To weak mainsail boom on the 47?
Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 461 / 470
Forum Description: 461 / 470 Hints and Tips
URL: https://www.myhanse.com/forum_posts.asp?TID=3527
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Topic: To weak mainsail boom on the 47?
Posted By: Timeout
Subject: To weak mainsail boom on the 47?
Date Posted: 29 December 2009 at 13:54
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A friend of mine broke his mainsail boom during a gybe in 16 knots wind, which should not be specially much. He thought that this was a little strange. After some investigation with Sparcraft he found out that the boom was under dimensioned. The boom was designed for a maximum 45 sqm mainsail. On the Hanse 47 the sailarea is 67,5 sqm (727 sq ft). It could be that Hanse is trying to save some money here....? The repair cost was about 10.000 euro by the way. He also found out that several other Hanse 47 have had the same accidents. He will know replace the boom with the right dimension according to Sparcraft. He will strongly advice to use a BoomBrake that basically adds a friction system to keep the boom from slamming over. Anyone else experienced any problems with the boom? ------------- Timeout Hanse 470e |
Replies:
Posted By: panos
Date Posted: 30 December 2009 at 09:41
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Hi, Boats with a center boom main sheet (like the 470) are vulnerable during violent jibes. Jibbing should be performed with great care. Unintended jibes can lead to boom brakes more often than boats with end boom sheeting. Building bomb proof rigs is not the answer (IMHO of course). There are boats in the market that are build heavier than the Hanse (Amel is the best example). Boats are not different to cars : Ferrari's, MB's and Grand Cherokee's are build for different users and all of them are very successful. ------------- Panos Hanse 630e - selling her - |
Posted By: Steen & Anne
Date Posted: 30 December 2009 at 11:18
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Hi.
I read an article about the new Xc42 from X-Yachts and the mast builder (John Mast DK) especially stressed out that it is nessesary to built a stronger boom for center boom main sheet control. That they have done for the Xc and not just mounted a std. boom from the X40/X43 and so should SparCraft and others. ------------- Former Hanse 342 owner - now racing a H-Boat |
Posted By: David Ericksson
Date Posted: 30 December 2009 at 17:32
My boom has also bent at the sheet point, see picture. And I have not made any yabes. Can anyone verify that it is underdimensioned, Sparcraft?  ------------- David Hanse 470, Prima Donna |
Posted By: Timeout
Date Posted: 30 December 2009 at 20:16
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Hi I'm not sure if he got the info from a Sparcraft dealer or from Sparcraft head office. But if this is true, I think Hanse is saving money on the wrong parts... It should not be so difficult to verify. And if this is the case, I would have tried to get this on the guarantee. Hanse should take the responsibility. This is also a matter of security. ------------- Timeout Hanse 470e |
Posted By: superliga
Date Posted: 31 December 2009 at 00:39
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@ David,
Your boom looks like it hit the standing rig or maybe the sheet was to loose ant the main part of the sail pressure was on the touch point on the standing rig? I'm no expert, but i would assume that a boom bended due to under-dimension alone would also point upwards and not only show horisontical damage. ------------- PEARL - S/Y SUPERLIGA - HANSE 470 e - Hull #168 - hanse470.com |
Posted By: superliga
Date Posted: 31 December 2009 at 00:46
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@ Timeout
When i gybe i always sheet the main in as far as i can before gybing. This reduce the distance and speed of the boom. If you don't do that you can breake any boom. Are you sure your friend sheeted before gybing? ------------- PEARL - S/Y SUPERLIGA - HANSE 470 e - Hull #168 - hanse470.com |
Posted By: panos
Date Posted: 31 December 2009 at 10:21
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@Pearl, You are right! Owners who upgrade to a big Hanse without some(?) racing experience face these difficulties. The Hanse boats carry a lot of canvas and in that respect they are racers. My 630 weights 25 tonnes and has an upwind sail area of 210m2 (with 100% jib) . This compairs with a Hallberg Rassy 54 with 26 tonnes and only 157m2 (with 100%jib) or 181m2 with a 140% genoa. It is obvious that the Hanse will be MUCH faster but also more delicate to handle. ------------- Panos Hanse 630e - selling her - |
Posted By: Gran Onada
Date Posted: 31 December 2009 at 10:42
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Don't you think in this case a boom brake is almost mandatory? ------------- Gran Onada IV - Hanse 350 #130 |
Posted By: Timeout
Date Posted: 31 December 2009 at 16:50
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I agree. I also always sheet the main in as far as i can before gybing. But we all have experienced uncontrolled gybes. 16 knots downwind should not be any problem concerning uncontrolled gybes. What is the facrt here is that Sparcraft say that the boom is dimensioned for 45 sqm sailarea and not 67. That is a huge difference. In the car industri the manufacturer would call all the cars back for an upgrade.
------------- Timeout Hanse 470e |
Posted By: Peter-Blake
Date Posted: 31 December 2009 at 17:36
The main on my 370 is about 43 sqm.
Do i need a boom from a Hanse 470 now?  ------------- Blake 370 
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Posted By: John Allison
Date Posted: 01 January 2010 at 19:09
If you want complete bullet proofing, how about the profile from the 630's?
Seriously, I know my profile is strong enough as we've done the time and distance to demonstate that. So suggest all should wait to hear if Hanse have reduced the Sparcraft section on the 470's (or any other models) before worrying about replacement spars.
And no reason why anyone needs to accept uncontrolled gybes. We sail on the edge when racing and have managed to avoid the situation. Surely when in cruise mode sailing safe angles is not too hard to do - and for sure if you worry about this, add a boom brake.
Whoever is asking the Q's from Hanse - please keep everyone posted on the answers.
