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The Slingshot Channel Thread

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
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Unread postAuthor: JoergS » Mon Oct 25, 2010 4:24 am

The 3D version is viewable as well, here:

http://www.youtube.com/watch?v=c_CbymYAtRc

To enjoy the video in 3D, you need to have cardboard paper glasses or use the "crossed eyes" method. Adjust the 3D playback method in the youtube player under "3D".

If you own a 3D TV, download the side-by-side video to a USB thumb drive or SD card, then plug it into your TV and you will have a blast.

Jörg
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Unread postAuthor: Zeus » Wed Oct 27, 2010 5:20 pm

I'm quite curious about the mechanism, I can't watch videos, low download limit, is there maybe a schematic, unless of course you have patent pending.
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/sarcasm, /hyperbole
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Unread postAuthor: JoergS » Wed Oct 27, 2010 10:18 pm

I really don't have any schematics, built it right out of my head.

The mechanism is as simple as can be, basically the trigger is an L-shaped piece of wood with a nock that protrudes upwards.

I recommend using an internet café or a friend's PC. The mechanism becomes quite clear in the video.

Jörg
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Unread postAuthor: JoergS » Mon Nov 01, 2010 5:49 am

Have made another version of my slingbow. This time, upon many requests, I did a tutorial video as well.

I have devised a home made arrow rest, using rubber (what else). Also, I set the rest far back to gain draw length. Then, I designed the "frame" in a way that armslaps can never happen.

The bow is entirely made from 12 mm and 19 mm plywood, with three screws to stabilize the weapon.

It is more bulky, but also a lot more powerful than its predecessor.

Made this on Halloween, so I just had to shoot at a coconut... penetrated both sides. With a field tip.

Here are some screenshots from the video:

Image

Image

Image

Image

Image


The slingbow weighs 550 gramms (1,2 lbs), ready for shooting.

Here are the blueprints:

https://docs.google.com/fileview?id=0B2 ... YWIw&hl=en

Here is the video:

http://www.youtube.com/watch?v=oz3ruRsh-HY

Jörg
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Unread postAuthor: Ragnarok » Mon Nov 01, 2010 1:45 pm

I have one worry. Because of that draw length extension, your forward hand is ahead of the arrow while it's drawn back, and the arrow is flying alarming close to it. While perhaps unlikely, there's always going to be a risk of someone putting an arrow into their own hand.

You might be okay with the risks, but to my eye a misplaced thumb could quite easily get either speared or cut by passing fletching.

My suggestion would be to have some form of shield for the hand - either a piece of wood that would stop anyone putting their hand too far up the grip, or possibly a piece of pipe that the arrow flies through until it's gone past.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: JoergS » Mon Nov 01, 2010 2:21 pm

Yes, I considered that and there is enough room for a "bridge" that protects your hand. A tube does not work so well as you can't see how much more you can draw out.

But you would have to draw in a crazy angle to hit your hand.
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Unread postAuthor: Ragnarok » Mon Nov 01, 2010 4:27 pm

JoergS wrote:But you would have to draw in a crazy angle to hit your hand.

Yes, but in the event that your grip slipped or was misplaced, it's something that could happen.
Unlikely, I'll admit, but my personal rule is to keep as wide an angle in front of the "muzzle" free of anything you don't want to hit as possible.

Either way, it's a nice design, and I'm considering making one myself - with a little more protection for the front hand though.
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Does that thing kinda look like a big cat to you?
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"The Sling Room" - my slingshot collection

Unread postAuthor: JoergS » Mon Nov 08, 2010 1:15 am

It was raining cats and dogs today, so no outside video. But since many people asked me how many slingshots I own and which one is my favourite, I made a video showing my slingshot room.

57 of my best slingshots (I have hundreds) are kept on permanent display, most of them made by myself, but also a good dozen of the best types given to me by fellow slingshot makers.

http://www.youtube.com/watch?v=l6c0XeOCZQg

Enjoy!

