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January 5th, 2009 Leave a comment Go to comments

Very simple lightweight car, built exclusively for speed tests.


Completion date: 18/05/2008
Power: electric (Power Functions)
Dimensions:  length 41 studs / width 26 studs / height 16 studs
Weight: 0.94 kg
Suspension: front – independent / rear – dragged axle
Motors: 3 x PF Medium

A very simple construction, built exclusively for speeding. Very softly suspended, it is driven by two PF Medium motors, that don’t use any real drivetrain, but are connected directly to the wheels, and together form the rear axle. To make both motors drive in the same direction, I have connected them two different IR receiver outputs, which resulted in the addition of a second receiver used for steering, as the PF switches were not yet available at the time.

It was built with little concern for aesthetics or robustness. The look was completely different from what you can expect a dragster to look like, and the rear wheels were falling off from the motors from time to time. It was, however, as fast as it could to be controllable inside my apartment, and provided a lot of fun while drifting. I do not consider it to be a limit of speeds possible with the PF system.


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  1. Sariel
    April 20th, 2010 at 15:52 | #1

    @Dave Benson
    I don’t remember.

  2. Dave Benson
    April 20th, 2010 at 15:40 | #2

    Hi Sariel!

    What is the theoretical/practical topspeed of your Lego Dragster?

  3. Sariel
    December 10th, 2009 at 23:15 | #3

    If the motor’s power is sufficient then yes, gears would be a waste of power.

  4. M-Man
    December 10th, 2009 at 19:17 | #4

    So your just better connecting the motor directly to the wheels?
    It is just I saw your gear tutorial. 🙂

  5. M-Man
    December 10th, 2009 at 19:15 | #5

    I see

  6. Sariel
    December 6th, 2009 at 17:54 | #6

    And you would waste some of the motors’ power to rotate the gears, as the use of gears always degrades efficiency.

  7. M-Man
    December 6th, 2009 at 17:02 | #7

    I would use 2 PF Medium motors connected to a drive shaft with a largish kind of gear then a axle with the wheels and a small gear. (Gearing up.)

  8. Sariel
    August 27th, 2009 at 10:22 | #8

    I used two PF Medium motors connected directly to the wheels. You can see this from photos, can’t you?

  9. Adi
    August 27th, 2009 at 09:16 | #9

    How did you make it so fast.

  10. Frank Sanchez
    June 29th, 2009 at 23:35 | #10

    That things awesome! Nice design and very compact.

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