[Closed] engineers/slackliners: my wife wants a slackline, how deep to sink the posts?

Not a Stanton Slackline then...

I have set one up using two pieces of 2x4 holding the slackline off the ground, tensioned against two pieces of 50 cm angle iron at each end.

That worked fine. Hope that helps!

My first thought was that a Stanton Slackline was going to be something dreadful from [url= http://www.urbandictionary.com/ ]urban dictionary[/url]. A relieved no - she rides a '94 Explosif with all the period sweetness and is happy with it for sure!

Thanks Dave, a much simpler way of doing it! Ground anchors and temporary uprights, hmmm... (and as you may have guessed, this is her thing, not mine and I don't have any clues except those the web has priovided!

trickiest bit is making sure that the line is stable. Bit of playing around and should be good.

I want it to be safe, that's the priority. I'm thinking [b]5" oak posts[/b], [b]four feet underground[/b] and no concrete. And when I say thinking, I mean guessing. Any advice?

sounds about right to me.

this sort of thing is very hard to calculate from first principles.

there are some building standards and that sort of thing which may help, but the answer they provide will depend on things like soil type, etc.

the tension forces on a slackline are huge, how about using 5" posts, buried 4ft into the ground?

if that doesn't work, plant 2 oak trees, and wait 50 years...

Does that mean that fixed posts would allow for an easier setup, for example if she wants it up for just a half hour in the evening after work?

Also, I'm assuming you dont actually go right to the end of the line? Guess I need to watch some beginners youTube videos to see what goes on!

Edit: Thanks ahwiles! A grey clay from 2ft down here, said with some confidence as we've just had people looking at the house foundations reference an extension! Though a tree complicates things...

[url= http://www.maverickslacklines.co.uk/products/ ]Try here.[/url]

[url= http://www.maverickslacklines.co.uk/no-trees-set-up/ ]No tree set up[/url]

I'm a fencing contractor that specializes in high tensile fencing, so we quite a bit of pressure on the end posts. I would suggest digging as far down as you can go and then get the posts to match the holes. Maybe something like a small box strainer at each end to take some tension. We also use 8ft posts knocked in to around waist height.

If you live near derbyshire I would be happy to come and dig some holes 🙂

Would angling the posts away (say at 60 degrees) from the tensile forces (rather than setting them vertical) help?

Not any kind of engineer, but that 'feels' right (thinking about those freestanding garden hammocks you can buy).

slainte ❓ rob

Oops. Double post glitchiness.

I believe the only help it would do is when the tension is added move the posts up vertical.

Thanks all, plenty of food for thought!

You sad, sorry sons of singlespeeders....

No one, not one of you, not a single solitary muppet among you has asked how fat she is!

A pathetic and demeaning reflection on the falling standards on here.

It all depends on whether you want her to fall off or not. Do you?

Have a look at indoor slackline vids, they use free standing/portable wooden frames to brace the line between.

Is there not a nearby park with them tree thingies what you can stick it on? Seems a lot cheaper/easier than all of this.

You should set it up like this as it looks awesome:

[img] [/img]

I reckon you are over worrying. In the past we have just strung a climbing rope between 2 fence posts across the corner of a field. Biggest problem was winding the stretch out of the rope. If its above graaa the landing will be soft. I reckon falling off is more likely than moving the anchors.

you see loads of guys doing this in the parks in munich. looks fun, but
why does anyone bother buying a "maverik" (i.e. branded) slack line?

i got roped in to chipping in for a friends pressie: a slackline. the thing cost 60€, so 20€ from me.
you can pick up 15m ratchet straps (the type truckers use) for about 1/3 of the price and they are the same width....

have a look here ( http://www.slacklineexpress.com/force.htm) to get an idea of load bearing.

i'm wondering if you have to solid ground anchors that you can use and then a solid (wood, steel) tripod to raise the line.