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Found 17 results

  1. Imma start a dedicated thread for this set as well. All info so far: Rough terrain crane 4057 parts 229 Euro 1 meter telescopic crane. With power functions. Largest TECHNIC set for parts. 4 wheel steering. V8 engine sticking out at the rear, uncovered. Unimog wheels with covers. 5 motorized functions: - Raising boom - Extending boom - Lowering winch - Lowering outriggers - Rotating superstructure B mode: drilling vehicle.
  2. Hello everyone. Happy to present my latest MOC: LIEBHERR Concept Mobile Crane. All motorized functions: - 3 XL for propulsion (1 for each axle) - Servo for front axle steering - 1 PF L - outriggers - 1 PF M - 360 degree tower rotation - 1 PF XL - custom wormgear actuator arrow control - 1 PF M - string based second stage - 1 PF M - hook control - 1 PF lights - 2 light bricks - 1 Buwizz 2.0 - 2 battery boxes 8881 - 1 train battery box 88000 - 3 IR recievers - 1 pole reverser Manual functions: - Openable hood (V6 line engine + propeller;)) - Openable doors - Full cabin detalization for 2 persons - Openable engine compartment (inside the cabin) - Openable side compartment (access to train bb) - Openable hatch under the arrow (access to Buwizz) - Full crane cabin detalization - Openable tower engine compartment (access to BBs) MOC done in the scale of ~ 1:11. Parts counting around 7k. Tbh I lost the count somewhere around 4k when it was body only. Weight - 7 kg. Dimensions: 0,86m long (0,98m with arrow) x 0,3m width x 0,32m height. Note that: From the very beginning, it was not the purpose to make a full scale 1 to smth copy of a specific crane, but rather make a functional crane with the features of a real one. If you did not follow the topic when it was only WIP - sad to say that I had to make hard front axle because it was getting really heavy. The 2nd and 3rd axles are made as pendulum suspension with 6.5 hard shock absorbers to support. Of course with the weight all of the offroad utility was shaved down quite a lot. Drastic contrast from the original 3axle cranes is the body length and outriggers design I guess. All other mechanisms are here. More photos at: https://bricksafe.com/pages/gate/ural-4320-trial-truck/leibherr-ltm1060-3.1-mobile-crane WIP videos: To conclude this MOC: This was a really hard one, cannot even count the times I staggered in thinking of what and how to do next. But I always had general idea which helped me finish the MOC. As well as people who gave me some ideas in this topic specifically. So special thanks to @suffocation, @Erik Leppen, @BrickbyBrickTechnic! Also thanks to 42055 and 42082 for that they exist. This was a huge experience to me and the first mobile crane I've built myself. The general notes I took for myself were: - always plan outriggers before or at the early stages of the chassis; - suspension is not the best idea for a 7 kg crane; - if your model is really huge and heavy - drive it as the stages of building go, with extra weight it starts acting completely different. - think twice before naming your MOC
  3. I've been floating around EB for a while, so it's about time I share my first Technic MOC: Mid-Scale 5-Axle Mobile Crane MOC. by jwarner1718, on Flickr Between wrapping up school and work, I've spent a lot longer on this project than I had anticipated, but I'm very pleased with the result. The finished model is around 950 peices, and with full manual functions: Four-axle steering One stage outriggers Boom extension Boom raising/lowering Superstructure rotation Cable extension/retraction Opening doors With the exception of the doors and superstructure rotation (which are operated simply by hand), all functions are controlled using 12T gears at the rear of the model. I made consolidating the controls a top priority since a lot of manual MOCs have control knobs all over the place. The lower superstructure gear operates both the boom extension and the raising/lowering, and there's a switch on top of the superstructure to switch between the two. Mid-Scale 5-Axle Mobile Crane MOC. by jwarner1718, on Flickr Mid-Scale 5-Axle Mobile Crane MOC. by jwarner1718, on Flickr Mid-Scale 5-Axle Mobile Crane MOC. by jwarner1718, on Flickr Mid-Scale 5-Axle Mobile Crane MOC. by jwarner1718, on Flickr Mid-Scale 5-Axle Mobile Crane MOC. by jwarner1718, on Flickr The crane measures 14" long (36 cm) with the boom down, and the boom itself can be raised to almost 18" (45 cm). Let me know your thoughts!
