If you get desperate you can suck it out bit by bit using your mouth

how cheap is cheap? if its too heavy I would just ditch the board. its too much mucking around especially if its just a cheap older board.

jord070 just been down this road, and its not good news. I set mine up to allow it to drain vent plug removed.
Unfortunately the core is like a sponge and soaks up the water, Place it out in sun on hot day helps evaporate content, and you can eventually get it all out doing it that way but its "months not days"
To check if it is leaking, place it on lawn from your shed, let it heat up for 5-10 minutes and then paint soapy water around vent plug (in and tight) and any other area's you may think are leaking. If its got a leak it will show bubbles with the air expansion escaping at leak point.
I fitted an old gym boot cotton shoe lace in the vent hole pushed it in with a knitting needle and let it be used like a wick on a candle, this also works to get some out. Check the weight in comparison to its spec weight and if its not much difference, you are at the stage of not gaining much more by faffing about. So big tip is, buy second hand, check with a wick to see if its got water in it before you part with your cash
Mineral

yeh good point mineral i was just thinking that maby if i even get an electric blanket and cover the board with that for a few dayas it may be able to get hot enouph to get the water to evaporade or maby get a bar heater in teh room with it aswell, that sounds pretty good and i will also try to get a vac pump and attach that for a few days and hope that gets the water going, what do ya think bout that idea

The weight was also about 7.3kg

Im not sure what you mean by being 1 litre over?
Having 1 1/2 litres of water in your board is alot? Is that possible?
Stand on some scales and weigh yourself. Then pick up your board and see how much the scales read. For example If you weigh 60kg you should get a reading of about 67.3kgs with board in hand?
My board weighed about 9kg and when I had wicked it i got it to weigh 7.5kg... and yes these boards do feel pretty heavy in the tail.
How much does the board weigh now Jord?

Hi,

I just got my JP FSW 84 down from 12 to 8kg and I tried quite a few ways. This is what worked for me:

Firstly, Wipe the board clean and put it in the sun (without the plug) so it becomes very warm all the way through. If you got water in it, the moist air will expand a lot and it will exit where you have holes and cracks. There are two ways to detect this, you'll either see water bubbling out or wou will see dried salt deposits where the cracks are(that is why you should wipe it clean first)

If you do find cracks, press to see if board is soft around the crack. If it is soft then you'll likely have to open up the board and dig out all crushed wet foam. If the board has gained a lot of weight this is most probably the case.

When the board is crack free and you want to get all the moisture out of it. Repeat this cycle until you are satisfied with the weight:
a) Put it in the sun to make it super warm all the way through. As the air inside the board heats up it can hold more water and it expands.
b) Put it in the shade to cool of. As it cools, air is sucked back in to it. The trick is to get really dry air sucked back in to it so that next time you put it in the sun, the air can absorb loads of water as it heats and expands. If you live in WA with low relative humidity just let it cool. If you live in NSW where it is humid you need to dry the air. I did it by letting letting the air be sucked through a tub with silica gel (recall the yellow or blue chrystals from chemistry in high school or see en.wikipedia.org/wiki/Silica_gel) You can also dry the air by cooling it before it enters the board as cool air don't hold as much water.
Repeat a..b until the weight is down.

quote:

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Originally posted by staffan

Hi,

I just got my JP FSW 84 down from 12 to 8kg and I tried quite a few ways. This is what worked for me:

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Staffan, that is an impressive gain, but you still have a little way to go. My JP FSW 84 weighs 6.3kg.

take the bung out sit it upside down.. maybe drill a couple of hole and stick it in a hot car
works a treat

well to answer all questions i figure that the board is 1 ltr of water because it wighs jsut over 8 kilos (aprox 8.4) i mesured out the wieght on an electric scale with a heavy bucket (wich is the +- 5%) and put it on my scales and marked it down so i know the exact area it should be on my scales. so i mesured the board it was jsut a lil over 8kg so if my thoughts are correct i kg = 1 ltr, i havent gone ahead with my electrc blanket idea because i cant find one, abd the way that steffan said was my first way aroudn it and i got about 1 ltre out as well, but if you wanna see my latest invwention of how to get water out i will post a topic to show a link on u tube after it finishes uploading, i think you will have a lauph but it is working

Didn't see the aquarium pump method mentioned. I guess its good if you have one, not so useful if you don't.

Someone (was it Jez) used to recommend using an old refrigerator motor as a vac pump.

Just thought of a modification that may make it quicker.
If you can fit a venturi to the holes at each end, they should suck air through the board, (from an open vent plug) assisting the spin process.

quote:

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Originally posted by jord070

decrepit, what is a venturi

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Haven't got a lot of time I've got to catch a plane.

But it's how a carburetter sucks petrol in from the float chamber.

It's a constriction in a big tube, (increases air flow) with a small pipe coming in at right angles, at the narrowest point of the constriction. The big tube lines up with your air flow, the small pipe connects to the holes at each end.
Try googling it, wikepeda should have better description and may be even some design rules.

You're going to find it difficult to get a significant air pressure difference just using a drill to get the board spinning...

Venturis are difficult to design at the best of times, let alone when they have to spin around attached by gaffer tape to a board!

Just as an aside, with the biggest air dam you can design on the front of a V8 Supercar doing 250 km/h down conrod straight, the biggest air pressure gain you can get is about 0.5 psi, compared to 14 psi normal air pressure. So that's 4% air pressure difference. Not really all that impressive.

And that's doing 250 km/h which I guarantee your board isn't doing! Bear in mind also that any work done by the venturi will slow down your drill, so a nice big low-speed venturi will undo all the work you've done on trying to make the board spin quickly.

You'd be much better off with a battery-powered blower blowing down into the vent plug.

Just my $0.02...

an old fridge compressor is ideal for a vac pump..just try and find one that is allready disconnected so you dont let the fridge gas escape and poke holes in the ozone layer ;)
be careful when you attach the suction end of the pump to the board to use a water trap of some sort in line perhaps a 2 litre water bottle (glass) and make sure you hava an inlet hole or the vent open so as not to collapse the board under too much vacumn.
and as mentioned earlier make sure the air being drawn thru the board is as dry as possible (pick a low humidity day or a hot tin shed to do it in)
another thing you could try is drawing the air thru the board via a jar of 'damp rid' first so the air travelling thru the board is 'laced' with the damp rid.
disclaimer- i havent tried the damp rid method but the vac pump method works.
good luck