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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.










Comments

 I like it 
  August 18, 2011
cool plz send me a email with the instrutions bjorgvingaur@gmail.com
 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: http://www.mocpages.com/moc.php/55609. 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 http://www.mocpages.com/moc.php/69921 Happy racing!
 
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LEGO models my own creation MOCpages toys shop NXT DraXTer #1Technic


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