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Humming/whining noise from the mast
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Topic: Humming/whining noise from the mast (Read 2086 times)
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Julian and Karen
Full Member
Posts: 16
Humming/whining noise from the mast
«
on:
11 Aug 2020, 20:15 »
This year our Baycruiser 23 has developed a much louder and more persistent whining noise that changes pitch as the wind/boat swings. Initially we thought this was the halyards so we moved them away from the mast and changed the tension but this made no difference. We then tried a cover for the forestay and a rope up the inside of the main track - no difference. We took the mast down to see if it was the wires for the vhf and the masthead light being too loose, we tightened them - no difference. My current thinking is that it is the windex/antenna which I can see vibrating but is this cause or effect - has anyone experienced this?
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Martijn
Sr. Member
Posts: 112
Re: Humming/whining noise from the mast
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Reply #1 on:
11 Aug 2020, 20:46 »
Are you sure it's the mast, not the shrouds?
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BC23 #54 "Riff Raff"
Julian and Karen
Full Member
Posts: 16
Re: Humming/whining noise from the mast
«
Reply #2 on:
16 Aug 2020, 22:11 »
We cannot be 100% sure - we also tried connecting the spinnaker halyard to the bow roller and taking the tension off the forestay – this did not stop the humming. From this we thought it was probably not one of the stays – as the forestay has the longest run without contact (the shrouds have the spreaders) and would therefore be most likely to vibrate. Our next attempt to stop it will probably be a change to the aerial (pointing it downwards without the Windex), unless anyone can recommend a different strategy.
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Graham W
Global Moderator
Demigod
Posts: 2502
Re: Humming/whining noise from the mast
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Reply #3 on:
16 Aug 2020, 22:24 »
It’s probably not relevant but the main source of humming in the wind on my BR20 is from the topping lift - both sides. Searching on Google shows that it’s the same for many other types of boat. I haven’t tried it yet but apparently the way to silence it is to release tension on the mainsheet so that the topping lift slackens a bit. Then the next noise will be the boom banging against the mizzen....
The Windex was also mentioned in passing as a possible source of noise but I couldn’t see a remedy.
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Graham
Gunter-rigged GRP BR20 #59 Turaco III
Matthew P
Hero Member
Posts: 552
Re: Humming/whining noise from the mast
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Reply #4 on:
17 Aug 2020, 09:26 »
Might vibration from the Windex, or aerial, be amplified by the mast? If so, changing the natural frequency of the mast or aerial might fix it - or make it at least hum a different tune.
Matthew
BR20 Gladys
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"Hilda", CLC Northeast[er], home build, epoxy ply, balanced lug
Previously "Tarika", BR17, yard built, epoxy-ply, gunter rigged
and "Gladys" BR20, GRP, gunter
Graham W
Global Moderator
Demigod
Posts: 2502
Re: Humming/whining noise from the mast
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Reply #5 on:
17 Aug 2020, 11:18 »
Put some rubber sheet between the Windex and its mounting point on the mast?
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Graham
Gunter-rigged GRP BR20 #59 Turaco III
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