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Is foot strap position relative to fin size?
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grantmac017



Joined: 04 Aug 2016
Posts: 946

PostPosted: Wed Nov 09, 2016 2:10 am    Post subject: Is foot strap position relative to fin size? Reply with quote

Given the few recent threads on all things footstrap I'm curious if their position is relative to fin size/strength and/or board width?
My longboard occasionally tries to climb up on the fin and given its fairly narrow width plus round deck I prefer having the straps in the outward position.
My 80cm freeride board on the other hand I have to sail very light on the heel pressure even with a 50cm fin and straps inboard.

Thoughts appreciated.

-Grant
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Brian.bigfella@gmail.com



Joined: 11 Jun 2012
Posts: 127

PostPosted: Wed Nov 09, 2016 2:34 am    Post subject: Reply with quote

Yes.

A fun will lift towards the wind because of the drive of the water pushing against it. So it sort of tries to pivot from the board with the end pushing the upwind rail up. I think.

Anyway, the longer the fin the more force you need on the upwind rail to hold it down. The further outboard the straps are the easier that is. That's why formula boards have straps way out on the edge.
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isobars



Joined: 12 Dec 1999
Posts: 20935

PostPosted: Wed Nov 09, 2016 11:07 am    Post subject: Reply with quote

This doesn't answer your question directly, but it may help you resolve your issue as you venture into higher winds and terrain. It takes many sailors years to learn that those gigantic fins go with big boards and light winds (except for dedicated racerheds). I see one or two sailors every windy day trying to sail 80-90 L wave/B&J boards with 40 cm fins, who can't figure out why they get their butts handed to them in measly 25 mph winds.

Those concerns will disappear if and when you get the wind, equipment, desire, and skills to deliberately sail bumpier venues. The hassles you describe disappear in B&J/wave/freeride sailing powered up in winds averaging >20 mph and terrain big enough to PLAY WITH rather than just mash flat. With a 5.2 sail on an 80L board, fin lengths are in the low 20s (cm) and tail widths in the low 30s. Railing up doesn't exist even with single centered back straps.

Forewarned is forearmed.
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dllee



Joined: 03 Jul 2009
Posts: 5329
Location: East Bay

PostPosted: Wed Nov 09, 2016 12:45 pm    Post subject: Reply with quote

Fin size.
Rider weight.
Rider foot size.
What the rider intends to do.
Board width.
Board tail width.
Board bottom shape.
Board outline.
Underpowered, correctly powered, overpowered.
Water state.
Steadiness of the wind.
Mast track location.
And at least several other factors affect footstrap location and size.
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grantmac017



Joined: 04 Aug 2016
Posts: 946

PostPosted: Wed Nov 09, 2016 2:06 pm    Post subject: Reply with quote

Mike:
The conditions and equipment your describe happen maybe 3-4 times a year here, deliberately ignoring our prevailing conditions and the kit that works in them is not something I'm going to do. I'm sure eventually I'll pick up a sinker and start traveling to more adventurous places but that is a way off.

Zirtaeb:
Any chance of throwing out a few generalities?

This thread is (in addition to some education) because I've noticed that when I'm comfortably blasting my front foot tends to want to move out of the strap (inboard location) until it's on the position that it would be with the strap outboard. However my rear foot is definitely most comfortable inboard.

I currently have the rear straps one hole from the back and fronts one from the front in the inboard positions. I am finding that I sail with a lot of back foot pressure which I'd like to tune out. I'd also like to pick up as much efficiency as possible since we don't get a tonne of wind and I like going fast.

-Grant
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isobars



Joined: 12 Dec 1999
Posts: 20935

PostPosted: Wed Nov 09, 2016 2:30 pm    Post subject: Reply with quote

zirtaeb wrote:
Fin size.

And at least several other factors affect footstrap location and size.

Such as preference [Robby (Naish) goes big, (Ed) Angulo goes small ... unless they've changed their PREFERENCES] and skill level.
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grantmac017



Joined: 04 Aug 2016
Posts: 946

PostPosted: Thu Nov 10, 2016 12:59 am    Post subject: Reply with quote

isobars wrote:
zirtaeb wrote:
Fin size.

And at least several other factors affect footstrap location and size.

Such as preference [Robby (Naish) goes big, (Ed) Angulo goes small ... unless they've changed their PREFERENCES] and skill level.


You are back to talking sinker wave boards while I'm asking about low-wind freeride kit. Miles different.

-Grant
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willysp



Joined: 11 Jun 2013
Posts: 32
Location: Seattle, WA

PostPosted: Thu Nov 10, 2016 9:45 am    Post subject: Reply with quote

Hello,

http://jp-australia.com/2017/wp-content/uploads/2013/08/2017-User-Manual.pdf

Page 4 does not directly answer your question but gives you the basics of footstraps position.

Willy
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dllee



Joined: 03 Jul 2009
Posts: 5329
Location: East Bay

PostPosted: Thu Nov 10, 2016 12:27 pm    Post subject: Reply with quote

Grantmac...
Applies to all boards, including Formula and 12'4" Course Race longboards.
Where you stand, meaning footstrap position and size, including width, depends on a host of factors probably close to DOUBLE what I listed.
Like a car's accelerator pedal, or brake pedal, there are ENDLESS posibilities on pedal pressure and pedal percentage.
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sl55



Joined: 03 Aug 2007
Posts: 112

PostPosted: Thu Nov 10, 2016 1:00 pm    Post subject: Re: Is foot strap position relative to fin size? Reply with quote

grantmac017 wrote:

My 80cm freeride board on the other hand I have to sail very light on the heel pressure even with a 50cm fin and straps inboard.
-Grant


Grant, I know nothing about long boards. Well, I know they are long.
However, I am a superlight wind specialist.
I'll give you an example with a SB Ultrasonic board. It is a 147 L, 93cm wide board for light-wind planing. The board has two sets of foot-strap plugs- both pretty much out to the rails, one set is slightly more out than the other. I weigh about 190lb or 86kg naked and I am 6'4". With a 59 cm fin the board starts planing rather early, but after reaching about 23 mph becomes difficult to control and starts railing too much, lifting the windward rail no matter how hard I am trying to load the rail pushing with my heels down (foot straps all the way out) or loading the mast-foot. If I switch the fin to 55 cm, the board does not start planing as early, but remains easy to control blasting about 30 mph without any issues. I still have to keep pressure on the rail to prevent too much railing though.
We do not know what board you are on, how many foot straps positions it has, or what your weight is. If your board is not lifting the windward rail, it means that you don't have enough speed (not enough wind or your sail is too small for conditions; or your fin is too small for conditions, your weight, or sail size).
Experiment and draw your own conclusions.
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