Lipko

Unfortunately Lego is not consistent with their bar policy. Some parts accept bars, but the updated part doesn't any more. It's very annoying when one wants to make instructions. For example this part has also a version that accepts a bar, and a version that doesn't

Yeah, so much for "degree in engineering". I planned four medium cylinders for the LPE, because everybody knows: bigger is betterer. 4 cylinders instead of 2 will have two times the torque. I knew that it won't have any other advantage, it won't run smoother, as I still use two pneumatic swithces. To save space and because I'm so smart. I also knew that 4 cylinders instead of 2 will mean roughly half rpm, considering the pumping action is the same. And this is the key: twice the torque and half the rpm. But the power is the same, it's totally pointless to have 4 cylinders because the output power will be the same, I just don't have to gear it up so much for the transmission. 2 cylinders means significantly less space, no piping mayhem, no enourmous torque on the output shaft of the LPE. Maybe the reason I chose four cylinders was to have more hand pumps, but I want to stop at two pumps for the engine. Having than many pumps is very expensive, would require a very bulky pump mechanism so not something a kid can hold in hands. And most importantly the pipe diameter would be the bottleneck, and I think adding more pumps would do absolutely nothing unless I double the amount of pipes and pneumatic switches, which would be pretty much impossible to cram into the model withour looking like some gross spagetti monster. Rant over. Other: maybe it wasn't clear, but the suspension will lift the model, so it will look like a monster truck. The pictures show the model sitting.

And I guess you'd put a compressor inside the car too... or a handpump?

Hi all! This is my entry for the contest, a fully pneumatic rock rat. Not strictly a monster truck, but rather a crawler. You can disqualify it if it deosn't fit the requirements. Sorry for the sloppy writing, I don't have too much time nowadays. Concept: To make an all terrain vehicle that would be operated/played with by mainly kids on exhibitions without the need of continuous supervision. This requires a sturdy model that's labor intensive to play with to encourage only brief play, so standard remote controller models woudln't fit. The next obvious solution is to have a pneumatic model with tethered control. The model is an exciting one for me, as it fulfils several personal goals at once: -to have a hand pump powered pneumatic engine for exhibitions -to build my first ever crawler -to have another vehicle to display on exhibitions (to have more models to rotate) -to ressurect my solid axle rat rod, but as a manual model. Or build something similar -Willy's jeep as rat rod was always my favorite rat rod type, but it's already done and done well (I couldn't find it at the moment) -my holy grail/nemesis: adjustable suspension The model will be a pneumatic engine driven, pneumatic steered, pneumatically suspended rock crawler based on Willy's jeep. It is not a high performance, high capable crawler. Simplicity is the main design principle as I don't have too much time for MOCing unfortunately. The design is planned to be a rat rod-ish, maybe a steampunk post-apolaciptic vehicle. My main inspiration is this: https://www.designboom.com/technology/jeep-rock-rat-haut-designs-01-26-2016/ Details The LPE engine has very low rpm but high torque, so the output will be geared up as much as can be done effectively. Four medium cylinders, one set in 90 degree phase in relation to the other set. This means an engine with no dead point and noo need for a flywheel. This is a common, obvious setup, I didn't invent anything about it. Since the motor only rotates in one direction, there is a forward/backward clutch, actuated pneumatically. It will be operated with the throtlle lever, and the engine will always operate then there is pressure in the system. The clutch will disengage the drive after a while if presure is not applied. This is to ensure that the model does't break when pushed. It is achived by simply leaking the two pipes that goes to the cylinder that's operating the clutch. Maybe I will put additional safety clutches to the half axles, I have to test that. Adjustable suspension, solids axles, four links. A very simple one, that uses only one circuit for the four wheels, so it only works when fully pressurized. Otherwise the chassis tilts and rolls. It will use long thin pneumatic cylinders. I estimated the load capacity, and should be strong enough to hold the model. I will apply limit straps, in order to protect the cyinders when the model is grabbed by hand. Four wheel steering, actuated by pnematics on both axles. The axles are mechanically coupled (gear-rack). Independent steering would be awesome, but it would be too complicated to solve proper centering (would require two cylinders per axle to make a three stage positioning, and much more complicated control). The hand pump are part of the controller device, but can be detached (so one person pumps, the other controls). Progress so far: -The engine prototype is done, and tested with a rolling chassis. Slow, but very strong even without proper bracing and optimisations. The weakest part is the drivetrain, the engine is so strong that it can twist an axle. Lubrication is not applied yet. -sketches of the whole model in Stud.io. Basic proportions, axle prototypes are made. https://f005.backblazeb2.com/file/Brickshelf/bs01/gallery/szecs/monster-rat/wip/WIP_01.jpg https://f005.backblazeb2.com/file/Brickshelf/bs01/gallery/szecs/monster-rat/wip/WIP_02.jpg https://f005.backblazeb2.com/file/Brickshelf/bs01/gallery/szecs/monster-rat/wip/WIP_03.jpg

