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  1. Lucullus

    42100 Liebherr R9800 Excavator

    Looking forward to the first BWE Moc with this new bucket.
  2. One thing that has to be kept in mind is, that while the virtual pivot is always located at the intersection of the steering arms it doesn't mean that it will always be at the same place during the steering motion. The wheels won't turn on a circular path like they would do with a nonvirtual pivot. In the above picture this is especially evident if the yellow liftarm is turned so far, that it lies in one line with one of the black ones. In this moment the pivot point is on the 2l axle at the opposite end of the yellow liftarm.
  3. Lucullus

    [Help] Expanding circle (or cylinder)

    Maybe you can use a mechanism with a plate that slides along the axis of the wheel, similar to the opening/closing of an umbrella or the collective control of a helicopter.
  4. Hello everyone. My entry for the Technic Contest 15 is based on the simple idea, that all Lego motors have a too bad power/weight ratio to be used to power a flying object, as long as they stay a part of this object. Therefore I used a Pullback engine to power a simple propeller to make it actual fly. As this alone would be a little too simple I decided to build an aiming/launching mechanism arround the basic concept. The functions are: -tensioning the motor by a worm drive -blocking/releasing the motor -rotating and tilting the launcher
  5. Will a pull-back-motor-powered propeller launcher be allowed? Because the actual flying part will be small/simple and not be self-propelled.
  6. Do the springs have to be compressed while connecting them to the chassis?
  7. Lucullus

    Generic Contest Discussion

    Some time ago a "mechanical animal competition" was discussed. Is there a chance that it will be revived? This would require a lot more mechanical creativity from the builders, because you can't just copy the real thing, as is possible with a car / plane.
  8. Lucullus

    Generic Contest Discussion

    Regarding #2, would the requirement "motorized" include a pneumatic animal with external motorized pump, or does it have to be directly motorized?
  9. "Who will like this set? - builders looking for some breakthrough in Lego transmission design" and "Who won't like this set? - anyone looking for complex and realistic functions" sounds a bit like a contradiction. The Chiron's transmission looks like one of the most complex (and in some aspects, most realistic) Lego features in recent times. In my opinion at least more genious and less "obvious" than the lowered rear diff solution.
  10. That should not be difficult, use a 90 ° stepper and add e.g. a 24/12 gear ratio.
  11. Simple 5+R setup with only two axles, but still not very compact.
  12. Lucullus

    42083 - Bugatti Chiron

    Any idea on how those selector rings will be controlled? If each one is connected with two clutches there won't be a neutral position in each "sub-gearbox", so it can't be a simple layout with one clutch-position corresponding to one of the (probably) 8 gears. That means, that the orange selector rings won't move at the same time but are controlled by a mechanism that transfers the 8 positions of the gear lever/paddles to two independent 4 step rotations.
  13. Lucullus

    42083 - Bugatti Chiron

    The real chiron has a haldex type awd (without center diff), so maybe there will be no diff in the model too but instead clutch gears to connect the front axle to the gearbox.
  14. Lucullus

    42080 Forest Harvester

    The yellow spiked rollers should be positioned at right angles to the trunk so that it can be pushed up and down. That's how it's done in real harvesters.