Why do we worry about subtleties in shape and not empty fin boxes?

[griffinsurfboard]

I have trouble believing that you ever get an optimized thruster setup AND and optimized quad setup,

I have lots of photo examples of boards that work excellent in both setups .

Twin fin - Thruster combos as well .

 

[Clayster]

No, not dumb
Back to the question, nothing
Such a small area impossible to notice
If someone tells you the can feel , they're full of $#!t

If that is true, then all the deminimis differences between fins are irrelevant.

 

[griffinsurfboard]

If that is true, then all the deminimis differences between fins are irrelevant.

All Longboard riders know this is incorrect

 

[santacruzin]

I have lots of photo examples of boards that work excellent in both setups .

Twin fin - Thruster combos as well .

Truth! ridden my magic modfish with 3 configs. My inline tri with 3 different as well. They all work

 

[VaB]

I love the erbb!


finless board, no traction and no leash

this is the way

 

[need 4 speed]

If that is true, then all the deminimis differences between fins are irrelevant.

Disagree, de minimis in terms of fin (height,template,rake etc.) are actually important, not open holes in fin plugs.
Some real gems being posted, good fun

 

[paunch23]

This is straight BS!
The water/weight trapped occupying the box cavity will swing forward when you initiate the turn driving and adding propulsion into and out of your turn.
This water inertial engine, as we like to call it, will also add to launching each and every air higher and loftier than anyone else's airs, every-fucking-time.
For the layman, think about it like Free Energy. It's free so it gotta be good.

Kinda act like a “pendulum” right??
Like those the use on boats

 

[Mr J]

Kinda act like a “pendulum” right??
Like those the use on boats

Re water sloshing around in a partially filled taped over box cavity: No, I think Mr W AF is talking about Newton's conservation of momentum.

m1 u1 + m2 u2 = m1 v1 + m2 v2

Where:
m1 is mass of the surfboard
m2 is the mass of the trapped water in the box
u1 and u2 are the initial velocities and v1 and v2 are the final velocities of surfboard and trapped water.

So take the situation where water is in the front of the box eg. nose pointed down a wave when taking off. Then a sudden acceleration during the bottom turn would have the board travelling faster than the trapped water.
=> water slams into the back of the box.
=> board and trapped water end up travelling at the same speed.
So on the right hand side of the equation we have water speeded up and in order to balance the equation it means the board velocity gone down. So its not necessarily 100% positive as suggested by Mr AF, however that shouldn't detract from his brilliant advertising blurb.

PS what do you mean about boat pendulums? The self steering gear fitted on some sailboats? Aux Rudder vs Servo Pen | scanmar (scanmarinternational.com)

 

[Woke AF]

Re water sloshing around in a partially filled taped over box cavity: No, I think Mr W AF is talking about Newton's conservation of momentum.

m1 u1 + m2 u2 = m1 v1 + m2 v2

Where:
m1 is mass of the surfboard
m2 is the mass of the trapped water in the box
u1 and u2 are the initial velocities and v1 and v2 are the final velocities of surfboard and trapped water.

So take the situation where water is in the front of the box eg. nose pointed down a wave when taking off. Then a sudden acceleration during the bottom turn would have the board travelling faster than the trapped water.
=> water slams into the back of the box.
=> board and trapped water end up travelling at the same speed.
So on the right hand side of the equation we have water speeded up and in order to balance the equation it means the board velocity gone down. So its not necessarily 100% positive as suggested by Mr AF, however that shouldn't detract from his brilliant advertising blurb.

PS what do you mean about boat pendulums? The self steering gear fitted on some sailboats? Aux Rudder vs Servo Pen | scanmar (scanmarinternational.com)

this all may be true but does/did this Newton fellow surf?
and there lies the ultimate truth.

 

[manjushri]

What would Roy say

 

[Northern_Shores]

the box cavity