  4. After seeing @jwarner's excellent smalle crane and @Ludo Visser's WIP on a good looking undercarrage, I kept being reminded I still had one of these on my "to-do list". It's the last (I think) in what turned out to be a series for me of small versions of vehicles that are usally the big 4 "flagships" in Technic that return every couple of years. It features: - Boom lift by pneumatic cylinder - 1 stage boom extension - Rope (with old school 90's lock and also a hook from the 90's ) - 3 axle steering with different steering angle for the front wheels (bottom 12T bevel gear at the rear) - Working V4 (allthough a little out of sync, can fix that as soon as Lego actually makes parts to shift direction at this scale on 1 stud instead of 2 ) - Cabin tilt on the superstructure (through a worm gear controlled by 12T bevel on top) - Superstructure rotation (top 12T bevel gear at the back) - Outriggers (couldn't fit a central operating method so they are moved at the rear through the LBG crank shaft parts usually used for fake engines) Stuff I couldn't squeeze in no matter how hard I wanted to: - 2 stage boom extension (with 11L thin pneumatic cylinder). I tried, but with ropes in play I was looking at a 2 studs wide crane without a shell to give it ridigity, anything with 3 and 4 studs in width with the shell still felt very flimsy. And shortly after switching to a 1 stage boom with these 11x3 panels I really started to like that clean look on the crane vs the thin liftarm extravaganza I had in play earlier - A diff (or at least have the fake engine run in some form on both non-steering wheels). I barely managed to get 1 wheel driven. Had to use some ancient 90's Space Shuttle technique with a rubber band to get the stuff routed. I considered a blue clutch gear from the Chiron on the steering shaft, but besides that really killing my ground clearance it wouldn't fit up top thanks to the pneumatic cylinder. Why not leave the feature out? Can't do that when all the other mini's I made had fake engines. It was this or never getting finished pretty much - And as mentioned earlier: the outriggers being controlled by 1 knob. Couldn't route it to the rear, already crowded, the cabin in the front was blocked by steering angle of front wheels and crane up top. I am happy though that they at least can lock into place and lift the whole vehicle. And a couple of more images: Instead of messing with the length of the hubs on the 2 rear steering axles to get different steering angles, I shortened the front steering hubs by 1 stud to get a sharper angle with space lost in height (rear of the driver's cabin) but not in length. It's turning radius is pretty sweet, very small. Tried to get some details in the cabin, but they are missing half of their bottom seats thanks to the steering wheels. Also messed around a little with options to get the outriggers folded into the body as much as possible, not sticking out more than 1 stud up top and when extended looking at a decent angle. Hmmm, now that I am looking at this picture, perhaps I should swap the 4L thin levers for LBG or something to make the fake engine "pop" from the black chassis. Anywho, thanks for watching and reading.
  5. Since the beginning of my AFOL-hood, I have been a crane guy, with many mobile cranes built in the past. Now, during the more recent years I tried to diversify, partly thanks to competitions like those on Eurobricks, and built various other vehicles. I think it's time to see if I haven't unlearned how to build a crane :) So, the goal. I aim for a five-axle crane in the same scale of 42009. I think five axles is a perfect balance: enough to be imposing, but not so much it becomes awkward :) I use the Liebherr LTM1200 as a source of inspiration. The extra space between axle 3 and 4 gives me some extra leeway, but I also find it to look better. This image is from the Liebherr folder; I drew a grid over it with 8 studs for the wheels, and some markings in red. Most functions will be manual. Not sure if I can even get a motor in, but I will try. But there is one function I really want: suspension. I think it just looks cool to have a multi-axle vehicle with suspension on all wheels, and it makes my model less of a 42009-clone. To do this, some other functions will have to be dropped, like the motorized double-acting outriggers. This is the progress so far. Each axle is a fixed unit that is connected to the frame by two shocks and two ball joints. As vertical space is limited and Lego suspensions always tend to become taller than desired, I had to find a way to create a sturdy frame, so I went for studded Technic bricks. This makes the frame very strong. Also I think it's a nice deviation from all-studless building :) (This will principally be a studless model, don't worry.) Then, the steering. If you ever want to add and connect the steering to so many suspended axles, let me warn you: it's not fun. Every axle needs two U-joints. I just ran an axle with lots of U-joints (at least 6) through the entire thing. Not optimal, but it works. The outrigger housing is a real pain to work around. Steering angles per axle are varied the 42009 way: by having different steering arm lengths. The ratios are 100% : 50% : 0% : -67% : -100%, or, in easier numbers: 1/2 : 1/4 : 0 : -1/3 : -1/2, where the denominator is the length of the steering arm. Axle 3 is the only axle connected to the fake engine. Speaking of which, there's hardly any room left for that! So I decided I will add a boxer engine (which is lower), and it will still have to stick out one stud above the roof of the cabin. So be it. Driving the fake engine will be a challenge by itself too, because the unwieldy geartrain for the front axle's steering is in the way. I will have to sacrifice a lot of ground clearance for the driving axle. Next up: add the fake engine, add the outriggers, lay out the measurements of the cabin, and see if I can get the first boom segment in place. One note about colors. It will not be yellow. I just don't want to add another yellow crane, but I'm still in doubt about color options. I love trying out weird color combos as you might know, but the boom will probably be white, because of the panels I have (thanks to 42025). So I will probably do a multicolor scheme where white and black/gray are combined with one or two non-grayscale colors. I love to hear what you think of the first take :)
