Marxpek
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Everything posted by Marxpek
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Owh i'm sorry i thought you meant the contacts within the 9v battery box. I wasn't aware of this and i am interested in it, however this doesn't sound like a Lego solution, you want to use a 9v block battery for weight reduction? -
this is a shunted battery box...
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that sounds like a fun thing to try! but i wonder if all connections that i will have to make within this "wheel" to fortify it, will hold with all this force. Do you happen to know the diameter of an assembled ring?
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i don't think that's fair, since it will give the car a better power to weight ratio, with the built in battery.
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[MOD][AMS1] 8258-B Crawler
Marxpek replied to JTS's topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
It is indeed a great MOD, but where is the crane it is supposed to be pulling? ;D -
The only tires i have considered using here are the motorcycle tires (cross and slicks), the claas tire and the 94.8mm balloon tire, the last one slips like a maniac so that one dropped off soon, but i have not checked different types of rubber, i'll check if i can find differences.
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The motorcycle tire is 92,4mm and the claas tire is 107mm, meaning the circumference is about 14% smaller in the slick motorcycle tire.
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In theory this is correct, but in practice i found this to be the best tire for a few reasons: - it is relatively wide helping with stability - It is more "round" than the motorcross tire, this one gives a way more bumpy ride and cross tire is too loose around its rim. - it has more traction than a slick motor tire ( i do not own 3, i will try when i get 1 extra, but the tractor tire can already loose traction on a slick surface with this amount of power) - the tractor tire sits very tight around the rim, all other tires get loose under high centrifugal forces (with 4 buggy motors even the tractor tire wants to come off the rim when spinning freely, but crossmotorcycle tires do this way worse) - any other tire is at least 6% smaller in circumference, meaning you will need more rotation of the axle, meaning more resistance as well. I have tried and tested several setups and always ended up using the tractor tires, they just give me the best result, but i challenge you to improve this, i always like healthy competition, drive people to greater heights! I would love to see these calculation, but it sounds as if these are theoretical speeds without load.
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This has proven to be very hard to find near me... but i'll keep my eyes open.
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Thanks, i was not aware that this was possible, i'll see into that. And yes it is kind of crazy, i really fear this setup can destroy one of the 2 rc-units, when i forget to turn one on, the unpowered motors will act as generators, sending current the wrong way into the rc-unit that is not on, i have no idea if this can damage it, but it sounds like a bad idea, but it can hardly accelerate on 2 motors, so that issue is only present without load i suppose..
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I want to reserve my youtube channel for complete video's, so i don't want to post clips like this there. Uploading to bricksafe is no problem just embedding them doesn't seem to work, or i'm doing something wrong. And yes 32,7 km/h surprised me as well, my aim was to go over 30 and on my 3rd run i already managed well over this. 35 km/h will be the next goal i suppose, looking at the gps data curves it looks doable..
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Hello everyone, here is another attempt of mine to improve the speed record, i have just done the first test runs and managed to get it up to 32,71 km/h, which already is an improvement to my previous record of 28,47 km/h with a single rc-unit, but there is more power left. when i find more time and a better track i hope to squeeze a bit more out of it. This thing has 2 rc-units on the same channel, all 4 motors are hard-coupled and geared up 1:2,5 on the single drive axle, spinning the trac 5000 tire at insane speeds. The test run was measured with a bryton 100e gps device and also caught on film, but sadly the car is not in the shot most of the time, i'm cycling, filming and steering the car all at once, which is kind of hard, but when i find more time i will try to push it a bit further and hope to get a better shot (or way to shoot it, if anyone has suggestions how to film i would be glad to hear, here is a picture of my current setup) UPDATE: the design is final with only a bit of weight reduction done, at the top of this original post you can find my new video of it going over 35 km/h.
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Hihi, it was a joke of course, currently making a topic for my new thingy, and i can tell you: 25 km/h is easily beaten by this ;)
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Ok i'm done, what where those rules again? ;D
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please, no restrictions in design, size or scale... it just over complicates things and inhibits creativity... i think this should be a search for the best driving car, in whatever design you like, if you can make a huge jeep design go faster than a small race-car design, unlikely, but go ahead. More restrictions brings less creativity and less entries, more classes will just make this one idea more separate contests, i do not see the need or use.
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I like the test track idea, but then it should be a predetermined track, (nearly) the same for everyone, maybe something that everyone could draw on asphalt with chalk or something. If we get to create our own track for our own built car, we can just make a track that suits the car, so it looks like it has perfect handling. Maybe a track with some rules like: -It has to have 1 hairpin turn, -it has to have 2x 90 degree turn, -it has to have 2x 45 degree turns, -a track width of 30-40 cm, just some ideas. This leaves some room to set up your own nice track, but has some restriction and similarities to the tracks others will use, that way we can compare how a car handles for example a hairpin turn.
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I think this could work if we take the size thingy out, you could say: handling is steering at speed, whoever can drive the most circles (of any size, determined by the cars turning-circle and speed) within a minute, has the best handling. Or maybe make it the most figure "8's" so the car will have to steer both ways.
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ditto
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Besides the fact there are already too much categories suggested, this will just be a contest of who buys or has the best RC components and will have nothing to with Lego speed anymore, let's save this category for when we do a flying Lego contest?
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Just something fun i'd like to share: here is something i did in april (before i was on the forum) not that this fits into this contest, it's technically not a car and filled with RC components, but at the moment i'm working on some improvements, i want to go over 30 km/h regarding all idea's and comments: it is great to see so many people fired up for this, but lets just wait for that poll, we (including myself) are over-complicating things with all of our idea's here i think.
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a waterwheel?
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sorry i fail to see the logic in this...and correct me if i'm wrong but doesn't it have around 800 rpm for the e-motor and 2000 for the trainmotor? the e-motor seems a bit pointless to me as its torques is too low, but that train motor seems as a decent option, but might be heavy compared to a L-motor (the L-motor has slightly better mechanical output power). i would say it should be allowed (but i do not see why someone would want to use it except for a very very lightweight car in the case of an e-motor) i doubt the power output can compare to any other motor however you gear it.
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i guess it is not since it predates 2005.
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very true, this should be clear first, before anything else. But i think handling was mentioned as one of the main goals previously, so that would need a curvy track yes..
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any big town has this i think, but in my town a few months ago i asked if i could use it for some runs with a Technic vehicle, they declined this sadly and i do not want to do it secretly.. and another problem with this track is: it is bumpy, i think artificial grass is a more even underground and that is not great either (hockeyfields are mostly artificial and most likely closer to most people then a outdoor track and the field is divided in 4 sections of 23? meters)