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I've added a small bonus video to the first post.

Thanks for the comments everyone! At least it's allowed by Lego Digital Designer. I'm sorry, I didn't mean a gearbox, it's just a planetary reduction. Initially I wanted to make them in the same scale but I couldn't find suitable Lego tires. I tried putting the models side by side and found that it looks quite weird.

Which part do you mean?

I would like to present a 1:42 scale model of one of the largest haul trucks in the world, Caterpillar 797F. The model has the following features: Full suspension; Transmission with planetary reduction; Remotely controlled propulsion and steering, body raising and lighting; Folding ladders. The scale of the model is minifigure compatible. Bonus video: Thank you for your attention!

Thanks for the comments everyone! The coupling uses this part put on two axle pins. There's a cardan shaft running through the train. Actually decoupling also requires disconnecting the shaft. I didn't show it in the video because it was difficult for me to shoot on camera. It was only a demonstration of compatibility with standard Lego curves. I agree that the train needs large radius curves... and also a proper layout.

Indeed! Thanks for your comments, M_slug357 and ColletArrow!

What do you mean? What did I do wrong?

I would like to present a model of a modern high-speed train based on Alstom's AGV in original livery. The model features Jacobs bogies, spacious interior and automatic doors. Thank you for your attention!

Side fans are simply linked by a chain. No, replicating the real engines would take up most of the space inside the superstructure. Yes, there are more parts now, and many parts are System bricks. No, there are no instructions.

Thanks again for the comments everyone! It's hard to say, but the idea of rebuilding Terex dates back to the moment I saw the Lego Scale Modeling forum here on Eurobricks.

Thank you guys! Anything is better than yellow!

I would like to present a 1:48 scale model of one of the largest hydraulic mining excavators in the world. This machine has been previously known as Terex O&K RH400 and Bucyrus RH400, and currently it is called Caterpillar 6090 FS. However, this model uses the preceding Bucyrus livery. The model has the following remotely controlled electric functions: Propulsion; Slewing; Boom operation and opening of bucket; Rotating cooling fans; Folding ladder; Retractable service station; Lighting. The model has a remotely controlled gearbox which distributes motor power between two sets of functions. The scale of the model is minifigure compatible. Thank you for your attention!

I would like to add new items to this collection: Forbidden Love Miserable Trophies Headache

Just a crazy thought: judging from the description of the initial task, motor A can be replaced with motor B (with the same power) plus a shameless 2:1 gear reduction (which gives a speed of 2Hz). If your calculations are correct, one of two identical motors has to provide only 1.5Nm torque (3Nm after gear reduction) while the other one has to provide 3Nm torque and the same speed. That's just unfair! :)

My version: An adder is basically two inputs connected to the same output via two sets of gears. As we know, in a gear train torque is transferred inversely proportional to the angular speeds of the gears: T2/T1=W1/W2. The output speed of the adder is obviously an average of the input speeds: W=(W1+W2)/2=3 Hz. The first input transfers the following torque to the output: Ta=T1*W1/W=4*2/3=8/3 Nm. The second input transfers the following torque to the output: Tb=T2*W2/W=2*4/3=8/3 Nm. The output torque is a sum of the torques received by the output from the inputs: T=Ta+Tb=(T1*W1+T2*W2)/W=16/3 Nm=5.33 Nm. The output power is 16 W.

Thanks for your kind words everyone! That was a surprise indeed!

Portal ships are used to create instant connections with distant regions of the galaxy. Such ship can open a large quasi-stable wormhole and travel to the destination point, where it establishes a stable link with another ship in the point of origin. Since quasi-stable wormholes are dangerous, portal ships are fully automated. The ship is also capable of sublight flight in normal space. Here we can see a smaller ship appearing from subspace: Front view of the ship: Rear side of the ship with 3 groups of sublight engines: Close-up view of the portal: Close-up views of the engine pods: Larger photos can be found on flickr. Thank you for your attention!

@Zero (Zblj), thank you! It has a polygonal hinged core with attached vertical stripes.

Good observation! Actually four fingers are normal for cartoon characters, and the real issue is that there is also a big realistic palm with five fingers in the same scene. @Littleworlds, @carebear, @Legofunbuild, thank you!

Great idea! I thought about it, but after pistons I would have needed a portion of a forearm, and then an elbow, and so on. Therefore I decided to limit myself to the palm. @Aanchir, thank you for your kind words!

A general and her mecha soldier. The general:

@LEGO Train 12 Volts, @Littleworlds, @Actor Builder, @carebear, thank you for your kind words!

Nasty Tower Opposition (Awful Towers) Gloomy Towers