  6. Somehow the thread was duplicated. Please delete this thread dear Moderators.
  7. The original builder is member of EB, but doesn't post here often. Says he is having difficulty with logging in so I am posting this here for him. Needless to say, wonderful and accurate build. I only wish there were a video. The amount of functions fit into a model at this scale is terrific, and boy, does it look great!. All five axles are with suspension. Four stage boom where the height better resembles the real thing. Check out the link for full details, and I have posted some pictures as well. http://www.moc-pages.com/moc.php/443667
  8. Not sure if the builder is a member on here or not..... but if so, would love to see additional pics of this beast, video, or at least some additional information. As a builder of several large mobile and crawler cranes, I can really appreciate this build, even if the looks are little off. This may be the largest mobile crane out here (in Technic bricks). Those are PP puller tires, BTW...... Just thought I would share....found it on brickshelf http://www.brickshelf.com/cgi-bin/gallery.cgi?f=565012
  9. More than month ago I've decided to begin building my biggest and most challenging alernative model so far. It will be forwarder (log loader) built out of set 8053 - Mobile Crane. The first issue was how to build complex crane with just one linear actuator and limited amount of gears. I've solved it by using worm gears instead of linear actuators and it works good. This is the first working prototype of rear part of forwarder: Then I've begun working on cab and this is the second version of it (you can aslo notice minor changes in crane): When I've showed it to my wife she told me that cab is too high and angular. What do you think about it? And last picture of forwarder ready to grab something: Few features and specifications: 4 axles with articulated steering working crane: rotation around vertical axis, lifting boom by wormgear, lifting stick by linear actuator, opening grapple by worm gear crane is operated from chassis (1 black axle connector and 2 red axle connectors) rotary seat in cab (not built yet) opening engine cover with fake engine (not built yet) target number of parts: 1000+ Few issues to solve: steering on smooth surfaces - wheels offer big resistance but it's OK on carpet overall design lack of useful parts Any comments and ideas for improvements are welcomed.
  10. some of you have maybe seen my video with the of the xl actuator and how the boom is bending under the load. here are two pictures do you have any ideas to prevent this.
  11. Here's a small scale mobile crane loosely based on the Liebherr LTM 11200. Not all of the details were implemented due to scale, since I wanted it to be functional and detailed. There was also a little bit of cheating with the counter-weight being a slab of steel taped on (it would've taken too many of bricks otherwise). The images don't seem to be embedding so links will have to do for now. Here it is with luffing jib and super-lift. Full height Better view of winches and super-lift Truck Loading counterweight and auxilliary winch Semi transport config Transport config
  12. Hello everyone This is my first MOC shown here: Mobile Crane GROVE GMK 4100B in ~ 1:22 scale. And real crane... All functions are motorized. Crane is driven by PF XL for all wheels. Steering by PF M with clutch also for all wheels. 1 and 4 axles have the same turning radius, 2 and 3 axles have the same turnig radius also but it's less then in 1 and 4 axles. Superstructure rotated 360 degrees by 43362c01 motor. Other functions (outriggers, boom liftdet and extended, winch) are motorized by 4x PF M. I like when MOC have a lot function and looks very good, so I decided to built some details ;) Photos: And a movie showing how it works: Brickshelf gallery: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=546806
  13. Hey everyone. I've been registered on Eurobricks for ~ 1.5 years under a different account, but I decided to standardize all my lego related stuff across one gmail, youtube, and Eurobricks account (and blog URL of which there is nothing on it). My other account here only had 12 posts anyway, so no big loss. I'm making this build thread because I wanted to share the progress I've made so far on the giant mobile crane I'm building. I refer to it as a "giant mobile crane" because it's not replica of an existing crane. If you were to compare it to anything it would be a chassis similar to the Liebherr LTM 11200 9.1, with the outriggers of the LG1750. The main boom WILL NOT lift or operate like a traditional mobile crane boom. The reason for this, is that at this scale I don't feel lego does well in cantilever. Instead, the boom I'm building will be 4-5 seconds, each section being at least a meter in length but they will only extend straight up. At the top of the boom will be a short (less than a meter), but stout lattice luffing jib. The turntable for the boom will be at the TOP of the boom and not at the bottom like most mobile cranes. Even if I make the most stable reinforced turntable I can think of, I don't think putting it at the bottom of 5-6 meters of lego is a good idea. There will be