As I mentioned in the "Miss me?" thread, I tested my Hennessy Expedition Asym in Norway on a backpacking trip. Since it's a bit of kit we all are fairly familiar with, and there are doubtless people who are wondering whether to buy it, I'll share my own opinion on it. I know someone recently posted a review from another site, but since mine is less in favour of the product maybe you'll find it interesting reading as well
First impression of the hammock in the bag are fairly good: it's not too big, although it is by no means a superlight backpacker's device, but then it isn't intended to be. At about a kilo it weighs the same as a large tarp, or a medium tarp and hammock.
I must say at this point that I have not bought any extras for it - no hex fly, no snakeskins, etc. You empty out the bag (preferably checking the ground isn't crawling with ants that you will later find exploring your face in the middle of the night - yes I do speak from experience ), and there are four things in it - the hammock, the tarp, and two lengths of wide webbing.
First we must get up the hammock. You are supposed to wrap the webbing around the tree to protect the bark. There are two problems with this - one, that the webbing means the distance between the trees, already long, needs to be even longer; two, that it is not tremendously easy to pass the rope through the flat loops of the webbing. It's hard to explain in text, but the way they crush together does not make things easy. In addition to this, the smooth fabric of the webbing does not provide much friction - bad news for knots. Add to this the rope not being very flexible and you have a bit of a knot problem. You see, there being little friction in the webbing means knots that you pull tight and then tie off will be difficult to tie off as you still have to tension it a lot while tying, if that makes any sense.
For example, the round turn and two half hitches - it is necessary to keep your weight on the bitter end or else the hammock will fall while you tie the two half hitches - but it's impossible to do this. Try tying one round a greasy pole if you're still not with me. I wondered if you could do more turns and thus increase the friction - but no, because you just can't fit the rope through thanks to the shape of the loops in the webbing. You could tie a bowline, but only at one end, because the hammock needs to be pitched taut as a bowstring, (more on that later), and it is impossible to tension a bowline while tying it. And as I said, the rope is not at all flexible. Fine for knots like the bowline, where tension on the standing end pulls the knot together. But for a round turn and two half hitches, the inflexibility of the rope actually works against you and pulls the knot open. I would say three, four or even five half hitches would be a much better idea, or a fisherman's bend if you know the knot.
So, anyway, pitching. It is absolutely imperative that the hammock is pitched flat. I mean imperative. And I mean spirit level flat. This, for me, is the big bad point of the hammock. The reason it must be so flat is because if you have it head down, you end up in a ball at the bottom by morning, with the most terrific back cramps. And if you pitch it slightly head up (as I am used to doing with hammocks), you will spend an even more miserable night, falling out of the hammock. This is because of the way you get in and out of it - there is a slit up the belly of the hammock at one end, that when you lie in it is pulled relatively tightly closed - it only really needs to be closed enough to stop the wind coming through. Normally, it's a good design - apart from snagging expensive wool socks and jumpers on the velcro, it does enable you to hop in and out easily, and does not need zipping up. However! If you pitch head up, your body gently pushes the hole open. You then promptly fall on your bum onto the earth/rocks/tree roots/friends. There is no way to avoid this but to pitch flat. I tried turning round in the hammock, and after the usual very tippy contortion sequence, I found that sleeping the other way just meant that you fell on your head, which was much more painful (just my luck to place the pick of my ice axe right where my head fell! ). You must must must pitch flat. To me, that's pretty rubbish. I never pitched above flat ground in Norway - ever. Where I was, the bottoms of valleys were marsh, river or lake - no trees. And what's more the forests were young silver birch for the most part, and on the south facing slopes were very thick. This meant it was very difficult to get two trees to pitch between, let alone two trees each for my friends, and a convenient area to cook. And the Hennessy needs a very large tree spacing to set up ideally. The reasons for this are the webbing straps, and the tarp arrangement.
