Racer- Designs

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These are some designs i have prepared for my a-level racer, and i would appreciate what anybody thoguht of these

The main body shell is made from an old roof box with its already areodynamic profile

it will include a movable rear wing sytem to increase downforce or reduce drag depending on circuit sector,

it also incorparates a 'brake-steer' system as seen on the McLaren MP4-12C

thanks for ANY veiws :) 

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Gunner Hoots's picture

Racer design

Hi Sean,

If you search this web site and its links you will find shed loads of info on steering design suspension and all the stuff you need to know to make your cart go round bends. Its all here somewhere. Also if you check out the competion entry specs they give a good indication of what works and is safe, I understand that you may not want to race your cartie and just do your own thing.

I ve only been building and racing a short time so I m not an expert but your cart layout seems to resemble a Morgan 3 wheeler or a Reliant Robin neither of which was noted for its cornering ability. I also cant get my head round your steering are you going to put in any castor or camber it needs a bit of thinking about. Anyway good luck with your build and keep posting pics.

All the best


Gunner Hoots | January 3, 2012 - 14:28
roo4's picture

Hi Sean,I like your concept

Hi Sean,

I like your concept sketches far better than I can do.

I agree with Rick you need to review the steering position, it look like you want to use a drag link system.

You may also want to think about  an extra rollbar in front of the streering.




keep ir rubber side down


roo4 | January 3, 2012 - 19:47
scottishcarties's picture

Steering geometry

Hi Sean,

I think you should have another think about your steering design. From what I can see, you've got your front wheels held in horizontally mounted forks with the king pin well behind the wheel. This will put the point where the tyre contacts the road about 30cm in front of the point where the wheel pivots for steering. There will be a huge tendency for the wheels to want to pull to one side or the other, and I suspect it would be extremely difficult to keep in a straight line.

Good steering will try to self centre and the natural reaction of the wheels should be to move back to straight ahaed when you let go of the steering wheel. Yours looks like it'll do exactly the opposite.

To fix this, you need the road to rubber contact patch to be behind your kingpin axis. I suggest you have a look at the page on soapbox steering, and in particular some of the links towards the end.

scottishcarties | January 4, 2012 - 12:18

In making your own race car,

In making your own race car, a heavy duty wheel is a must. It should be properly installed on your racing equipment.
castors (not verified) | February 28, 2012 - 22:50
scottishcarties's picture

wheel selection

We have found that 20" BMX wheels are more than adequate for the job and that is by far the most common choice because there is a good selection of tyres for that wheel size. 16" and 18" bike wheels are also used.

Some people use gocart, scooter or minimoto wheels. These are very strong, but I've neve seen anyone who is using them win anything.

scottishcarties | February 29, 2012 - 10:23

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