High-Speed Sailing

I watched, with interest, the videos of the 34th America’s Cup. At last we have fast sailboats engaged in a competition that is fun to watch. The virtual images (such as course boundaries, distance grid lines, separation between boats, etc.) overlaid on the real images really helps to keep the race [...]

100 Knots for Hydroptere?

The latest news from Hydroptere is that they have plans for a 100 knot sailboat. This was posted on 26 Aug 2013, so look for that date at this address. http://hydroptere.com/en/the-news/last-news/

Aptly named Sailrocket, blasts off!

While yet to be ratified, Sailrocket posted an average speed over 500 meters of 59 knots. I will not be surprised if they increase their record into the 60 knot range during this record attempt.

02 January 2012

More drag for VSR2?

I want to start by pointing out that the whole VSR2 team has done a stellar job and has demonstrated conclusively that the forces that drive a sailboat can be aligned for roll stability without using ballast and without using any down-force. (Trifoiler achieved roll stability by using down-force, but [...]

18 December 2011

My analysis of Sailrocket

I copied a diagram of VSR2 (wing doesn’t show well) and added in the major force arrows that apply. Be aware that these arrows are not correct in terms of scale (length) and some of their locations are guesses, however I believe I’m correct enough for us to learn something about what VSR2 has been [...]

60 is within reach, what’s next?

I have been watching Sailrocket’s progress with great interest and there’s no question they have a winner. I fully expect to see them reach 60kt in the near future. Sailrocket has now demonstrated what I first learned with my models and again with my full-sized prototypes, that if you get the forces [...]

Sailien force diagrams final #4

12 December 2008

This fourth diagram is the view from the position of the blue dot/arrow in the preceding diagrams.
On the left is a representation of Sailien's airfoil with the blue arrow showing the "lift" force, the small black arrow represents aerodynamic drag on the airfoil.
On the right is a representation of the windward (leeway resisting) hydrofoil with its blue "lift" arrow and black drag arrow.
The two triangles represent the leeward hydrofoils also with their corresponding drag arrows.
The dashed lines are extensions from the "lift" forces.
The bold red arrow is the resultant force produced by the two "lift" forces (by vector addition of the blue arrows). Note that in the preceding diagrams you were "looking" at the tail of this red arrow (the red dot).
The bold black arrow represents the sum of all the small drag arrows.
Note that in this view, the bold red and black arrows are in alignment; however the black arrow is actually lower than the red arrow. (I omitted this drag arrow from the preceding drawings: it would have been a black dot below the red dot.)

I'll continue this later.

Bob

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