Introduction: BLOCKHEAD: Precision Crossbow

Picture of BLOCKHEAD: Precision Crossbow
Here it is, the block-bowed-crossbow called BLOCKHEAD.
(V6 in the series)

It features a massive punch, while still able to use a true-trigger perfectly.
One can still detach the trigger to be able to fire 4 arrows in a row like the Reaper.

Although I was in a hurry (work after school \o/ ), the pictures should be fine.
Just in case I have a .rar archive included with all the full-sized pictures (2576x1932) in it, if you need to take a better look.


Extremely powerful
Long range
Very accurate
Perfectly working true-trigger
Very sturdy where it needs to be
Easy to mod


Not the fastest loading with trigger (goes faster once you get the hang of it)
The front handle needs improving
Its very heavy (dunno if this is bad =p)

Two video's, showing trigger and damage

Here is the .rar file
Picture .rar archive

Step 1: Building the Handle

Picture of Building the Handle

Image 1: Build these two sides of the handle.

Image 2: Build the center of the handle.

Image 3: Different perspective; center of handle.

Image 4: Connect the side with the center.

Image 5: Different perspective; center + side.

Image 6: Add the other side to it as well.

Yup that's the handle, wasn't too hard eh?

Step 2: Building the Trigger

Picture of Building the Trigger

Image 1: Build this part

Image 2: Build the other side

Image 3: Other viewpoint of Image 2

Image 4: Other viewpoint of Image 2

Image 5: Attach both sides to each other

Image 6: Build these parts

Image 7: Add them to the construction

Image 8: Build these two parts

Image 9: Build this thingy

Image 10: Add the thingy and connect the two sides

Image 11: Build this

Image 12: Add it to the part of image 10

Image 13: Build these

Image 14: Add the new parts

Image 15: Add the two sides from image 13 together

Image 16: Add spacers and 3 gray connectors

Image 17: Add it to the rest of the trigger

Image 18: Build this part

Image 19: Same part different view image 18

Image 20: Add it as shown

Image 21: Connect shown pieces together

Image 22: Build decal wings

Image 23: Add like so

Image 24: Same as image 23

Phew that's a long step, but now you're done with the trigger =D

Step 3: Building the Bow (block)

Picture of Building the Bow (block)

Uh not really a bow? xd

Hard bit (Not enough time to take apart >.<)
Image 1: Try to build this by first building the 2 squares of blue connectors, then adding rods

Image 2: Same

Image 3: Same

Hardest part done.

Image 4: Build this

Image 5: Attach them

Image 6: Build this

Image 7: Add like shown

Image 8: Build these 4 layers

Image 9: Build 2 of these

Do the following on both sides!!
Image 10: Add a layer

Image 11: Add the top layer
Should be done with both sides now

Image 12: Should look like this

Image 13: Attach as shown, to get a block, not bow

Image 14: Build these 2 parts

Image 15: Add them like shown

Step 4: Adding Rubberbands

Picture of Adding Rubberbands

Just add the rubber bands

Image 1: Make 4 of these strings, these are 4 rubber bands long, the length may vary with the length of the handle

Image 2: Put them like so

Image 3: Then just connect them with the block (bow)

Image 4: 1st rubber band on the trigger

Image 5: Same as image 4

Image 6: 2nd rubber band, read note

Step 5: Assembling the Crossblock (lol?)

Picture of Assembling the Crossblock (lol?)

Image 1: This is pretty hard, time was nearly running out, CHANGE your handle to match the one in this picture!

Image 2: The bow is very easy; it just snaps on

Image 3: And before I forget, make this and put it somewhere on the handle

Image 4: Same

Image 5: Same

Image 6: Attach anywhere you want like so

Step 6: Ammo

Picture of Ammo

Loading and shooting is covered in the video's on the first page.

This can shoot the same ammo as the Reaper, hell I even used the same picture =x

Kinda sucks that I don't have the crossbow here while making the Instructable...
If you look at the handle close to the trigger, you'll notice you can pack it with arrows =p

Step 7: Finished!

Picture of Finished!

Yay its done! Now you can go out shooting stuff =D
It can be made more powerful making the handle longer, but if made too long, it doesn't fire long arrows like piercing ones..
And if you have an extremely long handle, ductape might help with red connectors that snap off under the strain.

