Wind unit positioning

[PeterV]

I’ve recently fitted a new NASA wireless wind to the mast, offset on the port side. First time out in 5 to 15 knots of breeze it all worked fine. Second time out in 25 knots plus it was fine on port tack but as soon as I came onto the starboard tack the speed indication dropped off to zero and looking up I could see the vane slowly rotating in circles. Obviously caused by the unit being in the lee or updraught off the mast. I assume if I set the unit so it’s more ahead of the mast than out to one side it should be better but has anyone else experienced this?

 

[Boathook]

My raymarine is mounted on the top of the mast but at the front. It can get wind shadow when the wind is from astern from the tri-light.

 

[[70521]]

It is usual to mount the instrumentation in front of the mast in 'clean' air.

I have a windex on the antenna that needs adjusting next time the mast is down as on the starboard tack it does impressions of 'rotary aircraft'.

 

[PeterV]

Thanks for the replies. I’ll nip up there and rotate it to the front next time I’m aboard.