How do you read a polar sailboat diagram?
Polar plots are published by each manufacturer for each model of boat with their various sail plans. It’s easy to read – move your finger radially along any true wind angle. Stop when you reach the boat performance line associated with the true wind speed you are experiencing.
How do ORC ratings work?
ORC ratings seem to vary depending on the race course type and the conditions. ORC Triple Number scoring recognizes wind speeds as either Low (<9 knots), Medium (9-14 knots) or High (15+ knots), which will be signaled by the Race Committee – the Sailing Instructions for the ORC courses will give further details.
What does a polar diagram tell us?
A polar diagram describes how fast a sailing boat may go at different wind speeds (TWS) and in different angles to the wind (TWA). Every type of boat has its polar diagram (or VPP, velocity prediction program), computed from hull shape, weight, rigging and a sail setup.
What is Polar speed adjustment?
The polar speed adjustment is a percentage adjustment on your set base polars. Having it set at 100% reflects your set base polars, however you may wish to adjust these polars. For example setting the polar speed adjustment to 90% will take 10% off your set polar speeds for your next weather routing download.
What is ORC handicap?
ORC Club provides an alternate view to PHS on a boat’s performance in a race. Unlike PHS handicapping, ORC Club handicap remains the same from week to week irrespective of how well a boat was sailed in previous weeks. ORC Club prevents any competitors from sandbagging to attempt to try to adjust their handicap.
What is a sailboat polar?
A polar diagram, or polar plot, is a graph that shows a sailboat’s potential speed over a range of wind speeds and relative wind angles. It normally consists of the right side of a line chart with the radius representing the yacht speed and the angle representing the wind direction blowing from top to bottom.
What are polar area diagrams?
Polar area diagrams are a mix of pie charts and histograms. They have identical angles and extend from the plot’s center depending on the magnitude of the values that are plotted.
What is the difference between a sloop and ketch?
A sloop rig has 1 mast, with a jib and mainsail. A cutter is a sloop with 2 foresails(jib, staysail) and a mainsail. A ketch has 2 masts. It has a foresail,main and missin.
What’s the difference between a sailboat and a schooner?
By definition, a schooner is a sailboat with at least two masts, with the forward mast (foremast) being a bit shorter than the main mast. Although a schooner can have more than two masts, most were just two.
What is a polar diagram on a boat?
Polars A polar diagram describes how fast a sailing boat may go at different wind speeds (TWS) and in different angles to the wind (TWA). Every type of boat has its polar diagram (or VPP, velocity prediction program), computed from hull shape, weight, rigging and a sail setup.
How to import a polar diagram to seapilot?
The polar diagram is imported to Seapilot as a polar file in text format (.txt, .csv or .pol). The name of the boat type or the specific boat is suitable to use as a name of the file (for instance J80.txt). Here at our website you can get access to polar diagrams for more than three hundred boat types.
How big is the keel on a NJ 122?
J/122 is a versatile 40 foot performance sailboat with comfortable live-aboard accommodations, a refined deck layout, low VCG keel with a moderate 7.2′ draft. The hull & deck are built using superior infusion molding technology to maximize durability and long term value.
How do I get polar data from a boat?
Choose the Boat tab and give a name to the boat. Under Parameters, record boat’s length, displacement and sail areas. Check the polar data created by the program under Polars and Values. Tap the letter symbol and send data (will be as a .txt file) to your own e-mail address.