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Here is an updated version and a sketch of the new turntable. ldr file 120 frame render A better render (of the previous version): New turntable:

Here is my attempt to reverse engineer the 9391 from the first images (before seeing the images that appeared yesterday). I think most of what I've done is correct, but there are still some missing pieces. Also, the boom doesn't seem to be able to go horizontal. The pictures of the b-model also confirm certain pieces which were impossible to see in the other images (for example the 2x3 plate at the back of the excavator is visible on the b-model). I'll post an updated version tomorrow with the ldr file.

So far my design fails . Today I tried building it into a vehicle similar to 8635, but it only worked when suspended in air. The construction bends too much when the wheels touch the ground. It is difficult to build a working model at such a small scale. Anyone who wants to give it a try can use this diagram: It is a parallelogram where two sides must be rotated in the opposite direction to the other two sides, relative to the vehicle. The blue angles have the same value.

Here: A similar modification can also be made to my other design (at the top of this page). Here is the ldr: ---------------------------------------- 0 Untitled 0 Name: steering2.ldr 0 Author: MLCad 0 Unofficial Model 0 ROTATION CENTER 0 0 0 1 "Custom" 0 ROTATION CONFIG 0 0 1 7 -40 -30 10 -1 0 0 0 0 -1 0 -1 0 48989.dat 1 7 40 -30 10 -1 0 0 0 0 -1 0 -1 0 48989.dat 1 28 60 -30 -10 -1 0 0 0 0 -1 0 -1 0 6587.dat 1 28 -60 -30 -10 1 0 0 0 0 -1 0 1 0 6587.dat 1 7 -55 -30 -10 0 0 -1 -1 0 0 0 1 0 32123a.dat 1 7 55 -30 -10 0 0 -1 -1 0 0 0 1 0 32123a.dat 1 14 0 -45 -10 0 0 -1 0 -1 0 -1 0 0 32017.dat 1 14 0 -55 -10 0 0 -1 0 -1 0 -1 0 0 32017.dat 1 14 0 -45 30 0 0 -1 0 -1 0 -1 0 0 32017.dat 1 14 0 -55 30 0 0 -1 0 -1 0 -1 0 0 32017.dat 1 14 0 -55 -50 0 0 -1 0 -1 0 -1 0 0 32017.dat 1 14 0 -45 -50 0 0 -1 0 -1 0 -1 0 0 32017.dat 1 0 0 -35 30 -1 0 0 0 1 0 0 0 -1 6632.dat 1 0 0 -25 30 -1 0 0 0 1 0 0 0 -1 6632.dat 1 14 -40 -10 -30 -1 0 0 0 1 0 0 0 -1 32523.dat 1 14 40 -10 -30 -1 0 0 0 1 0 0 0 -1 32523.dat 1 14 0 -90 -30 -1 0 0 0 1 0 0 0 -1 32523.dat 1 8 0 -70 -10 -0.980785 -0.19509 0 0 0 1 -0.19509 0.980785 0 6542.dat 1 7 0 -70 30 -1 0 0 0 0 1 0 1 0 4019.dat 1 7 0 -70 -50 -1 0 0 0 0 1 0 1 0 4019.dat 1 7 0 -50 30 0 0 1 1 0 0 0 1 0 4519.dat 1 0 0 -60 -10 0 0 1 1 0 0 0 1 0 3706.dat 1 0 0 -60 -50 0 0 1 1 0 0 0 1 0 3706.dat 1 7 40 -30 -50 0 0 1 1 0 0 0 1 0 87082.dat 1 7 -40 -30 -50 0 0 1 1 0 0 0 1 0 87082.dat 1 8 0 -30 -50 0 0 -1 0 -1 0 -1 0 0 60483.dat 1 0 -20 -40 -50 0 0 -1 1 0 0 0 -1 0 3673.dat 0 ----------------------------------------

The rotation of 11.25 degrees is required. I could do an animation showing what it would be like without it. I will upload a more compact version. My second version of this design was modified so that larger wheels could be used, so that it could fit into a vehicle like this:

Here is a working version.

