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World records (Read 42303 times)
Mersa
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Re: World records
Reply #135 - Jul 23rd, 2017 at 5:05pm
 
Thanks for that , so am I correct to assume that
505m is the unconfirmed wr
477m is the weird release dart sling
437m is furthest confirmed wr with a non flight projectile.

Numbers are amazing .
Think I'm going to find a spot I can have a good attempt at it.
Seems like 200m is pretty doable. I have no idea what distances I've thrown. Rough guess around 75-100m with very average projectiles.
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Re: World records
Reply #136 - Jul 23rd, 2017 at 5:25pm
 
Mersa wrote on Jul 23rd, 2017 at 5:05pm:
so am I correct to assume that
505m is the unconfirmed wr
477m is the weird release dart sling
437m is furthest confirmed wr with a non flight projectile.


yes

Mersa wrote on Jul 23rd, 2017 at 5:05pm:
Seems like 200m is pretty doable


yes, through the posts seems most members max at 200m distance.
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Mersa
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Re: World records
Reply #137 - Jul 24th, 2017 at 4:08am
 
Confirmed a over 100m throw with stone today.
Got it within 5 trys but lost 3 rocks.
Nice, stuck in the soil too so I know it didn't bounce.
First time I measured out a distance and tryed to get past the marker .
27inch sling. Overhead style( I don't know the names).
Wonder how much improvement can be made on sling and projectile mods.

I'll be keen to find a space I can try go further . Seems finding the projectile might be the biggest issue .

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Re: World records
Reply #138 - Jul 24th, 2017 at 4:31am
 
Mersa wrote on Jul 24th, 2017 at 4:08am:
Seems finding the projectile might be the biggest issue .


you don't need to find it ,just see where it landed or usually hear the impact on a strange object(like a tree/concrete in the middle of a field).
but it is still the biggest issue.

the best way would be someone to be in the range like they do in olympic javelin and other throws but in this case behind cover wearing protection with a walkie talkie to know when to come out.
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Curious Aardvark
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Re: World records
Reply #139 - Jul 24th, 2017 at 6:49am
 
yes you do need to find the projectile. That's kind of crucial for any distance record.

Given that any new records will most likely be with lead glandes. Realistically you'll need a disused aircraft runway.
Impact on the tarmac should show up quite well.
It's on one of my todo lists: 'find disused airfield for world record attempt'.
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Re: World records
Reply #140 - Jul 24th, 2017 at 9:26am
 
Curious Aardvark wrote on Jul 24th, 2017 at 6:49am:
yes you do need to find the projectile. That's kind of crucial for any distance record.


i was talking about unofficial records, not guinness world records.
if i remember correctly about yurek's record, he heard the impact on a concrete structure 505m away.
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Re: World records
Reply #141 - Jul 28th, 2017 at 2:16pm
 
yeah, it's not a record.
unofficial or otherwise unless you can find the missile or impact point.

A clang half a kilometre away, while probably true - just isn't strong enough evidence for a claim.
And to be fair yurek never claimed a record, just said he'd heard it hit.
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Re: World records
Reply #142 - Jul 29th, 2017 at 4:10pm
 
I've seen him sling stones 220-250m ,according to my judgement. I have no doubt, he did 505 with lead.
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Re: World records
Reply #143 - Jul 23rd, 2021 at 5:29am
 
“Raising this thread from the dead”

Anyone think they could take out the WR ??

I’d be interested to see who’s confident?
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Re: World records
Reply #144 - Jul 23rd, 2021 at 8:19am
 
With lead is probably the only way it's going to be beaten.
I can't think of anyone around who has both the technique and conditioning to throw as far as Larry bray.

Missile recovery is also a major issue. These days health and safety will kill most proposed attempts stone dead.

