Re: Just general surfing stuff
Posted: Mon Aug 13, 2018 9:57 am
I assume its the same as the error margins for swell height and period as that is what its derived from
There's plenty more than one mistake in that little wrap-up. Reminds me of Dashiell Hammett's detective, reading a sign: "I was counting the number of lies in it, and had reached four, with promise of more"steve shearer wrote: ↑Mon Aug 13, 2018 5:03 amMagic Seaweed's blurb on NSW.
Can you spot the error Godsave?
"ABOUT NEW SOUTH WALES
New South Wales, home to Sydney and Byron Bay is an epicentre of world surfing. South-east facing, the coastline picks up any west swells and some north-easterly during summer, including the occasional cyclone swell. In the main south-east swells only arrive during the winter. Dominant winds are cross-shore from the south apart from in summer when it switches to the north. Byron is famed for its long sandy point and the region boasts a profusion of sandy beaches and reefs. Sydney is of course famed for city surfing at its many beaches. First surfed by Duke Kahanamoku in 1914 surfing is extremely popular with an estimated 350,000 surfers spread along its 750 mile coastline. Water temperatures vary from 19 to 25°C or 66 to 77°F."
Some set waves with 20' faces. I probably wouldn't go out. If I did I would be nervously and constantly scanning the horizon and paddling for it whenever I saw a distant shadow that might be the one hour set wave on its way.steve shearer wrote: ↑Mon Aug 13, 2018 12:25 pmCranked 8470 kj forecast for Lennox head next Monday.
any idea what that means?
No. Its about $80 return on a ferry, about an hour to get there. Then its 5k on a bus. Then its onshore so you catch the bus back and then the ferry then drive home.Trev wrote: ↑Mon Aug 13, 2018 9:31 amYou don't surf Rotness?Cranked wrote: ↑Mon Aug 13, 2018 9:26 amNo. Around Perth the offshore reef blocks most of the swell but the surf forecasts don't take this into account. I usually just convert the metres on the forecasts to feet, that is if the swell is 3m I'll assume its 3' faces.
Because of refraction around the reef gaps even a 3m swell is pretty much destroyed, especially as this phenomena increases with swell height. Consquently best swell size is under 2m as the smaller swells pass over the reef without too much interference.
The reef is the old drowned coastline, so its really consistent from about Dunsborough to Carnarvon. With a few gaps though.
I don't go down to Margaret River, north is too far. Its cheaper to go to Bali and the waves are way, way more consistent
Cranked wrote: ↑Mon Aug 13, 2018 4:02 pm200kJ - barely breaking, get out your log = 1 foot
500kJ - surfable, use your twinny = 2 foot
1000kJ - have fun on your small wave board = 3 foot
1500kJ - good overhead surf = 4 foot
2000kJ - really good head and a half, some doubles = 4-6 foot
2500kJ - consistently overhead, frequent doubles = 5-6 foot
3000kL - lots of doubles, some bigger = 6-8 foot
3500kJ - only the good surfers are out = 8-10 foot
4000kJ - I'm just watching = 10-12 foot
5000kJ - a lot more are watching, guys with guns are getting most of the waves = 12 foot plus
8000kJ - 9' gun = 15 foot
10,000kJ - 10' gun or a ski = 18 foot
15,000kj - skis only = 20 foot
In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton.Nick Carroll wrote: ↑Mon Aug 13, 2018 12:45 pmnah it's fine, 2000 calories? most of us would walk that off.
it is actually the thing that's been troubling me about all this fcuken Kilojoule talk though. What does it mean? Does it mean how much energy passes a certain point in a certain time? Does it mean the energy contained in some portion of a swell or wave as it travels or breaks over a certain amount of time?
Like kilojoule when applied to foodstuff is pretty clear, x amount of the foodstuff contains a potential energy availability of x kilojoules.
So what's the x in this? Swell trains aren't like that.
Yeah pretty good Hatchy.Hatchnam wrote: ↑Mon Aug 13, 2018 4:41 pmAm I getting the hang of it..?
Cranked wrote: ↑Mon Aug 13, 2018 4:02 pm200kJ - barely breaking, get out your log = 1 foot
500kJ - surfable, use your twinny = 2 foot
1000kJ - have fun on your small wave board = 3 foot
1500kJ - good overhead surf = 4 foot
2000kJ - really good head and a half, some doubles = 4-6 foot
2500kJ - consistently overhead, frequent doubles = 5-6 foot
3000kL - lots of doubles, some bigger = 6-8 foot
3500kJ - only the good surfers are out = 8-10 foot
4000kJ - I'm just watching = 10-12 foot
5000kJ - a lot more are watching, guys with guns are getting most of the waves = 12 foot plus
8000kJ - 9' gun = 15 foot
10,000kJ - 10' gun or a ski = 18 foot
15,000kj - skis only = 20 foot