Didumos69

[TC12] Fire ant - Tilting go-cart - New video added

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Fire ant - Tilting go-cart
 
Features:
  • 4-wheel steering
  • Straight line stability
  • Rear wheel drive
  • Working fake V4
  • Everything in-system
  • Toddler-proof
Wacky feature:
  • Cabin tilts in turns, which compensates for the centrifugal force the driver is exposed to.
I know most TC12 entries interpret the wacky function as something to hinder opponents or simply disturb them with something wacky. I opt for something 'out of the ordinary' to gain advantage on my opponents instead.
 
I had this idea laying around for a while and seeing 'The (amazing) Unrollable'-entry by @kodlovag triggered me to give it a try for the TC12 contest.
 
The idea boils down to a cabin that is connected to the front and rear axles with turn tables. The turn tables are inclined, which results in the following effect: a tilting cabin makes the front and rear axles steer. The front axles are inclined more than the rear axles to make sure the rear axles don't steer as sharp as the front axles. The driver makes the cabin tilt using the steering wheel. By keeping the center of gravity of the cabin lower than the turn table rotation centers, gravity will give the car straight line stability. This is why the seat sits very deep.
 
So far I only have an LDD-file, but I did test some constructions in real life. I never did something with small turn-tables before and I was amazed about their quality, they have very little slack. Nevertheless I want the cabin to be very light, so the turn tables won't be stressed much. The whole model currently consists of 303 parts. The seat is still floating, I still have to figure out how to connect it to the cabin. Maybe with rubber connectors to obtain even more comfort.
All inclined constructs rely on perfect fits derived from this Pythagorean triangle (courtesy of @Erik Leppen):
 
triangle345.png.9d9948f6e70b1aff3b8d98633f6b14f6.png
 
Feel free to comment!
 
800x450.jpg800x450.jpg800x450.jpg800x450.jpg800x450.jpg800x450.jpg
A short WIP video:
 
Edited by Didumos69

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Great idea, but somehow it doesn't really seem that wacky... But then again, you haven't finished yet...

So keep it up, and good luck!

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1 hour ago, mocbuild101 said:

Great idea, but somehow it doesn't really seem that wacky... But then again, you haven't finished yet...

So keep it up, and good luck!

Thanks! I might give it a little more 'face', but I got my go-cart inspiration from the Wacky Wheels game, so I don't think it will get much wackier :classic:.

wacky-wheels-hd-online-game-code.jpg

Btw, thanks for the hints on using POV-RAY. I'm using POV-RAY as it comes with Stud.io and there doesn't seem to be a way to feed it with your settings. But I will keep it in mind for when I start working with POV-RAY itself.

Edited by Didumos69

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2 minutes ago, Didumos69 said:

I'm using POV-RAY as it comes with Stud.io and there doesn't seem to be a way to feed it with your settings.

That's most likely because it's probably not the full version.

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Very interesting construction. Reminds me a little on Carver One.

I think, I understand the steering mechanism. Is it easy to turn the steering wheel, when the cart is standing?

And there is not a single fixed point in the whole system. I like it.

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49 minutes ago, mocbuild101 said:

That's most likely because it's probably not the full version.

You can export io file into mpd and then create pov file in LDView with custom setting, it has nothing to do with povray, it is just stud.io setting. You can export to pov file directly from stud.io and edit parameters in povray.

Regarding the buggy, remings me 8226 Mud masher: https://brickset.com/sets/8226-1/Mud-Masher  my last set before dark age, VERY playable

Edited by Ivan_M

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On 8-9-2017 at 1:59 PM, kodlovag said:

I think, I understand the steering mechanism. Is it easy to turn the steering wheel, when the cart is standing?

If you follow the tilting movement with your hand, I suppose it will be easy. Actually, I expect to be able to steer the vehicle by tilting the cabin / seat, which would add to playability imo. This image shows more detail of the steering mechanism. The steering wheel drives the turn table to which the front axles are connected. The rear axles simply follow the position of the cabin.

800x450.jpg

Btw, the angle of the steering wheel in this image corresponds exactly to the steering angle made by the axles.

800x450.jpg?a=1

On 8-9-2017 at 2:10 PM, Ivan_M said:

Regarding the buggy, remings me 8226 Mud masher: https://brickset.com/sets/8226-1/Mud-Masher  my last set before dark age, VERY playable

I didn't know that one, but it seems related indeed. Only my version has a working steering wheel.

Edited by Didumos69

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Looks really interesting.

Not to change the subject, but what is your "Flex Less" avatar supposed to mean? I am assuming that it is some type of play on Paul's "Stud Less" one?

