RealSurf Surfers' Forum

jimmy wrote: ↑

Tue Jul 17, 2018 8:45 pm

How many joules?

Cranked wrote: ↑

Tue Jul 17, 2018 8:28 pm

Tomorrow is the day, supposedly.

Just got back from checking Ulus, perfect conditions, glassy, light warm offshore breeze, a lazy inconsistent but friendly looking long period swell. About 15 surfers scattered around, nymphs playing in the low tide pools as the sun sinks down behind the Java volcanoes.

Cranked wrote: ↑

Tue Jul 17, 2018 9:11 pm

jimmy wrote: ↑

Tue Jul 17, 2018 8:45 pm

How many joules?

Fcuk joules Jimmy, I've moved on to newton metres* now.


* One newton metre is equal to the torque resulting from a force of one newton applied perpendicularly to the end of a moment arm that is one metre long. I'm sure there's something in a newton meter for everyone, crabmeat in particular will find them irresistible

steve shearer wrote: ↑

Tue Jul 17, 2018 9:05 am

Judging from the engagement (reviews, photos etc etc) I'd estimate the global user base at around 20-50........probably euro kooks, probably the guys that designed it and built it and their friends and family.

Sorry Cranked this concept is even more still born than Surftechs.

ajohnsen wrote: ↑

Wed Jul 18, 2018 8:07 am

I thought Beanpole used litres to keep an eye on his daily scotch intake?

Hello,

I live in Belgium and i'm often looking on http://www.surf-forecast.com/ to see the places where i could go surfing. I was thinking to go to the netherlands. I'm still quite new to the sport. Most of the time the wave energy is under 100 Kj...
I don't have experience with this Unit so it's dificult to immagine how a wave of for example 70-80 Kj looks like or a wave of 200Kj.

I was thinking that maybe some of you have that experience by checking the forecast before a session

I think you are unnecessarily complicating your wave power assessment.
Tere is so much more to it than just Kjs.
here is a guide as i see it for beginners and covers most circumstance as a broad assessment.
First take swell size, (easy reading that) look at the period which represents the wave length of the swell these two things give you a general estimate of the power of the wave that will generated.
Short period means less power and most likely the swell has been created fairly close by.
Longer period means the swell is more organised more powerful and probably traveled further to get to your beach.
So a two metre swell on a 15 second period will be substantial in power, a one metre by 7second will be nowhere near as powerful.

Now comes the important bit, the bottom of the beach on which you wish to surf, starting at the Continental Shelf and offshore sandbank the swell begins to react an change itself accordingly.

At the point where the swell turns to waves is the most critical and gives the variance in wave types
Holland most often lacks wave power because the long gradually sloping offshore delta sandbank add frictions drag to slow and de-power the wave before it hits the shore line.
A deep water coast with an abrupt rise to the shore will generate a more powerful shore wave. Add further a choice of sand rocks or man made break creators.

Then throw in local and prevailing wind conditions and that is really the way to give yourself a chance of forecasting!

Get to know the beaches where you want to surf then apply the information above, the Kjs, newtons, foot pounds, any other power measurements are really only needed for a scientific assessment.

If you want to go the scientific way read Tony Butt's writings in the Stormrider guides or especially in in The Surfers Path Magazine, he is the best studied writer on this!.

Drailed wrote: ↑

Wed Jul 18, 2018 8:18 am

Cranked you can’t be serious with the kilojoules thing... surely

Thud wrote: ↑

Wed Jul 18, 2018 8:49 am

67 lites v 75 litres. Does it matter? Maybe it does.

Cranked wrote: ↑

Wed Jul 18, 2018 9:28 am

If you asked me the wave size here for today I don't know it despite checking the forecast last night and this morning.

But I do know the kJs and I would work that back to feet in my mind.