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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.
Fire Ant - Tilting go-cart Instructions are available on rebrickable. Entry topic can be found here. A big thank you to everybody involved in this topic ! One-minute pitch With its wacky turning feature and inclined V4 engine, this vehicle is extremely fast and highly manoeuverable. A perfect fit for a race in an urban area. Don't forget this contest is in fact a race held in LEGO City. This race-cart finds its way through the mess created by its large and heavy opponents, without giving in on speed. And like with real ants, a Fire Ant never comes alone. Their determination and willingness to serve fellow ants that stand a better chance to win, will drive other contestants even more nuts than they already are . And to make the ant analogy complete: this model consists of three segments: The head - With its steering controlled head lights pointing into each and every turn, the front section makes sure the driver won't miss a thing and allows him to anticipate unexpected situations. The thorax - The driver section, which tilts in turns, compensates for the centrifugal force the driver is exposed to. An experienced driver can make the car turn by moving his weight into the turn. The abdomen - Equipped with a V4 engine, inclined to ensure optimal lubrication under acceleration g-forces, the rear section gives the car enough power to stay ahead of all of its opponnents. Admit it, you want to ride this animal! Base features Rear wheel drive Working steering wheel Working fake V4 Adjustable rear-spoiler Wacky feature Turning mechanism which offers 4-wheel steering and makes the driver section tilt in turns. It works like this: The driver steers the front section using the steering wheel. Steering the front section makes the driver section tilt, which in turn makes the rear section counter-steer. More qualities High manoeuverability. The turning feature combines excellent road-holding with a very small turning circle. Straight line stability. The front and rear segments are stablized with silicon bands to keep the car straight. Everything in-system. All inclined constructs rely on perfect fits derived from the Pythagorean triple (3, 4, 5). Kid-proof. Each of the three segments has been build with a high level of form-locking. Nothing will fall off.