.. Uh yeah don't ever shoot people with this thing, as it can be very dangerous/lethal =d
And I hope the instructions are clear enough, as I couldn't make additional pictures >.<

Image 1: Yup quite some improvement over this =D


Mace! (author)2012-08-21

What better to do with home grown vegetables?

~Z~ (author)2010-02-06

 About how many yellow cons does it use?

mettaurlover (author)~Z~2010-02-06

In all honesty, about as much as my gun does... this thing dispenses with the need for solid rows by suspending the ammo with the RB's instead of using a track... also less solid-I built my gun to be usable as a hammer with no loss to functionality.

Wicky (author)mettaurlover2010-02-07

Kinda like this one, as in hammer? =d

mettaurlover (author)Wicky2010-02-07

Not so much-mine's shorter and doesn't have a bow, and has advantages in those regards-just as powerful, while being more predictable and lighter.

Wicky (author)2009-06-30

Well I am sure it would require a lot of ductape, but it wouldn't be that hard at all; after all the first cannon was based off the Reaper. The most damage I have ever seen with any k'nex weapon in one shot would be this(impact from the Decimator on plastic radio):

smattman22 (author)Wicky2009-11-24

 can you link the wep in the last pic?

Wicky (author)smattman222009-11-24

I never posted that weapon, I only made a forum topic about it:

We are moving right now, so I don't have any k'nex at hand =/

smattman22 (author)Wicky2009-11-25

 aww :*(  im sorry about the no knex thing :(

imthatguy1125 (author)2009-10-20

I did but when i painted it i patched them

imthatguy1125 (author)2009-10-19

 I second that

~Z~ (author)2009-10-04

I found a typo! You wrote "Precision Crossbow" Instead of "Precision Hammer"!

Wicky (author)2009-06-30

I think metal knex pieces would be great, although it would be impossible to use the connectors xd Carbon fiber would at least take the problem of vaporizing connectors out when hitting walls.

Killer~SafeCracker (author)Wicky2009-08-01

Why would it be impossible to use metal connectors??

Wicky (author)Killer~SafeCracker2009-08-01

Because if you insert a rod in a connector it slightly bends to fit the rod in, using metal this would be quite hard =d

what about a meatal rod flatend at one end and the other for the tip drill a hole in it

Killer~SafeCracker (author)Wicky2009-08-01

True, I forgot about that.

Master_Zane (author)2009-07-02

It has the same principal though.

Wicky (author)2009-07-01

I am sure I did, it was used on the Reaper; IaC's cannon was built after that.

Wicky (author)2009-07-01

I wonder if carbon fiber is too light though, as the current problem is that the arrow is too light. But if I would ever see those on eBay I would surely buy them =d

Wicky (author)2009-06-29

Ow =/
Glad you're not hurt though, although it could've been worse; a friend of mine got hit on the knuckle by a red connector...propelled with 20 #64's .. ductaping arrows is essential when playing with massive power O.o'

Wicky (author)2009-06-28

Looks rather flimsy and has no trigger, needs a bit more effort, but with enough rubber bands it could be powerful.

P.S. I flagged the other 6 comments as spam, please don't spam =o

Dirtyboyy (author)2009-05-06

okay , i'm done with it and it shoots realy hard !! i give you 5 * ;)
i like the gun realy much and do you have shoot on somebody with it ? XD i shoot it soem time on my friend ... ( with the sr-v1 ) .. bud tanks for it , i have a mod ... the scoop of the vss that is something that you must make !! it can use on every weapon and you can us it to the dragonflY on the top ... so meby you gonna try it ..

Dirtyboyy (author)2009-05-06

okay :D i gonna make it bud i just have 1 question for i make it XD th trigger .. can that break off .. ? becaus eyou need a lot of tape for it ... why do you need that for ? and on the uhm black/bleu connector from the trigger why do you need there tape for ?

Wicky (author)Dirtyboyy2009-05-06

Well it is perfectly fine without tape, but the strain will weaken the connectors after a while until it won't fire anymore, that's why I use tape. If the hinge connectors bend, the blue rod that holds the arrow won't come down far enough.

Dirtyboyy (author)2009-05-06

sorry for the questions !! bud shoot the dragonfly farhter than the sr-v1 ? and if you shoot on the wall break the red connector then ?? :D

Wicky (author)Dirtyboyy2009-05-06

It is capable of shooting just as far or further, but that would involve using the flights. And I haven't made a crossbow that didn't break the red connector on impact against a wall. And it doesn't just break it, it makes it explode.