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1 minute ago, Meatman said:

Looks really interesting.

Not to change the subject, but what is your "Flex Less" avatar supposed to mean? I am assuming that it is some type of play on Paul's "Stud Less" one?

"Always in persuit of rigid structures" aka "flex less"? :wink:

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I like the concept, it is really cool. And the frame with the triangles looks great... But what is the wacky function going to be?

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47 minutes ago, Rudivdk said:

"Always in persuit of rigid structures" aka "flex less"? :wink:

I could not have phrased it better :thumbup:. And in addition to that I tend to not use flex axles in my builds.

20 minutes ago, Leonardo da Bricki said:

Not to change the subject, but what is your "Flex Less" avatar supposed to mean? I am assuming that it is some type of play on Paul's "Stud Less" one?

And of course it's a wink at Paul's studless logo.

20 minutes ago, Leonardo da Bricki said:

But what is the wacky function going to be?

I was hoping the tilting frame would do :blush:... it will give me such a good roadholding (together with the 4-wheel steering) that I will win the race :wink:

Edited by Didumos69

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14 hours ago, Didumos69 said:

But what is the wacky function going to be?

 

14 hours ago, Didumos69 said:

I was hoping the tilting frame would do :blush:... it will give me such a good roadholding (together with the 4-wheel steering) that I will win the race :wink:

I just reread the info topic and it states: The second requirement is that it needs to have at least one wacky function besides driving and steering. This function can be anything to gain an advantage in the race. Of course it can also be function to hinder your opponent. Anything goes!

I know most TC12 entries interpret the wacky function as something to hinder opponents or simply disturb them with something wacky. I opt for something 'out of the ordinary' to gain advantage on my opponents instead. So my tilting tub is my wacky feature.

Edited by Didumos69

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I used this type of steering in the Lego Rebrick competition "Lego Technic Porsche of your dreams" .

I knew I did not make any chance to win so I made something different.

 

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11 minutes ago, MikeTwo9398 said:

I used this type of steering in the Lego Rebrick competition "Lego Technic Porsche of your dreams" .

I knew I did not make any chance to win so I made something different

And I was thinking I was doing something new :sceptic:. I didn't notice your entry back then. It doesn't have the looks, but it sure has a very nice wiggle steering feature :thumbup:!

I just shot a short proof of concept video:

 

4 hours ago, LvdH said:

My favourite so far :thumbup: 

Thanks!

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5 minutes ago, Didumos69 said:

And I was thinking I was doing something new :sceptic:. I didn't notice your entry back then. It doesn't have the looks, but it sure has a very nice wiggle steering feature :thumbup:!

I just shot a short proof of concept video:

Looks nice. The front is is rotating more than the back.

But be careful by placing a lot of weight in the middle, especially when placing the center of gravity above the axes. It will become instable and making the vehicle steer on it own.

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Just now, MikeTwo9398 said:

But be careful by placing a lot of weight in the middle, especially when placing the center of gravity above the axes. It will become instable and making the vehicle steer on it own.

Yea, I want to keep the center of gravity of the tub below the rotation points. If that fails I will make some kind of return to center, probably with silicon bands. I want to obtain straight line stability.

I'm very curious how it will feel when all can be operated using the steering wheel.

5 minutes ago, MikeTwo9398 said:

The front is is rotating more than the back.

Intentionally, but in my cart the difference will be less.

Edited by Didumos69

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Wow! I like this a lot.  I will like it more if instructions or an assembly video becomes available. Just kidding, great little car, good luck in the contest.

Andy D

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On 9-9-2017 at 6:18 PM, Andy D said:

Wow! I like this a lot.  I will like it more if instructions or an assembly video becomes available. Just kidding, great little car, good luck in the contest.

Andy D

Thanks!

I secured the seat and managed to have it sit really deep. Also did some work on form-locking several structures, which resulted in a  cage around the seat and two inclined lines running over the front axles. I did some work on the color scheme as well, but nothing is final yet.

Finally I gave this thing a name: Fire ant. It is red and it consists of three segments (just like most insects): the head, the thorax and the abdomen.

800x450.jpg?a=1800x450.jpg800x450.jpg800x450.jpg800x450.jpg?a=1800x450.jpg?a=1800x450.jpg

Edited by Didumos69

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6 hours ago, Didumos69 said:

Fire ant

The first thing I thought: You need to put some flaming exhausts on it! :devil:

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Starts to getting shape, I really like the concept! :thumbup: I am curious if You will develop it further with eyes, mandible (bionicle / hero factory / large figure parts would be useful) - too bad, that You are flexless, feelers would be great to be made of... :tongue:

Edited by agrof

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