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Rail Shape Opinions

 
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Uncle Grumpy



Joined: 15 Jan 2007
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Location: San Clemente

PostPosted: Wed Jun 29, 2011 5:24 pm    Post subject: Rail Shape Opinions Reply with quote

I put together this little blank with leftovers from another project.
2" thick X 43"X 19", roughly patterned after one of the Goddard templates.
Plan is two small keel fins near the rail.


I have my own opinions but I'd like to hear your input on rail shapes before I start to whackin' away at it.
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bgreen



Joined: 20 Feb 2004
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Location: Qld. Oz

PostPosted: Thu Jun 30, 2011 12:55 am    Post subject: Reply with quote

Uncle G,

My preference is for hard, squarish rails - just about the entire board length. Just a bit softer at the nose.

My fibreglass Goddard style board has really hard rails. I was taking my swim fins off on the sand one day & the board washed over my toe and made a 1/2"slice across the top of my toe.

Bob
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Uncle Grumpy



Joined: 15 Jan 2007
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Location: San Clemente

PostPosted: Thu Jun 30, 2011 8:52 am    Post subject: Reply with quote

You wouldn't happen to have an edge view photo of said board would you?
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Nels
Dolphin Glider


Joined: 13 Jan 2004
Posts: 340
Location: Ventura County, California

PostPosted: Thu Jun 30, 2011 9:17 am    Post subject: Reply with quote

My personal preference, based on a long-ago conversation with with my bodysurfing engineer borther-in-law that struck my common-sense bell a thunderous blow, is for hard release edges only in areas that can be transitions - waterlines.

I've seen recent photos of tail sections of contemporary surfboards that look to me much like skimboards...just turned down on top, or kind of boxy. And on the front, forward of where the outline starts to curve in to the nose, I like soft rails.

The "blank" looks great. How much do you think something like that is going to weigh? Mr.Mike, some of yours? Holiday weekend coming in the U.S......

Nels
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mrmike



Joined: 06 Sep 2007
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Location: coronado, ca

PostPosted: Thu Jun 30, 2011 9:38 am    Post subject: Reply with quote

my heaviest board come in @ 8 lb it is red oak my lightiest is just 3lb it is paulowine wood the oak board will out live me the other already has some creaks in it only 5lb apart Cool


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Uncle Grumpy



Joined: 15 Jan 2007
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Location: San Clemente

PostPosted: Thu Jun 30, 2011 10:15 am    Post subject: Reply with quote

Just weighed the raw blank and it's right at 5lbs.
I suspect, even with a heavy glass job and wood fins it will likely come in under 10.
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bgreen



Joined: 20 Feb 2004
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Location: Qld. Oz

PostPosted: Thu Jun 30, 2011 10:58 am    Post subject: Reply with quote

Uncle G,

I'm home next week so will take a photo as soon as I can. I prefer riding finless which also contributes to my preference.

Bob
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Uncle Grumpy



Joined: 15 Jan 2007
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Location: San Clemente

PostPosted: Thu Jun 30, 2011 11:28 am    Post subject: Reply with quote

Yeah, if you are goin' finless, thin rails are practically a necessity.
I'm going a different direction with this one tho'.
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Poobah
Dolphin Glider


Joined: 09 Jan 2004
Posts: 696
Location: California, San Diego

PostPosted: Thu Jun 30, 2011 6:19 pm    Post subject: Reply with quote

If it was me, I'd make it like a bellyboard version of a Hynson downrailer.

Disclaimer: Ya, I'm wierd.

Watch this video to see some serious experimentation with blunt rails. It's squatty pedestrian, but still very interesting. Riding a wave involves very complex math, and I think the factors W x F (the willingness to have fun) can sometimes overpower hydrodynamic inefficiencies:

http://www.youtube.com/watch?v=I0_yM1EKl9M
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rodndtube
Dolphin Glider


Joined: 06 Jan 2004
Posts: 690
Location: USA, MD, Baltimore

PostPosted: Thu Jun 30, 2011 9:41 pm    Post subject: Reply with quote

bgreen wrote:
Uncle G,

My preference is for hard, squarish rails - just about the entire board length. Just a bit softer at the nose.

My fibreglass Goddard style board has really hard rails. I was taking my swim fins off on the sand one day & the board washed over my toe and made a 1/2"slice across the top of my toe.

Bob

This:
http://mypaipoboards.org/pics/Rod_Austin09/austin_checkered_RPM-Bottom_stndng.jpg

http://mypaipoboards.org/pics/Rod_Austin09/MyPaiposBlondie.jpg

Not this, an experimental that Austin built right about the time he built my Orange Matter, the first paipo he ever built and the baseline design he uses -- the experimental was a real dog. Checkered RPM (above) uses the same template as Orange Matter but is a tad narrower and is thinner (more like 2" vs 2-1/2").
http://mypaipoboards.org/pics/Rod_Austin07/paipo4austin.jpg
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bgreen



Joined: 20 Feb 2004
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Location: Qld. Oz

PostPosted: Fri Jul 01, 2011 12:42 am    Post subject: Reply with quote

Poobah,

I like the idea of a W x F factor.

Bob
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ellis1973



Joined: 11 Jul 2011
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Location: Tynemouth, UK

PostPosted: Tue Jul 12, 2011 6:15 am    Post subject: Reply with quote

My rails are rounded like a surfboard. They are roughly 70/30. I tend to use fins but it still flyes without them its just a lot looser so you can do tricks Very Happy



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bgreen



Joined: 20 Feb 2004
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Location: Qld. Oz

PostPosted: Tue Jul 12, 2011 3:09 pm    Post subject: Reply with quote

I'd be interested to know the dimensions of your board and it's thickness. I'm considering getting a thinner version of a board I have and am interested in just how thin I can go.
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