JoKo

That's flattering! If you can send me pictures or video of that I would be delighted!

Thank you! The trailer is not yet digitalized. But if you post a few pictures and a nice comment on rebrickable I might get the motivation...

Thank you! I appreciate! Thanks! Yeah, i almost forgot about the deadline and rushed the entry. I wish I did it better .

The idea is to avoid strategic abstention I guess.

Tracked Penny Farthing Functions: RC steering and drive with PF animated steering levers Animated gentleman: legs, arms and head Trailer with animated lady, cat and butterfly Video: Topic: Free instructions: https://rebrickable.com/mocs/MOC-226135/Joko Technic Design/tracked-penny-farthing/#details

Thanks, Even a scaled propeller would be quite huge! Thank you! It can even reach 1200 rpm with two motors and new batteries! Without falling apppart and the valves are keeping up with the pace

Photos are showing OK for me. maybe it was a temporary issue with onedrive? That's what "won't load right now" sounds like to me

There is a big fake engine I designed lately. Inspired by air-cooled airplane engines Radial 6 cylinders Over-head valves with pushrods and rockers 12 valves / 12 camshaft "Accurate" valves timing Crankshaft with counterweight Displacement: 43cm^3 / 84 stud^3 Bore & Stroke: 24 x 16mm / 3 x 2 studs 1140 pieces Good points: I'm happy with the valve timing system. I like the "snowflake" shaped gear train. The pushrods and rockers are nice to see working. One single rubber band around the timing module takes care of the valve spring job for the 12 valves altogether. The counterweight really helps reducing vibration and a small PF motor can run the engine up to 500 rpm. Bad points: The 6 cylinder design was dictated by Lego pieces however IRL an odd number of cylinders is the obvious choice for a single row engine. Because of the 4 stroke cycle an odd number of cylinders allows an ever firing order. And my 6 cylinder can not have an even firing order... I's no big deal because there is no actual fire and it is not visible when running "fast". But it is noticeable when it runs slow and upset my perfectionism... Instructions: I made building instructions with detailed steps to set the valve timing correctly. Before I publish instructions I'd like to have someone test it. So let me know if you're interested! Videos:

Sorry for late answer. No the panel is a black Lego piece with a rectangle of carbon fiber laminated on the outside. (90gsm 1K like the first link shared bs @allanp but not stabilized). I'm happy with the pattern alinement on the piece but I sanded a bit too much which made the pattern distortion near the edges and especially near the left corner. About the weight of carbon fiber I'd like to point a common misconception: CFRP is not that light as a material. If you replicate a Lego piece out of carbon fiber it will be 50% heavier. So if your goal is just weight saving and look you could make the wheel 90% 3D printed and laminate the flange with carbon fiber. It would be much easier to have a clean carbon pattern. I guess it's not what you want for your youtube vidéo as it would not be legit "carbon fiber Lego wheels". About loosing fingers in laborious sanding: Every hour spent to make the mold as smooth as possible is saved on the finishing of every piece getting out of this mold. And of course it will make demolding every piece more easy and less hazardous for the mold.

Not bad for a first time with carbon fiber. Especially on that scale! That's my job since 2010 so, yeah, I know how hard it can be sometimes. Destroying 3D printed tooling is a pretty common last solution, don't be ashamed! The process you used is called "wet layup", Prepreg is a different technology not really adapted to DIY. Seeing the video I would have a few advice for the next version. DM if you're interested! (I speek french btw) Edit: there is a panel I laminated with a thin carbon layer (100g/m^2)

great idea! a hand or foot pump on the public side will make your display interactive

Yeah ! that's it! My model is still Penny -farthing but there is a cat and a butterfly on the trailer... Thanks!

I have one like that and it could suit you need if it wasn't so loud! I think you can exclude any workshop compressor from your choices. Some compressor for airbrush seem to be much quieter and may provide the air flow you need for hours: https://youtu.be/MDIuEDJAWZI?si=y1LM1fOfsKScXD9u Hope it helps!

I also realized I may have misinterpreted a rule: No animal allowed. I assumed it meant "please don't make an animal on a tracked base". But if it meant "no animal at all" I'll have to change a few things

That's the trailer I was working on. The base contains a "drivetrain" with functions driven by the left track and and by a subtractor differential on the right side. The trailer is modular. It is currently set for passenger and luggage transport. ( Sunday ride to the market) But it gives the possibility to use the same base for an unlikely useful agricultural machinery Functions: Lady's head is driven by the subtractor. A bit similar to the gentleman's head but with different result. Thanks to the vehicle, trailer and hitch geometry when the driver turns left the lady looks right at first and looks left in a second time. The cat's tail is animated. Driven by left track via a small crank, a conrod, a rack and finally a last gear. The butterfly flys around by the flowers, driven by left track. The trailer's drivetrain:

I laughed at myself when I realized that I argued "tracked trailer makes no sense" while the trailer is pulled by a tracked penny-farthing... (so realistic!) So I stopped being lazy about it and found a way to make it work with tracks, that's what this contest is about after all! I'm eager to show you the result.

What if we say: The entry model has no wheeled trailer. Accessories like a wheeled trailer can be used in the video. Does it seem fair to you guys?

@Jim One late question about the rules: Can a tracked vehicle have a wheeled trailer? I mean a tracked trailer does not makes much sens IRL I guess. And traction on hard floor is not enough to power some mechanism on the trailer. Would this violate the no-halftrack rule?

@Timewhatistime Yeah! I discovered everything about this weird forgotten vehicle just after TC29 started... What are the odds?

Thanks! Now that I am happy with the vehicle and instructions are done, I built some accessories. I made a luggage rack and chest. the chest can contains small items. I also built an old camera and a "telescopic" tripod that can be tied down on the chest. This improves the vehicle practicality and adds a bit of storytelling!

Thanks! Yeah, this fake steering with the head motion was a fun challenge! He is the inventor. He's a french eccentric dandy! I found this old video in dusty 1920 archives: Instructions in progress! It has 903 pieces, 115 of them are track links.

Thank you guys! There is some progress: New rear frame, properly cross braced solved the cracking noises ( it was bevel gears being pushed appart and skipping teeth) Driver went from stick figure prototype to dressed to the nines gentleman. (new head was too heavy, had to use a counterweight inside the torso) Tidy up and fix small reliability issues Details : headlight, dashboard The driver may remind you of the one driving my Fiat S76 MOC. They have similar heads and identical hat, moustache and bow tie. Some details may change but it is close to be done and I'm happy with how it looks and how it works.

Yes... you read it well! I had this wild idea while brainstorming about an unexpected vehicle converted to tracks. This is my first working prototype. It still makes cracking noise and other small issues but the functions are there: PF remote control, 2 L-motors, 1 receiver, battery box Penny-farthing central track driven by differential and bicycle pedals Fake steering controls Driver with articulated legs and arms 2-axis head moving system actuated by the shoulders. Sorry for the quick & dirty pictures

So cute!

Hi! This is a simple little 42205 Corvette alternate build. It is meant to look like F1 cars in the 1970's, with rear axle wider than the front, simple wings, and big air scoop. Features: V8 fake engine RWD with differential HOG steering Free building instructions: https://rebrickable.com/mocs/MOC-221015/Joko Technic Design/classic-f1-race-car/#details I built it in real life but have a problem with my phone currently so no photo for now... The new parts from 42205 are not yet in Studio. I tinkered something in PartDesigner. That's far from beautiful but clear enough for instructions. There is one unorthodox solution because of B-model limitation: the steering axle is connected to HOG with this system: (good enough for the torque needed)