How do you read a polars boat?

How do you read a polars boat?

You can read the Polar Plot by placing the boat on the C curve and tracing around the concentric arc to determine the speed of the boat. For example, click on 60, this will point the boat so that it is sailing at 60 degrees off from the wind direction. Now trace around the arc to see that the boat is achieving 8 knots.

What are boat polars?

Polars are a way of presenting boat speed vs true wind angle at a variety of true wind speeds that help you determine the fastest point of sail. They are called polars because they are a plot of boat speed and true wind angle on what is called a polar plot.

How do ORC ratings work?

The ORC rating system does not compare the characteristics of one boat to another; it measures how a racing crew can reach their boat’s theoretical performance potential. Thanks to the VPP, ORC can calculate the theoretical speeds that a boat should achieve on a given race course in the given conditions.

Do boats use polar coordinates?

Every type of boat has its polar diagram (or VPP, velocity prediction program), computed from hull shape, weight, rigging and a sail setup. Seapilot uses the polar diagram to compute the fastest choice of path at a given forecast for wind (and current).

How do I get an ORC certificate?

It’s easy to get an ORC Club certificate for your boat. Just fill-out this on-line form, and the data will be processed and sent to the relevant ORC national rating office who will then contact you with any additional information needed, the certificate cost*, and when your certificate is ready.

What is a good comfort ratio on a sailboat?

You can use the following guidelines to interpret comfort ratio results: numbers below 20 indicate a lightweight racing boat; 20 to 30 indicates a coastal cruiser; 30 to 40 indicates a moderate bluewater cruising boat; 50 to 60 indicates a heavy bluewater boat; and over 60 indicates an extremely heavy bluewater boat.

How much ballast do I need for 1 cubic Metre of concrete?

How much ballast do I need for 1m3 concrete? In this regard, “how much ballast do I need for 1m3 concrete?”, generally, you need 58 bags of 25kg (total 1458kg) ballast or 1.7 jumbo or bulk bag of 1 loose tonne ballast for 1m3 of concrete by using standard mix of 1:5 (1 cement:5 ballast).

How do you use VMG in sailing?

The northward component of the boat’s velocity vector is found by multiplying the boat speed (VB) by the cosine of the angle between the true wind direction (north) and the sailboat’s heading. In this case, the optimal VMG is obtained on a heading of 60 degrees from the true wind (60 degrees NE or 300 degrees NW).

How do you read a polar sailboat chart?

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 is the meaning of polars?

1 : of or relating to one or more poles (as of a spherical body) 2 : exhibiting polarity especially : having a dipole or characterized by molecules having dipoles a polar solvent.

What is ORCi in yacht racing?

The ORCi stability index is derived from the old IMS stability index which is something that we all know and trust in a comprehensive fashion. It’s used today to determine whether boats meet the stability requires for the Hobart race. ‘ORCi is a transparent rule while IRC is not. There are pros and cons for each rule.