Slinging.org Forum - Pocket Clip Sling Grip

Altay Senior Member Offline Romans 8 Posts: 447 Gibsonia, PA (USA) Gender:	Re: Pocket Clip Sling Grip Reply #30 - Mar 23^rd, 2006 at 9:34pm Quote: Grrrrrr..... Pulls out the not-so-ancient M60 MY PENNY! You know, it'd be much easier to just work for the money... ("Oh, I'm no fun anymore")
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CanDo Interfector Viris Spurii Past Moderator Offline Posts: 1652 New England, USA Gender:	Re: Pocket Clip Sling Grip Reply #31 - Mar 23^rd, 2006 at 10:17pm hmm.... i was thinking of inlaying a thin strip of ebony lengthwise into the center of the handle of my latest bow. Is there any special problem that I'd need to be concerned with?
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Altay Senior Member Offline Romans 8 Posts: 447 Gibsonia, PA (USA) Gender:	Re: Pocket Clip Sling Grip Reply #32 - Mar 23^rd, 2006 at 10:19pm The fact that this topic belongs in "Other Primitive Weapons"?
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CanDo Interfector Viris Spurii Past Moderator Offline Posts: 1652 New England, USA Gender:	Re: Pocket Clip Sling Grip Reply #33 - Mar 23^rd, 2006 at 10:24pm haha, yes, I know. but the question is about ebony, not the bow. and TS has already addressed ebony. and he's the one who started the thread. It will come back to his sling quickly enough, I'm sure. Yes I actually thought through this while posting the question
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Yahweh Bless you in Yeshua Interfector Viris Spurii Offline Matthew 11:25-30 Posts: 1700 Gender:	Re: Pocket Clip Sling Grip Reply #34 - Mar 23^rd, 2006 at 11:33pm One may be able to obtain a piece like you describe, avoid working it and save the trouble. But more likely, you may be required to shape it. In such case, I recommend a table sander and a bandsaw. TS
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Unsapien Senior Member Offline "Sling your words like cannon balls."Vari, M.Twain Posts: 304 Davis, Ca Gender:	Re: Pocket Clip Sling Grip Reply #35 - Mar 23^rd, 2006 at 11:45pm I've been thinking on the swivels you added. Two questions: 1) Do they untwist the thongs when placing a stone, or while casting? 2) How freely do they swivel? -Unsapien
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CanDo Interfector Viris Spurii Past Moderator Offline Posts: 1652 New England, USA Gender:	Re: Pocket Clip Sling Grip Reply #36 - Mar 24^th, 2006 at 12:13am are those the type of swivels you'd find at a tackle shop?
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Dale

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Re: Pocket Clip Sling Grip
Reply #37 - Mar 24^th, 2006 at 1:49am

Well, since you ask ...

I decided to try adding swivels to a couple of my slings, to reduce my perennial problem with twisted cords. I found swivels at a sporting goods store, in the fishing department. Lots of different kinds of swivels. Barrel swivels. Snap swivels. Ball-bearing snap swivels. OK, they are cheap, I bought a few of each kind and went home to play with my new toys. Since I was experimenting, I left the barrel swivels in the bag and just used snap swivels. Barrel swivels have rings on both ends, and are for "permanent" attachment. Snap swivels have one ring and one spring clip.

I removed the pouches from several of my slings, and attached the ring end of a snap swivel to each end. Then I tied loops in the ends of the cords. Now I can use the same set of cords, and snap them onto any pouch I like!

The regular snap swivels work very well. No more problems with twisted cords.

The ball-bearing snap swivels taught me that there can be such a thing as too little friction! The pouch just dangles at the end of the cords and twists back and forth, back and forth ... if I don't wait for it to stop twisting, or reach down and stop it, I risk releasing while the cords are twisted around each other, which would probably cause the rock to not release. Bad for the shins, or other parts of my anatomy.

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« Last Edit: Sep 14^th, 2006 at 3:47pm by Dale »

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Yahweh Bless you in Yeshua

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Re: Pocket Clip Sling Grip
Reply #38 - Mar 24^th, 2006 at 2:43am

Good points, Dale.....I would also point out that the common 'Cow hitch' knot enables one to make use of the barrel swivel (shown at the start of the thread) in an easily removable fashion in order to switch pockets.......for instance, in a couple minutes, one can go from a split pocket to a shot pocket.

