It's been so many years since I went camping, I never really paid any attention to it before but I think having the children with me now I want to make sure I make the tent as stable as I can.
What I naturally do is take a guy rope and run it in line with the seam, so if it's on the corner of a square tent for example, the rope will be at 45 degrees if you know what I mean?! If it's sort of mid-way along the length then i'll run it at 90 degrees to it. Also, I don't run them too tight so they will let the tent give a little in the wind.
Does this sound about right?
------------- Proud Mommy of a Vango DD360, Outwell Montana 4, Quechua 3 second air, Quechua 2 second air.... oh... twin daughters too!
i dont know if im doing it right, but i always tighten my guy ropes up nice and tight to stop any movement, 2 weeks ago i was at reighton sands(I WILL NOT GO BACK ,DONT GO THERE EVER) and as its on the edge of a cliff it gets really windy, my tent hardly budged and its only a cheapy , yet some of the more expensive brands were belowing alover the place, a lot of them were seen to be trying to sort there tents out all the time, all i did was check the ropes when we got back from our day trips out.
Hi Jamie ,best not to guy out too tightly when it really windy .allow the tent a little bit of 'give' to prevent damage to the tent ,if it can move a little it is less likely to tear!
Not loose so its actively flapping around but not tight so that its stressing the the guy rope attatchement and straining the stitching ,if you know what I mean ? hard to explain ,easier to demonstrate ,im sure someone else will be along with some mathmatical equation of exactly how tight the guys should be in windy conditions
I go round the tent every morning and flick the guylines...if they are tight, I slacken them down, if they`re flopping, I tighten them up. You want them smooth and taut but not drum tight. Tent poles expand on a hot day, and if you`ve tightened the guys too much the guylines will stress the seams. You can always snug them up a bit before going to bed, when the tent is cooler.
On a frame tent, you`re basically holding the canvas down tight onto the frame with a combination of guylines and bottom pegs. . On a synthetic tent with fibreglass poles or similar, the guylines hold the poles in shape and prevent excessive flexing. Excessive flexing is a major cause of pole breakage. But if you guy a fibreglass pole into a totally rigid shape, it can break too. You want a very small amount of movement.
If you`re worried that the tent is flexing too much in a storm even with the guylines taut, then run a second or even third guyline from the most vunerable guying points on the windward side, to brace them more. I alwas keep several spare guylines with sliders already attached in the tent repair kit, though in an emergency use the washing line or strong string or cord. And you should carry enough pegs to double peg every main point if necessary. Delta pegs are great, of course, but have spare standard pegs too.
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Topic: Whats the best way to guy out?
,im sure someone else will be along with some mathmatical equation of exactly how tight the guys should be in windy conditions 
