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I have to build a new one.

 

While I am seriously tempted to take a mold off the old one as it is a very chatty blade does anyone know of anything new, interesting, in R&D or of interest for someone looking at that specific subject?

 

 

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Lovin the sexy shape, it's far flasher than my basic rectangle.

 

I just staked a couple of other boats and we have similar but I think mines quite chunky. I have some measurements to play with tonite.

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Wowww, those are either super sexy or someone needs to stop running into whales :)

 

What's the thinking behind those blades Sloop, any idea?

 

 

Tims would be a bit short I'd expect Scottie. My rudder draws only 300mm odd less than my keel.

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apparently

 

The flippers of the humpback whale channel flow and increase aerodynamic efficiency due to tubercles or bumps

 

humpbackwhale_feature.jpg

 

http://www.asknature.org/strategy/3f2fb504a0cd000eae85d5dcc4915dd4help

 

that's the best guess anyway

 

seem to remember their sizing and placement must be correct for a set speed or the faint advantage becomes a faint disadvantage

 

since we're talking fluid dynamics

 

splash-demotivational-poster-1249155045.

 

not sure even God knows exactly what's going on

 

but don't tell him i said that

 

which is why they are never? seen on race winners, only the pretenders

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Not too sure how fast that last sexy looking rudder would be .......... but then if I had that strapped on the back would I care? I think knot ;)

 

 

Tubercles, hmmmm.... I do occasionally get cavitation ...... Not much and usually straight after a oppsie.

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You will need a wet towel over the head for this....... :wtf:  :wtf:

 

http://dspace.mit.edu/bitstream/handle/1721.1/42917/245535660-MIT.pdf?sequence=2

Gezzz but a quick suss looks very interesting and it has a lot to do with foil shapes. I'll print it and have a read tomorrow. I can't read techo stuff like that well on screens.

 

Thanks Sloop.

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In theory the Tubercles allow higher angles without stalling so you could run a narrower section without stalling all adds up to less drag all the time.

Not sure about some of those profiles always thought that the best shapes had a continuous taper towards the bottom to keep the flow attached, that said any of the modern profiles would be a huge improvement over the old rectangle of the past.

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Hey KM. Have a talk to Paul Stock who built the emergency rudder for the Marshall. He reckoned the section he had would be ideal for a 930, and he has all the moulds.. I will PM you his email address..

I'd insert a pic, but can't work this new crew system....

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I wonder what they are changing to Erice? Willow is right though, I'm hung ..... transom is about all I can claim hung on though ;)

 

Probably a little small FLC. The 930's are quite large for the boat.

 

A spade, na I don't think that would improve much. The existing is chatty and will tell me quickly if I'm pushing something too far .... or not enough. But due to a oppys before I got her, there was a super high speed rudder replacement so it's built a light but heavy.

 

Smithys spare was damn close in size and shape from memory so if Paul has a mold....... I'll suss.

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