yup, everyone has been suggesting me,already stated the details about it in previous posts.

also wanna let you that, if i reduce the spindle length the wheel will touch thge chassis

Here is the steering system,at both extremes

hi!

Good that you're able to do so much progress on a hobby project in just the 2nd year! i could work on what i want only by the end of third year.

Ok now coming to your design, I have taken a look at the whole thread and taken into account the progress you have achieved till now...

1. First is your steering geometry: what are the calculations you have done to design such a steering for the vehicle. Do you know the names of each of the attributes of a steering system and what they do?

When i made my gokart, I took help from a gokart building website that gives info for those who would like to make their own kart.
Complete Racing Kart Plans in Photographic Format for Download

The important aspects of the steering is the Ackermans angle, the castor, Camber, King pin inclination, steering arm angle.
Now for my go-kart, i did not use any guidance and went ahead n made the from steering with absolutely no angles. Everything was perfectly right angled and parallel and i though that it was the best looking steering system in the world. and after the whole project, i put the engine in, and once i ran it, and tried to turn, the gokart didnt turn at all! the wheels turned but it kept going straight.
I hope i am not boring you, and i hope you understand why i'm going through this in so much detail to see that you get your steering right since i didn't have anybody to guide me and i did it the hard way.

I had 5deg of KPI, 5 deg of Camber and 22deg of castor.

Now the same value for KPI and camber will make the front wheels be parallel to the ground at zero steering position.

castor is the most important value (was atleast for me!) since gokarts have a single rear axle. When you turn right at a considerable speed, the castor lets the left wheel closer to the ground than the right making the kart put all its weight on the left wheel. but then it is turned right, so automatically, the kart turns without great effort.
The length of your stub axle cannot be that long because the longer it is, the more difficult it is for the driver to physically turn the steering system. It may all look fine during standstill, but its a different ballgame when going at 30kmph.
Your steering arm needs to for the ackerman's angle, only then will the system be perfect.
Cut recesses in the frame to accomodate the wheels. Or move out the steering system so that the stub axles are smaller. but again, they must obey the ackermans angle.

2. The frame: Dont get me wrong, but i see many weak spots in your frame. Whenever you build something, you must first try to make it the strongest possible, more than anything else. Its ok if its slow, its ok if its heavy, its ok if it takes up a lot of welding time, but its definitely not ok when it breaks during operation. So you need to re-inforce your frame especially sensitive areas like the welding of the steering unit to frame. Put cross bars like a ducati's trellis frame to increase strength.

3. Rear Swing arm: Basically your rear swing arm is too long. It does not need to be this long. Long movable parts in an automobile are by default risk factors. What would be perfect is that, use the same engine as a rear swing arm. Like how it is constructed on a scooty, and try to use a plate to allow both wheels to be bolted together. And as for the suspension for the swing arm, never construct it the way you have done. It is ok if the lower joint of the shocks is an inch away from the rear axle bolt. But not so far like in your design. I see that you have re-inforced the rear but the tubing ends even before the joint at the shocks. That one inch of square tubing between the re-inforcement of axle/engine mounting to the joint of the shocks to the swing arm. It will be seeing stress that you cannot even imagine. Use a triangle rear shock design which is easy to construct.
RD125LC swingarm | eBay
I hope the link worked, and so as you can see, have another rod welded near the axle which would then house the rear of the shocks and the top of the shocks can be fixed to the same place that you have used. So the whole system looks like a triangle. And you can do this for two shock absorbers though the link shows a mono. You can do all this provided you use the idea of the scooty engine itself as a swing arm. Otherwise you can just stick to your old idea.

I hope you use this info i have given you and I hope you dont get hurt that i have made so many suggestions. Its good that you are doing something constructive and i'm happy that you are putting it out to critisicm and getting the necessary inputs.

But how well you use these inputs will show in your final product.
All the best on your project and i will be happy to help you in a particular area or explain in more detail.

//Navin

@ haxor, stop this monstrosity please. kart is not just a cobbled up frame & bolted on engine. you seriously lack basics but it so happens when enthusiasm overtakes wisdom. Sit back, read about karts & put it on paper before you cut any iron.

Since you are building a 3 wheel kart, why not build up from a regular scooter frame? it'll be strong, compact, dynamic & innovative. This might give you some insight - Tilting Vehicles Blog: Motorized - 2 wheels front

^^ why cant you just appreciate the kid for what he is doing??? what are you expecting from college kids??? a space shuttle??? If you cannot encourage the effort, i suggest you keep your trap shut.

yeah right!!!