The tarp arrangement can be summed up in my opinion in two words: ****ing awful. Insert the rudest word you know in the starred space, and you'll be roughly saying what I mean. It is just rubbish. The way the tarp attaches is by a plastic clip onto another plastic clip, on the end of a piece of string that slides it up and down the main support ropes using a prusik knot. There is another clip that I though at first was a waste of space, but reading the instructions I found it attaches the tarp to the support rope. Given that it's already attached via another clip and a very short piece of string, I found that I had been quite right - it is a waste of space. What's more, it is exceptionally difficult to get the clip over the rope, as it is clearly designed for something much thinner. In the morning, unclipping it, it is worse, as the plastic is harder thanks to the cold. I broke fingernails (I thought that only happened to girls? ) trying to get it open far enough, used swiss army knives, credit cards, everything. Eventually I cut the damn thing off. The tarp is asym shaped - that is, it is an asymmetrical diamond, which is designed to cover your shape as you lie in the asym hammock. It's a nice idea, and weight saving too, but falls down because a) the angle different people lie in it due to their height affects how well it covers them; b) it is tricky to see which way on it goes before you've actually put it on; and c) it is utterly useless at keeping your kit dry, unless you have another hammock to hold it close below the bottom of the Hennessy. Admittedly if it rained, the ground would probably get wet and your bag would not be saved by the tarp, but it would certainly help on flat ground at least. Plus it is miserable to plop besocked feet out of the hammock into soaking wet mud, having missed your boots thanks to the ungodly hour. A decent tarp would mostly keep the ground dry under you, and on a hillside rudimentary drainage channels can be very easily and quickly dug.
But the real god-awful jump-up-and-down-and-swear bit is how the tarp functions. The ridgeline is a very thin cord that runs through the hammock, supporting the permanently attached mosquito net. I personally have grave concerns about its durability, as the sheer tension it is under when you get in is enormous. Anyway. The theory is that when the tarp is attached to the support ropes by clips and prusiks, you also peg down or tie down the other two corners of the diamond. It's very nice to only have two peg points - it also speeds up setup a lot. You can also tie out the sides of the hammock with elastic cords. Apparently this is to stabilise it, although I've noticed no difference when I have not used them. You can peg the tarp of course at a shallow or steep angle. Bearing in mind its size, I would not ever pitch it shallow except on guaranteed fair nights. You of course pitch it nice and tight, naively thinking it will stay like that. That done, you grin and look at your peapod shaped tent contraption, and go and have a brew.
Later, you come back, pop in the sleeping mat (oh boy, do you need that - unless you've a great need of a numb back - beats morphine any day) and sleeping bag (as always for a hammock, unzip it first - or else you'll need to be a reverse Houdini to get into it). You sit in the opening to the hammock (again, I am concerned about the long term durability of this opening - it is not as reinforced as I would like, and all the force is concentrated on a tiny point), and slip off your boots. You then need to cover them in something waterproof as the tiny tarp will not keep them dry. You lie back and then after utilising every yoga position yet invented, manage to get in sleeping bag on sleeping mat in asym position. (I say that you do - in truth, I don't believe that anyone apart from possibly a very short Thai contortionist could physically manage that ). You notice that the velcro opening has quite neatly flapped shut.
First impression of the hammock in the bag are fairly good: it's not too big, although it is by no means a superlight backpacker's device, but then it isn't intended to be. At about a kilo it weighs the same as a large tarp, or a medium tarp and hammock.
I must say at this point that I have not bought any extras for it - no hex fly, no snakeskins, etc. You empty out the bag (preferably checking the ground isn't crawling with ants that you will later find exploring your face in the middle of the night - yes I do speak from experience ), and there are four things in it - the hammock, the tarp, and two lengths of wide webbing.
First we must get up the hammock. You are supposed to wrap the webbing around the tree to protect the bark. There are two problems with this - one, that the webbing means the distance between the trees, already long, needs to be even longer; two, that it is not tremendously easy to pass the rope through the flat loops of the webbing. It's hard to explain in text, but the way they crush together does not make things easy. In addition to this, the smooth fabric of the webbing does not provide much friction - bad news for knots. Add to this the rope not being very flexible and you have a bit of a knot problem. You see, there being little friction in the webbing means knots that you pull tight and then tie off will be difficult to tie off as you still have to tension it a lot while tying, if that makes any sense.
For example, the round turn and two half hitches - it is necessary to keep your weight on the bitter end or else the hammock will fall while you tie the two half hitches - but it's impossible to do this. Try tying one round a greasy pole if you're still not with me. I wondered if you could do more turns and thus increase the friction - but no, because you just can't fit the rope through thanks to the shape of the loops in the webbing. You could tie a bowline, but only at one end, because the hammock needs to be pitched taut as a bowstring, (more on that later), and it is impossible to tension a bowline while tying it. And as I said, the rope is not at all flexible. Fine for knots like the bowline, where tension on the standing end pulls the knot together. But for a round turn and two half hitches, the inflexibility of the rope actually works against you and pulls the knot open. I would say three, four or even five half hitches would be a much better idea, or a fisherman's bend if you know the knot.
