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Everything posted by Doc_Brown
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Those slicks are slick! These super swampers 1.9" fit really well too. Not sure if they have been mentioned before tho.
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- wheels 3rd party
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[TC5] Avatar Helicopter
Doc_Brown replied to Doc_Brown's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here is my first attempt. I'm still getting familiar with the actual design, so you can guess what movie I'm watching now. Still have to tidy up a bit and make the chassis stronger, still have heaps of parts left. I'm happy that I got the shape without any orange parts at all. 2 functions are tilting rotors and moveable front gun. Guess that's all there is, will see if the movie offers anything else. -
I have no idea, not sure how to even test that. I do know that after a hour of hard driving the AA batteries still have 1.74v each@!!!!
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- Off-Road Buggy
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[TC5] Avatar Helicopter
Doc_Brown replied to Doc_Brown's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
As they say great minds think alike! That's a good idea, I will look into it. thanks. I'm not too sure at all really, we shall see. HAHA, you know it would prob be about minifig scale too. -
I think this has gone a little off topic here, hehe.
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[WIP] Rally car
Doc_Brown replied to VKTechnic's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Add black wheel arches! Would make it look sweet. Great job tho! -
[WIP] Mining Excavator
Doc_Brown replied to jorgeopesi's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Looking pretty beefy. How well do those tracks work? POCOYO!!!! Awesome. hehe. -
Hi please see this thread. http://www.eurobricks.com/forum/index.php?showtopic=101270&st=0
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Madoca's new truck again?
Doc_Brown replied to terenshi's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Freaking sweet! Inspired by this? Ebay Tamiya -
[WIP] Rally car
Doc_Brown replied to VKTechnic's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
You don't have any problem running 2 M motors? I'm guessing you must be using a V1 not V2? I found L motors only worked on V2 on the same channel. -
Hello everyone! Well I was about to pull this beast apart, and was wondering if anyone would be interested in buying it as is as I just don't have the storage for the parts anymore. Parts alone are about $420 according to brickstock. So offers over $360 + postage would be a good buy. But I'm guessing only Aussies would be really interested tho. :P
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[WIP] Rally car
Doc_Brown replied to VKTechnic's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Ahh cool! How well does the M motor stand up over time? -
[WIP] Rally car
Doc_Brown replied to VKTechnic's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Thats looking really sweet! How well does that setup return to center? -
I thought this looked a little too good to be true, and just following the link shows the mistakes in the video!!! It is clear that the input motors will be affected when under load so makes it kinda pointless lol. On a side note, as this is an Australian invention and took 1000's of hours to create, its worth pointing out that that converts to approximately half a million beers. http://www.gizmag.com/d-drive-redux/15120/ What we got wrong Firstly, the D-Drive as pictured in our video is not a complete infinitely variable transmission system. At best, according to the engineering report, it is a cheap, innovative and potentially very useful primary component of an IVT. The key problem here is that the D-Drive's control shaft needs to be driven at variable speeds in order to effect the final ratio - so effectively, you need a variable drive motor attached to the D-Drive before it actually works. e3k's engineering report goes so far as to say the control shaft could foreseeably be driven through an external CVT, using a clutch - which of course introduces not one, but two friction components to the system. One of the main advantages we spoke of in our original article was that the D-Drive got around the need for friction components and transmitted all power through gear teeth. Effectively, if mated with a CVT, the D-Drive outsources the friction components to the transmission of its control engine. The next thing we failed to pick up on, but that several commenters have pointed out, is what happens when you run the D-Drive under load. With the control motor running to decide on the final gear ratio, the input motor's power would be transmitted to the wheels, where it would meet resistance under load. That load would then be passed back through the gears to the weakest point - which would be the engine driving the control shaft, if it wasn't up to the job. So it's not possible to run the control shafts using a small electric motor as we said in the video - in fact, the engineering report is quite clear on the fact that the 'control' motor needs to be just as powerful as the 'input' motor: "Our designation of 'Input' and 'Control' shafts in this report is arbitrary in that both would conventionally be used to provide power. There is no inherent character of the mechanism that requires the input to be the dominant power-providing element. The torque provided by the control shaft will typically be of the same magnitude as the torque provided by the Input shaft... the Input and Control should be considered as parallel power paths rather than as 'power ' and 'control' elements respectively." What you got right You can certainly rely on Gizmag readers to think through an issue like this one - some of the technical discussion in the comments section of the original article - as well as the discussion threads on Slashdot, Reddit and elsewhere - was fascinating. The D-Drive does indeed operate as an epicyclic gearset. It does indeed operate in a similar way to the Hybrid Synergy drive on the Toyota Prius - and this is a matter of some pride to Steve Durnin, who designed it with none of Toyota's considerable resources behind him. It does require an external CVT or some other powerful drive component for the control shaft that will not yield to the torque of the primary input motor. So where does this leave the D-Drive? More or less where the engineering report concludes. The D-Drive is an innovative component that could be used in the design and manufacture of a true IVT for use in vehicles or anywhere else a variable drive would be required. It's not a 'holy grail' and there's no rabbits coming out of hats - and what's more, it can't forseeably operate with no friction components between engine(s) and wheels, or at least something like an electric motor that can be smoothly varied in speed. The D-Drive should, and will, be evaluated on its abilities inside this scope - and as such it may well still become a very valuable piece of intellectual property for its designer.
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Shockwave Jet Engine Truck
Doc_Brown replied to SamBo's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Great truck! I'm loving those rockets To link Flickr pics, simply click the share button (arrow bottom right corner) select BB code and choose the 800x option. Copy paste that link it gives you here and your done! -
I'm not sure as I have never built 8475, but certainly has a lower center of gravity! haha. Thank you very much!
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- Off-Road Buggy
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