2GodBDGlory

Okay, now that I look more closely at the images, I can see that.

That is a good-looking model of one of the best attainable sports cars out there! I don't know how much space you have in the car, but if you could power it with two L motors instead of two M motors, you would gain significant power. Good work!

That's great news!

Thanks for posting this review! It might be the only one on the web at the moment, and I especially appreciate your doing this because this may not be a cheap set to open, if unopened ones become hot collectibles! Good job!

Wow! I just checked prices for those PU components on Bricklink, and they are shockingly cheap! I take back some of my former comments (on other threads) about the ridiculous prices. Perhaps someday prices will get low enough that I can try out the system!

In my opinion, the most exciting part released since I got into Technic in 2016 has been the 35188 rotary shifter, because it allows for far simpler sequential gearboxes, without making the build process unduly simpler. However, it has the downside of having fixed geometry, meaning that we cannot build certain gearbox designs. In some scenarios, I find myself wanting different geometries, but Lego will almost certainly never make a slightly different version of the same part! Have any of you ever had problems with this limitation?

I'm just wondering... Has there ever been this much activity on a topic in such a short time? It seems to me that this could be record-breaking!

I'm glad that we can at least have the instructions for this set, if nothing else. I was more likely to try to build it out of my collection that to buy it outright, so I am glad that this set design was not entirely lost.

Wow! That is impressive and complicated! I would have had no idea where to start on a project like that, but I think you did a good job!

Great work! This is a well-engineered, good-looking, and good-performing model of my all-time favorite vehicle!

Also, given the hills the car is climbing in the video, it probably has more torque than is necessary for driving on flat ground.

Wow! The gearbox is impressive, and although it is probably too impractical for realistic model cars, it is fun to see it in this form!

Looks great! Cool to see a Technic wagon! I have never seen one at large scale before, and I like the result!

That description is both funny and concise!

Perhaps it had something to do with the fact that I was running nine motors off of it at once--A Servo, four Ls, and four XLs!

I just bought two of those Chinese buggy motors for $20 CAD, including shipping, and so far they are impressive. I think they have performance similar to the original Lego ones, but for a tenth or so of the price! Yes, they may be worse quality than the Lego ones were originally, but I feel fairly confident that they are better than 15-year old, used Lego ones, at any rate. One thing I tried to unlock more performance was buying a near-hobby grade electronics system. The whole setup (Remote, circuitboard, battery ,motor, and servo) cost me about $50, and has great power, but it is difficult to hook up to Lego, and even when you do, it is almost impossible to make a high-performance car, for the simple reason that the RPMs on the output axle are so high that a load will twist the axle in half. Not pretty.

Do you think the higher voltage would eventually cause problems in the circuitry? I once hooked up a hobby 9.6V cell to a PF receiver, and the receiver didn't last long. Lego motors are supposed to take up to 12V (I have heard), but I don't know about control systems. If the PU hub can take it, though, that could be a very interesting high-performance solution! Good ingenuity!

Great looking model!

I got a 42069 in a damaged box for $115 CAD--the original CAD price was $240, by the way.

Wonderful job! The appearance is remarkable, and the functions are impressive, too! I especially like the motorized windows. I had wondered if it was possible, but thought it would be too difficult. Good job proving that wrong!

I can't say whether or not it is possible for this gearbox to slip entirely, but I once built Nico71's similar CVT transmission and tested it in a 4x4. I found that in extremely difficult terrain it could slip, but it sure took a lot to get it to that point. Still, though, I am not sure how that happened. It looks like an interesting and original gearbox!

I have found with many of my motors that the insulation on the wires at the points where they enter either the motor or the plug can wear down, causing servos to malfunction, and normal motors to stop operating. If this is the problem, trying different wire positions, and pressing the wire into the motor will likely make a difference. When this happens to me, I will open up the motor, remove the wire, cut out the bad portion of the wire, and re-solder it. However, when I try this on servos, I usually fail because of the four leads in a small space on the circuit board; perhaps a more skilled solderer would have better luck. Of course, you may have a completely different problem...

I saw some YouTube video once that suggested opening up the motor and cleaning off the semicircular contacts with a pencil eraser (and then blowing off the eraser dust). I have not tried this personally, but you could give it a shot!

The first suggestion could be worth trying, but I am unsure abho The first suggestion could be worth trying, but as for the second one, I actually started out with that part (albeit with normal tiles on top), but I found the diameter too small to get enough ratio spread, and it seemed less controllable. I am now starting to think about testing this gearbox in a large car model, so any help I can get will be appreciated! I will test with textured bricks soon. My design is a similar one to that bike setup, but mine adds friction to obtain a continuosly variable ratio spread, while the other design appears to have a number of fixed speeds. It is a similar principle though, and one that is interesting to see used practically. Thanks for the feedback! Cool to see the history of that design, as I had no idea it had been used before. I guess no ideas that simple are original these days!

I agree, the ratio spread over the tire is a bit of a problem, but I could not achieve enough friction with the other tires I tried, and there is at least more surface area with this tire, hence more grip. I suppose its width also contributes to the rubber streaks that showed up on the disc. Another possible explanation for the slippage there is simply that there is more torque available to put towards slipping in that gear.