Instructables
Build a battle tank from a few LEGO pieces.
 
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Step 1: Grab Your Pieces

1x4459 Technic, Pin WITH Friction
1x3708 Technic, Axle 12
1x6582 Wheel 20x30 Balloon Medium
1x x89 Rubber Belt Large (Round Cross Section)

Step 2: Prep the Wheel

Insert the technic pin into one of the outside holes of the wheel. Push the rubber belt through the center hole and loop one end over the technic pin. This will allow the belt to wind up.

Step 3: Wind Up

Push the axle through the loose end of the rubber belt (opposite side of the technic pin). Hold the wheel and spin the axle around to wind up the rubber belt.

Step 4: And Let Go

Place the wheel on a smooth surface and let the axle go. The rubber band will unwind and the axle will push against the surface moving the wheel forward. If it wants to go in the wrong direction, flip the wheel over so the axle is on the otherside.
akanigel8 years ago
We used to make these with a cotton reel (I guess spool in America) What you seem to have missed out is the 3/4" bit of candle between the drive prop and the spool. It acts as a friction regulator, and yes before the days of computers this was a stock toy for boys to make and race. Ah innocent times
ya. in the USA u call it a spool.
toucan6 years ago
No offence but see cotton reel tank it's easier.
Nice instructable. I need that big white thing and that special rubberband. I like it!
so you basically need half the parts? ill just steal legos from my brother's room! He wont mind he has so many.
porkdemon8 years ago
my dad showed me how to make these with a cotton reel as well, when i was little my dad and i spent like an entire day making stuff likt this, ahh good times
N3gat1v38 years ago
that thing or whatever won,t even move lol
Acutally, it will... Just... Not by itself...

Also: this isnt a battle tank made out of lego.

These are (somewhat... Some arent real lego...):
http://www.brickshelf.com/gallery/SaberScorpion/Halo/scorpion_tank_5.jpg
http://www.blockland.us/smf/index.php?topic=8513.0
http://www.blockland.us/smf/index.php?topic=8473.0
austin8 years ago
a battle tank? this looks just like the sewing spool thing
leevonk austin8 years ago
battle spool