JOHN ------------- No longer a Hanse owner - but loved the one we had! |
Peter-Blake wrote:Posted By: David Ericksson
Date Posted: 15 January 2010 at 22:17
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Hi Pearl,
I am race sailor since almost 40 years in dinghies and keelboats, so I am well aware of how to gybe. However since it is only me and my wife sailing this 470, i know every mile travelled and we have not gybed carelessly one single time. So I am keen to beleive that the boom is too weak ------------- David Hanse 470, Prima Donna |
Posted By: Timeout
Date Posted: 18 January 2010 at 10:18
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Hi David
Have you got any feedback from Hanse on this matter?
rgds
Timeout ------------- Timeout Hanse 470e |
Posted By: David Ericksson
Date Posted: 08 February 2010 at 17:07
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Hi,
No I have received OK from my insurance compnay to replace the boom
David ------------- David Hanse 470, Prima Donna |
Posted By: superliga
Date Posted: 09 February 2010 at 21:19
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David, thats nice to hear. Did the insurance survey the boom or did they just OK replacement. If they suveyed the boom it would be interesting to learn what they found. Are you getting a boom withe same dimension or are you going for a 630 boom?  ------------- PEARL - S/Y SUPERLIGA - HANSE 470 e - Hull #168 - hanse470.com |
Posted By: John Allison
Date Posted: 10 February 2010 at 19:28
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Just looking back at the picture and wondering again what may have caused this crease in the boom.
I see the crease is directly over the mainsheet attachment point.
As I am not sure that point on the boom could ever hit a stay I can't help but wonder if you've ever held the boom out on port gybe using a preventer from the boom end - and then hardened up on the mainsheet?
I know when most people rig a preventer to the boom end, and is obviously quite normal to then haul in the mainsheet tight, to stop the boom moving about.
But with a boom end preventer, and a mid boom sheet, the loads are being applied in different directions...........
Especially if the sheet was tightened up using a powered winch.
Just wonder if this has ever been done and if so, if it might be one possible cause of the weakness shown?
JOHN ------------- No longer a Hanse owner - but loved the one we had! |
Posted By: 371-#235
Date Posted: 11 February 2010 at 21:04
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Here is a result an uncontrolled jybe during 30+ knots of wind while single handed on my 371. The insurance company has approved a replacement.
The second pic is of last November when I delivered a J44 from Newport Rhode Island to Tortola by way of Bermuda. A boom brake was an integral part of our equipment (or kit as you Brits would call it).
Needless to say - I've ordered one for Blondie!
  ------------- Bob 371-#235 "Blondie" |
Posted By: Timeout
Date Posted: 12 February 2010 at 08:50
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Can anyone recommend a boom brake solution which is suitable for a 470? I think the solution on the picture does not fit a 65sqm mainsail? ------------- Timeout Hanse 470e |
Posted By: Peter-Blake
Date Posted: 12 February 2010 at 09:11
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@371#235 Just for my understanding: Did the boom hit the bb shroud in the uncontrolled jybe? It does not look like as the addidtional track for the sailcover does not show a hit What reef did you sail in 30+? ------------- Blake 370
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Posted By: Andreu Mateu
Date Posted: 13 May 2011 at 09:06
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My boom also bended... and I do not rember having done anything to it.. So ...no jib in stron winds.... One day I just realised it was bended in the port...
So with all your experience here......which is the rigth boom to put on the Hanse 470 ? I have to order one and I do not know which one,.. Thanks, ------------- Andreu Mateu Barcelona, Spain Owner of a Hanse 470e named "Kontrakorriente" amateu@dreamsandadventures.com www.kontrakorriente.weebly.com |
Posted By: pafburen
Date Posted: 30 May 2011 at 20:51
Which one is the right replacement.  ------------- pafburen |
Posted By: iemand
Date Posted: 01 June 2011 at 12:42
| the selden boom is much stiffer than the sparcraft however you wouldn't want a bulletproof boom since that will look totally sh*tty and is useless. |
Posted By: Niels
Date Posted: 01 June 2011 at 20:31
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Hi Iemand I have a Selden mast and Boom, I must say it looks the business, I am very pleased with Selden, I had an unplesant gype in 20 kn of wind the SELDEN boom took it on the chin no problem, however I have since added a gype brake that works wonders just to make sure it won't happen again. Regards Niels ------------- Niels |
Posted By: pafburen
Date Posted: 19 July 2011 at 07:57
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Hello
I broke my boom right off at the sheeting point. We were going down wind with full main in 20 knots wind. We were running the spinnaker and had flattened the main as much as possible. No gybe, nothing, it just snapped. It's definitely to weak, racing experience or not. But the New tube was only 1500 euro so not a big deal, apart from the work. ------------- pafburen |
Posted By: Terry
Date Posted: 19 July 2011 at 08:04
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which gybe brake did u get please. ------------- Terry "ELYSIUM" 430e |
Posted By: Niels
Date Posted: 19 July 2011 at 20:37
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Terry I bought a Walder 403 H have a look on Walders web site for sizing to your boat.All the best and good luck Niels ------------- Niels |
Posted By: Terry
Date Posted: 20 July 2011 at 10:04
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I will need the same, where did you buy it,online?! ------------- Terry "ELYSIUM" 430e |
Posted By: Niels
Date Posted: 20 July 2011 at 22:10
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Terry I bought it online from the company in France if I remember right no hassel at all. Regards Niels ------------- Niels |
Posted By: StephenDadour
Date Posted: 27 July 2011 at 08:18
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Hi, what size boom did you have.?
Regards Stephen
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Posted By: Niels
Date Posted: 28 July 2011 at 07:11
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My boom is a Selden cross section h250xw138 Regards Niels ------------- Niels |