Introduction: Red Impact - Perfect Duck's K'nex Gun.

Mid-size, light-weight, sturdy and easy-to-use repeater. I can fire five red rods in a 10-second video. Holds 18.

It fires via weighted impact (typical) and features recoil dampening and minimal-friction loading systems not seen elsewhere. My entrant to any applicable K'nex gun contests.

A few exotic parts were used, firstly a metal spring that fits around a K'nex rod. Also, to make this, you will need to mutilate three dark grey connectors by cutting off their tops (remove half of the circle). Though you could get the spring at any hardware store, you can use rubber bands in its place.

Step 1: -back End- the Pile Driving Shaft.

Essentially, you're just building a sturdy hole through which the firing force of the gun passes through. It doesn't have to be exactly like mine, but what is shown optimizes on strengh and keeping out of the rubber bands' way. If you are a diehard fan of the orange connector type blocking trigger like in KILLERK's, go ahead and incorporate one near the bright-red connectors. I prefer pull-release, it's faster.

On the SPRING - it is extremely effective to use one here. You can get springs like these that wrap around K'nex rods at hardware stores (best bet) or from hobby stores (remote control cars) This is how the power is converted.

GREY ROD + ORANGE CONNECTOR -> BLUE ROD -> RED ROD (Projectile)
(Several rubber bands) (spring-loaded)

Let's save adding the grey rod for last.

Because the blue and red rods together still have less total mass than the grey rod hitting them, their velocity will match whatever speed you can get the grey rod to reach, assuming the laws of physics and transferrence of energy. The spring acts as a shock absorber, preventing any extreme stresses on the K'nex parts and returning to optimal position again.

Yours may need to be tuned differently from mine to keep the blue rod in the perfect place, but you'll understand this better once it's complete.

If you don't want to use a spring, rubber bands (fourth picture) are an alternative, although I've so far not had much luck with them. Loss of strengh.

Step 2: -middle Section- the Handle.

A nice little break from the previous step's complexity. Follow the pictures. I personally find it to be rather comfortable.

Step 3: Attach -back End- to -middle Section- (Like So)

Lo and behold, the two things you made fit together!

Once again, follow the pictures. It's looking vaguely like something, now.

Step 4: -front End- the Ammunition Hopper, Loading Arms, and Barrel.

MEGA NOTE: I am left-handed and prefer it this way. You might want to mirror-image the pictures of this Step 4, if you'd rather the loading arms be on the opposite side.

Either way, I've split it into the hopper lid (top and first image) and the barrel with the loading arms. Try not to get your front/back mixed up, take your time.

This section is complicated, so I'm trying my best to explain it through pictures.

This is where you use them -- the three decapitated dark grey connectors should line the bottom interior.

EDIT: I have added (as the final picture) A picture showing how I create the decapitated grey connectors necessary for the hopper. I place a row of greys on a rod and then clamp it down with a vice. Then, carefully, I cut downward. Any saw meant for wood should be able to cut through K'nex.

Step 5: Attach -middle Section- to -front End- (Like So)

This is rather awkward because you must keep the spring-loaded blue rod between the two sections, but you can do it.

Step 6: Structural Reinforcing and Arming.

Triangles are the strongest geometric shape. Without this add-on, the weapon is very flimsy. The top things are perhaps more decorational than necessary. Now that the complexity of joining all the segments is over, you can prime the launcher with the rubber band-powered grey rod.

If you've made it this far, horay! Construction complete.

Now to figure out how exactly to use it.

Step 7: Firing Procedure.

The red rods load into the top of the hopper from the back, between the two green connectors. Don't try shoving too many in at once.

Before every shot, you must pull the loading arms back to allow the stack of red rods to drop down, putting one in a ready-to-fire position.

Then, by pushing forward on the loading arms, it should tuck the black pieces between the ready-to-fire round and the others, lifting the rest up and away. At this point, there should be so little resistance that the red rod could slide out if the gun were tilted down.

Pull back, let go. So long as the blue rod is kept from blocking the falling of the red rods, the gun has an easy time supporting powerful rubber bands. The only limitation is that red rods lose their aerodynamics rather quickly once they begin to fly through the air sideways. At close range, however, they have serious inertia and I warn everyone that it will dent walls.

If you want even more serious power and better range, fill the hopper with TAN rods if you have enough and let the grey rod you pull back be replaced by a heavier black. Just don't hurt yourself or the cat.

Comments

author
KneXFAN200 made it! (author)2016-09-18

I really like it but could you use something else than a spring? Plz answer soon.

author
bboy321321 made it! (author)2012-12-14

looks cool i'm going to build it.

author
Capt. Fat made it! (author)2010-05-20

lol, this looks almost like the BFG from Doom! all u need now are some knex demons.....

author
ultimut cat made it! (author)ultimut cat2012-06-20

ponyz!!!!!!!!!!!!!!111

author
SpeedStrikerXLR made it! (author)SpeedStrikerXLR2010-09-28

lol you are right! BFG9000

author
awaite made it! (author)2009-01-03

How far do these knex guns shoot they dont look like they can do much

author
benfoxg made it! (author)benfoxg2009-02-25

they can fire over 1000 feet... with rocket engines glued to the rod. or about 500 without pyromaniacness. (hey I made a new word)

author
Perfect Duck made it! (author)Perfect Duck2009-02-25

I wouldn't say they can go 500 feet. Just based on the density of a plastic rod versus the density of the fluid air that it has to push, that's just not going to happen, especially when rods begin to fly sideways after a short while (unless they are fin-stabilized, which guns like the Red Impact are unable to fire, also it brings up the issue of modifying pieces)