the issue of what counterweight system makes the most sense for a crane of this type. Haven't figured that out yet. If this crane really existed it would be special use to erect wind turbines. The crane has a lot of height and decent lifting capacity, but only at short radii. The other main difference is instead of two hydraulic pistons (well, the lego equivalent is two gear rack pistons, or two string extended pistons) the main boom will be lifted by a collapsing triangle. Imagine the boom laying horizontally, then imagine a stout A frame also laying horizontally but connected to the mid-point (or slightly above the mid-point) of the boom. The bottom of the A-frame and the bottom of the boom are connected with string. As the string gets shorter the triangle collapses and the boom is forced upwards. Since string can handle lots of tension and it's easy to create a pulley system I think even an extremely heavy boom (40 pounds?) can be lifted without straining the legos too much. The legos mostly undergo compression under lifting which they should handle just fine. The color scheme for the crane is yellow with black trim and L bley panels for the deck (because I have a lot of those heh). I'm a real sucker for standard Technic yellow and black. Key features / functions of the crane. The starred ones I'm not sure about yet. 1. All wheel steering 2. Two steering modes (minimum turning circle and crab steering) 3. Third steering mode of reduced rear axle turning (for city driving)*** 4. Fourth steering mode of rear axles locked (for highway driving)*** 5. All wheel independent suspension 6. Pneumatically adjustable suspension (technically when one pneumatic cylinder compresses it affects the others, but not that much so I'd still call it independant suspension) 7. 4 speed gearbox 8. 3 speed gearbox plus reverse and a one-way clutch*** 9. Giant outriggers that extend, telescope, and deploy. 10. Giant outriggers that with the help of other non-telescoping or extending outriggers near the front and rear of the vehicle lift the vehicle from the ground.*** 11. Pneumatic outriggers*** (I have enough LA's already, but I'd have to buy a LOT of pneumatic cylinders to do it pneumatically. . .not sure if I want to do that)*** 12. Brake Lights 13 Turn signals 14. Turn signals that are properly synchronized in the front and rear of the vehicle*** (I know I can get them in the vehicle but not sure if I can make them sync up) 15. Low beams 16. High beams 17. Working steering wheel 18. At least a few other MISC cabin features (adjustable seats, locking doors - windshield wipers would be a fun one if I have space for another motor) 18. The fake engine will be a compressor made of 6x small pumps. I don't think I'll include the standard Technic fake engine. That compressor will be used for the suspension, and potentially to pneumatically lock the boom in a vertical position. 19. Full RC except for high and low beams and windshield wipers or any other vanity features added (flashing lights, etc) For the boom and crane: 1. The boom, jib, and counterweight assembly will be detachable from the vehicle. All electronic systems will be separate. In real life, for a crane like this the boom would be brought in on a separate truck. I currently don't have any plans to make a a truck (but who knows. . . ). I'll probably "cheat" and place the boom on top of my model with my hands, but no other connections will need to be made. 2. The boom will be at least 4 and possibly 5 sections. Not sure exactly how long each will be. 3. The boom will be erected by a collapsing triangle pulled together by string. 4. The boom will extend up one section at a time and each section will lock in place. The "ram" that will extend each boom will also be string powered. 5. For the ram that extends the boom I'd like for it to run at a slow speed when lifting, and a very fast speed when descending***. I think this can be done with differentials. 6. The same motors that erect the boom might also extend the boom*** (probably 4x XL motors) 7. The turn table for the boom will have at least 3x bearings. A large ring bearing at the top, and then two. . . .are they trust bearings? I forget the word. . .but anyway, two additional bearings that extend down into the boom to keep the upper rotating structure stiff in all directions (I HATE slop) 8. The counterweight assembly will automatically unfold into the correct orientation under the force of gravity. *** 9. If that doesn't work I'll use LA's to position and lock things into place. 10. The luffing jib will luff of course. 