MOCpages : Share your LEGO® creations
LEGO models my own creation MOCpages toys shop NXT DraXTer #1Technic
Welcome to the world's greatest LEGO fan community!
Explore cool creations, share your own, and have lots of fun together.  ~  It's all free!
NXT DraXTer #1
NXT DraXTer #1, a dragster for racing a 5 meter track in the shortest time possible.
About this creation
This is my first attempt at a dragster from a single NXT set.
For a private competition, the dragster is designed to drive 5 meters in the shortest time possible. Constraints include a standing start, carrying the NXT brick/battery box, and finishing as started in one piece.

This dragster features huge spoiler wings, a 1:9 gear train and a stiff front wheel suspension as required by the little clearance under the body. The gear train and drive wheel construction was optimised for having little friction.

The brick runs a NXT-G program that does a proper countdown aloud, then rotates the motor full power to travel 5 meters, and finally clocks its own time with millisecond resolution!

The top speed of this dragster is theoretically 170rpm*9*56*pi/60 which is about 4,5 m/s or over 16 km/hr. However, the track of 5 meters is way too short to develop such a speed, particularly in view of its mass of 622 grams, mostly due to the batteries.

The fastest real run was in 3661 milliseconds. This equals an average speed of 136 cm/s. Assuming a constant acceleration the finishing speed must have been about 10 km/hr.
If i take the brick off and run along with it, it races 5 meters in 2590 milliseconds, finishing with about 14 km/hr. If i have a dry run holding it in my hand, it "finishes" in 1440 milliseconds. My interpretation is that the mass and gear ratio are reasonably balanced for the 5 meter track.

I am thinking about how to improve: stronger batteries, lighter batteries (LiIon), less gears/larger wheels, add motors andsoon.

Let me know if you come up with a faster time/design.

Build instructions are available from a photobucket subalbum at: NXTDraXTer NumberOne, start with IMG_8045 at about 1/3 of the album and count backwards, sorry for the misordering.


 I like it 
  August 18, 2011
cool plz send me a email with the instrutions
 I made it 
  November 11, 2008
Todd: Yes, i aimed at using a single NXT retail set only. However, i guess relaxing to non-NXT opens up for eg Power Functions, like the ChainRider, reaching 2.7 seconds, see: So yes, go ahead and see how far you can push it! Mind you that Techno Moves came up with a machine that does 5 meters from a standing start in 1673 milliseconds, clocked by a NXT with a laser and two mirrors... See his page Happy racing!
By NXT Liftboy
Add to my favorite builders

people like this. See who.

6,197 visitors
Added August 25, 2007

LEGO models my own creation MOCpages toys shop NXT DraXTer #1Technic

You Your home page | LEGO creations | Favorite builders
Activity Activity | Comments | Creations
Explore Explore | Recent | Groups
MOCpages is an unofficial, fan-created website. LEGO® and the brick configuration are property of The LEGO Group, which does not sponsor, own, or endorse this site.
©2002-2019 Sean Kenney Design Inc | Privacy policy | Terms of use