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Old 20-08-2016, 10:15   #961
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Re: Bestevaer 49ST

Double the fun, doublemint gum!
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Old 20-08-2016, 10:15   #962
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Re: Bestevaer 49ST

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Originally Posted by weavis View Post
Still waiting to see the other hull...
They are living in the other hull

From what I understand, they have 2 more hulls than you have
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Old 20-08-2016, 10:16   #963
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Re: Bestevaer 49ST

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Originally Posted by hoppy View Post
They are living in the other hull

From what I understand, they have 2 more hulls than you have
er... no. BUt I dont have one here...
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Old 20-08-2016, 11:19   #964
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Re: Bestevaer 49ST

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Originally Posted by HappyMdRSailor View Post
And Inquiring minds want to know how big your solar breakers/(fusing) are???

80A
40A
30A
???

From solar...
Not sure yet. They will be Merlin Gerin industrial double poled circuit breakers such as this, fitted on a common DIN rail system:




This is not as pretty as an engraved marine circuit breaker panel, but it makes the circuit breakers very easy to replace or to add new ones later as needed. My resident electrician hates the modern trend of yachts having only a few circuit breakers. The wiring gets messy and future additions are hard.

Our board will back directly into the technical area/worshop adjacent to the engine bay, making wiring simple.


Here is photo from KM's website of another of their boat's showing that the type of panel we have in mind has been installed before. Our panel will be significantly larger though:
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Old 20-08-2016, 11:21   #965
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Re: Bestevaer 49ST

Looks like there will be lot of single circuits going to the bus board...
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Old 22-08-2016, 09:52   #966
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Re: Bestevaer 49ST

Our rudder construction is well underway.

"Beefy" was our simple requirement, above and beyond KM's usual level of ruggedness. The shaft diameter is 130mm. The central panel that you can see here is only 5mm thick, but the rudder skins will be two sheets of 8mm alu:






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Old 22-08-2016, 10:36   #967
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Re: Bestevaer 49ST

So the rudder will be a combination of stainless steel and aluminum.

Do you know how they weld stainless to aluminum? I would think that it would be difficult due to the differing temperature limits of the two materials.

I know nothing about welding
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Old 22-08-2016, 10:43   #968
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Re: Bestevaer 49ST

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So the rudder will be a combination of stainless steel and aluminum.

Do you know how they weld stainless to aluminum? I would think that it would be difficult due to the differing temperature limits of the two materials.

I know nothing about welding
No stainless steel. It is all aluminium .

SWL
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Old 22-08-2016, 13:46   #969
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Re: Bestevaer 49ST

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No stainless steel. It is all aluminium .

SWL
Well, that's pretty cool!
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Old 22-08-2016, 14:13   #970
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Re: Bestevaer 49ST

Quote:
Originally Posted by Seaworthy Lass View Post
No stainless steel. It is all aluminium .

SWL
Indeed. I had my grubby hands on that rudder shaft a couple of days ago, and it is an absolutely gorgeous piece of machined billet. Work of art. I absolutely love the way they machined the sides off it to make it fit inside the airfoil.


I was surprised at how small it was, however. Maybe full spades are so effective that more area is not needed? It is about 1/4 of the area of the rudder on my boat, although the displacement is similar. Also, the shaft is offset really far so that very little of the rudder area is ahead of the shaft axis, so there will be very little servo effect. What is the idea behind that? Wouldn't make any difference to the hydrodynamics I guess.
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Old 22-08-2016, 15:18   #971
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Re: Bestevaer 49ST

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Indeed. I had my grubby hands on that rudder shaft a couple of days ago, and it is an absolutely gorgeous piece of machined billet. Work of art. I absolutely love the way they machined the sides off it to make it fit inside the airfoil.


I was surprised at how small it was, however. Maybe full spades are so effective that more area is not needed? It is about 1/4 of the area of the rudder on my boat, although the displacement is similar. Also, the shaft is offset really far so that very little of the rudder area is ahead of the shaft axis, so there will be very little servo effect. What is the idea behind that? Wouldn't make any difference to the hydrodynamics I guess.
Also, the shaft is offset really far so that very little of the rudder area is ahead of the shaft axis, so there will be very little servo effect. What is the idea behind that? Wouldn't make any difference to the hydrodynamics I guess.

