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Sailmon Calibration Manual and Data Reference V1.5 Sailmon © 2018 2

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Sailmon Calibration Manual and Data Reference V1.5 Sailmon © 2018 2 SAILMON Instrument system Calibration Manual and Data reference Version 1.6 October 2018 Sailmon Calibration manual and data reference V1.5 Sailmon © 2018 2 Contents 1 Calibration Preparations .................................................................................................. 4 Calibration basics ............................................................................................................... 4 2 Definitions ..................................................................................................................... 5 Wind Gradient ................................................................................................................. 5 Wind Shear ..................................................................................................................... 5 Upwash And True Wind Direction Tacking ...................................................................... 6 Velocity made good (VMG) ............................................................................................10 Velocity made good on course (VMC) ............................................................................10 Downwind Acceleration ..................................................................................................11 Velocity prediction and polar diagram ............................................................................12 Sailmons wind calculation principles ............................................................................17 Measuring Boatspeed .......................................................................................................20 Paddle wheel sensors ....................................................................................................20 Ultrasonic sensors .........................................................................................................23 3 Sensors ........................................................................................................................28 Wind Sensors ....................................................................................................................28 Heading sensors ...............................................................................................................29 Floating Core .................................................................................................................29 Fixed Core with accelerometer correction ......................................................................29 Gyro stabilized compass ................................................................................................29 gps cOMPASS ...............................................................................................................30 Boatspeed Sensors ...........................................................................................................32 Depth Sensor Requirements .............................................................................................32 GPS Sensors ....................................................................................................................33 4 Calibration ....................................................................................................................34 Start the Sailmon Tool .......................................................................................................34 Depth Sensor calibration ...................................................................................................35 Basic Calibration .........................................................................................................35 Heading Sensor Calibration...............................................................................................37 Basic and race calibration ..........................................................................................37 Attitude sensor calibration .................................................................................................38 Basic and race calibration ..........................................................................................38 GPS Calibration ...............................................................................................................39 Boatspeed Calibration .......................................................................................................40 Basic Calibration .........................................................................................................40 Race Calibration ............................................................................................................43 GPS Boatspeed Mode ................................................................................................45 Sailmon Calibration manual and data reference V1.5 Sailmon © 2018 3 Wind Calibration ................................................................................................................46 Basic Calibration .........................................................................................................46 Race Calibration ............................................................................................................47 Environment Sensors Calibration ......................................................................................54 Additional Sensors Calibration ..........................................................................................55 Leeway Calibration ............................................................................................................56 Load Cell Calibration .........................................................................................................57 5 Data names and description .......................................................................................58 6 Sailmon data values.....................................................................................................59 7 B&G Values on a Sailmon monitor .............................................................................61 8 Nexus Values on a Sailmon monitor ..........................................................................63 9 Expedition Values on a Sailmon monitor ...................................................................65 Sailmon Calibration manual and data reference V1.5 Sailmon © 2018 4 Calibration Preparations During the calibration you will have to go sailing under power. Choose a day with light to moderate wind and low waves. Best results are achieved when the tidal currents are a minimum in the area you perform the calibration. Choose an area with low traffic and much space, and enough depth to allow safe navigation. This section gives details about everything you need for a perfectly calibrated system. Everyone knows it is a time consuming task to calibrate. But as a friend once said: A snail is a very slow animal. It might crawl about 20 meters per hour. This is 0.01kn. But in 5 hours it will also crawl 100 meters or 330 feet. Calibration basics Advanced calibration is necessary if you will use velocity prediction and polar diagrams. The most important values for a performance race boat are true wind speed and direction. Unfortunately, this is also the value which is most difficult to measure, since there are a number of physical effects which directly affect the accuracy of the measurement. In addition, true wind is calculated out of a number of other values, which are not easy to measure accurately too, like boatspeed and leeway. So, what is the reason why true wind is such an important value? It’s simply the fact that polar diagrams and velocity prediction programs (VPP) always reference to true wind. This means during simulation the algorithms take a constant wind, which is simulated to flow over the surface. This is definitely not the wind your sensor will measure, since there are unlovely effects like upwash, mast twist, gradient, shear etc. If you want to compare polar speeds and angles with your actual ships condition, you have to measure the true wind without the bad aero dynamical effects described before. The bad thing is that this is not possible in a direct way. Fortunately with tricks, it is possible to correct for this bad influences. Sailmon Calibration manual and data reference V1.5 Sailmon © 2018 5 Definitions Wind Gradient This is the difference in wind speed from the mast top down to the water surface. Due to friction of the air molecules over the (most times cooler) water the air is slowed down on the surface. There are two major environmental parameters which directly affect the amount of gradient; difference between water and air temperature and wind speed. Worse, there will even be turbulent air flow in extreme situations directly above the surface. If the difference between air and water temperature is big, and the wind speed is not too strong (usually below 6kn in 10m altitude), the effect is likely to be obvious. It usually is worst when the breeze starts to build after the sun is triggering the thermal lift ashore. If one says there is much wind gradient, this means the difference between mast head wind speed and wind speed on the surface is significant. On the other hand one says there is little wind gradient if the difference is small. As a result of the difference between wind speed on the bottom and on the top, there will be different apparent wind angles aloft and on deck. And apparent wind is finally the wind you sails are producing force with. You will experience problems
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