Roadrunner Buggy
Small, simple lightweight buggy. Features full suspension and rear axle drive.
Datasheet:
Completion date: 20/01/2008
Power: electric (Power Functions)
Dimensions: length 37 studs / width 22 studs / height 26 studs
Weight: 0.86 kg
Suspension: front – independent / rear – dragged axle
Motors: 1 x PF Medium, 1 x PF XL
This project was intended to test what speed can be achieved with a PF XL motor, and additionally I was hoping it could drift a bit. There is a differential with 4 bevel gears in the rear axle (a technique developed by LUGPol user Aro_kal), and the gear ratio accelerates motor’s output speed almost twice. The buggy proved to be fast and manoeuvrable, but a bit too slow and to heavy for drifting (probably in part because of the battery box over the rear axle), unless it was given rear wheels without tires and placed on some tiles instead of a regular floor.
@BuggyBuilder
Try Bricklink.
Also, maybe with instructions please?
Can you make another buggy with an xl motor? (I know it’s been long since you did so).
Otherwise, where can I get an rc motor?
@Dan
Maybe I’ll try it one day, this MOC is long gone.
might is suggest a forty tooth gear as the driver gear, a 24 tooth gear as a middle gear, and finally an eight tooth gear as the follower gear. This results in ratio of about 1-5.?. This is ideal for speed, and i have already tested it.
@harrison
Well, they come from my brain, where else?
How do you come up with so many ideas? I’ve started a 8 wheel off-road buggy.(remote controlled) please let me know where your ideas come from,thanx
@Sariel
thanks sooo much!
@Jake greene
Here: http://www.bricklink.com/catalogItem.asp?P=32467
Where did you get the rpm counter on the back? I need on really badly! Well I don’t need it but I’d love to get my hands on one! Some one email me where to get one I’m jakerox360@gmail.com plz help! Thx
fa veramente schifo, è una vergogna per il LEGO. E’ bruttissimo
And with bigger steering lock.. 😉
Maybe the car could drift if there was minimal load on the rear axle (as you said), and using 20×30 wheels, or 24x… dunno, but those with the hard, rigid tyres. If I had pf stuff, i’d give it a try for sure! 🙂
should have tried before asking -.-
thx
@OlSom
Friction holds it there, nothing more. The trick is to insert the last 2 gears into the differential at the same moment, meshed together. Try, and you’ll surely work it out.
I dont really understand how the differential is working. What holds the 4th bevel gear in position? Could you please explain, as it seems to improve the differential’s durability, and i have broken some (2) bevel gears already with an offroad vehicle, so it would be great to have a stronger one. Thanx