Also, the word you're looking for does exist, and is properly spelled Pyromania.

author
An Villain made it! (author)An Villain2009-05-18

if fired in zero gravity and a vaccum that extends infinitely they will go on forever or at least until they hit something

author

...or is pulled into another planets field of gravity. (orbit)

author
An Villain made it! (author)An Villain2011-11-26

Yes.

author
xadevox made it! (author)xadevox2009-08-03

lol like SPACE!?

author
An Villain made it! (author)An Villain2009-08-03

yes, but with no planets, stars, asteroids, etc.

author
thebookworm127 made it! (author)thebookworm1272009-06-04

dude you should get a life, stop drinking soda and you know maybe play a sport or two

author

we do what we want to do. i hate sport personally, and im sure DJ and perfect duck and most other epic knexers have hobbies other than sport.
soda is just carbonated water with E-numbers and flavourings, so i cant argue. but it still tastes good!

author
NYPA made it! (author)NYPA2009-12-22

...


F9TV045FZWXOL5W.MEDIUM.jpg
author
thebookworm127 made it! (author)thebookworm1272009-10-08

take the advice

author
Perfect Duck made it! (author)Perfect Duck2009-06-04

I think you have this confused for a forum about personal matters. You're looking at a K'nex gun I designed 2 years ago, keep your comments relevant.

author
DJ Radio made it! (author)DJ Radio2010-05-03

Slingshots like the SRv2 fire fin rods without modded parts.

author
benfoxg made it! (author)benfoxg2009-02-26

u sma. but I can still glue rocket engines to them.

author
J Moneyman made it! (author)J Moneyman2009-03-13

he's right PD

author
J Moneyman made it! (author)J Moneyman2009-03-13

that PD is supposed to be perfect duck, not a smiling one eyed pirate!

author
adio made it! (author)adio2009-02-14

i built this before and i got like over 100 feet with 3 rubber bands

author
Wafflicious made it! (author)Wafflicious2009-01-18

some can fire more than 200 feet but most about 20-100ft. (some can very much harm things)

author
James368 made it! (author)2011-06-08

do you have to use a spring

author
biky69 made it! (author)2011-04-21

do you have to have the spring???

author
knexjay made it! (author)2009-09-16

muist u have spring?

author
Perfect Duck made it! (author)Perfect Duck2009-09-17

The answer is in the instructable. -_-

author
ooglie_booglie made it! (author)2009-07-12

i dont have any black rods (pic + 3 on the sides) can i use normal grey

author
DJ Radio made it! (author)DJ Radio2009-07-18

yes, but it wont be able to support as many bands.

author
ooglie_booglie made it! (author)2009-07-12

complexity you like that word dont you..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ME TOO ITS MY NEW FAVORITE WORD HI 5

author
ooglie_booglie made it! (author)2009-07-12

any replacements for black hinge pieces i only have 1

author
ooglie_booglie made it! (author)2009-07-12

dispicable mistake lol

author
calvyn made it! (author)2007-07-17

you could just a spring from a "clicker" style pen @_@

author
ooglie_booglie made it! (author)ooglie_booglie2009-07-12

too small

author
ropple07 made it! (author)2007-04-12

do you need the spring

author
ooglie_booglie made it! (author)ooglie_booglie2009-07-12

on the last pic it shows the rubberband varriation of the gun

author
calvyn made it! (author)calvyn2007-07-17

i used a pen spring. i unfurled the tighly coiled bit at either end by getting the blade of some scissors into the less dense bit and going round till i got the end with just the sharp bit on the end. then if you pull and twist against the diretion of the turn it gets bigger and looser. do this for both sides and then youcan force it onto a pencil (which is almost the same size of a K-nex rod) and force it on (carfeful with pointy end i stabbed my self and was bleeding a lot0 then you can take it off and put on the blue rod. only took 15 minutes and some blood

author
RMConstruction made it! (author)RMConstruction2008-11-09

Lol, i did too. But i got 2 mins and no blood... im careful you see lol

author
redneckobsessed made it! (author)redneckobsessed2008-06-27

ty

author
T-man made it! (author)T-man2007-07-05

no look at pic 4 on the first step

author
An Villain made it! (author)2009-05-31

maturity 1: the state or quality of being full grown or developed maturity 2: the state or quality of being mature common sense: good practical understanding as you can see I am an intelligent human being.

author
Perfect Duck made it! (author)Perfect Duck2009-05-31

Take this to another forum and leave irrelevant comments off my instructable.

author
An Villain made it! (author)An Villain2009-05-31

okay Perfect Duck, i never like it when people do this, but i can't stand it when people just leave mean or dumb comments on other peoples instructables.

author
An Villain made it! (author)2009-05-31

what is the definition of this word? onomatopoteia. if you do not know the definition is: a word that sounds like what it is eg. splash, thud, etc.

author
An Villain made it! (author)2009-05-31

okay geodez.

author
An Villain made it! (author)2009-05-31

quibbling eh? did you know any of those words or did you have to look them up?

author
An Villain made it! (author)2009-05-30

you have no idea who i am...

author
An Villain made it! (author)2009-05-30

elmer fudd? i was thinking baby talk.

author
An Villain made it! (author)2009-05-18

what did you say? i couldn't understand you under all of that sarcasm.

About This Instructable

22,512views

84favorites

License:

More by Perfect Duck:K'nex Dual Pistol setThe K'nexecutioner 2.11 - "Cyclone"The K'nexecutioner 1.02
Add instructable to: