Logic Bow


UPDATE: The concept behind The Logic Bow (put simply so everyone can understand)
By using a ratchet system to hold the bands behind the pin you can:
@ Decrease pin friction in barrel
@ Increase pullback distance
@ Increase power
@ Make the pin easier to pullback
@ Have a simple rail system

I have now uploaded a clip of the firing system in action for those of you who don't understand how it works

This is a pin type gun, not a slingshot. It uses a ratchet system to hold the rubber bands, therefore increasing the amount of bands that can be used and increasing ease of pullback. These bands are released when the trigger is pulled, propelling the pin into the bullet. This means that the effective pullback distance is increased, therefore increasing the range and power.

well here is the first "new thing" I have done in ages, (the last Truly innovative thing I built was the D-Frag grenade) the Logic Bow. It uses an all new 4-stage firing system that runs between two rails (I tried using a dual rail system but that didn't work out). So far I have the mech working, but it needs the rest of the body, the bow, a handle and probably a stock. It is a single shot that should have more power than a pin gun, the really cool thing about it is that although it uses a pin mech the pin takes almost no effort to slide back.

I will keep you updated as the project progresses, Feel free to ask any questions.

Update: I finished the entire gun and uploaded a couple of pics (see below)

This will soon be posted.

Picture of Logic Bow
sort by: active | newest | oldest
An Villain6 years ago
How Very Logical.
DJ Radio6 years ago
This isn't really different from the concept on LT. Licorice.  And I liked it better because it had a mag.
Fred the Penguin (author)  DJ Radio6 years ago
wrong. lt lic has two rails, this has one, it uses a slide, this uses a pin, lt lic's trigger blocks the pin, this uses a ratchet system. this gun it designed to increase the power of a ram gun. Anyway I prefer single shot as they are completely reliable.
So you basically admit this is a LT. Licorice downgrade.  2 rails>1.  That gun also uses a pin, but it's slid down the barrel, like yours.  LT Licorice's trigger is a sear system, it does not block the pin at all, rather holds it back like yours.  Lt. Licorice is extremely reliable as well.
Fred the Penguin (author)  DJ Radio6 years ago
No. 1 rail means half the friction, this is not like Lt licorice. It is an entirely new ratchet pin system. Also this uses a true pin that stays attatched to the barrel. there is also no system to hold back the loser bow's pin.
So this is no different from a regular ram gun, namely my SR commando, concept-wise.  You basically just made a sear system which has an already-done concept.
Fred the Penguin (author)  DJ Radio6 years ago
no. a sear trigger holds the ram, a ratchet system holds the bands. this is not like your sr commando.
The SR Commando was a new kind of sear trigger, a ratchet sear.  The SR commando held the pin back by holding the rubberbands back.  Take a good look at its mech sometime.  
Fred the Penguin (author)  DJ Radio6 years ago
yes but the bands are connected to the firing pin, this system holds the bands back, they are released and then hit the pin to start accelerating it into the ammo.
How does that make it any better?
Fred the Penguin (author)  razzlekunai6 years ago
It increases power and ease of pullback
Sounds like not true. 8|
Fred the Penguin (author)  razzlekunai6 years ago
It iz twoo.

Prove it.
Fred the Penguin (author)  razzlekunai6 years ago
what guns do you currently have? a TR? try sticking 5 #64 bands on it. How easy is the pin to pull back? On the Logic Bow you can pull each band back one at a time before you pull back the pin. Also seeing as the ratchet is behind the pin the bands gain speed before the pin even starts moving.
This means you get increased power from the same amount of bands.

I had a TR. Had 5 bands on it.
Easy to pull back.
I had a flipmag. Had 7 bands on it.
Easier to pull back than the TR.
Fred the Penguin (author)  razzlekunai6 years ago
did you use 64's or POS bands and were you using a full pullback or a shorter one?
No, he's telling the truth. I currently have 6 new, quality bands on my MeZak, and it gets like 80 ft. flat.
Fred the Penguin (author)  travw6 years ago
um reply to the pony
Pony > penguin
Fred the Penguin (author)  razzlekunai6 years ago
My little pony > Penguin with Gattling gun, You'd be ripped to shreds.
"My little pony > Penguin with Gattling gun"
Aha, so you admitted it
LOL. I didn't notice that!
My little pony with MeZak > Penguin with GOP25, or GOP18, or GOP8.
Fred the Penguin (author)  travw6 years ago
this is an avatar battle, not a knex war.
Well your avatar has a gun, I figured it was only fair to give his one.
Fred the Penguin (author)  travw6 years ago
he said pony > penguin, I made the equation correct.
Fred the Penguin (author)  travw6 years ago