It appears to be appropriate for what would be considered a semi-balanced rudder. Were a greater portion of the rudder extended forward of the post, while you might achieve a sort of power steering, you are reducing the hydrodynamic qualities of the rudder. Same as oversteering or oversheeting.

What surprised me was that I had surmised the post as 130mm in stainless, as SWLass had said they oversized the rudder post. Why not 160mm if in aluminum? I am sure that the numbers have been run though and all is correct. Need something in the pic to give perspective.

Isn't it fun to be sidewalk supervisors for someone else's boat?

It is a massive hunk of machined metal.
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Old 22-08-2016, 15:58   #972
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Re: Bestevaer 49ST

Quote:
Originally Posted by Dockhead View Post
Indeed. I had my grubby hands on that rudder shaft a couple of days ago, and it is an absolutely gorgeous piece of machined billet. Work of art. I absolutely love the way they machined the sides off it to make it fit inside the airfoil.


I was surprised at how small it was, however. Maybe full spades are so effective that more area is not needed? It is about 1/4 of the area of the rudder on my boat, although the displacement is similar. Also, the shaft is offset really far so that very little of the rudder area is ahead of the shaft axis, so there will be very little servo effect. What is the idea behind that? Wouldn't make any difference to the hydrodynamics I guess.
Just doing a little reading. From what I can find, a high aspect "balanced" rudder has from 15-17% of the blade area forward.

I will do some measurements from the cutting files and check what ours is.

SWL
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Old 22-08-2016, 16:17   #973
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Re: Bestevaer 49ST

Quote:
Originally Posted by Seaworthy Lass View Post
Just doing a little reading. From what I can find, a high aspect "balanced" rudder has from 15-17% of the blade area forward.

I will do some measurements from the cutting files and check what ours is.

SWL
Ah, so little? I'm just not so familiar with spade rudders. I suppose my rudder (semi-balanced partial skeg rudder) has about that much ahead of the shaft, but because of the partial skeg, it looks different.

Yours is not a "high aspect" rudder, by the way -- it's quite moderate. And I think that's just right -- moderate aspect airfoils will be more resistant to stalling, and the construction will be stronger. You can afford a bit of extra drag for those qualities, I think.

But why is it so small? It's even smaller than the rudder on my previous boat, a 37' Pearson. Maybe it's for drying out? Most of these have lifting keels I believe.

By the way, here is your rudder, with my hand in the photo for scale


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Old 22-08-2016, 17:03   #974
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Re: Bestevaer 49ST

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Ah, so little? I'm just not so familiar with spade rudders. I suppose my rudder (semi-balanced partial skeg rudder) has about that much ahead of the shaft, but because of the partial skeg, it looks different.

Yours is not a "high aspect" rudder, by the way -- it's quite moderate. And I think that's just right -- moderate aspect airfoils will be more resistant to stalling, and the construction will be stronger. You can afford a bit of extra drag for those qualities, I think.
It took a while to do it accurately, as the shape is complicated. I get 15.1%, which seems about right.
Ours is the 26th Bestevaer and they have made a couple of Bestevaer 49STs before ours, so hopefully the proportions are correct. I guess we will find out when she is launched .

Quote:
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But why is it so small? It's even smaller than the rudder on my previous boat, a 37' Pearson. Maybe it's for drying out? Most of these have lifting keels I believe.
Size wise, I am not sure. It does not look small compared to our current rudder proportion and the boat size is similar. I doubt drying has been taken into account, performance is a high priority with these boats.

They have done a few Bestevaers with lifting keels (eg the new Pure), but not many. Dijkstra's original design was fixed.

SWL
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Old 22-08-2016, 17:18   #975
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Re: Bestevaer 49ST

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Most of these have lifting keels I believe.
The number with lifting keels is higher than I thought (most I've seen have been fixed). I have just checked KM's website and 11 of the 26 are lifting on Bestevaers.
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