UK Karting - Notice Board (2-Stroke Karting) : Re: taking 4kg lead off

Notice Board (2-Stroke Karting)

Re: taking 4kg lead off
Posted by 'SimonS' on 18 Nov 2009 @ 21:59

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SimonSJoined: December 2004
Total Posts: 4
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Do a little calculation.

Weight and balance is simply a matter of moment arms, the weight times the distance from the point of support.

If we assume you have a weight of 80kg and your kart has a distance of 1040 mm between axle centres

If we assume that all your weight acts through your centre of gravity, we can predict that to create a change of 10%, you would have to move your CG through your seat by 104mm. (Reality is slightly different because your kart,engine, and fuel all have mass too, and we should calculate their effect) A moment arm of 80*104=8320

So to get the same effect from a 4 kg mass you would have to move it 8320kg mm/4kg =2080mm (over 2 metres) or 20 times as far. (80/4=20 too)

The 4 kg lump on the back of your set is probably only 100 mm from your CG. To correct for it removal would require you to move your seat 1/20 *100mm or 5mm rearwards.

The 2 kg lump under your steering mount is about 700 mm from your CG. you have to move your seat 2/80*700mm or 17.5mm forward.

The 2 KG lump by your petrol tank is 300 mm from your cg. Compensate by moving the seat 2/80*300
=7.5 mm forward.

Of course, you can do same calculation for the vertical distribution, with the 4kg weight 100mm above your CG and teh 2 kg weights 200mm below your CG .

Personally, I would take the 4 kg off your seat back and move the 2kg from the petrol tank to the seat back.

This should result in a move of less than 5mm forward and 0 up or down, a move that I might inore completely (You probably get more change from the fuel (1 kg) you use in the race).

Message Thread:

taking 4kg lead off by 'buzzinrussell' (18 Nov 2009 @ 16:31)

Re: taking 4kg lead off by 'Aquila' (18 Nov 2009 @ 18:11)

Re: taking 4kg lead off by 'Gaz1970' (18 Nov 2009 @ 18:30)

Re: taking 4kg lead off by 'speedyman' (18 Nov 2009 @ 20:13)

Re: taking 4kg lead off by 'rogergreen' (18 Nov 2009 @ 22:52)

Re: taking 4kg lead off by 'buzzinrussell' (18 Nov 2009 @ 22:55)

Re: taking 4kg lead off by 'rogergreen' (18 Nov 2009 @ 23:12)

Re: taking 4kg lead off by 'Aquila' (18 Nov 2009 @ 23:20)

Re: taking 4kg lead off by 'rogergreen' (18 Nov 2009 @ 23:25)

Re: taking 4kg lead off by 'Aquila' (19 Nov 2009 @ 0:09)

Re: taking 4kg lead off by 'rogergreen' (19 Nov 2009 @ 1:01)

Re: taking 4kg lead off by 'Aquila' (19 Nov 2009 @ 7:15)

Re: taking 4kg lead off by 'SimonS' << You are here!

Re: taking 4kg lead off by 'buzzinrussell' (18 Nov 2009 @ 22:49)

Re: taking 4kg lead off by 'Smellthecoffee2' (19 Nov 2009 @ 9:32)

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