Are you asking me to answer the question you asked Razzlekunai?
In that case,
1. Already answered that. Quality bands.
2. It's a very long draw. Just go make a MeZak, it doesn't use many pieces or anything...
64s, little boi.
There's only one set pullback on both guns I mentioned, idunno what you mean by shorter pullback
Fred the Penguin (author)  razzlekunai6 years ago

W/E, I am not little, I'm like 5'9

Build it.
You can use a repeater as a single shot too...
Fred the Penguin (author)  TheDunkis6 years ago
but it will not be as powerful as a true single shot
How so?
Fred the Penguin (author)  TheDunkis6 years ago
a repeater typically does not have the same pin distance as a single shot, (sorry bad explanation) in a single shot the pin only just hits bullet, traveling maybe 2mm past the point of impact, a repeater needs more of a push to get the bullet out of the mag, or to release the bullet from the turret, the exception to this are bolt actions like the FSSR or AR4. also single shots are a lot more reliable.
ZKAR also does what you said, it hits the ammo right where the pin stops.
Fred the Penguin (author)  DJ Radio6 years ago
they were the first two I thought of, and it is harder to muzzle load the ZKAR, come to think of it the FSSR-C is the only bolt action gun that can be effectively muzzle loaded....
But the ZKAR has a better bullet lock than both of ours.
Fred the Penguin (author)  DJ Radio6 years ago
try muzzle loading the zkar......
I think I'm gathering even more ideas to making a better assault weapon.
I just got a thought for a combination gun.

Slignshot + Side-loading, removable-mag, ram gun.

...Why not just give a slingshot a magazine?
That works even better. :D
Fred the Penguin (author)  TheDunkis6 years ago
Good to hear dwinkles
Don't address me by that. I don't care for the nickname.
Fred the Penguin (author)  TheDunkis6 years ago
yes maam
Do you like being annoying or something?
Fred the Penguin (author)  TheDunkis6 years ago
yes. I do.
I've built the BR and a KKC, they get equal power. 
I know that.... but this doesn't have a mag or turret. 
Then make Lt. Licorice a single shot.
And in case you didn't realize it, it's an Oodammo mag.
Fred the Penguin (author)  travw6 years ago

