Swept back hull appendages. A thing of the past?

Paul Scott · Jun 20, 2024

Another thing to consider- how much weather helm do you have? More helm suggests more stress on flow. Also, the farther back the rudder is, the more leverage, & vice versa, so size can change.

wet feet · Jun 20, 2024

Paul Scott said: ↑

that does beg the question of where the upwash washes up to on the stern hung rudder- just on the leading edge? On the whole foil? If the upwash is mainly on the leading edge, can envision it climbing up on the leading edge, and collapsing into a trough mid section leading to
ventilation, to say nothing of a wave knocking the rudder into ventilation. Depends on the foil- one strategy among windsurfers is to have the surface piercing part of the skeg a different section that doesn’t develop as much lift, and that seems to tame ventilation.
Interesting read on Fins | Windsurfing Forums, page 1 - Seabreeze https://www.seabreeze.com.au/forums/Windsurfing/General/Interesting-read-on-Fins?page=1
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It has been quite normal for racing dinghies to have a sharp entry to the rudder at the waterline.Pierre Gutelle recommends something similar for centreboards,but I haven't seen too many of those.

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Swept back hull appendages. A thing of the past?

Paul Scott Senior Member

wet feet Senior Member

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