Bridge Hammock

[schrochem]

I haven't. I'm afraid that would be rather much for the snow stake.

Don't know if a 12" spike would hold or not, or one of those lighter 10" yellow plastic jobbies.

If the tie-outs are 4' in length measured on the ground, and the hammock is 8', and the single stake is centered also at 4' out, then each line needs 1/sin(45 degrees) = 1.41 more force on it to get the same pull. Means the stake has 2*1.41 = 2.8 times the force on it that a single does.

There is advantage to reducing the number of big stakes needed though. But those snow stakes are light and strong. I think I would rather carry 8 of those at 1 oz each, and use 2 per corner than carry 2 big ones. And I just discovered that there is an 11-3/4" version of the snow stake too---I've got the 9.5" version.

Grizz

That makes sense to me.
Your reply made me wonder about something else.
You say the tieouts are 4'.
What happens if they are 8'?
Wouldn't that decrease the angle even more?

[schrochem]

In case the spreaderless design doesn't work out, I took one for the team and ordered two 18" 0.49 aluminum 7075 poles today.
I think they will hold just as well as the .625 but we'll see.
Unfortunately, it could take up to two weeks to get them.
It will be quite a weight savings.
According to this site it goes from 1.36oz/ft to 0.74oz/ft
And I suspect the end tips will be lighter as well.

I really should be working...
But it's close to quitting time anyway

[GrizzlyAdams]

two more things Grizz.
It looks like you aren't even attached to the lower webbing. Is it contributing in anyway hung like this?
Did you take a photo with hlh not in it?

I might have to test this myself.

Here's the picture. Left it out in the yard and it rained today.

Grizz

[warbonnetguy]

. I think I would rather carry 8 of those at 1 oz each, and use 2 per corner than carry 2 big ones. And I just discovered that there is an 11-3/4" version of the snow stake too---I've got the 9.5" version.

Grizz

one per corner is not enough?

[GrizzlyAdams]

one per corner is not enough?

so far one per corner is enough, in my yard. But it is a lot of stress on those lines, I can't be sure of the kind of ground I'll get in the field, I can cut the pull on a stake almost by 1/2 if I double the number of stakes, and I get this insurance for 4 oz more of stake plus maybe another oz of line. cheap at twice the price.

well, maybe not twice the price, but cheap.

Grizz

[warbonnetguy]

how much were the snow stakes?

so far one per corner is enough, in my yard. But it is a lot of stress on those lines, I can't be sure of the kind of ground I'll get in the field, I can cut the tension on a line almost by 1/2 if I double the number of stakes, and I get this insurance for 4 oz more of stake plus maybe another oz of line. cheap at twice the price.

well, maybe not twice the price, but cheap.

Grizz

[GrizzlyAdams]

how much were the snow stakes?

$1.50 each for the 9.5" one, $1.60 each for the 11.75" one

http://www.smcgear.net/products.asp?cat=4&pid=58

Grizz

[FanaticFringer]

I've just found the ultimate bridge hammock:http://www.furniturestoreblog.com/IM...nded%20Bed.jpg

[GrizzlyAdams]

In case the spreaderless design doesn't work out, I took one for the team and ordered two 18" 0.49 aluminum 7075 poles today.
I think they will hold just as well as the .625 but we'll see.
Unfortunately, it could take up to two weeks to get them.
It will be quite a weight savings.
According to this site it goes from 1.36oz/ft to 0.74oz/ft
And I suspect the end tips will be lighter as well.

I really should be working...
But it's close to quitting time anyway

had a look at the site...it gives strength in terms of KSI (1000 lbs/in^2), and the 7075 poles are rated to 80 KSI. I've not used these units before, so am just guessing.... so a pole with 0.49" OD and 0.428 ID presents a cross-section area of pi*0.49^2 - pi*0.428^2 = 0.1788 in^2.
A KSI of 80,000 lbs/in^2 means the cross section of 0.1788 in^2 can carry a pressure of 0.1788*80,000 lbs = 14,304 lbs. Can that possibly be right?
If it is, you could get away with the 1/4" tube at 0.23 oz per foot (3,763 lbs on that cross-section). Or if you use the "wall" measurement (I would think the OD-ID = wall, but it doesn't) then the cross-section is good to 1946 lbs.

that's an amazingly low weight. The 2.8mm spyderline I'm using is 0.221 oz per yard.

I bet these cost a chunk of change.

cool find.

Grizz

[schrochem]

had a look at the site...it gives strength in terms of KSI (1000 lbs/in^2), and the 7075 poles are rated to 80 KSI. I've not used these units before, so am just guessing.... so a pole with 0.49" OD and 0.428 ID presents a cross-section area of pi*0.49^2 - pi*0.428^2 = 0.1788 in^2.
A KSI of 80,000 lbs/in^2 means the cross section of 0.1788 in^2 can carry a pressure of 0.1788*80,000 lbs = 14,304 lbs. Can that possibly be right?
If it is, you could get away with the 1/4" tube at 0.23 oz per foot (3,763 lbs on that cross-section). Or if you use the "wall" measurement (I would think the OD-ID = wall, but it doesn't) then the cross-section is good to 1946 lbs.

that's an amazingly low weight. The 2.8mm spyderline I'm using is 0.221 oz per yard.

I bet these cost a chunk of change.

cool find.

Grizz

Well I believe most of the tent poles out there are made of 7075, but maybe it's 6061. Earlier in the thread I mentioned that I tried the .344 with a .019 wall and it didn't hold at all. It flexed with just me pushing down on the hammock. That piece of .344 was from my tarptent.
I ordered it from here for $7.5 for a 18" piece. Not too bad if it works. I thought about also getting the .433 ($5.5 for an 18" piece)but decided against it.

I'm still wondering about longer lines on your tieouts. Would 8' instead of 4' offer any benefit? Also, the unoccupied hammock showed me again how you have the lines to the tree. I suspect you have to hang it that way to be able to do the spreaderless design??