Marxpek

Eurobricks Citizen
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    392
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About Marxpek

  • Birthday 10/01/1984

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  • Website URL
    https://www.youtube.com/channel/UC6lf0Jsv6JPuukJ5OHLv3qg

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  • Gender
    Male
  • Interests
    Lego Technic, Lego RC, Lego MOC, Lego speed record

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  • Country
    The Netherlands
  • Special Tags 1
    http://www.eurobricks.com/forum/public/style_images/tags/technicgear2.png

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1526 profile views
  1. seems i already was on the right track with my previous actuator: The offset ring was the key for strengthening the whole thing, it also helps with mounting it to the arm of the ride. in the picture we see a old version of my actuator that failed, in the current version the ring is closed and just 2 wide in stead of 3, but it still has the offset for strength. In the end the solution was pretty easy, while the forces are huge, it works, this thing is not really well braced or balanced yet, considering that i call this a success, as you can see/ hear i pushed the arm a bit too far on this test and as it wobbled a bit, one of the figs started to sag down and hit the table, causing more instability, but everything stayed in one piece and no figures where lost. Next step would be to redesign the drum and after that redesign the arm.
  2. Not with a technic built solution. But in the demonstration video i could clearly feel the gyroscopic effect: the spinning motion makes it want to stay in the same spot, so the lifting force needed is increased a lot. Lifting or pushing it to 90 or 180 degrees is doable with the curvilinear actuator i made. But getting it back from the inverted position is very hard to do without breaking Lego.. But since i got a lot of support and ideas from you all, i decided to stick to the drum build and not go for a new idea. My goal in the competitions is always to come up with something new or original so i do not just want to recreate the real ride. I want the drum to go inverted, that is what impressed my 5 y/o daughter and the sole reason i went for this prototype (out of 3). I will retry the lifting arm with some of your ideas and if that fails again, i will go for the 2 towers setup (this idea is starting to grow om me since it is a never seen before ride) Thanks for your input and keeping me motivated!
  3. I have considered and tested all these options except for the winch setup.
  4. @Erik Leppen the goal was to invert the drum. I considered winches but it would need one on either side and be perfectly scynchronized. But maybe i will play with the idea first before going in another direction. Thanks!
  5. After a week of trying several setups with huge and sturdy linear actuators ( i even made a curvilinear actuator..) i have to admit defeat considering the movement of the arm, there is just too much force without a counterweight, i could add a few battery packs maybe, but the hinge point would have to be raised a lot, making it very unstable and awkward looking. i could make the arm shorter but that would blow the entire thing out of proportion. At the moment i am looking at a lot of wasted time and considering the amount of spare time i have, For now i am considering 2 options, radically change the design to a ride never seen before, its will be the spinning drum on a horizontal beam that will climb 2 towers and when it reaches the top, the drum will spin around the axis of the beam, still inverting the drum. Or... abandon this one and make my new idea , which is smaller, less thrilling, but a very original build utilizing water... i haven't decided yet..
  6. Marxpek

    [TC14] Excalibur (Top Spin)

    Nice to see this being built! I also considered to make this one (and made a prototype). Your version looks way more complex tho, I do not see why yet, but i will follow this with interest to find out!
  7. 11.1 is its average working voltage. 12.6 is fully charged. 4.2v per cell. Better read up on lipos. They are volatile and needs special care ( and chargers)
  8. I think you will need at least 2 sbricks. Also make sure that there is a voltage limiter on the 3s lipo. It WILL fry your sbricks when fully charged (12.6v is too much)
  9. well at the moment i am struggling to make the arm swing more then 90 degrees without a counterbalance, this means linear actuators are out of the question, the motion on them just is not enough. I thought about making a cycle or switching system to limit the movement, this is the easy part, the initial idea is to use 1 or 2 train regulators for power (and weight in the base) and have a electrical switch limit the motion and reversing it. If that fails i can always integrate an s-brick and just time the cycle with a programmed button, this will be by far the easiest way.. But i have to find a sturdy way to move the arm first, it just cannot be done with an axle, that will twist, now looking into a self made gear rack meshing directly with the turntables, that seems the most viable to me, also using the quarter gear rack does not really work, they are too weak especially the halfbeam cross axle part at the ends and that is where all forces will accumulate.. I hope to get a bit of build time in tonight..
  10. thanks @Bublehead and @mocbuild101 for looking into the real rides, the superstar ride is not what i had in mind, that still contains people with a brace, the round-up was exactly what i was looking for, and what i will build and expand on. Round-up. even the name is deadly (for the ones that do not know: round-up is the name of a very bad type of herbicide, killing any plant in the neighborhood) for now i will call this project "Round up and over" the version i went on did not do this, but i like the idea i might try to implement it! thanks for the input!
  11. Marxpek

    [TC14] Catapultanium

    I really love this concept, will you be hooking the pod and then tension the wires? or will you just make the wires move very fast with the arms?
  12. Marxpek

    [TC14] Gyroscope

    I can't wait to see this thing launch figures all over the place, great (and fast) progress!
  13. Marxpek

    [TC14] The Whip

    Good to see a video on the real ride, i had a hard time imagining it, I am looking forward to see this come alive, but i must admit; i do hope you will push up the speed compared to the real thing, it seems really slow, except for the whipping motion of course, anyway, nice choice of attraction, i never saw or rode one.
  14. Hey all, This is a recreation/expansion of a ride i once went on in my youth, now i cannot find any videos or images online about this kind of attraction, maybe someone else can, but i can very well imagine these things are banned, it kind of lacks a fail safe on a power outage , my version would never pass any inspection i guess, if people would even dare to try... Here is the idea: a spinning drum that presses the people that ride it into the back wall by centrifugal force, there is nothing to hold you in place, except for a dimple in the back wall in the form of a person and a small chain in front of it (which really does nothing except closing your position). after reaching enough speed, the entire drum starts to tilt on a swing arm to vertical position, that is what the ride i went on in my youth did, i will expand on that and try to make the drum go into (near) inverted horizontal position by swing the arm further. For now i have only built a proof of concept, nothing pretty yet, but i had to know if it was doable before presenting anything, i think the test went ok considering the fact it is not 100% built balanced due to colors and minor build variations, as long as you do not move the swing-arm to violently (gyroscopic effect kicks in) the whole runs pretty stable and works well, even upside down keeping the figures in place by centrifugal force until you slow down the drum. (the last heroic figure hung by its feet..lucky bastard! can't have that! redesign needed!) I am convinced i can make the spinning drum work with at least 8, but i am hoping for 16 Technic figures, a total rebuild of the proof of concept will be done later, now i will be focusing on the last big mechanical issue, actually moving the swing-arm, this thing is pretty heavy, and with a spinning drum on it, forces are pretty big and it will have to move slow, so the gyroscopic effect does not destabilize it, very likely i will be using more of the big gear racks to make the arm move, but first i might try to do it directly from turntables mounted in the base of the arm. Let me know what you think! and if anyone knows a video about a similar type of ride i would love to get a link!
  15. @oracid just download the file with your phone. Then locate it and open it to install it. The shortcut will be made automatically. The app should be listed with all other apps after installation.