piterx

something like this but you really need a few wires...then it's useful if you wet them in water so they will be more tidy and remain in position once you've managed to twist them around the piston's groove...another cool thing is that the oakum doesnt have too much friction inside the cylinder yeah i think it's not gonna give too much power but that also depends on how much air gets lost during the process...the more air we can save the best it's gonna work...but anyway it's gonna be great even if it just works by itself :P the problem is that powering a lego car with a pneumatic V8 requires a compressor....it's like if to power your real car you need to attach it to a container lol this model has almost no friction at all...i just need to improve the sealing of the cylinder heads...im using the wrong piece i have another one in mind...a 2by 2 studs with a single hole in the middle would be perfect...

ok...i need 4 stupid valves moved by the axis of the pistons...any idea on how to make one :P? something like this...that you can open and close using not too much energy...there has to be a way i got also another idea...let me build this and ill show you, but it's not good because it loses lot of air

yeah i knew about those switches but they seem to require a lot of energy to be activated... i have something in mind but i dont know how to make it with legos...let me draw it maybe someone of you has an idea :)

cylnders are not hermetically sealed, but anyway lets say that when piston 3 is activated the air in the 1 gets pushed again into the tube... that's why i definetly need an idea on how to direct air flood... it's quite tricky :P but i tested it by blowing some air in every cylinder and it works great even because you need just a few amount of air and pressure :P my main idea was to make a vehicle with a pressurized air tank (it could be enough even the gas to reload lighters that's pressurized) and an air engine with low consumes :) but it's gonna be enough even if it just works blowing in it lol

hi guys! im trying to develop a new air powered engine that wastes less air than usual ones and that is way much smaller... i was looking at the ceilings when it came in my mind that usual lego pistons could work perfectly...the problem was the air that kept wasting through the cylinder...when i noticed that pistons have grooves for straps.... after a few tries i've found the perfect solution: plumber oakum :) (easy to find, removable and easy to apply) so i came up with a nice diameter that doesnt allow air to get wasted but doesnt give too much friction at the same time. and here's the final version of the cylinders ...nothing more nothing less than the usual lego V set...i just need to seal better the cylinder heads to avoid air losses... now i need to invent something better than the air switch...something that makes the air get into the cylinders in that order you see in the pic... the nice thing is that with this concept the engine is gonna work like the real one, an "explosion" of air will pull down the pistons one by one, and in that order they will make the axis turn...and i think it's not gonna require too much pressure to run fast... any ideas on how air should go in that way?

O.O

yeah it was supposed to be similar to the one of this movie :P

:P i've just finished this buggy and im really happy about it, mainly because i reached less than 500g of weight...475g to be precise it has a nice gear ratio, i dont know exactly how it is, but it has the 20pin gear on the 12pin one two times. it also features auto centering steering and led lights i put no differential to improve drift... mainly because it was disassembling itself everytime for the high gear ratio lol tomorrow ill make a video about it :P cant wait for the sun lol

really nice! is it also working?

yeah that's the guy i took inspiration from! the 8t gear is useful to make it work both forward and backwards.... the 3 rubber pieces, sometimes connect all togheter to the rim...but adding the 8t gears it would be 5 studs and work perfectly :) as your friend did :P anyway my buggy was only 500g weight, torque was never too much to mess rubber pieces up :P

there's a problem....the lack of R gear...but if you add 4 small gears before the rubber parts like the dude in the video did you will have it :P

here's the 4 studs free-wheel system...this evening ill post a video :)

lol i dont know mate...probably due to its light weight it shouldnt....but im not sure, i've never tested nothing on the sand but i will with my new project...im trying to make it weigh less than 500g anyway on the sand im sure vehicles need flat wheels and not offroad ones probably the difference is that the high ratio that it has would be more useful if there arent obstacles like pebbles or sticks :P edit: the freewheel is not my invention but i made it smaller and simpler than this dude one it has 3 rubber connectors inside the white rim that grip on it while you accelerate and make the wheels turn (i hope i described it properly lol)

hey guys! here's my little sandrail...unfortunately i had no sand to test it so i tested it on concrete XD it has free wheel system (that mean that in slopes you dont need to accelerate BUT there's no R gear) front independent suspension and return to center steering... its weight is 501g and it can go enough fast....at the moment im working on an ultralight buggy that needs to run :D hope you like it! i'll update my blog in a while... so wait half an hour if you wanna see pictures of it on P-lego (my blog)

yeah! that's what i meant :) they're awesome...i mean, it's "easy" having all the functions in a big model...having the same functins in a smaller one is tricky

yeah that size is small :P something like 56x26 wheels for offroad vehicles and those from the lamborghini set for street vehicles :P anyway something under 1kg of weight

yeah it's hard to find small models on youtube lol! did u make them? they're really nice!

i dont know the english word for it (probably the italian neither lol) but it's that gear that you can find on the rear wheel of a bycicle...it keeps the wheel free to go even if the motor is not running, so you can exploit slopes to gain speed :P it only has a problem...there's no rear gear lol...i took the idea from a guy who made it on youtube but i compressed it a lot and made it only 4 studs long...it works pretty well

yeah i use to build small models and the difficulty is make everything fit the small scale :P i just wanted to know if there's someone else that likes and builds small vehicles to exchange some tips :P at the moment i just finished this buggy http://a1.sphotos.ak.fbcdn.net/hphotos-ak-ash4/411691_3639669704306_1894359611_o.jpg it's 501g weight and has differential, clutch, return to center steering, suspensions and it goes quite fast :P in some days i'll post a video about it :)

Hey guys! i was just wondering why there aren't many small models with power functions... i mean, the biggest part of builders usually create huge and heavy models (often they're awesome) but the problem is that they're not fun to drive... i've seen videos with a 4x speed and they were still soooo slow :P id like to know what do you think about it :)

ah thanks dude :D i got it :P

what do you all exactly mean for studless guys?

cool! yeah on the one i posted you're not limited on gears ratio.. you have a 1:1 and another one that you can set the way you want :P its good both for "speed" cars and offroad cars

do you have any image? can it also host different gear ratios?

there's no need dude! there are no hidden parts except for the parts u need to attach it on a chassis :) try to build it its really simple :P