Having a solid rear axle causes the wheels to spin at the same rate, so you need the inside rear wheel to lift off the ground which enables the kart able to go around corners.
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This is achieved by angling the steering arms toward the center of the rear axle this will cover in step 12 Wheel Jacking Wheel Jacking or Weight Jacking is related to the caster and the kingpin inclination, which controls the ability to turn and lift the inside back wheel off the ground according to which way you turn. The Kingpins on a kart should be laid back at the top 12-15 degrees Toe out on turns When the vehicle negotiates a curve, the inner wheel turns more sharply and while the wheels remain in this position, the wheels will toe out, and will return to the correct toe in when the the steering wheel is returned to the straight ahead position. Caster is positive if the line is angled forward, and negative if backward. It’s defined as the angle created by the steering's pivot point from the front to back of the vehicle. Positive caster obviously places the front wheel ahead of its pivot point and most vehicles are designed with positive caster angle. Caster Positive caster angle is best illustrated by the rearward tilt of the steering fork on a bicycle. in the middle of both positive and negative. If the wheel leans in towards the chassis, it has negative camber if it leans away from the car, it has positive camber. Camber Camber is the angle of the wheel relative to vertical, as viewed from the front or the rear of the car. It’s less safe than understeer, because it can be the prelude to a spin, and suddenly lifting off the power (which is a natural reaction) can actually cause the spin as they tires “bite.” Cars like the Porsche 911, where the weight is all behind the back axle are prone to this. Rear wheel drive cars are much more prone to this. It’s inherently quite safe, as the speed is scrubbed off, and as long as there’s enough road, the tires will eventually grip and turn the car the way you want! Oversteer This happens when the back end of the car slides away from the direction of the turn. Most modern cars are front wheel drive and they tend to understeer. You can feel the tires scrubbing against the tarmac.
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Understeer happens when the front of a car tends to go straight on when you turn the wheel into a corner. Unlike a car the rear wheels do not have a differential but are locked together and always spin at the same speed, this requires some cleaver engineering to make the inside rear wheel lift of the ground when turning and allowing the front of the kart to turn in. If you don't get it right you Kart will not turn but plough straight ahead. Getting the steering geometry correct on your Kart is one of the most important consideration when designing the frame. Engine (We are using a mower engine which you can off an old mower or look on eBay for a few dollars).Seat (You can use any seat you can find but we are using a fiberglass seat.Steering Wheel (You can get a cheap second hand wheel for about $20 on eBay).4 Tires (You can find these on eBay, a new set can cost up to and over $300, but if you get a used set they can cost less than $100 or free).A used set can cost you up to and over $100 on eBay) 4 Wheels (These can be quite expensive, new and second hand.Mechanical Brake Caliper With Brake Pads & Cable.Axel (You can find these second hand on eBay for about $50 or new for $150 - $200).I recently bought a number of parts from cut price racing, they have almost everything you will need and their service was excellent.lots of 6mm and 8mm nuts and bolts Parts you will need: (Screen shot are includes as the ebay links can go dead) Materials you will need: 25 or 30mm Square Steel Aluminum Sheet 1.6mm thick 19mm and 25mm Steel Tubing 25mm solid 30mm bright solid (If you want to make your rear axle) 13mm tube or pipe.
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The first thing you need to do is to gather all the parts, as it makes it much easier to design if you can lay out all the parts where they will be on the kart and kind of "join the dots".