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About DrJB

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  1. DrJB

    42099 - 4x4 X-treme Off-Roader

    This might have been reported before (apologies if it did) ... but I see an error in the Smartphone App. In there, the icon for the vehicle shows the tires mounted backwards i.e., the chevron pattern on the tires is pointing up, not down (looking from the front of the vehicle). Second from Top/Right corner, in image below
  2. DrJB

    Help Identifying Part

    Thank you ... it came in blue in only one set, and I do have that set (assembled/on_shelf) ... but I never looked at such part from that angle :(
  3. I saw the Pagami Huayra by Jeroen Ottens and can't identify the blue part below. Anyone can shed some light? Thanks https://thelegocarblog.com/2019/04/18/buy-this-pagani-huayra/
  4. Just a 'minor' addition: For those who are not familiar with what a road train is. It is essentially a truck with multiple trailers one behind the other. The suspension/articulation geometries must be 'right' to ensure the convoy is stable. Can you rescale your image?!
  5. DrJB

    New personal Lego dark age looming?

    I'm in the same boat. I used to follow very closely the new Technic sets and get them as soon as they come out. Now, it seems all new sets are 'variations on a theme' ... but in fact I think it is me, It's like any other hobby, I've had few of them over the years (astronomy, reef tanks, FTA, electronics, 3D printing, ...), and interest 'disappears' after a couple of years. That and lately that the cost of Technic sets has gone way up. The one hobby I have not given up yet on is gardening ... what's the point in having a house/yard if you can't grow some greens? I'm now contemplating bee-keeping, but not sure the neighbors would approve. Back to Lego, I've reached the point where, just like SR71, I want to sort/clean/pack my many sets and find a good buyer.
  6. DrJB

    [MOC] Challenger MT865C & Kinze 1050

    Great rendition of an icon. I had worked on the actual full machine few years back, together with the green (Deere) and AGCO versions. Been wanting to do/see a MOC and yours captures it superbly.
  7. DrJB

    LEGO Technic Turbo Polyp / Kraken

    I guess it was novel to me ... I'm aware of the one using the large hailfire wheels with soccer balls (Sariel uses it in many of his videos) or wheels (below), but it's the first time I see the BWE's curved racks used that way.
  8. DrJB

    LEGO Technic Turbo Polyp / Kraken

    Impressive!!! This IS worthy to be front-paged. I like your 'novel' large turntable idea (with the small roller-bearings) and I'm sure once we see the assembly 'moving' we'll get even more appreciation to the inner workings and intricate mechanisms, and even more questions about how you accomplished specific functions. Excellent Job! Question 1: In real life, the up/down motion of the arms is accomplished by hydraulic cylinders. Did you use LA, pneumatics, or something else? IMHO, some pneumatics with 'sequencing' would be a neat add-on, though maybe a bit difficult to house. Question 2: From the kinematics (your 1st video), it seems each rider-seat has 4 degrees of freedom: rotation of the arm about vertical axis, lifting of the arm up/down, rotation of the 4x2 seats, and then rotation of the seats about their center. I'm sure somehow all seat are connected in 'parallel' and there are a total of 4 motors (or DOFs) for the whole assembly. Now, how many motors are you using and how many independent controls over the 4 DOFs ?
  9. DrJB

    Aesthetics and Technics

    While I agree with many of the OP's points, this is bound to be a bit of a 'sensitive' discussion as we might get some forum members a bit offended. Yes, I've gotten to a point where I simply 'ignore' many posts (I get an email with every new thread) as after a while, one gets numb to all the 'basic' questions and sub-par MOCs. My approach here is: well, I started there myself sometime back as well and there should be a way to encourage new-comers. If you list all the threads that have 'Ferrari' or 'Lamborghini' in their title, some are worthy of a frontpage, others are, well, ... no need to offend anyone :). Maybe the way to address this is to split the forum further into sub-levels but then it becomes tricky to navigate, and we might miss important/interesting threads/discussions. My 0.02 worth
  10. While it appears (on the outside) that there is no room for gearing ... it does in fact have have a planetary single-stage gear reduction.
  11. DrJB

    LEGO Technic Turbo Polyp / Kraken

    I remember this discussion ... it was about the time where most of us were getting 'tired' of vehicles with wheels, and wanted to see something different. Yes, would definitely appreciate seeing the progress you've made and how you solved the mechanical 'challenges'. For rotating the seats, maybe flex axles like those used in the ZNAP line could be helpful, as they bend 'easily' and can go through the arms.
  12. DrJB

    A really practical lego application

    A while back I was into salt-water fish-tanks and yes, finding someone who can feed your fish 'reliably' was always a pain. I like what you've done, but am no longer into that hobby as it does require a lot of time. Feeding is only part of the story, then you need to do regular water changes and add chemicals to 'regulate' the tank's chemistry. In that regards, any bit of 'automation' (as you've done) is a very welcome initiative.
  13. DrJB

    [POC] Independent Virtual Pivot Suspension

    Nicely done. The main issue with these (I think) is the excessive slack from all the links. Conceptually though, this is nice and as you've shown requires a wheel with enough clearance to house all the parts. Have you calculated what the 'scrub radius' is? It is the distance between the center of the tire's footprint and where the pivot axis intersects the ground. In real life, such scrub radius affects many performances of the vehicle, primarily handling and tire wear.
  14. Up until few years back, every technic set had a large collection of 'colored' parts (connectors, flex axles, liftarms, ...). Recently however, most of the vehicles' interior/chassis is typically made up of only monochromatic (black/grey/white) parts and then, a minimum of parts (primarily for styling) are truly 'colored'. There was a time where I 'lamented' as to the lack of colors in Technic as all the SuperCars were issued either in red or black. Back then, the overwhelming answer was the lack of available 'other' colors. Now it seems we're migrating back to 'rare' colors and small number of colored parts for styling ... and yet purely monochromatic parts for the Chassis. This is somewhat the case for many StarWars set as the grey is meant to 'mimic' steel and metallic structures. What are your thoughts on this and how has this affected your 'MOCing' options ? Oh Yes, miss seeing an official Technic Car in RED ... the last we've seen is 8070, and then 'smaller' attempts since then, as in the customizable truck and the fire truck. The latter though has more grey than red.
  15. What would happen to all the FLL programs (worldwide) that use MindStorms as an introductory 'Robotics' course? As many might recall, Mindstorms started out from a robotics course at MIT 6.270 (late 80's) and then the first brick (RCX) was developed jointly by MIT and TLG. Many schools (Highschools and Universities) have then adopted the format and started offering introductory courses. If MindStorms is to go away ... many schools would need to 'scramble' for new content.