The most common I've seen is rack and pinion:
Essentially you have two parallel beams with one fixed to the car's chassis. The other bar moves horizontally which changes the direction of the wheels. Attach some gears and you can hook it up to a steering wheel.
The steering technique has been used in the Whirl N' Wheel Super Truck (5590)
set. The ...
If i remember right, the tires of the small LEGO City wheels fit perfectly on a Technic 1/2 bush which then gives you an axle hole, but note that this is very flat on the ground. I don't know if its high enough to add a very small gear and build up the connection to your motor.
This can be done without a caster wheel as well:
Start out with a three wheeled vehicle, with two wheels in the front and one smaller wheel with less traction than the front wheels in the back. All wheels need to be fixed.
One of the front wheels is attached to the motor. This might need to have some gearing to get an appropriate speed.
The other front ...
It's difficult, but not impossible. A rigid axle turning at the centre would be mechanically simpler. As my crude drawing illustrates;
I would place a 24-tooth gear over the 2x4 wheel axle. A 8-tooth gear is optional but will provide finer control over the steering. The two teeth gears can also be replaced with a pulley gear.
This technique however will not ...
There are a number of pull-back motors for system wheels. Look through the Motor, non-electric section of bricklink. There is even one rechargeable electric motor.
There was also an all-rubber tire with an axle hole in some of the old space sets, though that may have a rounder shape than you're looking for.
Ever since this question was asked I wanted to build something that would fit that scale. Here's the result:
I know this is not using only LEGO pieces but, I thought that there was no way to make the LEGO motors fit 'inside' a normal looking LEGO City vehicle. So, this is basically a homemade motorized brick made of a 2x2 brick glued to the 2x2 wheels-...
: 3787 — Car Mudguard 2 x 4 without Studs
: 4211 — Car Base 4 x 5
: 4732 — Bracket 8 x 2 x 1 1/3
In the link for each piece, you'll find actual sets containing them, from which you can find set instructions. In particular, the two mudguard ones need to be one plate apart from regular wheel sets.
Funny that you are asking because I just rebuilt my old 4x4 OffRoader (8466) with my son. it's a 4 wheels drive, V8 with a functional 5 speed gearbox (including reverse).
and in the truck (with the gearbox cover):
Looking at it in action is really good to understand the basics of a car's transmission.
Assuming that you're asking about the engine in particular, it seems to be a large number of pneumatic engines that have been coupled together in order to supply the required torque. LEGO pneumatic engines typically consist of a pneumatic cylinder driving a crankshaft. Here's a basic picture to give you an idea:
The shaft usually also controls a pneumatic ...
Most vehicles in modern city sets use wheels with ∅20×12 mm tires. Such tire can be put on 12 tooth double bevel gear or combination of narrower ∅11×8 mm wheel and 12 tooth bevel gear to connect with axle. The only problem I see with this solution is that tires are swollen a bit by gear so they are not freely turned when covered with mudguard with arch.
From a glance it doesn't look like a set as much as something someone might have randomly put together. The two blue 1x2 tiles at the front seem odd, as do the double-stacked black round tiles.
Of all the pieces used it seems the rarest would be the blue steering wheel or the blue seat. It turns out the blue seat piece is used in 'only' 67 different sets.
In WeDo 2.0 app "LEGO® Education WeDo 2.0" there is a complete project 12. Steer that is exactly about that
When it drives forward it goes in straight line, when it drives backward it then turns to one side.
There is full build instruction in the app.
I've also added distance sensor and made it fully autonomous - whenever it sees obstacle it goes back, ...
You may want to have a look at some official LEGO sets of that scal to check what LEGO has been using.
For example, 2556-1 — SHELL Promotional Set F1 Ferrari seems to be about that length and uses 49mm diameter wheels and tires.
A similar wheel can be found in more recent sets, such as 8041 — Race Truck, which may be cheaper.
You can also look in the ...
Obviously The Lego Group has not released any sets specifically designed for the constraction figures, but some sets would still be reasonably sized. I've never asked a storm trooper, but let's assume he is 6 feet tall, or 72 inches. According to Brickset's information, 75114 is "over 9 inches tall" That makes the scale for the figure about 1:8.
As far as I know, there isn't an ambulance slated for release in 2017, and there hasn't been one available since 4431 in 2012:
This set can be picked up currently for as little as $30 used on Bricklink or eBay.
I designed some WeDo 2.0 models that can drive and steer using just one motor.
This one uses a system of gears to alternately drive the left or right wheel of a differential drive robot, depending on the turning direction of the motor.
You can find the complete building and programming instructions here:
Gev already answered the question about availability. LEGO Ideas sets are produced in small quantities. Perhaps this will change in the future as LEGO Ideas is now out of beta testing and was brought in-house by LEGO. The Curiosity is not going to be back unfortunately. I just called LEGO about this a couple of days ago.
As far as the Curiosity inventory, ...
I don't recall an official statement, but one story I read said that they made a deal with the original designer to limit production to one run, but that seems almost apocryphal.
As for buying the pieces you need, I would think you'd have better luck on Bricklink.
It's possible that the PaB on S@H might have all the pieces necessary, but that seems truly ...
Assaf, please note that this is not part of LEGO's website. StackExchange doesn't sell LEGO sets. In regards to your question, you are right; the #10187 LEGO Volkswagen Beetle is no longer available directly from LEGO. It was a set that was released back in 2008.
LEGO usually keeps sets on the market for a couple of years, sometimes a bit longer if they are ...
I made a compact 6-speed, which you can find CAD and .pdf instructions in this brickshelf folder. (Maybe one was reverse, I don't quite remember...)
Please bear in mind that it wasn't intended to be motorized and might not perform well under load. However it should give you an understanding on how it can be done.
If you do not have those special gearbox ...