I know what you mean about ball bearing swivels. Never had much use for them!

CanDo, yes you can get them at any tackle shop. In fact, the tackle supply shops are one of a slinger's best friends!

TS

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person3 Senior Member Offline Posts: 276 maryland Gender:	Re: Pocket Clip Sling Grip Reply #39 - Mar 24^th, 2006 at 7:49pm Is anyone wondering what the dvd is abought? ???
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Taiki Interfector Viris Spurii Offline Don't tell my mom i'm here will you... Posts: 1255 belgium Gender:	Re: Pocket Clip Sling Grip Reply #40 - Mar 24^th, 2006 at 7:52pm Slinging naturaly
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SlingWolf Senior Member Offline Guns dont kill people... Magic missles do! Posts: 362 Kenmore, NY Gender:	Re: Pocket Clip Sling Grip Reply #41 - Mar 25^th, 2006 at 9:29pm Gee who would have guessed?
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Taiki Interfector Viris Spurii Offline Don't tell my mom i'm here will you... Posts: 1255 belgium Gender:	Re: Pocket Clip Sling Grip Reply #42 - Mar 26^th, 2006 at 10:51am Quote: Gee who would have guessed? Looool
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SlingWolf Senior Member Offline Guns dont kill people... Magic missles do! Posts: 362 Kenmore, NY Gender:	Re: Pocket Clip Sling Grip Reply #43 - Mar 27^th, 2006 at 10:32am
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Dale

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Re: Pocket Clip Sling Grip
Reply #44 - Mar 27^th, 2006 at 7:43pm

I want to go back to those snap swivels, and figure out if they'll be safe to use. I need somebody to check my math...

NOTE ADDED LATER: Umm, there are some mistakes in the calculations below. Do not trust them! When I get time, I'm going to re-do this, but for now all I have is time to add this warning.

MORE NOTES ADDED STILL LATER: "I thought I was wrong once, but it turns out I was mistaken." My calculations are correct. My friend with a Master's in physics, confirmed I did this right. However, I had made some initial mistakes and corrected them without fixing the changed numbers in a couple of spots. Fixed those numbers, and everything below is now correct and consistent.

OK, I've got a four-ounce rock, that's a quarter pound. My arm is about two feet from shoulder to hand, and my sling is three feet from pouch to grip. Whether doing an Apache style or a figure-8, I'm going to guess that my sling is doing about ten revolutions per second at release (if I could keep it swinging that fast for a whole second...). That guess is based on timing several videos, and seeing how much the sling moved between two frames. Twenty frames per second, as near as I can tell, and the sling moved a half-revolution from one frame to the next.

Centripetal force is calculated as F = v²/r. Velocity can be estimated from the circumference of the circle my sling is moving in (C = 2*pi*r), divided by the time for one revolution. So v = 2*pi*r/t. Plug that back into the force equation and simplify, and we get: F = m*r*(2*pi/t)²

Plug in the numbers:

m	=	0.25 pound
r	=	5 feet
t	=	0.1 second
pi	=	3.14159265358979323846 (approximately)

And I get a centripetal force of about 4935 ft-lbs/sec².

The force of gravity is 32.2 ft/sec², so divide that into 4935 and I get the effective "weight" of my rock, just when I release it: 153 pounds (for a four-ounce rock!).

Something seems wrong here.

(It may seem wrong, but it is actually right.)

The force pulling on my finger is equivalent to hanging a 150-pound weight from that finger?

(Yes; and a six-ounce rock will pull with a force of 230 pounds. Damn English measurement system. What idiot decided to use "pound" as a name for a unit of mass AND a unit of force??)

Of course, that force is only for a small part of a second...

But it sounds like my 70-pound snap swivels might not take the strain.

(I think I had best buy some heavier snap swivels -- I am quite glad that I have only been slinging tennis balls and snowballs so far.)

Could somebody check my math? My neighbor's windows stand at risk if I bust one of the swivels...

(Yeah ... some 200-pound swivels ... that should be good enough.)

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« Last Edit: Mar 28^th, 2006 at 7:12pm by Dale »

No, I don't live in a glass house.&&&&"If builders built buildings the way programmers write programs, then the first woodpecker that came along would destroy civilization."&&&&Context matters! "Nothing but net" is a BAD thing in tennis...

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