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Ivo Vanmontfort
(Ivo) - MLife
MYOG duomid on 02/27/2011 01:45:43 MST Print View

A myog duomid (about 50MPH)

Van pyreneeenjuni2010

Edited by Ivo on 02/27/2011 02:08:09 MST.

todd harper
(funnymoney) - MLife

Locale: Sunshine State
Re: MYOG duomid on 02/27/2011 16:10:29 MST Print View

Whoa!

Ryan W
(mwilks) - F
Re: Re: MYOG duomid on 02/27/2011 17:15:48 MST Print View

"Whoa!"

Ya, my thoughts exactly! I'm not sure what this means for my own intention of a myog duomid with newbie sewing skills.

Jason Elsworth
(jephoto) - M

Locale: New Zealand
MYOG duomid on 02/27/2011 17:41:47 MST Print View

I had seen the Duomid picture somewhere else, but didn't realise it was a MYOG version. Looks like the bigger panel is pitched into the wind and no centre tie out. When I pitched my Duomid, as a test, in similar conditions results were much the same and the centre pole was flexing alarmingly. It would have been a frightening night if I have had to be out in it. However, 50 mph is not going to be that much fun in any shelter.

Mat Tallman
(wehtaM) - F

Locale: Midwest
Re: MYOG duomid on 02/27/2011 17:57:14 MST Print View

That mid appears to be in one of the worst spots around in that picture. It appears that there are some large boulders down the valley a bit that would have made great windbreaks in those conditions, in addition to getting you off the valley floor. That looks like a precarious spot in the event of a sudden rise in creek level/flash flood from rains up the valley. It's tough to judge though, the elevation between the creek and the tarp may be more than it appears in that camera angle.

Sub-optimal site selection and no center guyouts can make for precarious situations it seems.

jerry adams
(retiredjerry) - MLife

Locale: Oregon and Washington
re on 02/27/2011 18:23:15 MST Print View

That's a really cool shot - 50 MPH - wow!

My MYOG pyramid looks like that too, although I probably haven't been in quite as high wind. It looks like it'll collapse, but it doesn't.

I wonder if you're really better off with a guyline midway up? It's a very complicated thing to calculate. Intuitively, you'de be better off with a mid guyline, but intuition isn't always correct. I don't think the silnylon fabric is going to rip.

You'de be better off sheltered at lower elevation in the trees. "Hike high and camp low". But sometimes that just doesn't work out. I can sure think of some times I've camped high and had some meorable scenery.

Franco Darioli
(Franco) - M

Locale: Melbourne
Shelter Pictures - Stormy conditions on 02/27/2011 18:55:26 MST Print View

Using a boulder as a protective barrier may backfire if the boulder isn't large enough.
What happens is that the wind will go around the boulder and create a vortex on the other side , the tent site..
like this :
Wind around solid objects

Drawing stolen from here:
http://www.kaper.us/basics/BASICS_040502_hunt_windflow.html
Franco

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: Shelter Pictures - Stormy conditions on 02/27/2011 19:32:20 MST Print View

> Using a boulder as a protective barrier may backfire if the boulder isn't large enough.

And How!
We spent one night (behind such a boulder) trying to guess which of the four points of the compass the next blast would come from.
Make that 5 points: we also got thumped from above.

We much prefer being just a little down-wind from a good clump of snow-gums.

Cheers

Mat Tallman
(wehtaM) - F

Locale: Midwest
Re: Shelter Pictures - Stormy conditions on 02/27/2011 19:45:08 MST Print View

Franco,

A perfect cube in laminar flow is not necessarily a very fair analog to a boulder in alpine winds (read: largely turbulent flow). Lots of variables exist that would affect the region of boundary layer separation over the boulder, and the location of the resulting vortices, not to mention that the velocity of those resulting vortices would be, by and large, considerably lower than the prevailing winds. It's been a couple of years since my last fluid mechanics class, but if it were me, I'd take my chances with the best windbreak in the area before setting up in the center of what appears to be tantamount to a wind tunnel.

Wow, I'm such a nerd...

Dan Durston
(dandydan) - M

Locale: Cascadia
Wet on 02/27/2011 19:47:49 MST Print View

Here's a picture from this fall.

This low spot was chosen because when we set up camp, the weather looked dry but with high winds, and we didn't want to be exposed to more high winds after the tent got rocked all night the previous night.

