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Found 20 results

  1. Finally I have an entry for TC13! Since TC12 was such a pleasure and an unthought success (thank you all), it is again big fun to enter this EB contest. I have bought two PullBack sets - just for the parts - two years ago, and the motors were laying in a box since then. To enter this contest, I had to find out which abilities the PBs have. Conclusion: it's heavy, has high speed but low torque, for a ridiculous short period of time, and stresses the parts around it a lot during wind up. But it's compact and doesn't need a BB. The first three weeks were just testing. I tried gearings, two PBs, escapement, gearboxes and so on. Nothing really satisfied me, while I don't want to build a car, but also nothing stationary. After at least fifteen revisions, this is where I ended up with: A Pull Back motor and a pile of parts ... good enough for a proof of concept.
  2. TECHNIC PULLBACK CONTEST RESULTS Congratulations to all the winners! 1st The Tiger Pull Bug by MegaRoi Discussion topic 2nd Pentagon Clock by Didumos69 Discussion topic 3rd Top Fuel Tractor by Anto Discussion topic WINNERS1. The Tiger Pull Bug by MegaRoi - 295 Points2. Pentagon Clock by Didumos69 - 205 Points 3. Top Fuel Tractor by Anto - 115 PointsRESULTSCONTEST RESULTS1. The Tiger Pull Bug by MegaRoi - 295 Points (53 votes, entry 10)2. Pentagon Clock by Didumos69 - 205 Points (39 votes, entry 24)3. Top Fuel Tractor by Anto - 115 Points (32 votes, entry 2)4. Steampunk Clock by Ludo Visser - 84 Points (19 votes, entry 15)5. Wind up tracked racer by Marxpek - 79 Points (16 votes, entry 19)6. Mini table clock by Davidz90 - 78 Points (15 votes, entry 8)7. Bridge by nick97 - 73 Points (18 votes, entry 9)8. Volvo Iron Knight by Jurss - 66 Points (18 votes, entry 12)9. The Click Counter by schraubedrin - 66 Points (14 votes, entry 25)10. Powerful Racing Truck by super-jaschka - 49 Points (14 votes, entry 14)11. Twinrotor Helicopter by Rudivdk - 48 Points (14 votes, entry 22)12. Roadster 2 by Zerobricks - 44 Points (17 votes, entry 16)13. Pullback Motorcycle by Offroadcreat1ons - 38 Points (12 votes, entry 13)14. Crossbow by Seasider - 35 Points (12 votes, entry 11)15. Mini Tumbler by bastie77 - 28 Points (8 votes, entry 18)16. Retro-futuristic Racecar by Xewyz2001 - 26 Points (9 votes, entry 5)17. The Thunderer by juGSI16V - 23 Points (6 votes, entry 1)18. Sprite by februar88 - 6 Points (2 votes, entry 21)19. Traxxas Slash by DamonMM2000 - 4 Points (1 votes, entry 6)20. Super Shock Buggy by TechnicRCRacer - 4 Points (1 votes, entry 20)21. Formula One by Cogliostro - 1 Points (1 votes, entry 4)22. Pull Back Race Buggy by Horace T - 0 Points (0 votes, entry 23)CONTEST SUMMARY Scores and stats don't entirely match due to disqualification.