Try my instructions. They are free. https://lipkovicsdesign.blogspot.com/p/build-instr.html

Nice progress so far! I'm not worried about the number of WIPs so far, it's holiday season, and maybe many builders are still in prototype phase. I was busy prototyping, and so far the concept seems to be feasible, I will make a WIP thread if I have time.

How moes does the model weigh? Does it really need that many cylinders?

It has steering.

Your scaling loks off. If you scale the red silhouette with scale center as the rear wheel center, the proportions would match pretty well. Maybe the wheels are a tad too small, and you based your scaling on that?

I already commented on Facebook about this. And obviously I only look at pictures (by the way, I can always tell if I see a Nico creation. The style, building quality and photo quality), so I dind't recognise this was an alternate build. So awesomeness increased.

Sorry, a rookie question from a person who is functionally blind and haven't participated in contests in ages: Is a WIP thread mandandory? Or is it okay to drop the nuke in the last minute?

Hideous is a bit strong but awkward, yes. I think the angle mudguard is a bigger problem than the angle of the fork. May be an easy fix, though I don't like the idea that I need to fix a set. Not one bit.

Howaboutism. And not even relevant. Have we ever heard directly from alternative brands that some function in an official set doesn't work reliably? Facts are facts. And they won't change just because things can forgiven in case of smaller prizes. Don't get me wrong, I'm not a blind Lego fanboy, I haven't built a technic set since maybe 10 years, because I do think they are too expensive and have too many flaws.

Okay, but reviews and other opinion sharing posts never contain a disclaimer that "when we say perfect in case of MOCs and alternative brands we mean sort of work because hey, they are cheap. And we will say everything sucks in case of Lego because hey, they are expensive. The comparison may be fair considering the prices, but skewing information is not.

Another problem (at least my problem) is that the level of effort is much higher than the money a usual MOCer (not top tier MOCer) can hope for. If it's not for the money, then I just make it free. If someone else makes the instructions of your model, that's a different case.

I have a manual, it's still common in Hungary. It's no such of a blast... Especially in traffic jams

Perfect.

I don't think the opening things are hard coupled. It's more likely that they operate with springs, so a tiny push on some button starts the movement. So opening the hood pushes all the other buttons, but the force is taken from the loaded springs. And this means the things can be opened separately too. But I'm just guessing. Obviously posted before finishing the video It looks like a pretty solib build so far.

Nowadays a few minutes here. Some months ago it was about 5 hours per week. Though it was not Technic but system, realistic space theme MOCing.

Yes, in this forum one should only bash Lego and praise other brands!

Color vomit is part of studless Lego Technic's aesthetic language. At least for me, it was always a given and it was one main thing that re-sparked my interest in Technic. As a mechanical engineer, most Technic machines cannot impress me. Also, perhaps, as a hobby programmer (and also as an engineer sometimed doing electronics), I am used to color coding (parts, syntax highlight), so it's really something that feels so natural. Sorry for the off.

I have a very limited ramge of music I like. Some metal, some jazz-fusion, some psychelic progressive whaterer. Voivod, Soft Machine, King Crimson, Dead Can Dance, early Pink Floyd, casual Metallica/Slayer/Primus. shoegaze, but only Cocteau Twins, some Terje Rypdal. A very few albums from Miles Davis and Frank Zappa. Wide range but only a very few bands from each gerne.

Does it depend on speed? Clickless one-way clutches often rely on centifugal force to brake.

I would accept print for a light if it's in that style on the car too. Hard to express it properly. But on the real car, the front light are definitely has bulk.