Jörg
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Unread postAuthor: JoergS » Mon Nov 08, 2010 6:32 am

Have reviewed the Target Master slingshot. A very old school design with great functionality!

Here:

http://www.youtube.com/watch?v=P1up1TX2ATI

The 3D version can be found here (cardboard glasses required):

http://www.youtube.com/watch?v=fGYS3pdh3rQ

Hogancastings charges 45 British Pounds for the masterpiece, plus P+P. You can contact them via email, hogancastings@hotmail.co.uk

Jörg
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Unread postAuthor: boyntonstu » Mon Nov 08, 2010 7:40 am

You have made more progress in slingshot design than anyone else that I am aware of. Bravo!
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Unread postAuthor: Selador » Mon Nov 08, 2010 11:15 am

JoergS wrote:Yes, I considered that and there is enough room for a "bridge" that protects your hand. A tube does not work so well as you can't see how much more you can draw out.

But you would have to draw in a crazy angle to hit your hand.


Maybe a good compromise would be to make your bridge, a half-pipe ?
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If you can't fix it, you don't own it.

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Unread postAuthor: Selador » Mon Nov 08, 2010 1:30 pm

JoergS wrote:
qwerty wrote:Very cool but how are you going to clean up those glass shards? :wink:


I have two helpers: A wife and a broom.


Your wife hands you the broom ?

:wink:
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"Pygmalion" - the taming of a natural fork

Unread postAuthor: JoergS » Sun Nov 14, 2010 4:34 am

OK, I have never presented a natural fork so far. The reason is that it is hard to find a natural that has a low and wide enough fork, which is what I prefer.

A friend of mine challenged me to make a "Phoenix" design from a natural, and I accepted.

This is the outcome:

Image

Yes, it is a natural fork. It doesn't look like a natural at all, right?

Here is where I started from. Real big, but with the typical narrow fork that doesn't work well for me. But enough "meat" to carve it to my liking. I don't know which wood it is, bark and leafs look like beech, but the trees have nasty thorns.

Image

Next, I removed the bark and properly microwaved it.

Image

Then I cut of the fork arms and changed the angle on the handle. I drilled in 8mm holes and bend 8 mm threaded rods so the angle is just right.

Image

Glued everything together with epoxy.

Image

Took the rasp. 90 minutes later, the rough shape was done.

Image

Then the sanding job.

Image

Several layers of black spray paint, to de-naturalize it further.

Image

Then sanding with very fine sandpaper to achieve the plastic-like sheen:

Image

A very strong slingshot, perfect weight and fork dimensions.

Jörg
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Unread postAuthor: Mpeddlesden » Sun Nov 14, 2010 5:29 am

dont know if it means' much but this is my sling shot which has been sitting in my dad's Locker for 10-15 year's not I bough some new rubbers for it from a hunting shop And though i should put it up.


<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=sidewithpouch.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/sidewithpouch.jpg" border="0" alt="Photobucket"></a>

<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=front.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/front.jpg" border="0" alt="Photobucket"></a>

<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=ballbearing.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/ballbearing.jpg" border="0" alt="Photobucket"></a>
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Review: "Liberty I" compact compound bow vs. Slin

Unread postAuthor: JoergS » Sun Nov 14, 2010 5:55 pm

The slingbow is a very popular weapon as it is compact, lightweight, easy to make and can shoot hunting arrows. But it competes with small bows, such as the "Liberty I" by Howard Winthers from www.libertyarchery.com.

This video presents the "Liberty I" bow and compares it to the "Diamond Razor Edge" compound bow and the homemade slingbow (see the How-To on The Slingshot Channel).

The results are quite impressive, the small Liberty I shoots a 400 gr arrow at more than 310 km/h. It outperforms the larger Razor Edge and of course also the slingbow (made with materials for under 10 dollars).

Slow Motion scenes recorded at 1200 frames per second show the behaviour of the bow when shot, it stays amazingly calm.

[youtube]http://www.youtube.com/watch?v=1aP_gKlQd-s[/youtube]

Jörg
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