Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 66 users online :: 3 registered, 0 hidden and 63 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

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.
Sponsored 
  • Author
    Message

Unread postAuthor: suburban spudgunner » Wed Sep 09, 2009 8:07 am

JoergS wrote:I will be wearing a motorcycle helmet and protective gear all around. I am not THAT crazy.

The construction will be made out of steel 100%.

Jörg


I hope you'll be wearing a cup as well? All I can see is a slight slip of the band followed by a high-pitched squealing...

Ya gotta protect yer nuts!
  • 0

The definition of insanity is doing the same thing over and over again and expecting different results.
User avatar
suburban spudgunner
Staff Sergeant
Staff Sergeant
 
Posts: 124
Joined: Mon Jan 05, 2009 4:08 pm
Location: Oak Lawn, Illinois, USA
Reputation: 0

Unread postAuthor: Ragnarok » Wed Sep 09, 2009 9:24 am

That sounds like a pretty titanic effort to still only get the same energy as a .22 pistol.
Nonetheless, don't let me dissuade you from trying to do it...

JoergS wrote:If my calculations are right, the draw force (at 500% elongation) will be about 110 kilogramms (240 lbs).

I can't help but have a certain quote appear in my head:
"If my calculations are correct, when this baby hits 88 miles per hour...you're gonna see some serious s***."
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: JoergS » Wed Sep 09, 2009 2:01 pm

Ragnarok wrote:That sounds like a pretty titanic effort to still only get the same energy as a .22 pistol.[/i]


Well, the energy may be the same, but the stopping power of a lead ball in .91", flying at 200 km/h, will certainly be much superior to a .22.
  • 0


JoergS
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 468
Joined: Tue Aug 04, 2009 3:16 am
Reputation: 3

Unread postAuthor: jackssmirkingrevenge » Wed Sep 09, 2009 2:19 pm

JoergS wrote:Well, the energy may be the same, but the stopping power of a lead ball in .91", flying at 200 km/h, will certainly be much superior to a .22.


It would certainly be a formidable missile but the higher velocity and smaller frontal area of a 22 bullet would allow much deeper penetration, so in terms of lethality I don't think you could categorically say it will be superior against living tissue without appropriate testing.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: CpTn_lAw » Wed Sep 09, 2009 2:31 pm

And that is of course no problem because harming living tissue and talking about it is against forum rules.

He also said stopping power, not lethality. If I may add, a 140 grains 9mm parabellum has more stopping power than a 40 grains .22 WMR , for roughly the same muzzle energy (419 - 439 joules) .

So I guess, that Joerg is right. Stopping power will be higher, even if if doesn't penetrate as deep/at all.
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: JoergS » Wed Sep 09, 2009 3:30 pm

I think I have been very diligent in terms of appropriate tests.

Here are some examples:

[youtube]http://www.youtube.com/watch?v=B9lJ5FoXrek[/youtube]

[youtube]http://www.youtube.com/watch?v=ko1x5v_a85A[/youtube]

[youtube]http://www.youtube.com/watch?v=IBhCQLLTSHk[/youtube]

[youtube]http://www.youtube.com/watch?v=VTvBoNaokMk[/youtube]

Video's embedded by jrrdw.
  • 0


JoergS
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 468
Joined: Tue Aug 04, 2009 3:16 am
Reputation: 3

Unread postAuthor: POLAND_SPUD » Wed Sep 09, 2009 5:35 pm

wow.. that's really impressive
now about 'Slingshot vs. Coconut' vid... first of all, that's a nice pair of boobs :wink:

secondly, isn't that device considered as a trigger mechanism ??
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Sponsored

Sponsor
 


Unread postAuthor: Ragnarok » Wed Sep 09, 2009 9:15 pm

JoergS wrote:Well, the energy may be the same, but the stopping power of a lead ball in .91", flying at 200 km/h, will certainly be much superior to a .22.

On a one shot basis, I'd agree. But if we're extending the comparison beyond simply energy, that .22 pistol offers the opportunity for rapid follow-up shots, and quite a lot more practicality.