11. The main winch I'm hoping can lift at least ~ 10 pounds. The max weight will be mostly contingent on how I design the counterweight system. Well, that's about all I can think of for now. I'm sure you can read all that and say "whatever. . . who is this guy. . . he really thinks he can build that?" I really think I can. It will take a long time, but I'll get it done. I have an engineering mindset and I understand simple mechanics extremely well. When I was a kid (maybe 10 or so) I built a mechanism similar to the automatic axle sorter, but alas I have no record of it (this was before digital cameras and I never thought to photograph my stuff). While I did take a long break from building with Legos, and Technic changed from studded to studless during that time period, I still grasp this stuff really well. Ohhh yeah and a little about me. I'm 30, I'm married (my wife supports my hobby as long as I start writing about it). I coach triathletes and cyclists. I'm in the twilight of my photography career (in fact, I probably shot my last event earlier today). I work from home so I have a lot of time to build. I have two cats which will one day knock over one of my lego drawers for sure. I live near Atlanta, GA. I went to Georgia Tech, but I have a Business Management degree, not an Mechanical Engineering degree (ohhh well. . . I never could have held an office job anyway). I swam in college and I still compete in triathlons and bike races. Here are three videos with a tour of my lego room, an explanation of the steering of the crane, and an explanation of the drivetrain. I WILL get better at making videos as time goes on. First time you do anything you're the worst at it you ever are. That's the first time I've made a lego video, so they're the worst ones I'll ever make. In the future I'll edit them. While I have worked as a photographer, and I even worked on a movie for 2 months, I haven't created many videos for my own purposes. Also, here's a link to where I'll dump periodic pictures of my build. You can see a failed design path I went down a long time ago as well as some of odds and ends. http://www.sammorgan...26491&k=7pzdqqw
  14. Hello! I'm finished with uploading and lot of work, you can see one of my biggest and most complex moc. I always loved mobile cranes, so I decided to make a Liebherr LTM 1090 with medium sized (62,4 mm) wheels: folder with bigger pictures: http://www.brickshel...ry.cgi?f=533546 big montage: http://www.brickshel...90-62mm/002.jpg boom: http://www.brickshel...ry.cgi?f=533548 details: http://www.brickshel...ry.cgi?f=533547 About the mobile crane: Every function is remote controlled: - driving (1 XL motor) - steering (1 M motor) - outriggers outcoming and legs moving (1 pneumatic circuit with rubber band "control", 1 M motor for pneu switch) - upper structure rotating - boom raising - boom extension - winch (hook) - compressor for making pressure - front lights (together with driving (and steering with "turn signals") ) After outriggers, these functions are working also with one M motor, or directly from the receiver's output. Dimensions: Length: 610 mm Width: 135 mm Height: 211 mm Scale: 1:20,5 Dimensions with raised and extended boom: Length: 1235 mm Height: 1260 mm Other dates: Number of pieces: 3433 Weight: 3460 g Building time: 23 days Speed: first gear: 0,14 km/h second gear: 0,23 km/h third gear: 0,38 km/h fourth gear: 0,55 km/h Maximum boom extension: DETAILS: Flashing light in the back (made with two light brick, but one is covered with that black piece): Lights: Exhaust: Instrument panel: Manometer (for seeing the outrigger's pressure) and gearbox (manual) cover (the dkbluishgray one): You can use the airtnak in the pneumatic system, or not, depends on these two pneu valves: http://www.brickshel...90-62mm/024.jpg Truck The truck part is an 8x8x8 driven construction ( http://www.brickshel...y.cgi?i=5936235 ), with a manual gearbox and One Xl motor for drive. The outriggers are working with pneumatic, as can be seen in the pictures, one motor with pneu valve is enough for control, because the backward movement is done with rubber bands. The pneumatic system is enough strong to pull out the rubber bands and lift the mobile crane's own weight. http://www.brickshel...y.cgi?i=5936260 - I simply wanted to try out this solution (the original also has also a clyinder to push out the legs). It doesn't works 100%, sometimes a little help is needed to came back. The motorized pneu valve isn't my idea, I saearched a lot to find the designer, but it wasn't success. A compressor makes pressure in the aritank (or directly to the legs, see the description above), then the valves can be opened or closed. The PF system has 8 channels overall, so some functions are together with other ones, like the front lights with steering. One PF led is for light. Crane part (upper structure) The most important in this part is the strenghtening in the turntable, I made it with 4 pulleys, and 2 mm width rubber bands (O rings): http://www.brickshel...y.cgi?i=5936256 Works, well, in extended state the boom doesn't deforms the structure. The 4 pneumatic cylinder can raise the quite heavy (3 section) boom, but not in extended state (as most of the originals). The whole boom can be extended up to 1260 mm height. The backward movement is done with strings, not with gravity, it's more reliable. One small Li-Po battery can power the machine, this black button is for power on/off: http://www.brickshel...y.cgi?i=5936219 http://www.brickshel...90-62mm/004.jpg - you can switch after the operator's cabin with the dkblgray pneu switch to raise the cabin in angle or not (done with one little pneu cylinder). This video can tell more than me, it took me a time to make it, but it's necessary for this model: Hope you like it. Maybe I didn't write everything, feel free to ask, if something isn't clear.
