B&G instruments

[Bluesquirrel]

Hi just bought a new sailing boat, which is equiped with B&G wind and B&G Quad instruments. (Similar to these

and

)

The wind instrument is marking the boat speed (as the quad system) and not the true wind speed.. Even when the instrument is set to indicate the true wind speed, it still shows the boat speed.

Do you know what i might be doing wrong in setting the instruments pls ?

Thanks

 

[sarabande]

the B&G manuals are all here

http://www.bandg.co.uk/en-gb/Support/User-Manuals/

If you have tried all the settings, I suppose that there is no remote possibility that the input is wrongly connected to the log , somehow ?

 

[reeac]

Re: B&G instruments

Your illustration shows the instrument displaying speed in knots i.e. log speed whereas the instruments will need SOG data from your GPS in order to calculate true wind speed. Just for clarification, have you got the GPS switched on and if so does the SOG that it displays agree with the apparent wind speed under windless conditions[if such conditions are available]? It would be worthwhile to check the accuracy of the wind instrument by motoring upwind and then downwind, noting wind readings and SOGs.

 

[alan]

I think the apparent wind speed is obtained from calculation using the true wind speed (from the wind instrument anemometer) and the boat speed (from the log).
Could it be that the anomometer is not working and you are simply displaying boat speed X cosine zero?

I used to have B&G instruments and they had some basic fault finding instructions on their web site for trying to help with deciding if transducer or instrument was faulty .............. IIRC for the log you could touch two wires together to simulate pulses from the log wheel magnet ............. can't remember for the anemometer though! But have a look at their web site it used to be helpful.

Alan.

Alan.

 

[Paprikachu]

Re: B&G instruments

[ QUOTE ]
the instruments will need SOG data from your GPS in order to calculate true wind speed.

[/ QUOTE ]

Actually, the true wind is calculated from the apparent wind (speed and direction) and speed over water.. Only reason for this is that calculating true wind from an NMEA input wouldn't be correct due to lack of speed and lag in GPS NMEA data.

The B&G wind instrument isn't made and can't display Speed over water. The speed you see on the display is actually the result from the calculation (speed over water/ apparent wind speed) I'd suggest taking a look at your apparent wind speed. Is it correct?


/forums/images/graemlins/grin.gif oops, didn't read alan's post yet.. sorry but he's right

 

[reeac]

Re: B&G instruments

[ QUOTE ]
[ QUOTE ]
the instruments will need SOG data from your GPS in order to calculate true wind speed.

[/ QUOTE ]

Actually, the true wind is calculated from the apparent wind (speed and direction) and speed over water.. Only reason for this is that calculating true wind from an NMEA input wouldn't be correct due to lack of speed and lag in GPS NMEA data.

The B&G wind instrument isn't made and can't display Speed over water. The speed you see on the display is actually the result from the calculation (speed over water/ apparent wind speed) I'd suggest taking a look at your apparent wind speed. Is it correct?


/forums/images/graemlins/grin.gif oops, didn't read alan's post yet.. sorry but he's right

[/ QUOTE ]

I'm surprised to hear that. Next time I'm on my boat I'll see if I can get true wind speed with the GPS off which would prove that it's using the paddle wheel data. I could also withdraw the paddle wheel but have the GPS on and see what that yields.