The 16t gear needs to be rotated through 11.25 degrees relative to the 5L beam, which is why I used an axle pin. An easy solution would be to lock an extra 16t gear (using a 2x1x0.5 beam as you said), next to this gear, which would keep this gear rotated at 11.25 degrees.

It probably is possible to make a working model smaller than 5x5LL, but it would have to be taller. Note that this particular construction will not work if built (the blue axle pin will slip), but it can probably be modified to work with an extra 1L of height. To make a smaller version, it may be easier to turn the red and green parts from further away, using two axles, instead of trying to build two gears onto the construction.

Here is an animation: Here is the diagram: All blue angles have the same value. The blue and red line segments have the same length as the circle's diameter.

Here is my design. Each pivot axis remains in the exact centre of its wheel, but the wheels move inwards slightly as the vehicle steers. Assumption to be made: 1. The blue friction pin never slips. 2. The position of the blue friction pin is fixed relative to the vehicle, but it can freely rotate about its axis of symmetry. 3. The position of the central '3L Axle with stop' is fixed, but it can freely rotate about its axis of symmetry. The reason for using a friction pin here is that the 16t gear has to be rotated through 11.25 degrees, which is difficult to do with other parts. The wheels are both offset by 0.5L so that the axis of symmetry is central. Top: Bottom: I will upload an ldr file and draw a diagram later. Edit: Here is the ldr file: -------------------------------------------------- 0 Untitled 0 Name: steering1.ldr 0 Author: MLCad 0 Unofficial Model 0 ROTATION CENTER 0 0 0 1 "Custom" 0 ROTATION CONFIG 0 0 1 0 0 -50 30 0 0 1 0 1 0 -1 0 0 32316.dat 1 0 0 -50 -10 0 0 1 0 1 0 -1 0 0 32316.dat 1 0 0 -50 -50 0 0 1 0 1 0 -1 0 0 32316.dat 1 14 -80 -30 -10 0 0 1 0 1 0 -1 0 0 55982.dat 1 14 80 -30 -10 0 0 -1 0 1 0 1 0 0 55982.dat 1 7 -40 -30 10 -1 0 0 0 0 -1 0 -1 0 48989.dat 1 7 40 -30 10 -1 0 0 0 0 -1 0 -1 0 48989.dat 1 7 0 -70 -10 -1 0 0 0 0 -1 0 -1 0 4019.dat 1 7 0 -70 -50 -0.980785 -0.19509 0 0 0 -1 0.19509 -0.980785 0 4019.dat 1 8 0 -30 -10 -1 0 0 0 -1 0 0 0 1 33299.dat 1 28 0 -50 -10 0 -1 0 1 0 0 0 0 1 6587.dat 1 28 60 -30 -10 -1 0 0 0 0 -1 0 -1 0 6587.dat 1 28 -60 -30 -10 1 0 0 0 0 -1 0 1 0 6587.dat 1 1 0 -60 -50 0 -0.980785 -0.19509 -1 0 0 0 0.19509 -0.980785 3749.dat 1 0 40.275 -10 -29.74 -1 0 0 0 1 0 0 0 -1 32523.dat 1 0 -39.725 -10 -29.74 -1 0 0 0 1 0 0 0 -1 32523.dat 1 0 80 -30 -10 0 0 -1 0 1 0 1 0 0 30391.dat 1 0 -80 -30 -10 0 0 -1 0 1 0 1 0 0 30391.dat 1 19 40 -30 -50 0 0 -1 -1 0 0 0 1 0 32556.dat 1 19 -40 -30 -50 0 0 -1 -1 0 0 0 1 0 32556.dat 0 -------------------------------------------------- Please note that this particular design will not work if built, but it should be easy to modify.

I'm guessing this means there will be 3 instruction booklets in the box, so no B-model instructions.

The current would not be a problem. Assuming a stalled current cannot be higher at a lower voltage, the total current is limited to 1/(1/M + 1/XL), where M and XL are the stalled currents of the M and XL motors at voltage V. If V=9v and M=0.85A and XL=1.8A, the maximum current is 0.577A. This assumes a voltage drop of 9v over each motor, which is impossible, so the current will be lower. Anyway, heres another idea. Use two motors in series as a differential. Two identical motors connected in series have very similar properties to one motor driving a differential, but with double the ohmic (that is the minimum/stalled) resistance, so with half the maximum torque.