  3. TECHNIC PULLBACK CONTEST It has been suggested quite a few time, so here it is. The Technic Pullback Contest. A simple and short contest to keep you busy during the holidays. DESCRIPTION Build a Technic model with one or more pullback motors. You can't use Pneumatics, PF or other electronics, just the pullback motors. DEADLINE Deadline date is Monday 29th of January, 2018. Contest will be closed on Tuesday 30th of January, OR LATER. Disclaimer: I will close the contest when I see fit and when I have the time to process the results. This can be later than the deadline date. Please don't complain about this not being fair and all. RULES AND REGULATIONS The following section describes the contest specific and general rules and regulations. But before that, please take notice of a simple motto regarding the Eurobricks Contests: CONTESTS ARE FOR FUN! Of course there's competition, but at the end of the day, LEGO is just a hobby and the main goal for each of us is to have fun! CONTEST SPECIFIC RULES AND REGULATIONS Each entry needs to have a NAME (no name, no entry). Only OFFICIAL LEGO PARTS. 3rd party STRINGS, HOSES and RUBBER BANDS are permitted. NO 3rd party tires. There is NO size limit. Model Team style building IS allowed. GENERAL RULES AND REGULATIONS The contest is open to all EB members (also new members). Members who joined EB after the start of the contest can be banned from voting (when vote rigging is suspected). Voting rules will be explained later in the voting topic. One entry per member. Entries need to be new (never posted anywhere previously or shown at an event/LUG meeting). Only physical builds, so no LDD or other virtual entry. If you have any doubts about the suitability of your entry contact me, or Milan. All entries are to include only real LEGO. No clone brands, 3rd party parts, or digital entries allowed. Custom stickers are allowed. No cutting, sculpting or modifying parts. Entries are to be placed in the entry topic in this forum. Entries not in the entry topic are not eligible for voting. The entry post may be edited at any time up to the end of the contest, so feel free to make improvements if you wish. The contest might be closed later than the deadline. Don't complain about this not being fair. You have enough time to build. Don't ask for more time. We reserve the right to disqualify any entry that does not follow these rules. These rules can be changed whenever we see fit to ensure that people follow the intent of the contest. Jury members are not eligible to participate. WHAT DO I NEED TO ENTER? All participant need to create a discussion topic and create a post in the entry topic. DISCUSSION TOPIC A discussion topic starting with [TC13]. A discussion topic needs to show some actual progress (i.e. pictures of the build in progress) and should NOT be used to "reserve an idea". ENTRY POST The entry post in the entry topic should contain: Entry name. One or more pictures (max 3 of max 1024x1024). Embedded video (mandatory). Link to the discussion topic. VOTING Voting scheme will be 50-50, so member votes count for 50% and jury votes count for 50%. Voting criteria are (in no particular order): Originality. Looks (shape, color scheme etc). Quality of the build. Functionality. PRIZES Top 3 winner will get a medal tag, frontpage and entry in the HoF. No actual LEGO prizes are offered in this contest.
  4. My TC13 entry redone: the IAERO 1800+ In my opinion, it is very beautiful, my best pullback ever! Competition pictures Video soon. Thanks for your time, and see you at the finish line!
  5. So when I read about TC13, I first had something huge in mind... But actually I think the pullback series are cute because of what they are: small, simple and quite fast. So I decided to keep in the spirit of official pullbacks, and keep it small. However, I did not go for the obvious racer or offroader car, I want to do something not done before (at least not by TLG). So I went for a helicopter. The type was not a difficult decision: after watching barmans incredible avatar helicopter numerous times, I wanted to do one myself. So how to make a pullback work without any wheels... Here is the proof of concept result of tinkering an evening with two pullback motors and some rotors: And a video of it in action. I'm actually quite happy with the way it works, although it does not use the full extend of the windup mechanism. So I'll stay with this concept and try to refine the looks in the coming period.
  6. Pentagon Clock This is a wind-up pendulum clock powered by two pullback motors. This clock is not true to real time but rather focuses on features such as a wind-up mechanism, pin wheel escapement and three concentric hands. It has been built completely in-system and can be reproduced without any fine-tuning, except for making all gears run smoothly of course (LXF-file here). The clock has a very consistent autonomy of 18 minutes. It features: A wind-up mechanism - A differential is used to prevent the hands from running counterclockwise when winding-up the clock. One of it's outputs is locked by default and slips during wind-up. Pin wheel escapement - Instead of using teeth, the escape wheel has three round pins that are stopped and released by a scissors-like anchor, which has been integrated in the pendulum. Three concentric hands - Planetary gears and a differential house make for a fictitious LEGO time system with 2 hours in a clock revolution, 5 minutes in an hour and 30 seconds in a minute. The pentagon-shaped clock face refers to the 5 minute hour. All features have been originally developed for this contest.
