The first two are starting to look very much like the Inland Lake Yachting Association scows. I've aways viewed a scow as a narrow monohull being...
My experience with a tail-controlled wingsail on a landyacht was the tail control was very effective at alleviating the impact of gusts. Which,...
Three conditions are needed for static stability in the vertical plane. Starting from equilibrium flight: - An increase in height at constant...
That happens somewhat automatically, by virtue of the boat's pitch stability. The daggerboard rake is controlled by the crew to keep the vertical...
Yes. Probably the most universal way is to delete the first line from the XFOIL coordinates file, leaving only the numbers. Then import that as...
What you're seeing in the boats' behavior is unstable pitch-heave coupling. Basically, the boat is rotating about the stern. This leads to an...
NACA sections are not the best choices for a hydrofoil. A NACA 6-series section might be a good start, but you'll need to use a tool like XFOIL...
Does this approach help? You can draw conic sections using classic drawing instruments without doing any numerical calculation. IIRC, the P-51...
The XFOIL Type 3 polars are designed for this kind of analysis. The idea is the section produces a fixed amount of lift, with low lift...
The H105 is probably a good starting point, but as you point out, the best section is one that is designed to your requirements. You have a...
A wingsail needs to be "flown" 100% of the time, since it can't be taken down like a soft sail, and it doesn't luff. An electronic control system...
Good job! You've provided a great example of how to go about investigating and resolving new boat design ideas.
Dolfiman has the commands correct. I would use even lower values of Ncrit, say 1<Ncrit<3. I also run cases with the boundary layer fully...
The bow-down attitude was largely a result of the Design Rule. The Rule allowed changing the incidence of both the dagger foils and the rudder...
Cavitation is avoided by designing foil sections whose minimum pressure/maximum velocity does not exceed the cavitation threshold. Sections...
Yes. See this website. Here's an example of the tradeoff you're seeking: [IMG]
If the boundary layer is fully turbulent, there is very little difference in minimum profile drag between different section shapes. The profile...
When comparing section characteristics with XFLR5 or XFOIL, you need to pay attention to the viscous parameter settings. Boundary layer...
I've some experience sailing a landyacht with a tail-controlled wingsail. We experimented with tail control alone, tail control coupled with flap...
Yes, and yes. For example, the AC72 yachts in San Francisco even took it a step further and used negative lift at the head! They would have had...
