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#2895597 - 01/08/19 02:34 PM Re: Bottom contours and channels [Re: Greg Griffin]
Maz Online   content
Gerry Lopez status
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Registered: 05/18/04
Posts: 953
Loc: Innzid
Originally Posted By: Greg Griffin
Inset or not even you call it a double , because thats what it is .

Spiral Vee is from the 60's reborn by famous shapers later as double concave .

Part of the fun being around this for this long .

Be entertained by all this , it is pretty silly wave2



Exactly, so how would you differentiate between them?

I won't call both configurations double concave, because they are so different.

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#2895641 - 01/08/19 04:01 PM Re: Bottom contours and channels [Re: Maz]
sushipop Offline
Nep status
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Registered: 02/06/08
Posts: 638
Loc: The Dagobah System
Originally Posted By: Maz
Originally Posted By: Greg Griffin
Inset or not even you call it a double , because thats what it is .

Spiral Vee is from the 60's reborn by famous shapers later as double concave .

Part of the fun being around this for this long .

Be entertained by all this , it is pretty silly wave2



Exactly, so how would you differentiate between them?

I won't call both configurations double concave, because they are so different.

Logic is a super power.


Edited by sushipop (01/08/19 04:02 PM)
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#2895681 - 01/08/19 05:07 PM Re: Bottom contours and channels [Re: Maz]
Greg Griffin Offline
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Registered: 10/31/04
Posts: 18231
Loc: Palm Coast , Florida
"I won't call both configurations double concave, because they are so different."

You've been well programmed .

Both have Double Concave so Both are Double Concave .

One thing you should pay attention to is how these contour changes alter the release down the center of the board .
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#2895709 - 01/08/19 06:14 PM Re: Bottom contours and channels [Re: Greg Griffin]
Maz Online   content
Gerry Lopez status
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Registered: 05/18/04
Posts: 953
Loc: Innzid
Originally Posted By: Greg Griffin
"I won't call both configurations double concave, because they are so different."

You've been well programmed .

Both have Double Concave so Both are Double Concave .

One thing you should pay attetion to is how these contour changes alter the release down the center of the board .



FFS, GG.

It's got 5 eighths of fuq all to do with being 'programmed', but everything with trying to communicate clearly.

A ton of modern shortboards have what most call a single to double concave, maybe with a tiny vee out the very back. The double sits within the single, so that a straight edge across the board will touch both rails and not the stringer, until near the rear fin. That is NOT the bottom configuration I was describing.

That one is a single double with a pronounced vee through the back - from ahead of the fins. It does not track up the face like a modern single to double, but goes on rail much more easily. Some like the first type, others not. The point is, however, that they are very different.

A 1986 Ford Fairmont has 4 wheels, and a Ferrari F1 does too, yet they are - tadaaah! - not the same.

If you could please add some insight or clarification, then by all means contribute. If all you have is cryptic mumbling and insults, then don't.

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#2895760 - 01/08/19 07:57 PM Re: Bottom contours and channels [Re: patrolman]
YeahNo Offline
Grom

Registered: 01/20/17
Posts: 107
Loc: Kelly's Cove
Perhaps Pyzel and Scott Ando will chime in with their insight...

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#2895772 - 01/08/19 08:13 PM Re: Bottom contours and channels [Re: Maz]
Greg Griffin Offline
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Registered: 10/31/04
Posts: 18231
Loc: Palm Coast , Florida
Theres no shit talk in my response .

Nothing Cryptic either .

Raise the center spine and it will be freer and go rail to rail better .

Again be aware of how these changes in bottom shape effect the release thru the center , many reduce that and causes problems at higher speed .


1969-70

These Brewers had Spiral Vee - slight roll forward tapering to Vee in the tail
Wide circle spinning down to a very small circle = Vee





At the same time Most of Diffs boards had double concaves in the tail , He did not call it Spiral Vee




I borrowed 1 of each to ride at Waddel creek to compare - great fun , no one out .

The Brewer was more lively






Bye wave2
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#2897322 - 01/12/19 04:47 PM Re: Bottom contours and channels [Re: patrolman]
patrolman Offline
Miki Dora status
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Registered: 07/28/05
Posts: 4262
Ok let's get back to channels and off the history of the term spiral vee debate.