Dirtyboyy (author)2009-05-05

okay , i think that i understand it .. bud i look to the ammo of the dragonflY and the gray conector on the end .. that can dissolve shooting isn't it ? so do you need there tape to ?

Wicky (author)Dirtyboyy2009-05-05

Connectors have sides which bend outwards when pieces are joined or taken apart, this cannot happen in the trigger because it is closed in tightly.

Dirtyboyy (author)2009-05-05

what do you mean with notr the strongest ? if i put now more rubberbands than er are ... breake it than off ?

Wicky (author)Dirtyboyy2009-05-05

The frame connecting bow and trigger is not very wide, and yes it may snap off.

Dirtyboyy (author)2009-05-05

sorry for that unclear questions bud i would now wich one the best is to make just the best .. :D i would a realy realy powerfull knex gun ( bow XD ) bud i can all your bows / drogonfly gun bow XD make just blockhead not .. so wich one is realy realy powerfull good trigger system not that it suddenly shoot away , and is realy great powerfull and strong ...

and i must say that you are the best bow maker are ever !!! 5* for all you rguns XD and i thins that i speak a littlebit unclear bud i'm dutch you know ;)

Wicky (author)Dirtyboyy2009-05-05

If under extreme most of the time, you should put ductape on the red connector of the arrow. But this trigger type has no chance of firing prematurely. The Reaper is also insanely powerful, just not as advanced in trigger.(The video shows it shooting through wood.) I don't have any problem understanding you as I am Dutch too ;P

Dirtyboyy (author)2009-05-05

is it possible that if you reload it that it suddenly shoot away ? and how far does it shoot in meters ? or feet ?

Dirtyboyy (author)2009-05-05

wich one is the best off all your crossbows ( on this site ) because i like the dragonflY .....

Wicky (author)Dirtyboyy2009-05-05

I like the improved trigger on the dragonflY, but it is not the strongest, however slingshot weapons are way more powerful than weapons that use rods and tubes. This however should be the strongest.

Dirtyboyy (author)2009-05-05

allricht :D and i like you ! i post a comment and you anser me 50 minutes later XD how many white and yellow conectors do you need ? because than i gonna make it if i have inouch pieces :D

Wicky (author)Dirtyboyy2009-05-05

Problem is..I never counted the pieces, the only way one would know is to count them from the pictures, it should be easy though, as its completely symmetrical.

Dirtyboyy (author)2009-05-05

okay , i gonna make it ;) bud the trigger is not strong ( is that treu ? )

Wicky (author)Dirtyboyy2009-05-05

The trigger is one of the sturdiest ever date it has never failed on me. I use it on all sorts of crossbows nowadays.

Hiyadudez (author)2009-04-17

nice crossbow, but my only prb;em with it is the trigger, i think the trigger is too complicated again... nice crossbow :]

Wicky (author)Hiyadudez2009-04-17

Take a look at the DragonflY, maybe you will understand it then, the trigger should fit perfectly fine.

Dirtyboyy (author)2009-04-08

does it shoot fahrter than 160 feet ? and looks funny 4.5

Wicky (author)Dirtyboyy2009-04-08 could if more rubberbands are added and is made longer..

Wicky (author)Wicky2009-04-08

Ow..I thought this was on my new Ible xd This can easily fire more than 180 feet

razzlekunai (author)2009-03-23

I am in the progress of making this. I was thinking about all the fun I could have shooting my neighbors, but a question suddenly formed into my head: What type of rubberbands does this use?

Wicky (author)razzlekunai2009-03-23

I never selected these on purpose, but these are just standard cheap small thin rubberbands:

razzlekunai (author)Wicky2009-03-24

WOuld #64s work as well, or can the trigger withstand only so much pressure?

Wicky (author)razzlekunai2009-03-25

I have a bad experience with bigger rubberbands, because they tend to flip the arrow around, but if you ductaped the trigger, it should be able to hold it I guess..only one way to find out though...try it =/

Electroinnovation (author)2009-03-06

Sorry. The link was faulty. Click here for THE 10 BEST KNEX INSTRUCTABLE OF 2008. (and the beginning of 2009)

About This Instructable




Bio: I seem to like building crossbow shaped objects.
More by Wicky:Triple-shot CrossbowUltimate Crossbow V2BLOCKHEAD: Precision Crossbow
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