@haxor, there might be some drawbacks with your frame design, it might also be possible that it will turn out to be a revolutionary design, whatever it may be, i think you should go ahead with it, because this experience will matter a lot in your future, your understanding about carts will be much better than people who read about hem in books like me :P
Since this is not part of a project for some high level racing, i dont think it will be a problem if your kart is not the best...

Ah, there it goes! Think innovative, you might end up building a shuttle too !!

@jd666, i'm all appreciation for the 'effort' the 'kid' is putting in.

But not so about a engg student with enthu & resources fouling around his project build. He is not of kindergarten to expect all claps only for whatever he does. Of course he should go ahead & complete but a break sometimes to learn & correct isn't gonna hurt! Experience does matter but more of 'what to do' kind than 'what not to do' stuff.

cheers!

Glad someone replied on this thread

@navinmorpheus : thanks for replying
Well,at first I referred to the same kart-building site as you mentioned.
Will reply to every query of yours tomorrow as am too tired today,hope you dont mind

here's a raw video of the 'khatara' rolling,many mods have been done since,the steering wasnt adjusted,there wasnt even a seat.

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here is what you mean by the triangular back chassis?






Its just the perception!

This tilting mechanism stuff has been made by our seniors already!

Can I ask you one personal question?
Have you completed/continuing your education in India(Indian school/college) ?

Your comment made me smile ,I just have a friend like you who just believes in theory first,practical . . umm . .dekha jayega! kinda attitude.
He mocked me from the very beginning of this project,was supposed to do with him,but excluded him for the very reason.

You see newton got hit by an apple,before that anyone knew about gravity?

I aint an IIT'ian that I will have a sea(universe) of funds,resources,technical backup to do whatever I wanna make.

I am a normal/abnormal(whatever u say) who comes from a middle class family,studies in a normal college.

you talking about plenty of resources? Lol,are you that friend of mine? how do you know about the resources I have?

You talking about resources? I have tried to accumulate as many resources as much I could,I didnt get much resource.
No technical help from any teacher as such, they know their stuff,not about what i wanna know
I am studying mech engg,I have profs here who can tell me anything about mech engg.
I asked what should I use to make the chassis?how to make it? any pointers?
they said-whaaaat?(they know what it is,they couldnt help me out)

My family is/will shell out money for any project I will take up,but there's a limit to it.
How many family or even person for that matter will shell out even 1000 bucks for something constructive?
they can spend it on their GF's but not on anything productive!
I have tools worth over 10k atleast,how many students have that?

And about my 'khatara',I know its not perfect,i never said it,have you read the title? i wrote 'first try',I guess you know what it means.

If you provide me the resources,time,technical back-up.I can make anything,wanna bet?

You call me over-confident? hell yeah I am.

Let me tell you one thing,that friend of mine is the topper and he got 8.2
where I,roam around,'waste' my resources and time,studied for 15 days got 7.85 (I dint cheat in exam )



yes there are many drawbacks,I wanna get criticism about the kart am making,not about me.

I want to know one thing go karts have Centrifugal Clutch, where can i get one and for how much will it be available.

@jd:


balanced I guess,there's a small piece of wood between steel and brick

here's the engine

From what i know,go karts with generator engines (briggs and stratton type) those engine need centrifugal clutch,I got a engine of scooty,so I really dont know from where you can get it.You building one?

No i need it as a spare.

Glad that i bring you smile. Buddy, just suggesting *Practical theory* -adapting principles/ concepts which can be put to best use in any specific case before you go around hacking, doesn't make me as smart as you or your friend. Why is it the word 'Paper' sound 'Theory' to some?

You know of Galileo who said of heliocentric universe- how many could accept then?

It wasn't about making a Tilter per se you see the site has some good Engg references if you go thru it. Adaptations (not copy) might be useful. Good engg isn't of resources alone you see. Ah, i see a kart getting made the first time!
I've no say on your non IIT background, hard resources or poor teachers but I did say i appreciate whatever you managed to put in. also meant a proper approach would shine more than what we see now & save from repetitive elementary modifications/corrections.

Yes pls. & oh, Yes
Asking for trouble? who says GF's aren't anything productive.
Ok., then perhaps a Space shuttle please, like someone here wanting me to expect from students.
cheers

I'm too late to check this thread, but probably you could have checked out my Go-kart and asked a few questions. I would have guided you guys. I have built a v twin 250cc High speed Go kart (5 speed MT), showcased in one of the threads in xbhp too. I had also published a research - information paper on the same. Search for Hemank Dabhade on google. you will come up with a few publication results. one of them. If you need any help, lemme know. I'm based in Pune,

Cheers

Hemank