Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world. | |
Mast vibrating when berthing in marina |
Post Reply |
Author | |
Koppiekrou
Captain Joined: 21 February 2018 Location: The Netherlands Status: Offline Points: 185 |
Post Options
Thanks(0)
Posted: 22 April 2018 at 19:20 |
Hi all, I am not the first but when we are in the marina we feel some vibration. Not when the wind is blowing 30 knts but when it is blowing only 8 or 10 knts we sometime feel a vibration. It feels if someone is pulling the furler. Or Shakes the mast....?
Is it due to the selftaking system? Never had it when we owned boats with a genoa or high aspect... Feel free to give us some hints and if you feel this vibration also? Frank |
|
291 4Ever - 341 Eternal Flame and now a Hanse 371 '05 Karma - Shoal draft - 2 cabin - 40hp - Variprofile
|
|
Carlosailfan
Captain Joined: 06 March 2014 Location: Belgium Status: Offline Points: 193 |
Post Options
Thanks(0)
|
Hi, on my 385 I have a Zspar and the mast is also under the same conditions as you explain creation a vibration. I looked very carefully this weekend and is saw the mast shaking on top, the same direction as you tension the mast with the backstay. ( back to forward )
This is annoying me, it goes that bad that the owners bed during the night shakes. I will have to find a solution, this is not fun and at some moments the shaking goes that hard you hear the lines in the mast ticking and making noise. Any proposal is welcome, and of course dismasting is not an option . |
|
Best regards
/C |
|
Sea-U
Commadore Joined: 14 September 2012 Location: Norway Status: Offline Points: 459 |
Post Options
Thanks(0)
|
On my boat, I have some vibrations from the boom lift. Have thought of removing it as I hardly need it.
|
|
Sea-U is a 370e #532 located SW Norway
|
|
gshannon
Captain Joined: 16 April 2004 Location: BC Canada Status: Offline Points: 336 |
Post Options
Thanks(0)
|
Mast shaking can usually be stopped by applying some backstay tension. A mast with prebend shouldn't shake. Mine does not. However I get a "motorboat" sound from the topping lift in a crosswind. You can't hear it on deck, but it seems load down below. The cure for me was to attach a weight about 30 cm above the boom. I used one of these:
https://www.amazon.ca/Ferrite-Core-Cord-Noise-Suppressor/dp/B0002MQGEK It is made to suppress electrical noise, but works for this too!
Edited by gshannon - 23 April 2018 at 18:07 |
|
Grahame
Tangleberry 371-092 aviadesign.com |
|
Carlosailfan
Captain Joined: 06 March 2014 Location: Belgium Status: Offline Points: 193 |
Post Options
Thanks(0)
|
Hello Grahame,
thanks for the answer, i tried already what you proposed, some and even more tension on the backstay. There was only a small reduction of the shaking but far from a real solution. I think i need to check everything, tension and more of all gigging and then evaluate. thx ! |
|
Best regards
/C |
|
Koppiekrou
Captain Joined: 21 February 2018 Location: The Netherlands Status: Offline Points: 185 |
Post Options
Thanks(0)
|
Thanks Grahame, will try it with some weight before buying ferrite.
On Google you can find a lot of boat owners from different brands like Bene, Jeanneau, Dehler and so on with the same question. So it is not a typical Hanse item. |
|
291 4Ever - 341 Eternal Flame and now a Hanse 371 '05 Karma - Shoal draft - 2 cabin - 40hp - Variprofile
|
|
sailkoop
Commadore Joined: 02 September 2010 Location: Germany Status: Offline Points: 437 |
Post Options
Thanks(0)
|
Hello,
if can't bring enough tension on the Mast via the Backstay, check the Tension of the shrouds! If their is less tension, you can't achieve it alone over the backstay...
|
|
best regards
Bjoern |
|
Peter-Blake
Admiral of the Fleet Joined: 04 March 2008 Status: Offline Points: 2465 |
Post Options
Thanks(0)
|
Somehow a part of your rig is getting into its natural frequency or resonanz frequenz.....
This happens only in a special windrange. It is a common problem for any Mast or long round profile... Prebend of the mast is in my opinion not the solution, maybe only if you prebend it extreme.... The best way to stop the vibrating Mast or another part, is to hoist a fender close to the mast or the vibrating part. This will break the reason for the vibration. Looks weird but it works! |
|
Blake 370
|
|
Koppiekrou
Captain Joined: 21 February 2018 Location: The Netherlands Status: Offline Points: 185 |
Post Options
Thanks(0)
|
Our rigger told us to test the next: when the mast vibrates hoist a fender (like Peter-Blake wrote) and pull the lines hard. When the vibrating stops then you know is an idea to mount a radarlens like a trilens on the mast. This will have the same effect as the fender (and you have a good radarreflector mounted as an extra). After this the vibrating will never occur again.
Well it is worth trying. I will let you know if this is a sollution. |
|
291 4Ever - 341 Eternal Flame and now a Hanse 371 '05 Karma - Shoal draft - 2 cabin - 40hp - Variprofile
|
|
Post Reply | |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Links : www.hanseyachts.co.uk www.hanseyachts.com www.fjordboats.co.uk www.dehler.co.uk www.varianta.co.uk |