During the night we got a few inches of heavy snow, and then it turned to rain which melted a lot of the snow and flooded our low spot. Thankfully the tent floor kept all the water out. On my NeoAir, I actually felt like I was floating on water when I woke up. The water was several inches deep.


Before:
Tent Flood A

After:
Tent Flood

Dondo .
(Dondo) - F

Locale: Colorado Rockies
Re: Shelter Pictures - Stormy conditions on 02/27/2011 19:57:50 MST Print View

Golite Shangri-La 2 after an October snowstormShangri-La after storm

Edited by Dondo on 02/27/2011 20:02:10 MST.

kevin timm
(ktimm) - M

Locale: Colorado (SeekOutside)
Guyouts and Faux Structure on 02/27/2011 19:59:52 MST Print View

Side guyouts certain help mid / tipi style tents in high wind. Another help is "faux structure" with a light poly or dyneema line.

Ben 2 World
(ben2world) - MLife

Locale: So Cal
Re: Re: Shelter Pictures - Stormy conditions on 02/27/2011 20:00:27 MST Print View

Golite Shangri-la 2? I don't see it...

Greg Mihalik
(greg23) - M

Locale: Colorado
Re: Shelter Pictures - Stormy conditions on 02/27/2011 20:17:21 MST Print View

Pounds force per square foot, perpendicular, as a function of wind speed-

MPH...Force
20.......2.0
30.......4.4
40.......7.9
50......12.3
60......17.7

Full table can be found at
http://chestofbooks.com/crafts/scientific-american/Scientific-American-Reference-Book/Force-Of-Wind-When-Blowing-Perpendicularly-Upon-A-Surface-Of.html

Edited by greg23 on 02/27/2011 20:19:57 MST.

Eugene Smith
(Eugeneius) - MLife

Locale: Nuevo Mexico
"Shelter Pictures - Stormy conditions" on 02/27/2011 20:17:29 MST Print View

IMG_1954

IMG_1958 - Version 2

Nothing I would consider a "big storm" but 25-35mph gusts and windblown snow for a few hours into the early evening. MLD Trailstar pitched alongside a Golite SL-2.

Dave U
(FamilyGuy) - F

Locale: Rockies
Shelter Pictures - Stormy conditions on 02/27/2011 21:12:30 MST Print View

The SL-2 looks bomber!

Gabe Joyes
(gabe_joyes) - F - M

Locale: Lander, WY
I love pyrimids on 02/28/2011 09:00:30 MST Print View

Black Diamond Mid in the Wind River Range, October

Went from traces of snow to about a foot in less than 8 hours. We were protected from the wind, so that wasn't an issue at all. The BD handled the snow like a champ, just lost a lot of interior space from the snow weighing the walls down. Oveall I was very impressed.

Tyson Marshall
(sheepNgeese) - MLife

Locale: Ventura County (formerly PNW)
Quinzhee and Mountain Hardwear Approach on 02/28/2011 16:05:28 MST Print View

Hard to see, but there is a quinzhee down there...Mountain Hardwear Approach after one night...Or just pick a spot away from the inclement weather...

Image 1: Quinzhee - hard to see, but it's down there...

Image 2: Mountain Hardwear Approach after one night...

Image 3: Hammock: stayed away from the mean weather...

Edited by sheepNgeese on 02/28/2011 16:06:59 MST.

Miguel Arboleda
(butuki) - MLife

Locale: Kanto Plain, Japan
Re: Shelter Pictures - Stormy conditions on 02/28/2011 17:17:31 MST Print View

In fairness to Stephenson, they pitched the MYOG shelter end to the wind and the 2R broadside to the wind -- hardly a fair comparison.

Hi Michael, just to state up front, I really have no particular interest in either shelter. I was just showing some pictures of two tents in stormy conditions.

But I do have to ask you to look at the page again. The Stephenson is actually set up both ways. end and broadside to wind. The end to wind seems to be working fine.

As to the comment about the guylines on the side, true. But there is also the collapse of the poles to consider in those pictures, plus the picture of the Rainbow earlier. Trekking poles and shorter tent poles are far less likely to collapse.

I should add, that guylines on the tent poles themselves would make a huge difference in their stability.

Edited by butuki on 02/28/2011 17:21:46 MST.

John Kays
(johnk) - M

Locale: SoCal
Unexpected Snow on 02/28/2011 17:47:22 MST Print View

Tyvek Mid night before
TyMidBefore

next morning
nextmorning