  7. Hello everybody, I've been reading these forums for well over two years now, but this is actually my first post. I'm usually not the most outspoken of persons (to put it mildly) and I mostly feel I don't have much of significance to add. TC13 however compelled me to finally break my silence. I'm a big fan of the little pullback vehicles and my favourite technic MOC is also one of those. But now let's get on with the topic. A strange black vehicle has been racing around in these parts: I also managed to take a spy pic (unfortunately it turned out mostly black, or maybe very, very, very dark grey): I'll try to get more details soon. Stay tuned. Sebastian
  8. TECHNIC PULLBACK CONTEST CONTEST INFORMATION More information about the contest can be found in the general discussion topic. WHAT DO I NEED TO ENTER? Please take a careful look at the rules before posting in this topic. Each participant is obliged to create a post in this entry topic. Posts need to follow the rules stated below. Posts not following the rules will be disqualified so please read them carefully. ENTRY POST The entry post in this topic needs to contain: Entry name One or more images (max 3). You can have combined pictures (4 in 1) as long as the picture isn't bigger than 1024x1024. Embedded video (mandatory) Link to the discussion topic IMPORTANT This topic should be used for entries only, so commenting is prohibited. Please use the general discussion topic for...well, general discussion on the contest, and individual discussion topics to comment on the individual entries.
  9. There is a mechanism i wanted to build in lego for some time and TC13 was the ideal motivation to do so. I don't dare to call it a clock, so it's a Click Counter, counting it's ticking Sounds by a set of hands Those are the specialities of this machine: The motor can be wound up without interrupting the workings of the mechanism. That's because input (wind-up-mechanism) and output ("counting"-mechanism) are connected like planetary gears. This way only torque gets transferred from in- to output, no rotations (the rotations go into the wind-up motor): Then comes the mechanism i tried to recreate: the constant-torque-converter. The main problem of wind-up-motor powered clocks is their inconsistency. The torque acting on the mechanism changes quite a lot over time, not a good property for a mechanism relying on good timing. This mechanism converts the energy from the spring into potential energy by gravity through lifting a weight up (weight block in the centre of the picture). By turning the lever only a few degrees from horizontal, the torque generated by the weight remains nearly constant. But there is a catch: a weight hurled upwards by a freshly wound up motor gains quite some speed and destructive power. To counter this, i built an aerodynamic dampener (left side of the picture). That's fancy for "fast-spinning fan". Not only does it control the movement, it also looks really cool in action Due to the nature of LEGO, there is a lot of friction. I could make the mechanism more reliable by lengthening the "sensor-lever" pushing on the Liftarm 3 x 3 L-Shape with Quarter Ellipse.(invisible on the right side of the picture) But in the end this whole mechanism burns a lot of energy while making the machine unreliable. Still, i love how it just "recharges" itself every now and then And finally, after some informative videos from @Davidz90 and a little bit of encouragement from @Didumos69, i managed to design a working escapement yesterday. Completely in System and geometrically locked (meaning the parts won't move over time). It's even surprisingly reliable. The clock face was put together tonight quick and dirty (like, admittedly, the whole machine). Using the 28 tooth turntable left me no choice but to give the hands a ratio of 1:7. In the end i'm happy to have found an integer solution. And finally, here's the video i spend far too many hours on, concerning the low quality of the result : At this point i don't even know whether i should enter the competition. As you can see the model is an unfinished mess and i doubt i could build it much nicer, especially not until tomorrow evening. Furthermore i made no pictures of my prototypes, so i don't even know whether this entry will be allowed. On the other hand, i think those mechanisms are really cool and interesting and worth a second look. What do you think? Would this be a worthy enough contender?
  10. I have one of the old pull-back motors, which, as @Aventador2004 noticed, unwind really, really fast. I quickly realised that if I wanted to build anything but a car, I needed something to let it unwind in a controlled manner. For example, an escapement, like in a clock. Unfortunately, @Didumos69 posted his topic while I was working on my proof-of-concept. I guess there's no rule against having the same idea, but I'll think about if I want to build a clock or something else from it Anyway: here's a proof-of-concept to show that the idea works. I shamelessly borrowed one of Ben van de Waals escapements (W40,, which works great. Now to figure out a ratchet mechanism to wind it. To be continued PS: sorry for the filming-through-a-vertical-mailbox-opening, but my phone was the quickest way to get a quick video and I still don't know how to use it properly If anyone can tell me how to change the aspect ratio on the iPhone, let me know.
