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1:7 is a commonly quoted figure. So wave height 1 to a ratio of wave length 7. Meaning a wave greater than say, 2 meters in height with a wavelength of less than 14 meters is likely to become unstable and break. There is a formula for converting wave period to wave height to wave length to wave height, but I can't remember it right now.
It's based on wave height and wavelength, not period. "There are some varying estimates of the scientific, precise moment when the wave will collapse, but generally, when the wave height exceeds the wave length at a 1:7 ratio, it may begin to collapse.
The wave speed (S in knots) in deep water is related to the period by S=3.03P. So, a wave with a period of 4 seconds has a length of 80 feet and a speed of 12 knots. If it moves into an area where there is a contrary current of 3 knots, the wave's speed drops to 9 knots. A wave with a speed of 9 knots has a period of 3 seconds and a length of ...
For example, Tartan 30's rate about the same as J/24's (~170) but they're so dissimilar that the racing isn't very close. In our area we have a couple Laser 28's, J/30's, J/29's, and a Pearson Flyer that make for pretty close racing (PHRF ~129-150). There are also 30' boats that are much faster (e.g. Henderson 30, PHRF ~45) but they usually end ...
NMEA 0183 is like serial communications that old computers used. NMEA 2000 is more like Ethernet networking. The two are not interoperable at all. Most DEVICES (plotters, radios, etc.) that can accept NMEA 2000 INPUT will also accept NMEA 0183, but this is because the device will have two or more communication powers.
The Coaster was designed to the MORC Rating rule of the day, which produced reasonably wholesome boats in terms of moderately longer water lines than was the trend for that era and more efficient underbodies and higher ballast ratios than was typical for the more popular CCA rating rule derived designs such as the Alberg 30 or Pearson Vanguard.
S. SailNet Archive. 87689 posts · Joined 1999. #2 · Dec 20, 2002. If your belt drive is new enough you might save some money by using your contol head with a new 4000 drive however the newer computers are much better than the old. My personal preference is for the Raymarine. I have had both the first and second generation of wheel pilot and ...
WDS123. 646 posts · Joined 2011. #15 · Jan 17, 2012. A tapered mast will (typically) be able to be better in heavy air, because the spar will react more when backstay tension is applied - opening up top of mainsail leech and tensioning forestay. A tapered mast also looks better (purely subjective).
Huge difference between the boats. The Wave is a toy - the 16 is a serious boat (with flaws). The 16 isn't "much faster in light wind" -- it is much faster period. The difference in set-up times is negligible (less than 5 mins diff once you're experienced). It is also much more capable.
Rigs-cutter vs. sloop rig. Today these terms are used quite loosely as compared to their more traditional definitions. Traditionally the sloop rig was a rig with a single mast located forward of 50% of the length of the sailplan. In this traditional definition a sloop could have multiple jibs. Cutters had a rig with a single mast located 50% of ...