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Thread: Board Design - Explain SetBack in detail Reply to Thread
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  Topic Review (Newest First)
05-27-2014 08:26 PM
ETM Everything mig said there is correct. Thanks mate ;-)

That design is a tough one to build for sure. To do the 3d stuff cost effectively you need to use a vacuum bag rather than a press which has its limitations as far as pressure goes. It probably wouldnt get the tail profile pressed down hard enough to conform to the mold shape.
I would say unless you are going to produce a cnc 3d top and bottom mold you will be struggling to get it to work.
05-27-2014 10:54 AM
Mig Fullbag
Quote:
Originally Posted by Big_Norwegian View Post
And there you kind of lost me again......
I thought you placed your inserts as "a pair" on your board....?
Meaning, you consider what normal stance width is, maybe 22", then you find center point on your effective edge and measure 11" to each side, and this is where you place your center inserts.
That's where ETM placed is most forward set of inserts for his front and back foot. Since he builds the boards for himself and knows his stance, he placed the most forward set of inserts on the front and rear pack centered on the effective edge.


Quote:
Originally Posted by Big_Norwegian View Post
If you have "The front set of inserts are centre of sidecut" that to me sounds like you are assuming a standard stance width and have placed the front inserts accordingly.
If you then move the back ones 8cm further back than what would be 'normal' you would potentially end up with a very wide stand.......?
Let's say his stance is 22". When he puts his bindings in the most forward set of inserts on the front and rear pack, his stance is centered. When he uses the middle set of inserts on the front and back pack, it gives him 4cm of setback. When he uses the rearest set of inserts on the front and back pack, it gives him 8cm of setback.

Quote:
Originally Posted by Big_Norwegian View Post
Your "weird-shape-flat-end-board" looks cool and I'm betting that looooong edge will feel awesome in groomers/hardpack. Though, not to criticize, I would expect the board to dive pretty fast in powder(especially crusty powder), even with rocker in the nose and set-back. It almost has the complete opposite nose compared to the Furberg board.
I think what ETM went for with that shape is a carver for groomers/hardpack that can still be ridden in softer snow and powder by setting is stance back. I don't think the goal was to make it a pow performer. It is the complete opposite of a Furberg, not just in the nose shape.

Quote:
Originally Posted by Big_Norwegian View Post
When it comes to the shape that I hope someone can build for me, it is not completely ready in terms of all specs, and my skills in 3D software are not good enough to draw it as per now (it's hard to make surface bend in 2 directions....). But I can try to explain;
It would be around 170+cm (for my weight) and have a long, pointy ("rocket shape") nose with reverse sidecut. But as the nose has "normal" rocker I wan't it to somewhat have "sideways" rocker as well, meaning the sides curve upwards.
I want mellow camber between bindings, magne traction along the edge.
For the tail I want it to be sort of a swallow tail (looking at it from above), like the Jones Hovercraft-ish, but I want the center 10-12cm (looking at it from behind) to curve upwards and hence create a "channel" that stretches maybe 20cm into the board along the board's direction (becoming shallower and shallower until it flattens out with the base of the board).

I know this is probably as demanding as a design gets, but I think that tail could kick ass
So you want a tail similar to the Völkl Selecta and a 3D convex nose similar to the TJ Brand boards. Should be a very cool board. I also have been working on a design that uses 3D profiles.
05-27-2014 10:16 AM
Big_Norwegian
Quote:
Originally Posted by ETM View Post
The marks on the base are centre of sidecut. The front set of inserts are centre of sidecut and the back ones are 8cm setback ;-)
And there you kind of lost me again......
I thought you placed your inserts as "a pair" on your board....?
Meaning, you consider what normal stance width is, maybe 22", then you find center point on your effective edge and measure 11" to each side, and this is where you place your center inserts.
If you have "The front set of inserts are centre of sidecut" that to me sounds like you are assuming a standard stance width and have placed the front inserts accordingly.
If you then move the back ones 8cm further back than what would be 'normal' you would potentially end up with a very wide stand.......?

Your "weird-shape-flat-end-board" looks cool and I'm betting that looooong edge will feel awesome in groomers/hardpack. Though, not to criticize, I would expect the board to dive pretty fast in powder(especially crusty powder), even with rocker in the nose and set-back. It almost has the complete opposite nose compared to the Furberg board.

When it comes to the shape that I hope someone can build for me, it is not completely ready in terms of all specs, and my skills in 3D software are not good enough to draw it as per now (it's hard to make surface bend in 2 directions....). But I can try to explain;
It would be around 170+cm (for my weight) and have a long, pointy ("rocket shape") nose with reverse sidecut. But as the nose has "normal" rocker I wan't it to somewhat have "sideways" rocker as well, meaning the sides curve upwards.
I want mellow camber between bindings, magne traction along the edge.
For the tail I want it to be sort of a swallow tail (looking at it from above), like the Jones Hovercraft-ish, but I want the center 10-12cm (looking at it from behind) to curve upwards and hence create a "channel" that stretches maybe 20cm into the board along the board's direction (becoming shallower and shallower until it flattens out with the base of the board).

I know this is probably as demanding as a design gets, but I think that tail could kick ass
05-23-2014 08:05 PM
ETM This pic is also a good illustration of what nose/tail/effective edge length can do to a shape, both boards have the front inserts at centre of sidecut yet they are drastically different to look at.
Specs on the left are 10-140-10=160 total and on the right 30-125-15 =170 total
05-23-2014 07:52 PM
ETM
Quote:
Originally Posted by Mig Fullbag View Post
That setback is what's really going to make it work in powder, not just the nose rocker...
Yes it will be interesting to see how it goes. I like to ride my boards centre of sidecut because I really enjoy holding a nice hard edge on the hard pack but most of my boards have more like 15cm tail and 30cm nose so they helps a lot in the pow.
This one being a full twin will highlight the effect of setback on a twin shape, I really hope I can just ride it centred though and enjoy maximum control of that massive edge.
05-23-2014 10:44 AM
Mig Fullbag
Quote:
Originally Posted by ETM View Post
The marks on the base are centre of sidecut. The front set of inserts are centre of sidecut and the back ones are 8cm setback ;-)
That setback is what's really going to make it work in powder, not just the nose rocker...
05-23-2014 10:44 AM
ETM
Quote:
Originally Posted by Mig Fullbag View Post
Big Norwegian: Post your shape! Interested in seeing it too and curious to find out what design features you are looking for that you have not found in other boards.

ETM: went through the entire thread on your boards several times before joining the forum. Beautiful creations! It was one of the deciding factors for me to join. Love your shapes. Outlines are somewhat similar to what I am doing.
Cheers man!
05-23-2014 10:40 AM
Mig Fullbag Big Norwegian: Post your shape! Interested in seeing it too and curious to find out what design features you are looking for that you have not found in other boards.

ETM: went through the entire thread on your boards several times before joining the forum. Beautiful creations! It was one of the deciding factors for me to join. Love your shapes. Outlines are somewhat similar to what I am doing.
05-23-2014 10:01 AM
ETM
Quote:
Originally Posted by Big_Norwegian View Post
I see it. And if I'm correct I also see that you have given that board some SETBACK
The marks on the base are centre of sidecut. The front set of inserts are centre of sidecut and the back ones are 8cm setback ;-)
05-23-2014 09:49 AM
ETM No problem at all mate.
I do it all myself in my garage ;-)
Post up your shape if you can, im interested, thats exactly why I started building. I wanted something I couldnt buy.
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