  11. Hello everyone! I watch a good party out here. I could not resist and also decided to take part in a race Truck. The model only took 419 parts + pullback engine. For better visibility with a racing truck, v-12 is being installed by Paul Boratko (aka Crowkillers). Heavy-duty front bumper, large rear spoiler and huge chunky tires. Activate the powerful pull-back motor...
  12. Hey everyone! Today I'm presenting my TC13 entry, which is a pullback motorcycle. I actually built it before Christmas but I was never in the mood to show it, except for the holiday version on my YT channel. I don't think it qualifies as a café racer or a dirt bike, so I'm just calling it a motorcycle. It was based off of this: I'm not a big motorcycle person, so I don't really know what type this is. Here are some pictures. As you can see, the motor is connected to the back wheel by gears. The front wheel steers, and both wheels have suspension. Thanks for reading. Tell me what you think!
  13. VIDEO: Current Version: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Old Post: Hi! I have decided to enter the TC13 contest and here is my entry so far: It has suspension on both axles and a working V4 engine. It looks a little funky right now, but I am thinking of how to change the front for the better. It has the modern pullback motor in the back. Please give me any advice you have. Back:
  14. Hey all, At the last day of the year I want to show you my build for the bull-back contest. The motor is winded-up using the wheel and relaesed by pusing the axle beside it. From the motor to the clutch it is geared using a 12/36 and a 8/40 combination. After the clutch there is also a 12/36 reduction. If I turn the wheel 4 times around and release it, then the second 36 tooth gear turns almost half around. That is enough for lifting the road completely. I added the clutch for some kind of safety. In neutral I won't wind-up the motor when lowering the bridge. And a video: Next step is building something to slow down the motor. Comments are welcome!
  15. Good day. This wasn't really supposed to be a retro car, but while playing with different shapes out of flex-axles, the folllowing car was made. Statistics: -power by 3 pull-back motors on rear and 1 on front -max speed of 1'77 m/s (~6'37 km/h) Video & photos: More photos in my Flickr album here
  16. Yesterday i had an insomnia, and i decided to make something for TC13. Actually i finished with my "Sprite" at all. But now i want to show my progress throught the night. Core idea - to make some funny jdm-style car with stance. Now it looks little bit different I have to make a video and make an entry post.
  17. Seeing the basically non-existent number of lego headcrabs roaming around ravenholm, I decided to step in and build one for TC13. My initial idea was to build one that moved its legs, but wanting to shake my dust I got a bit ambitious and started thinking of mechanisms that would allow it to jump, even though it'll probably be a very small jump (hop maybe?). I threw together a proof of concept for the mechanics just to toy with the idea: The red liftarms will be spring loaded manually and held in place with a ratchet, which will be released by the linear actuator, but this solution may release the ratchet too early. Another option is to disconnect the actuator, move it back a bit, and adjust the distance so that the tip of the la will release the ratchet near the end of its travel (or depending on where on the headcrabs horizontal travel I want it to jump). After I toy with the mechanics and see if I can make it work or not, I plan to build a light body mostly with panels to keep the weight down. All opinions/suggestions are welcome.
  18. This is 3rd thing I tried to build for TC13. For my own surprise, this was very fast (started just yesterday afternoon). Volvo Iron Knight (if somebody here doesn't know) My model has two pullback motors working fake 4cyl engine it is almost in scale with tyres Some bad video
  19. First I wanted to build some windup mouse, but, when I started to put something bigger, it became more like rat, or even some capibarra by the size. So abondoned this idea. Now I will try to build something like Tyrell Not shure about rear axle rigidity, but looks good :) . Front axle is "floating", so that front wheels are in contact with ground. two times tyrell because
  20. For my entry, I decided to make something nice and simple... And this is what I cam up with: It's a wind-up motor inside a 6x6 box, that moves the legs of the Technic guy, creating the illusion that he is pushing the box. Video: As mentioned in the video, I have also made instructions for this, which are available for free on Rebrickable. POV-Ray render: Some LDCad animations - rendered with POV-Ray: