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About AndyCW

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    Lego, automotive performance, games, RC planes, unmanned aviation


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  1. [MOC] Truggy

    Awesome and simple. To get better performance, you need to scale down or manage to direct drive those wheels with the motors. (ie no gears)
  2. [WIP] 4x4 Crawler (More or less done!)

    Not so much a comment on the body work, but more so on the 'placement of the body on the chassis'. It appear that the body is lifted too far above the chassis. The top of the tire is far below the bottom of the quarter panel This unnecessarily raises the center of gravity and presents this image.
  3. 4x4 Rock Crawler

    I use a Pololu TReX DMC and a 2.4 Ghz radio system; mounted inside of an old 4.5v C cell lego battery box I had lying around. Using Philo's motor specs and assuming a linear relation between current consumption and torque output, even the Sbrick and BuWiz will limit the power output of the 5292 buggy motor. The above motor controller has enough power to supply 4x 5292 buggy motors at full power. Where either of the other two options struggle to fully feed one of them. My signature has some links that demonstrate the available performance.
  4. 4x4 Rock Crawler

    looks like a rock bouncer I've made multiple 2x buggy motor rock crawlers/bouncers. What overall gear ratio are you running? What is the total weight? I've discovered that I can run 2x buggy motors at 5:1 with 108mm tires on a 3s lipo and it provides entertaining performance
  5. You're going to want to: reinforce the pinion bearing to prevent the pinion from 'walking' up the ring gear the 1L bush allows the axle with the pinion gear to deflect and will cause the pinion gear and ring gear to skip provide some cross bracing to prevent the ring gear from 'walking' away from the pinion the 7L liftarms on either side of the differential can separate and let the ring gear come out of mesh with pinion gear A smaller tire/wheel and the associated smaller loads will reduce the chances of these above issues.
  6. Torsion bar It's easy to implement with lego and prevalent on trailers.
  7. All things equal, when you have similar output speeds, you will get similar torque. In this case you are using the same motor. Friction becomes more of an issue the faster things turn To minimize losses through a gear exchange, use the largest gears possible (most teeth) and brace the gear enclosure to the maximum extent possible 12t to 36t (3:1) is more efficient than 8t to 24t (3:1) This is one of the reasons that the knob gear is so poor
  8. I know that the angled steering links help with ackerman, but they also induce slop. I've found several things to reduce slop. Try to make the steering links parallel to the axle. Make the steering arm on the portal hub longer, but this reduces steering angle. Mount servo directly on axle If you can put in some kingpin inclination and caster angle, then the slop won't be as noticeable because the wheels will 'want' to go straight ahead.
  9. Purism

    I use 3d printed parts, non-lego tires, 3s lipo batteries, a Pololu TRex DMC, a Traxas 2.4 GHz radio, and sometimes even my SBrick. I do not alter parts (generally) and I do not use Kragle. I also strive to keep the non-lego parts to a minimum in my MOCs. If I can 'make it happen' with lego, then I'll have no need to resort to non-lego. I'll try numerous iterations of a lego design and only if they have all failed do I look at non-lego solutions. I'm not a purist by any measure, but do understand it.
  10. I love this project. For some reason the body work reminds me of a TVR.
  11. [MOC] Trial Truck

    Nice. I appreciate you photography and videography skills. I too think that you could easily increase the speed due to the torque of the xl motor.
  12. Zero's workshop

    Welcome 'Home'
  13. Those numbers mean 265/35/19 = 265 mm wide / 35% of that as sidewall (265 x 0.35 = 92.75) / fitted on a 19 inch wheel 19x9.5 = 19 inch wheel diameter and 9.5 inch wheel width v/r Andy
  14. Here are those hubs with the ball adaptors from 8880. This iteration is far better than V1 and should hold up to a great deal of abuse. Basically the same architecture was used in this MOC. With the ball part installed, I can not separate the wheel adaptor from the hub, but removal of the ball may weaken the structure. After all, the ridge that holds the wheel adaptor to the hub is preventing from deflecting by the presence of the ball. v/r Andy