So, anyway, pitching. It is absolutely imperative that the hammock is pitched flat. I mean imperative. And I mean spirit level flat. This, for me, is the big bad point of the hammock. The reason it must be so flat is because if you have it head down, you end up in a ball at the bottom by morning, with the most terrific back cramps. And if you pitch it slightly head up (as I am used to doing with hammocks), you will spend an even more miserable night, falling out of the hammock. This is because of the way you get in and out of it - there is a slit up the belly of the hammock at one end, that when you lie in it is pulled relatively tightly closed - it only really needs to be closed enough to stop the wind coming through. Normally, it's a good design - apart from snagging expensive wool socks and jumpers on the velcro, it does enable you to hop in and out easily, and does not need zipping up. However! If you pitch head up, your body gently pushes the hole open. You then promptly fall on your bum onto the earth/rocks/tree roots/friends. There is no way to avoid this but to pitch flat. I tried turning round in the hammock, and after the usual very tippy contortion sequence, I found that sleeping the other way just meant that you fell on your head, which was much more painful (just my luck to place the pick of my ice axe right where my head fell! ). You must must must pitch flat. To me, that's pretty rubbish. I never pitched above flat ground in Norway - ever. Where I was, the bottoms of valleys were marsh, river or lake - no trees. And what's more the forests were young silver birch for the most part, and on the south facing slopes were very thick. This meant it was very difficult to get two trees to pitch between, let alone two trees each for my friends, and a convenient area to cook. And the Hennessy needs a very large tree spacing to set up ideally. The reasons for this are the webbing straps, and the tarp arrangement.
The tarp arrangement can be summed up in my opinion in two words: ****ing awful. Insert the rudest word you know in the starred space, and you'll be roughly saying what I mean. It is just rubbish. The way the tarp attaches is by a plastic clip onto another plastic clip, on the end of a piece of string that slides it up and down the main support ropes using a prusik knot. There is another clip that I though at first was a waste of space, but reading the instructions I found it attaches the tarp to the support rope. Given that it's already attached via another clip and a very short piece of string, I found that I had been quite right - it is a waste of space. What's more, it is exceptionally difficult to get the clip over the rope, as it is clearly designed for something much thinner. In the morning, unclipping it, it is worse, as the plastic is harder thanks to the cold. I broke fingernails (I thought that only happened to girls? ) trying to get it open far enough, used swiss army knives, credit cards, everything. Eventually I cut the damn thing off. The tarp is asym shaped - that is, it is an asymmetrical diamond, which is designed to cover your shape as you lie in the asym hammock. It's a nice idea, and weight saving too, but falls down because a) the angle different people lie in it due to their height affects how well it covers them; b) it is tricky to see which way on it goes before you've actually put it on; and c) it is utterly useless at keeping your kit dry, unless you have another hammock to hold it close below the bottom of the Hennessy. Admittedly if it rained, the ground would probably get wet and your bag would not be saved by the tarp, but it would certainly help on flat ground at least. Plus it is miserable to plop besocked feet out of the hammock into soaking wet mud, having missed your boots thanks to the ungodly hour. A decent tarp would mostly keep the ground dry under you, and on a hillside rudimentary drainage channels can be very easily and quickly dug.
But the real god-awful jump-up-and-down-and-swear bit is how the tarp functions. The ridgeline is a very thin cord that runs through the hammock, supporting the permanently attached mosquito net. I personally have grave concerns about its durability, as the sheer tension it is under when you get in is enormous. Anyway. The theory is that when the tarp is attached to the support ropes by clips and prusiks, you also peg down or tie down the other two corners of the diamond. It's very nice to only have two peg points - it also speeds up setup a lot. You can also tie out the sides of the hammock with elastic cords. Apparently this is to stabilise it, although I've noticed no difference when I have not used them. You can peg the tarp of course at a shallow or steep angle. Bearing in mind its size, I would not ever pitch it shallow except on guaranteed fair nights. You of course pitch it nice and tight, naively thinking it will stay like that. That done, you grin and look at your peapod shaped tent contraption, and go and have a brew.
Later, you come back, pop in the sleeping mat (oh boy, do you need that - unless you've a great need of a numb back - beats morphine any day) and sleeping bag (as always for a hammock, unzip it first - or else you'll need to be a reverse Houdini to get into it). You sit in the opening to the hammock (again, I am concerned about the long term durability of this opening - it is not as reinforced as I would like, and all the force is concentrated on a tiny point), and slip off your boots. You then need to cover them in something waterproof as the tiny tarp will not keep them dry. You lie back and then after utilising every yoga position yet invented, manage to get in sleeping bag on sleeping mat in asym position. (I say that you do - in truth, I don't believe that anyone apart from possibly a very short Thai contortionist could physically manage that ). You notice that the velcro opening has quite neatly flapped shut.