Slinging.org Forum - Compound sling-Whip analogy

Welcome, Guest. Please Login

Slinging.org Forum › General › Here Be Maths... › Compound sling-Whip analogy

(Moderators: woodssj, joe_meadmaker, Rat Man)

‹ Previous Topic | Next Topic ›

Pages: 1

Compound sling-Whip analogy (Read 215 times)

Sarosh

Interfector Viris Spurii

Offline

Posts: 1183

Compound sling-Whip analogy
Feb 16^th, 2019 at 4:14am

Understanding the whip better will help with the making of the compound sling.
Compound sling would be like a form of whip with discrete mass distribution, instead of the whip's continuous decrease of mass per unit of length. (digital and analogical designs of the same thing)

In order to find the booster : projectile mass ratio and lengths ratios for the c.sling it would be a good idea to understand what kind of tapering works in whip better/efficiently.

1)what is considered optimal whip tapering ?
we want a compact design so we are going for the shortest tapering possible but still working
please share articles, videos ,experience etc..

2)which one is conserved in the whip. The kinetic energy or the momentum? kinetic energy is what we can measure.Are the losses to friction or other forms of energy big enough so that the KE is lowered and we can't use it as a constant?

https://www.youtube.com/watch?v=AnaASTBn_K4
@ 6:58 he mentions conservation of momentum.
take a look at the pic below @ conservation of momentum between a 1kg booster and a 100g projectile is impossible, 4.3kJ are missing. what is going on?

in the ideal compound sling the booster mass will come to a stop and momentum/energy will be transferred all at the projectile mass like the whip does on the vid.

edit: Compound sling : http://slinging.org/forum/YaBB.pl?num=1174772635/0

kepcons.png (4 KB | 20 )

IP Logged

Mersa Interfector Viris Spurii Offline Druid Posts: 2615 Australia Gender:	Re: Compound sling-Whip analogy Reply #1 - Feb 16^th, 2019 at 5:03pm There is a lot to read, some 15 pages , I'll have to have a little more free time to really apply myself to this one. Good to see someone trying to continue the experiment but . Good work sarosh
Back to top	Razor glandes, Aim for the eyes!!! IP Logged

Mersa Interfector Viris Spurii Offline Druid Posts: 2615 Australia Gender:	Re: Compound sling-Whip analogy Reply #2 - Feb 16^th, 2019 at 8:46pm After a quick skim read all I can think of is the murlin trebuchet
Back to top	Razor glandes, Aim for the eyes!!! IP Logged

Sarosh Interfector Viris Spurii Offline Posts: 1183	Re: Compound sling-Whip analogy Reply #3 - Feb 17^th, 2019 at 1:44am it looks like a trebuchet motion. the problem is i can't see what ratios, arm lengths etc in trebuchet correspond to in the c.sling. so it might help in a qualitative way (how the movement should look to be efficient) but not in a quantitative way.
Back to top	IP Logged

Curious Aardvark past-administrator Offline Taller than the average Dwarf Posts: 13965 Midlands England Gender:	Re: Compound sling-Whip analogy Reply #4 - Feb 18^th, 2019 at 2:44pm *This Topic was moved here from General Slinging Discussion* by Curious Aardvark.**
Back to top	Do All things with Honour and Generosity: Regret Nothing, Envy None, Apologise Seldom and Bow your head to No One - works for me IP Logged

NooneOfConsequence

Slinging.org Moderator

Offline

Posts: 2993
Texas

Re: Compound sling-Whip analogy
Reply #5 - Feb 22^nd, 2019 at 8:40am

The compound sling, like all slings should be thought of as a transmission system. Muscles are strong but slow; effective penetrating projectiles should be relatively light and very fast... thus the sling converts strength into speed. To oversimplify, a standard sling is like a single gear ratio, and a compound sling is two gear sets. You get a multiplicative effect from the second sling. The middle mass acts as an impedance matching mechanism to more efficiently convert strength into speed through the more complex transmission system. A whip sling would be something akin to a continuously variable transmission I suppose, and it would be particularly good for throwing very lightweight projectiles like bb’s... probably well above the speed of sound.

The reason you can’t transfer 100% of the momentum from a 1kg mass to a 100g mass is that you need a 10:1 “gear” to match the 10:1 mass ratio. You could do that in a whip with a continuous conversion but a compound sling does it all at once in the second stage of your transmission system. Try either a heavier projectile or a lighter middle mass with practical sling lengths.

“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler

IP Logged

Curious Aardvark past-administrator Offline Taller than the average Dwarf Posts: 13965 Midlands England Gender:	Re: Compound sling-Whip analogy Reply #6 - Mar 6^th, 2019 at 7:19am somewhere there is a video of matthias with a working compound sling. I invented the concept and he made a working model shortly after. Someone else copied it and got it working. unfortunately both just vabnished from the forum one day and haven't been seen since.
Back to top	Do All things with Honour and Generosity: Regret Nothing, Envy None, Apologise Seldom and Bow your head to No One - works for me IP Logged

Pages: 1

Slinging.org Forum › General › Here Be Maths...

‹ Previous Topic | Next Topic ›

(Moderators: woodssj, joe_meadmaker, Rat Man)