The Technic challenges are not really 'challenges' at all; there are no particular goals that a model must achieve in order to win, other than recieving votes. Each entrant just sends in a low resolution picture showing a technic model with no proof that it is theirs, or that it even works. Most of the themes are too vague and cover too many vehicles. Instead the challenge should be to build a specific machine with a limit on the number of pieces. The NXTLOG challenges are better (although still have vague criteria). Each entrant can upload pictures/videos/ldd-models/nxt-g programs, and a good description is probably required in order to win. I think they should make a Technic version of NXTLOG, or just stop the Techinc challenges completely. Yes.

I think those tyres are the ones from 8262. This is surprising, because normally there are 2 >1000 piece sets released in the 2H. I will buy this ONLY if it has full independent suspension, otherwise it is just another 8262/8296/8048.

I believe the 8110 tyres will be the same size as 54120. I have built a model based entirely on 32003, but with 54120's diameter:

Here are two more boxes:

It looks like the animators skimped on the gear animations again. First we see the left-door engaged by the gear lever. The camera then shows a close up of the right-door and engine-hood gear trains moving. Neither of these gear trains should be moving because it is the LEFT-DOOR that is engaged. Next the right-door is shown opening, then the right-door is quickly engaged and the left-door opens. Clearly the gear lever was just moved in the wrong direction. Taking this mistake into account, there are still two unrelated mistakes: The first gear in the right-door gear train is visibly stationary but the gear touching it is moving. The first gear in the engine-hood gear train is moving, but its driving ring is visibly disengaged. I guess this explains why they flash through the functions in 10 seconds.

Basically the colors in this video are slightly distorted.

The price shown here is the same as the price of 8069. A large motorcycle would fit this price. Since over the last 4 years there has been a >1000 pcs set that is not the flagship (8053, 8265, 8295, 8274), I think 8081 should fit in this category. I would vote for a vehicle similar to 8465, but bigger, depending on the price. This is the only Technic set I know of that has 'extreme' in its name. Ideally it would be scaled up with power puller wheels but with a minimal chassis so that it has ~900 pcs.

Here is the animation. I finished it a week ago but only uploaded it today. I saved the frames to separate .pngs and then converted them to a video using gimp. For some reason this messed up the colors and the first upload had a 'black crush' (although this didn't happen when I opened it in VLC ). I fixed this by reducing the contrast on each image using imagemagick but now lbg and dbg look too similar.

You may be able to send it back to Lego, but if you can't... If the motor core itself is broken, just replace it. There are many different motors exactly this size and shape, some probably more powerful than the one in the M-motor. I once replaced the motor with one from a 4.5v RC car, so I could use the PF M with the RC car's circuit board. Open the M motor to find out what the problem is (the motor core or the connections). If the core is not broken, reconnect it. If it is broken but you don't want to replace it with a different one, at least keep the gearbox and housing as spare parts for repairing broken motors in the future or for making customized PF motors. (the link is to a PF XL which spins at 6x the normal speed).

I'm doing an animation of BlueShinyApple's construction. Here is 1 frame: And here is the ldraw file if anyone wants it: ldraw file Next I will try to animate the 4-axle version.

The turntable can rotate. The 3 functions do not have to be coaxial.

It appears I was wrong . Now I see that 7 functions are possible. I think there is a mistake though. The 36t gear should be duplicated on each side.

I had actually thought of the 'yellow' and 'green' functions before, but hadn't figured out a way of getting the 3rd function accessible by another gear. Anyway, you found a proper solution! (although using modified parts EDIT: never mind!) Here is the way I thought of getting 2 functions through without driving rings (basically the same as your yellow function): The 3rd function could have come through the left, and then returned to center with another '16t with clutch' gear higher up. But the problem is that if this is done the blue function cannot go anywhere: Because of this, I don't think it is possible to do more than 3 without using more than 1 turntable.