Humming from the centreboard

   We have just launched our rebuilt Hartley 16 trailer sailer and we sailed it yesterday, however we keep getting a humming noise coming from the centreboard case. We have a 10mm steel plate for our centreboard. 
Can anyone tell me why it is humming? It must be causing vibration and turbulance as I can feel it slightly in the rudder so it must be slow - can anyone confirm that and advise me as to how I can get rid of the humming? Many thanks.

Edited by turquoise sea

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turquoise sea Send Private Message Find Member's Posts Newbie Joined: 22 Mar 09 Location: New Zealand Online Status: Offline Posts: 2	Post Options Post Reply Quote turquoise sea Report Post Quote Reply Topic: Humming from the centreboard Posted: 22 Mar 09 at 10:58pm
	We have just launched our rebuilt Hartley 16 trailer sailer and we sailed it yesterday, however we keep getting a humming noise coming from the centreboard case. We have a 10mm steel plate for our centreboard. Can anyone tell me why it is humming? It must be causing vibration and turbulance as I can feel it slightly in the rudder so it must be slow - can anyone confirm that and advise me as to how I can get rid of the humming? Many thanks. Edited by turquoise sea

tmoore Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 01 Nov 07 Location: Wales Online Status: Offline Posts: 880	Post Options Post Reply Quote tmoore Report Post Quote Reply Posted: 22 Mar 09 at 11:06pm
	Check the back edge of both boards. If they are dinked or quite blunt then by sanding them to make a slightly thinner trailing edge it will probably get rid of it. It may also be worth checking they both fit tightly in the cases.
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Guests Send Private Message Find Member's Posts Guest Group	Post Options Post Reply Quote Guests Quote Reply Posted: 22 Mar 09 at 11:07pm
	The normal answer is the file down the trailing edge of the board. That might be a little difficult in your case as you've got a steel plate.

A Seabadger Send Private Message Find Member's Posts Far too distracted from work Joined: 11 Oct 05 Location: United Kingdom Online Status: Offline Posts: 222	Post Options Post Reply Quote A Seabadger Report Post Quote Reply Posted: 23 Mar 09 at 5:00pm
	It's humming coz it's happy to be back on the water!!
	I don't suffer from insanity...I enjoy every moment of it.

G.R.F. Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028	Post Options Post Reply Quote G.R.F. Report Post Quote Reply Posted: 23 Mar 09 at 5:17pm
	Just rub down one edge of it, 45 degrees that will cure it. The trailing edge that is.
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tmoore Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 01 Nov 07 Location: Wales Online Status: Offline Posts: 880	Post Options Post Reply Quote tmoore Report Post Quote Reply Posted: 23 Mar 09 at 9:07pm
	i would blame the crew personally.
	Landlocked in Africa RS300 - 410 Firefly F517 - Nutshell Micro Magic RC yacht - Eclipse

turquoise sea Send Private Message Find Member's Posts Newbie Joined: 22 Mar 09 Location: New Zealand Online Status: Offline Posts: 2	Post Options Post Reply Quote turquoise sea Report Post Quote Reply Posted: 24 Mar 09 at 12:51am
	We have a blunt edge for our trailing edge, maybe we'll try making it to a 45 degree angle. The humming seems to go when we lift the plate slightly, perhaps it shouldn't have to go all the way down. Ah well, looks like lots of boat tuning for us over the winter.

Status Send Private Message Find Member's Posts Posting king Joined: 10 Nov 08 Location: United Kingdom Online Status: Offline Posts: 114	Post Options Post Reply Quote Status Report Post Quote Reply Posted: 24 Mar 09 at 8:39am
	It's supposed to be spring now, doesn't feel like it today though!
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Medway Maniac Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788	Post Options Post Reply Quote Medway Maniac Report Post Quote Reply Posted: 24 Mar 09 at 11:17am
	Sometimes simply packing to eliminate any sideways movement (e.g. strips of laminate glued in the plate case or on the plate) can stop the vibration establishing itself. The fact that you can stop it by partially raising the plate might suggest packing would be enough (assuming it's easier than filing - will you be removing galvanizing by doing that?)
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