TechnicSummse
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Everything posted by TechnicSummse
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Yep, its a pullback-racer-ramp... and it is not as light as i thaugt :D It weights 9g, and you need some construction underneath it, to get it to the right angle, and hold it on place. When i tried it the last time, it added like ~25g in total to my model. But i like its size... its as wide as the rc- unit, and its length is nice, to cover a pretty big area of the car. -
Back from testing... with really really sad results :( i kind of killed my RC-unit... the battery-cover is broken, and the only way i could drive in the future, is taping the batteries to the RC-unit :/ The only good thing is... it seemed to be verry fast... i saw a 17,xxkph on the speed computer (wich is ~39 kph because i attached it directly to the motor-output, which is geared up 2,25 to the wheel), but after the crash... not sure if there was a free spinng wheel while the crash... so i have to do some runs again... but not today... i'm just damn frustrated now:( Here a few pictures... This.... damn thing... led to this....
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Nice design idea :D I had a rear steering once... worked fine up to ~15 kph any faster speed resulted in heavy oversteering, causing crashes. But i used tiny wheels on this model... maybe yours works better with the big wheel. I like the inverted shovel :D When i tried some aerodynamics, i used this: I wanted to try this on one of my newer versions again, and see if aerodynamics help or not :)
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Thank you :) Yes... maybe. I thaught the same... maybe i gonna build it 2 studs smaller soon. But for now, i will test it like it is... and see, how stable it runs. Would be nice to see some news again ;) Same here... it was raining the whole day.. but now the sun is shining, streets are close to dry... i can start soon :D I will do this if i build it 2 studs smaller. At the moment it seems to be pretty stable.
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I was redesigning evrything to a completely new model again in the last few days. It took me about ~10h of building time to finish this. What's new? - Until now, a not testet new gearing -> 2,25:1 (36:16) at the high output (this is the closest possible ratio (2,3333 would be perfect), wich should arithmeticaly lead to the same motor-rpm(1000) at 40 kph, then it was at my 34,8 kph record racer) - just 2 half-beam bearings at the rear-axle - kind of (adjustable) suspension (can be adjusted to be softer or harder, by adding or removing pins between the beams / hardest setting in the video) - extra flat design - center of gravity right before the rear axle - weight: 1042g (without speed computer... will be ~1065 with it) I will do some testruns later this day. Here a few pictures and a video of the "suspension"
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Trial trucks need grip at ALL wheels, ALLWAYS... If there is a differential, and you loose contact to ground with just 1 wheel, or slip in mud, you are just stuck. All the motorpower will go to the liftet/slipping wheel, and nothing is left for those wheels wich could bring you out of this situation again. No differential means all wheels rotate at the same speed, at any time, no matter if they have grip or not. In real life trial trucks use lockable differentials, to get out of those situations. But on loose terrain, you dont need a differential at all... the surface is slippery enough to give the required balance between the wheels.
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Well.. at the moment it seems this would be my prefered set... but there are no power functions included :(
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Thanks for the review @Sariel:) To the model...: I like the look, and the big wheels... the functions (outriggers, crane) seem to be ok. But the price... I just got some money to buy new Lego-stuff... and i was also thinking about maybe buying this set... but sorry TLG!!!! ... im not crazy. This set would be ok for 120-150€ i would say ...and if it would be in this price-range, im sure my money would go to this. But now, i think i will buy a 9398 and attach my claas xerion-wheels to it.
