Welbeck EMAS FITA Star 20/7/08

[Watch_Man]

Here are some photos taken at todays EMAS FITA Star at Welbeck. This is without doubt the windiest competition we have been to that has not been abandoned. One of the judges was saying the wind was gusting to 45mph

Here is a link to the Flickr hosted images EMAS FITA Star 20 July 2008 - a set on Flickr


Simon Terry at Welbeck

[grimsby archer]

what? no results yet?

nice photos trevor, thanks for sharing

very interesting study on "catching an arrow in flight"

interesting shapes many of the bowstrings make in the power stroke. I wonder, is this typical, an effect of the wind or an optical illusion caused by the image? Some of them look like the bowstring is in advance of the limbtip and the arrow

[Watch_Man]

Originally Posted by grimsby archer

what? no results yet?

nice photos trevor, thanks for sharing

very interesting study on "catching an arrow in flight"

interesting shapes many of the bowstrings make in the power stroke. I wonder, is this typical, an effect of the wind or an optical illusion caused by the image? Some of them look like the bowstring is in advance of the limbtip and the arrow

Simon Terry took the mens recurve with around 1312 (I think) and the only person to break 1300. He was miles ahead of the other recurves. Ladies recurve winner was Phllippa Lowe. Simon Scott won gents compound with 1296 and Wendy ladies compound with 1280. For your interest Graham (the Meggy) came second in gents compound with around 1258 (or there abouts)

Hardly anyone retired, and despite some scopes going over and a few chairs blowing down, everyone continued to shoot. The girls end were having a good laugh. I saw Emma Parker caught by a gust and blown forward, Wendy was blown off the line quite a few times and some of the other ladies looked totally kerrnackered holding in the wind.

There seems to be a common shape created on release. As these are 6mp still images and not video they show this much better. I don't think it is an optical illusion but actually what happens on release. As you have seen, todays project for me was catching arrows in flight just after release.

[grimsby archer]

Way to go Graham!
When you say Wendy was "blown off the line" was that physically by a gust of wind, or metaphorically by a judge with a whistle for taking a long time to shoot due to the wind?
As I said, I find the bowstring patterns very interesting, especially in that the string above the arrow gives a very differnt pattern to that below it. I feel that this should be significant in some way, but Im not honestly sure what or how

Oh yes, and well done wendy of course too!

[speed]

Excellent set of photo's well worth everyone spending the time to look through them.

Anyone who ever wondered what happens to the string upon release will have thier question answered.

[Mikey B]

Would this string pattern be caused by the arrow giving the string a 'tug', for lack of a better word, just before the nock disengages? does this mean that the nock fit is too tight for maximum efficiency (arrow speed)? Is the nock actually being disengaged by a combination of arrow momentum and the string trying to return to rest? (thus pulling back, breifly, on the nock)

[grimsby archer]

Originally Posted by Mikey B

Would this string pattern be caused by the arrow giving the string a 'tug', for lack of a better word, just before the nock disengages? does this mean that the nock fit is too tight for maximum efficiency (arrow speed)? Is the nock actually being disengaged by a combination of arrow momentum and the string trying to return to rest? (thus pulling back, breifly, on the nock)

but in some o fthe photos wm posted, the string appears to be giving an remarkable pattern by about half way through the power stroke, well before the arrow disengages and even before the string reaches the neutral "bracing height" (which it then passes bfore reaching the forward position where the arrow disengages) I think

[Mikey B]

Hmmmm... Maybe because the arrow is nocked above centre (tiller probably also has an effect as well) it causes the top of the string to accelerate slower causing this pattern? For maximum velocity the arrow would have to disengage the string at the natural brace height, this would probably need such a loose nock (no snap/click at all) fit that everyone would accidentally be dry-firing their bows all the time though.

[pHz]

nice work trevor

slainte rob

[Watch_Man]

Originally Posted by grimsby archer

Way to go Graham!
When you say Wendy was "blown off the line" was that physically by a gust of wind, or metaphorically by a judge with a whistle for taking a long time to shoot due to the wind?
As I said, I find the bowstring patterns very interesting, especially in that the string above the arrow gives a very differnt pattern to that below it. I feel that this should be significant in some way, but Im not honestly sure what or how

Oh yes, and well done wendy of course too!

Physically by a gust of wind, however several archers were timed out as they were having to wait between gusts to get their arrows off. One particular lady (who was timed off at least once) shot nearly every last arrow with a second or two to spare.

I'm sure someone must have noticed this bow string shape before, One of the Physics or maths bods on the forum can probably explain it.

Thanks for the comments on the photo's I'm pleased they are of interest. Hopefully someone can explain what is going on. I just though they made a cool shape The forum is full of tame physicists, maths geeks and engineers so I am sure someone has an explanation.