Even with that said, I'm still interested to see the results of your tests.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: THUNDERLORD » Wed Sep 09, 2009 9:35 pm

...and quite a lot more practicality....


Not necessarily:
legality, weight, simplicity, enjoyment (which is a matter of personal taste), cost, etc.,etc..

Besides (IMO), that's like comparing, IDK, tomatoes to bananas or such.
Two different things.
Similar (firearm etc.) comparisons could be made about many spudguns but it's not really merited IMO. :?

BTW, Hope to see a vid of the test! 8)

EDIT: Little perturbed my entire reply with (spam) I saw yesterday got ...earlier. :( :? :roll:

Edited by jrrdw.
  • 0

-----SPEED,STRENGTH, AND ACCURACY.-----
"Procrastination" is five syllables for "Sloth".
Theopia 8)
Born To Be Alive!

THUNDERLORD
Major General
Major General
 
Posts: 1264
Joined: Fri Mar 28, 2008 1:42 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Sep 10, 2009 12:10 am

CpTn_lAw wrote:And that is of course no problem because harming living tissue and talking about it is against forum rules.


This is a purely academic discussion as opposed to "omg I shot the neighbour's cat with my spuddy haha!" so no harm there.

He also said stopping power, not lethality. If I may add, a 140 grains 9mm parabellum has more stopping power than a 40 grains .22 WMR , for roughly the same muzzle energy (419 - 439 joules).


If the 9mm is FMJ and the 22 is a hollowpoint, that would probably even out

So I guess, that Joerg is right. Stopping power will be higher, even if if doesn't penetrate as deep/at all.


The problem is defining "stopping power". Imagine getting hit by a bullet from an AK while wearing a bulletproof vest, all that kinetic energy is transferred to you (over 2000 joules) but it certainly won't kill you and might not even knock you down. A 22LR bullet with around 5% of that energy hitting you in the heart will definitely stop you. With a complex target like living tissue, shot placement is critical.

According to the FBI:

Kinetic energy does not wound. Temporary cavity does not wound. The much discussed "shock" of bullet impact is a fable and "knock down" power is a myth. The critical element is penetration. The bullet must pass through the large, blood bearing organs and be of sufficient diameter to promote rapid bleeding. Penetration less than 12 inches is too little.


JoergS wrote:I think I have been very diligent in terms of appropriate tests


Acknowledged and appreciated, so looking forward to your results for this one :)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: JoergS » Thu Sep 10, 2009 1:36 am

Guys, this thread is going in the wrong direction. I want to perform a perfectly safe attempt to break a record for slingshots, with no harm to anything except a heap of towels as a backstop, and here we are discussing penetration into human flesh.

I am afraid that this threat will be closed by the admins if we go on, so please come back to the topic.

Jörg
  • 0


JoergS
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 468
Joined: Tue Aug 04, 2009 3:16 am
Reputation: 3

Unread postAuthor: jackssmirkingrevenge » Thu Sep 10, 2009 1:45 am

You brought "stopping power" into the equation but granted, lets stick to velocity and weight measurments and energy calculations ;)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: CpTn_lAw » Thu Sep 10, 2009 3:53 am

No probs, and ...GOD JSR, your argumentation was good.... :D

Nice vids Joerg, really looking forward to seeing your end product, or simple prototype, or whatever material you have concerning it :P
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: JoergS » Sat Sep 12, 2009 11:51 am

Made it!

56,64 Meters per second (185,5 fps) with the 82 gramms (1312 grains) .91 lead ball!

That is 131,53 Joules of energy.

I think I am the current world record holder for portable one man operated slingshots.

The video will follow.

Hooray!

Image
  • 0


JoergS
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 468
Joined: Tue Aug 04, 2009 3:16 am
Reputation: 3

Unread postAuthor: jackssmirkingrevenge » Sat Sep 12, 2009 11:54 am

Fork in hell! Is the rig bolted to the ground as well or held only by your feet?

Any ballistic gelatin tests to follow? :)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

PreviousNext

Return to Non-Spudgun Related Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'