing effect. Angles were explained correctly.

Depends on which way up the foil is when you do it. I did specify that in the video. On the Moses Stabs you want to shim the front as they are bottom mounted.

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Gunnar

Think again. And don't start to mess it up by turning foil, always think it like it is when it is in the water. And whether foil is upside down or not it doesn't have any relevance to shimming.

I assume your advice was for the foil in your video, IDK if it is a Moses or not. Stab is on top of the fuse and it should be shimmed from the back to get more downwards lift (which you showed correctly in stab AoA).

In that case yes, but in the case of the Moses Stabilizer I have in my hand no.

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Gunnar