Honestly, I can't see it being beaten any time soon
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Re: World records
Reply #145 - Jul 23rd, 2021 at 2:30pm
 
Then we'll be waiting on someone big, strong, and exceptionally skilled with long slings.
I don't think I'll be threatening the world record in this life...  Wink
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Re: World records
Reply #146 - Jul 23rd, 2021 at 4:50pm
 
A while back, I looked at some of "VoloundExpounds' " videos on YT. For one of his 2m long sling videos (1mm thick UHWMPE), I was just making some very vague approximations, but I calculated 94 m/s in the last 1/4 turn of his throw. This was assuming 1/4 rotation, and a 2m radius, but it was 2*pi*(2m) * (0.25) for the distance traveled, and it did it in 8 frames, at 240 fps. So, 3.14m/ (.033s) = 94 m/s. This was an approximation, but damn that's fast.   His release angle was not optimal, but if it could become moreso, and the wobble in the projectile wasn't that bad, it could go VERY far.

Here's a fun calculator to play with, the final distance is very sensitive to the drag coefficients (as one would expect).

https://www.desmos.com/calculator/on4xzwtdwz

So to get an idea of how far a throw at that speed could travel, I took my best throw as an example. It was 220m with a 30" sling, and probably an 80g stone,(maybe up to 100g...I wish I would have weighed it).  Using that as a benchmark, and my fastest sling speed with a tennis ball (55m/s) I was able to arrive at the drag coefficients that allowed that sort of distance at a 35° release angle (Cd = 0.07, A=0.01, m=0.1). That gives 290m without drag, and 220m with drag.

Using the same drag parameters, if you move the release velocity up to 94 m/s, without drag, it can go ~850m, but with drag, it goes ~450m. These are approximate, obviously, since drag forces are VERY sensitive, but it gives you an idea of what's possible.

It makes me think that Larry Bray's throw (437m with a 50g stone) must've been 90+ m/s, I'd think.

And as a bonus here are some drag coefficients of normal objects.
https://www.grc.nasa.gov/www/k-12/airplane/shaped.html
And how drag on a sphere is affected by speed through a fluid (air).
https://www.grc.nasa.gov/www/k-12/airplane/dragsphere.html
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John R.
 
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Re: World records
Reply #147 - Jul 23rd, 2021 at 9:13pm
 
Dale wrote on May 30th, 2005 at 9:05pm:
What I, personally, regard as the world's record for a sling, was set by Larry Bray on 1981 August 21st: 1434 feet, 2 inches (478 yards or 437.1 meters) with a rock weighing 1.8 ounces (52 grams).  The sling was elk-hide and dacron cord, 51 inches (129.5 cm) in length. Here's a picture (from the gallery) of the sling and the rock, with a 2-ounce lead egg sinker (I think) and a ruler as reference objects.
...

I think David Engvall's record should have been classified as something else.  Engvall slung a dart; Bray slung a ROCK.  So there.   Wink

As for the rules, it seems to go something like this: you do something, and document (with witnesses) exactly what you did and how you did it.  Send that to the Guinness people.  They will decide whether they agree that what you did is remarkable, and where to fit it into the book.  Bray had to do this, and so did Engvall.  They agreed with Bray's definition of what a sling is, and also with Engvall's definition.  So there.

If you're interested, Jurek got a copy of
Engvall's letter to Guinness
, claiming the record and telling how he did it, and posted it in the forum.   The letter was 13 pages long.  Unfortunately, only the first 4 pages of the letter are still available, but you get the flavor of what the Guinness people want.


Taken from page one

The equipment he did it with makes it so much more impressive.

I think slinging at thirst distances is reserved to a very small percentage of slingers.

I don’t believe claims over 500m and even if the launch velocity is high, as IG mentions there are a lot of things that can bring the distance down dramatically.

I think that it’s something that could be beaten (not by me)
But needs a very dedicated slinger.
Equipment, physical ability and finding the perfect place to attempt it.

I’d like to see if anyone thinks they could get that far. Sometimes people just need a push or a challenge.
I’d love to see some solid attempts
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IronGoober
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Re: World records
Reply #148 - Jul 23rd, 2021 at 9:29pm
 
Another consideration is location. If they were at elevation, it would make it easier than at sea level.
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John R.
 
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Re: World records
Reply #149 - Jul 23rd, 2021 at 9:40pm
 
I’ll use that as my excuse

I’m too close to the sea ha ha
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