  15. I know I'm a bit (quite a lot) late with this video, considering how long ago this set was released, but better late than never! The description: "Yay, I finally found time to make another video! In this video, I learned how to adjust brightness within the video clip, played with keyframes for audio fade in and fade out as opposed to using Adobe Soundbooth, thereby making the entire process faster, and upped the usage of cross-dissolves and title cards. My most professional video yet, I think. Also, there's a fancy new intro graphic!" "On the other hand, I'm not happy about the shoddy camera work and the dismal lighting. As I didn't really plan out the shoot *at all*, I was limited in the space I could work with and settled on a temporary camera mount. I intend to get a GoPro tripod mount, but in the meantime I'll have to cobble together a solution out of more Lego. As for the lighting, it turns out the GoPro has really terrible low-light capabilities, which is why I brought in a studio light towards the end. Next time I'll see about borrowing both that are available in this household and using them from the beginning." "I could have fixed these issues if I had taken apart the set and built it again HA HA HA nope. (2600 pieces)" "Camera: GoPro Hero3 White Edition Music used: "Cumulonimbus" ~ Cumulonimbus composed/produced by Steve Lowther provided by freesoundtrackmusic.com ~ Software: Adobe Premiere Pro CS6, Adobe Photoshop CS6, Adobe Media Encoder CS6"
  16. Hello Eurobricks members! Today I would like to show you my mobile crane II with a tower from 42009 set. My mobile crane is full remoted control. Specifications of mobile crane: Length: 63 cm Width:18 cm Height: 29 cm / after lifting boom 60 cm / after extension boom 81 cm Length of boom: 43 cm / after extension 67 cm Weight: 3,5 kg Power Functions: 5 x PF M motor 1 x PF XL motor 2 x PF L motor 4 x PF IR receiver 3 x PF IR remote control 2 x PF battery box Functions: Drive for 4 wheels – XL motor 2 front steering axles – M motor Outriggers – M motor Driver`s cab – M motor Rotation 360 degrees – M motor Lifting boom – L motor Extension boom – L motor Winch – M motor BS gallery Lego website [media] [/media]
  17. Hello! I made some experiments nowadays, also this string operated actuator for heavy equipments: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=534220 (this last picture is from another model, just shows the working method) The working pricniple is very simple and effective: the winch in the end of the housing (yellow) pulls out the liftarm construction (gray) with string(s). This isn't realistic, but think about TLC's actuators, they aren't also. I made it for heavy equipment, like crane booms, excavator arms, etc. For raising a big boom, pneumatic has no chance, Lego actuators also. There are two ways after that: custom actuators/custom pieces, or built actuators. I think string is "legal", it can be made also with Lego strings (but would be expensive), so it's 100% legal. The extension is 15 stud (can be a few studs more, but that would be in the "limit zone"). With longer construction it can be even 30 studs (more would cause deflection). I wanted to make it as small as possible, it's 3,8 studs wide, 3 tall. The length can be chosen freely (as long as you want - you just need longer liftarms, or more). The final version in my projects will have bley thin liftarms instead of these black ones, so it will be looking like a real cylinder from a distance. There is 4 paralell strings in this actuator, and at the beginning of the housing there is a little pulley to decrease friction ( http://www.brickshelf.com/gallery/mbmc137/Ideas-Technologies/Extrem-Cylinder/003.jpg ). Strings are very good for smart techniques, this actautor doesn't requires much additional space for motorizing, just make a gearing with a motor after the winch's axle. Of course, you can change the strength of the actuator with stronger/weaker strings. The one in the pictures can create about 100 N of pushing force. This is a bit more than a 10 kg vertical lifting. The backward movement is done by the gravity, but it's not impossible to modify it to pull back the inner part (you can add another string, like 8421's boom extension works). What do you think?