I can confirm that MaxSea TZ does have a comprehensive polar diagram creation option. It does not assume that the port and starboard speeds are symetrical (like some software). And you can create the diagram automatically
You can then edit the results to take into account special considerations on the day that you made your recording – such as sea state.
You can also store diagrams according to differing sail sets that you are likely to use.
[...] For some time Fugawi has produced a perfectly good piece of navigation software Fugawi ENC. I must confess I have not had time to review it in detail, so much time was spent with my 7 part optimal routing series last year and with testing MaxSea TZ in action. [...]
This is part 4 of the quest for the best optimal routing calculations within ECS/ECDIS systems today. In this posting I wanted to consider the use of polar diagrams and data that represents the performance of the boat in a variety of wind conditions.
Of course wind cannot be taken in isolation when comparing your actual boat performance against any given polar diagram. The manufacturers polar diagram will tend to be an idealised version of what your boat will do at its design weight and under good sea conditions. The most likely source of polar table information is a velocity prediction program, or VPP: a computer program that uses information about the boat’s design—the hull lines, rig plan and so forth—to predict the yacht’s performance.
The image to the left for example, shows a pretty good polar diagram supplied for a Catalina 30 – and here you can see it notes that this was with a 150% genoa and the boat had a folding propeller.
Software designers sometimes incorporate other factors at this stage that will either automatically or manually take into account wave height, and other boat performance characteristics such as surfing down large waves for example. For a glimpse of the maths involved in calculating polar diagrams have a glance at this presentation from Pau Herrero, Luc Jaulin, Josep Vehi, & Miguel A. Sainz
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I can confirm that MaxSea TZ does have a comprehensive polar diagram creation option. It does not assume that the port and starboard speeds are symetrical (like some software). And you can create the diagram automatically
You can then edit the results to take into account special considerations on the day that you made your recording – such as sea state.
April 19th, 2010|
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[...] For some time Fugawi has produced a perfectly good piece of navigation software Fugawi ENC. I must confess I have not had time to review it in detail, so much time was spent with my 7 part optimal routing series last year and with testing MaxSea TZ in action. [...]