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I did that ;) nope... it still blows of like a ballon, and you can look between rim and tire at the opposite side of the free-running "placeholder"-wheel. And again.. all test are done with just 2400 rpm... i would need 2700 for 40 kph with the motorcycle wheel, and even a lot more with the futuristic wheels
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I wasted another 7€ :( I thaught i could try some other wheels... but sadly with the absolute same results, as you can see in the video at the bottom. All those older small and relativly big wheels seem to have way to soft rubber. Any suggestion for other wheels? How soft are those? : Until now...it seems this is the one and only:
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2 wheels in the front and just 1 on the back wont bring better results. Maybe it could help, if you can make a more stable construction, or reduce the rolling-resistance like that. But 3 wheels=3 wheels... and if you use just one driven wheel, you will loose some grip. But i also thaught about this :D
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I got a few 36t gears, 2 old differentials, to have some spare ones... 4 of those super soft motorcycle wheels, and a few of @Marxpek's glued frontwheel. The glued wheel wich marxpek uses, is way to hard... this wont bring any good results... i will stay with my current frontwheel, this is way softer. What about you? I havent seen any results for a long time.. its hard to get over 33, right? :D
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Because of some new ideas... i ordered a few parts last week. Yesterday, they finally arrived. Especially i was hoping for those: I thaught, with the right gearing, they could bring some wonders... Well.. maybe they could... if the rubber wouldnt be soooo soft. If you thaught about buying them for your speed-car... dont do it!!! Here is a little video, wich shows, why you should not use those wheels at high speeds :( This is just ~2300 rpm.... to reach 40 kph with those wheels they would need to rotate with ~2700 rpm. The tire-ballooning is so heavy... after a few seconds, the tire jumps from the rim. As you can see, you can look between the tire and the rim... and see the cable :O
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20 should be possible... there is a car wich uses 4 M-Motors geared 40:8 running ~22kmh
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We talked allready a few times about gearboxes. They wont bring any benefit in topspeed... just shorten the required track. But they will add some weight and a lot of friction. Not just the gears... but especially the additional axles (axle/beam-friction). You could try this one: Some time ago, i found this on @Sariel's Website. This could be a solution, but here is verry verry much axle-beam friction. This could be reworked with some thin beams, and it would be easy to add another pair of motors here.
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Its a nice idea... but im not sure, wich general informations could be stored, and in wich way. The only things we know so far, are basic physic things... small wheels, lightweigt, flat design. We cannot list usefull general information for others, since we are learning by doing all the time, and still. What we can say is... (my opinion ;)) - a usefull gearing range could be something between 1,66666 and 3,5(from lowspeed output) (the inner gearing in the motor is 23:17 between low and high output) - usefull (driven) wheels should be as big as possible, and as small as possible at the same time - buggy-motors seem to be the only real thing so far (you need a RC-unit to have full power suply, and you need 1 RC-unit for each 2 buggy-motors) - The speed-limit using 2 motors should be something like 35kph... with 4 motors it could be ~40kp, but we didnt reach this yet :( I think there are no other or more detailled informations.... i would love to create a list with information like: topspeed = xx, weight= yy, gearing=xx But this will be different for each construciton, depending on bearings, construction-stability, air resistance, the used track, and so on... But maybe we should do it, and we will find some, until then, not seen information in this data
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Not yet... i am still w8ing for this order to arrive :( Hmm sounds like my 40:12 testing... but i think i choosed the wrong offset here, and the 12t gear was just a little bit to close to the 40t gear. 36:12 should run smoothly. What was the problem there? Simply a bad speed-result? Well i thaught about that... and thats why i created such crazy constructions like "The Machine" Im not quite sure if it makes a difference if the gear is loaded or not... it produces friction anyway. But i have the feeling, using the high-speed-output should be better. At the end it is way easier (with 4 or more motors) to use the low output. As i told allready a few days ago, its hard to get evrything fit, when using the fast output. Its just too hard, to come out of the motorcase with the gearing. This would also be the reason, why i would use the 56t turntable... Thats the biggest reason to use the low output... simple and matching design (in the 4 motor-case) yep.. its offset 1 stud... 28+8= 36 <-> 24+12= 36 -> its the same offset
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Well... as you can see, it gives some nice result... and i liked the idea, because it is something new. Maybe not the best... but it was worth a try :) To the construction... this is 5 studs wide between the motor pinholes... it fits perfectly to the RC-units pinholes in one line. Construction could not be easyer then this :D By the way.. you are right... the gears are not as solid as others... but i killed allready a few older 24 teeth gears on my testruns. so what? :D Im pretty sure, i will test a turntable at one day...but at the moment i only own one newer style turntable, so i will try some other gearings :)
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I did not use it as a differential, i used it as a gear, by blocking the 12t bevel gears in the differentials with just 1 axle going completely through the differential between 2 motors. Like that i have a 28t-gear, to provide me another gearing range, wich i usually could not use. Or is there any other 28t-gear? But the first run directly killed me a 12t bevel gear, while breaking Here the promised picture ;) There are just two 8stud axles between the 4 motors.
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100 points...you will get the cookie :D Its a 28:8 gearing. I will post some pictures tomorrow
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I also thaught about a rubber-band once... but no.. rubber-band would slip to much, and a tire would produce to much friction... It has teeth ;) If no one can find it, i will reveal the gearing tomorrow at ~13 o clock
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now you are thinking in the right direction :D But no... its not a turntable... but i also thaught about that :P
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No.... its a gearing not used by anyone of us so far... you must think outside the box :D
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Please post gears, and not just ratios ;) But you should know 1:1,8 would not lead to 37kph :D
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No, sorry