Parallel to stringer or toed? What's the difference?

Also, I imagine a deeper channels, kind of squared, to act sort of like long, low fins, redirecting water. Drive.

Shallow, rounded channels, on the other hand, seem to me like they will only disturb water and maybe make the tail looser because of turbulance?

Anyone can confirm or deny my ruminations?

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#2897342 - 01/12/19 07:15 PM Re: Bottom contours and channels [Re: patrolman]
Greg Griffin Offline
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Registered: 10/31/04
Posts: 18231
Loc: Palm Coast , Florida
Good Luck
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#2897353 - 01/12/19 08:14 PM Re: Bottom contours and channels [Re: patrolman]
SlicedFeet Offline
Miki Dora status
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Registered: 12/16/04
Posts: 3873
Loc: Swarm Diego
Originally Posted By: patrolman
Ok let's get back to channels and off the history of the term spiral vee debate.

Parallel to stringer or toed? What's the difference?

Also, I imagine a deeper channels, kind of squared, to act sort of like long, low fins, redirecting water. Drive.

Shallow, rounded channels, on the other hand, seem to me like they will only disturb water and maybe make the tail looser because of turbulance?

Anyone can confirm or deny my ruminations?


Youre not mentioning a very important aspect when it comes to channels. Release. Do you want it to? I think that should be consideration No.1.
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#2897383 - 01/12/19 10:20 PM Re: Bottom contours and channels [Re: SlicedFeet]
need 4 speed Online   content
Miki Dora status
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Registered: 11/01/03
Posts: 4354
Loc: SoCal
Are you saying a board with channels won't release or one of those paticular types of channels won't release ?
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NOT THAT KIND

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#2897392 - 01/12/19 10:46 PM Re: Bottom contours and channels [Re: need 4 speed]
Maz Online   content
Gerry Lopez status
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Registered: 05/18/04
Posts: 953
Loc: Innzid
Originally Posted By: need 4 speed
Are you saying a board with channels won't release or one of those paticular types of channels won't release ?


The ones I've ridden release perfectly well. Just like you can get fine release on a board with large fins.

Very curious to hear more about toed in channels from those of you more in the know. The idea totally makes sense to me, but I've yet to try it.

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#2897395 - 01/12/19 10:53 PM Re: Bottom contours and channels [Re: need 4 speed]
SlicedFeet Offline
Miki Dora status
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Registered: 12/16/04
Posts: 3873
Loc: Swarm Diego
Originally Posted By: need 4 speed
Are you saying a board with channels won't release or one of those paticular types of channels won't release ?


I think that the whole design really needs thoughtout before hand.

Not trying to echo GG but throwing channels in a regualr board and the normal fins, I think most would think its way overfinned.
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#2897397 - 01/12/19 11:03 PM Re: Bottom contours and channels [Re: SlicedFeet]
Maz Online   content
Gerry Lopez status
*

Registered: 05/18/04
Posts: 953
Loc: Innzid
Originally Posted By: SlicedFeet
Originally Posted By: need 4 speed
Are you saying a board with channels won't release or one of those paticular types of channels won't release ?


I think that the whole design really needs thoughtout before hand.

Not trying to echo GG but throwing channels in a regualr board and the normal fins, I think most would think its way overfinned.


Absolutely. Agree completely.

The fins that came with my Byrning Spears are tiny:

https://shapers.com.au/carbon-core-ab01/

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#2897408 - 01/13/19 12:11 AM Re: Bottom contours and channels [Re: Maz]
need 4 speed Online   content
Miki Dora status
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Registered: 11/01/03
Posts: 4354
Loc: SoCal
I have been able to reduce fin size when
I ordered boards with channels.
They seemed like a good idea for my twinzers
Maybe aid in projection
I like the way they look
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#2897460 - 01/13/19 09:44 AM Re: Bottom contours and channels [Re: need 4 speed]
Greg Griffin Offline
Duke status
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Registered: 10/31/04
Posts: 18231
Loc: Palm Coast , Florida
Custom fins made for this :



Making 15 more today .
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