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SAL (Slingshot Arrow Launcher)


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Old 06-23-2017, 06:40 PM   #1
StKaaz
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Default SAL (Slingshot Arrow Launcher)

Posted a recycled crossbow a while ago and it needed improvement. The look, the power.... not good enough and way to shabby!

So i been working on some prototypes and came up with this Slingshot Arrow Launcher (SAL).Looks allot better and shoots like a gem. Accurate up to 50 meters with 86 centimeter bolt tipped hollow steel arrows (146 grams). Muzzle loaded (working on a version with auto-loader). 3x2 theraband blue tubes clamped on a frontplate with hemp cord to tie the rubber together. Nylon string with a selftightening knot on both sides, extra hemp cord to tie off the rubber. Total lenght of SAL is 125 centimeters, two handles for stability and no fingertips scraped by the string when released.

Forgot to take a picture before glueing everything together, so i'll explain the trigger system. Its a round stringholder with two notches, one for holding the string and one for the trigger to hold it in cocked position. The stringholder is being pulled back by a spring and nylon cord, so it doesn't bounce back into locked position after fireing. When you cock the weapon the trigger slides forward and keeps the stringholder in place.


Attached Images
File Type: jpg Slingshot Arrow Launcher (SAL).jpg (254.8 KB, 21 views)
File Type: jpg SAL tube clamp.jpg (230.0 KB, 19 views)
File Type: jpg SAL trigger uncocked.jpg (229.5 KB, 19 views)
File Type: jpg SAL trigger spring.jpg (238.7 KB, 20 views)
File Type: jpg SAL stringholder spring.jpg (268.7 KB, 21 views)
File Type: jpg SAL cocked.jpg (318.3 KB, 21 views)
File Type: jpg SAL stretched tubes.jpg (280.0 KB, 21 views)
File Type: jpg SAL string rubber attachment.jpg (259.7 KB, 22 views)
File Type: jpg SAL 86cm 146gram arrow.jpg (227.8 KB, 23 views)
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Old 07-01-2017, 03:29 PM   #2
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Working on a second version of this with a rifle shape, Slingshot Arrow Launcher Rifle (SALR).

With the safety pal on the spot where you normaly cock the trigger on an old skool hunting rifle. Photo's show how the triggersystem works. Notice that the trigger is exactly in line with the release of the Arrow. Usualy see triggers that work with the finger below the mechanism and not behind it. Just a little thing that makes the design and woodwork so much fun!

Working on a faceplate for this right now. Different from the ones that one screws on the front, bit more estetics needed

Let me know what you think of it, i'm interested in your opinion and questions!


Attached Images
File Type: jpg SALR.jpg (228.9 KB, 18 views)
File Type: jpg SALR safety on locked trigger.jpg (223.8 KB, 17 views)
File Type: jpg SALR safety off locked trigger.jpg (231.0 KB, 18 views)
File Type: jpg SALR pulled no release trigger.jpg (209.2 KB, 18 views)
File Type: jpg SALR released trigger.jpg (215.0 KB, 18 views)
File Type: jpg SALR aiming.jpg (197.4 KB, 18 views)
File Type: jpg SALR open.jpg (223.4 KB, 18 views)

Last edited by StKaaz; 07-01-2017 at 03:34 PM.
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Old 07-01-2017, 05:42 PM   #3
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I really like your trigger mechanism! It looks so simple yet effective. How is the friction between the the parts? Is it easy to overcome? They look rather unpolished now, are you planning on doing that?
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Old 07-01-2017, 07:46 PM   #4
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Yeah the trigger mechanism is cool indeed.
With all the plywood this thing must be quite heavy.

Cool build.
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Old 07-02-2017, 06:41 AM   #5
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Quote:
Originally Posted by onnod View Post
I really like your trigger mechanism! It looks so simple yet effective. How is the friction between the the parts? Is it easy to overcome? They look rather unpolished now, are you planning on doing that?
Thanks!

There is very little friction between the parts. Sanded them with 240p sandpaper and the inside of the frame. It indeed looks like it hasn´t been sanded but it is.
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Old 07-02-2017, 06:48 AM   #6
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Quote:
Originally Posted by Knallfrosch View Post
Yeah the trigger mechanism is cool indeed.
With all the plywood this thing must be quite heavy.

Cool build.
Thanks!

Its made from popular tree plywood, fairly light wood. Both launchers weight about 1,5 kg each.
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Old 07-02-2017, 07:59 AM   #7
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I hope you make a blueprint. Woud be a awesome present for my uncel!
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Old 07-10-2017, 03:53 AM   #8
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I love that trigger mechanism! Inspired approach on the revolving nut trigger.
Does the safety engage automatically when the crossbow is cocked?
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Old 07-11-2017, 07:41 PM   #9
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Quote:
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I love that trigger mechanism! Inspired approach on the revolving nut trigger.
Does the safety engage automatically when the crossbow is cocked?
Thanks!

The safety does not automatically engage when the crossbow is cocked. This would be a something i could incorporate in a new project. Thanks for the tip thru questioning.


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