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Things that make you go hmmm...

posted 22 Oct 2010, 14:50 by Thomoco
... I have been machining loads of wheels today, I need a different wheel for each of the different gear ratio options that we have to try out. Whilst I was busy with Reggie the Router (don't ask) I got wondering about distance and speed etc...

Have I got this right? Being a simple man with simple needs, I tend to go about things in a simple way but I need some confirmation on my calculations to work out the potential top speed of The Splinter...

If the circumference of the wheel is 2222mm and there are 1000 metres to a kilometre, then to work out the RPM to SPEED ratio do I simply divide 1000 by 2.222 then divide by 60 (minutes) to give me 7.5 revolutions of the wheel for each KPH value?

For example if the wheel rotates at a rate of 75 RPM then is the speed 10KPH?

Let me know if I have this correct as it seems too simple to a chap like  me...
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