yes I know that. I am uploading the clip of the firing system now

travw6 years ago
I don't like that you can't just pull back the ram.
Fred the Penguin (author)  travw6 years ago
Its a hybrid gun, the main thing that I do not like about pin guns is pulling back a pin loaded with 1000 bands, this solves that problem, you can load all the bands one at a time, easily slide back the pin, load a bullet and watch your friend yell in pain when you shoot him, oh you should also recognise the chair from the gop vid.
Fred the Penguin (author)  travw6 years ago
this is the first gun of its kind, did you know that?
Itnot. No.
Fred the Penguin (author)  travw6 years ago
prove it.
Ok, technically, the rail+ratchet mod hasn't been done, but both separate things have been done.
Fred the Penguin (author)  travw6 years ago
Its a ratchet pin gun, as far as I know this has Never been done before
But things with the same concept, and better performance have.
Fred the Penguin (author)  travw6 years ago
this concept was to use a pin but increase power without making the pin impossible to draw back. Lt Licorice and other similar guns like the sexbow do increase power, but they are not true ram guns and if you use more bands the pullback becomes harder.
"Lt Licorice and other similar guns like the sexbow "
"but they are not true ram guns"
How are they not ram guns?
Search Lt. Licorice on Youtube.  It has the same concept, but it's mag fed unlike yours, and has no bow.
Fred the Penguin (author)  DJ Radio6 years ago
read my reply to your other coment
I think that pulling back 5 rubberbands is same as pulling back a pin.  On my SR Commando, you pulled back the pin by grabbing the rubberbands, then you hook them on the ratchet.  Mine was better since you pulled the pin and the bands back at the same time.  
Looks pretty good.....
Fred the Penguin (author)  shadowninja316 years ago
sprout_less6 years ago
 if you still have to pull back rubberbands why is it so eaasy to pull the ram
Fred the Penguin (author)  sprout_less6 years ago
You can pull the bands back one at a time, there are no rubberbands attached to the ram. Look at the video.
 yes but you still have to pull them back.
Fred the Penguin (author)  sprout_less6 years ago
but you can pull them back individually
 Ok whatever, it's decent
Lowney6 years ago
Cool, nice one. I had an idea for this kind of thing too, but I turned it into my mag-fed crossbow.
Fred the Penguin (author)  Lowney6 years ago
thanks, I am going to post this once I get it perfect
I think most decently skilled knexers could build this anyway.
Fred the Penguin (author)  travw6 years ago
Then build it.
If so, I'll make it a couple sections longer. =)
Fred the Penguin (author)  travw6 years ago
I tried making it longer, 64's didn't work as well so I reverted it.
Yeah, I guess. Oh well.
Fred the Penguin (author)  travw6 years ago
you could just use bigger bands....
Well, I only have 3.5 inch bands, and 7 inch bands. And I don't really want to have a barrel twice that large.
Fred the Penguin (author)  travw6 years ago
of course not, the gun is already on the long side.
Yeah I you mentioned that to someone else. A mag perhaps? I know this would be odd because it has long reload times but hey.
Fred the Penguin (author)  Lowney6 years ago
The thing is I find repeaters a liability in battle, sure you can fire howevermany shots you have at a relitively high rate, but then you are stuck reloading them, single shots do not have this problem, therefore while you are rewinding your tr18 turret or refilling your oodammo mag, I am firing sniper rods at you from over 40m away (120 feet)
Or while you pull ammo out of your pocket and try to stuff it in the barrel, I get a gun capable of rapid fire, run up, and rush you.  My Jackal only takes about 5 seconds to reload a new mag.
Fred the Penguin (author)  DJ Radio6 years ago
while you are running up to me I can probably fire 2-3 shots at you before you are in range, then I pull out a GOP25 and nail you with my superior ammo capacity.
120 feet requires a miracle to hit someone.  You can't be that accurate even with a slingshot gun.  I'd just duck and dodge until you run out, then when you take 5 minutes to reload, I slam a new clip in and rush you.
Fred the Penguin (author)  DJ Radio6 years ago
actually it takes me under 10 seconds to reload. Also you pistol has a range of 50 feet, I could easily pick you off from 70. also you are forgetting about my side arm which has a range of roughly 15m, this is less than your pistol but if you stay at that distance I can still easily pick you off with loser bow and dodge your bullets, sooner or later I am going to hit you.
I can get more range with my pistol, I just only have 2 bands on.  You can't really pick me off from 70 feet, that would seem like a long range with lucky shots involved.  At a longer range, I'll use a bigger assault rifle, not the pistol.  I'd just run in and rush you when I was close enough.
You two remind me of little 10 year olds play the imaginary I win game. Repeaters win wars. You simply cannot hit people at far range. K'nex aren't accurate enough or fast enough. I would say shotguns are probably the best weapons for war however it's hard making them. I think I might revive my old shell concept for the Oodast. I'm pretty sure that the MeZak or maybe the Oodast would be your best choice. You can easily reload them with clips and you can pick up rounds off the ground and quickly add them to the magazine.
You CAN hit someone at long range, but that takes a little bit of luck, and a fat/slow opponent.
Fred the Penguin (author)  DJ Radio6 years ago
Especially if you have guns like the LB that fire their bullets faster than ordinary guns.
Slingshots can fire even faster than LB.  If it was up to me, Id use a rectangle or the OMEN as a singleshot.
Fred the Penguin (author)  DJ Radio6 years ago
LB actually has a faster bullet velocity than many slingshots. The thing is that this is not a gun that I would recomend for war, it's a working prototype for goodness sake!
Fred the Penguin (author)  TheDunkis6 years ago
Maybe I should have posted the TFSSG, that thing was awsome.
travw6 years ago