[Closed] What size post for a hammock?

https://www.google.com/maps/ @55.4683707,-4.6304757,3a,23.5y,354.09h,96.47t/data=!3m6!1e1!3m4!1sWUORbkk36TTBH5Wp7lMUWA!2e0!7i16384!8i8192

O'neil gates and fencing supplies in Ayr, do the big round fence posts for farmers gates etc, give them a try.

I've a hammock, had it for 2 years, still not put it up, another job that needs done during lockdown!.

Also will the wife and me be able to lift a 3m x 150mm post, no idea how heavy it would be…

If my maths is right, about 40kg.

My hammock post is a 100mm post, with a half-height 100mm post bolted on the load bearing side and also concreted in.

It's done the job, and held up a fence whilst doing it.

My guess was about 33kg for pine, more for hardwood.
Wood weight varies a lot

I was toying with putting in hammock posts when we got rid of the kids' trampoline, but decided on a hammock stand as it was less faff.

I thought I’d use 150mm posts but struggling to source them.

Rowan Timber in Ayr?

We use their head office branch and they can usually get us odd sized stuff.

Also will the wife and me be able to lift a 3m x 150mm post, no idea how heavy it would be

Just over twice as heavy as a 100mm post. If you could lift two and a quarter 100mm posts ( or 9 50mm x 50mm ) you could lift a 150mm one.

Aye, that'd be the other option, or MGM timber in Prestwick.

Will 100mm be OK without noticeably flexing? Or should I continue my search? I can tie the tops together and concrete them into the ground.

I would have thought if you're building a pergola then the actual size of the posts could be quite small as the bending loads are then minimal, as long as the side loads are also dealt with by tieing the pergola together in both dimensions.

I've seen DIY hammock slings using 2x4 timbers that work fine, so long as there's top or bottom bracing to stop the suppports bending inwards. 3x3 sounds ok to me

We hang ours off the uprights of a 4" round rail swingset.
Granted in that configuration they aren't massively stressed as the top rail carries the load in compression, but previously I made a hammock stand out of 4x2's with the post at a ~30 degree angle.

I'd have thought a 4" round rail (£10 for a 4m length last time I bought) sunk into the ground should be fine. If you can give it a bit of angle away from the hammock even more so!

EDIT: The design above is more or less what I built, but I think my uprights were less well supported than that. (the braces were shorter bits of wood as they were cut from one length cos I'm tight!) my upright was unsupported for around 4'.
EDIT 2: Actually my uprights were only a single piece of 4x2... It was also only screwed together!

Thanks for the ideas and supplier suggestions, unfortunately the local ones don’t have anything or are closed to public, although haven’t phoned MGM yet.

The bracing ideas are good except I don’t really want diagonal braces, I’m trying to keep it just the 3 posts as most of the time it probably won’t have hammocks hanging in it.

I used two 3m long 100mm posts when I did mine on the allotment. About 1 metre of the posts sunk into the ground, and a 75mm round pole in between them at the top to counter any flexing inwards and of course for the grape vines to grow along.

Not the best photo but got it finished last night 🙂

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Next job is to build a deck under it and decide what to put across the roof, I’m thinking larch strip wood but not wanting to spend £££

Edit: also just seen my last post said 3 posts. The triangle idea went out the window, a rectangle is much more useful. It gets the sun in the morning so can put a table underneath too.

Looks good! 👌🏻

Cheers 🙂

Have started to worry that a 4m span might be too much between the posts. Not for any reason, just on reflection of the size of the thing.