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General Science / Re: Are lithium cobalt batteries as good as this advertisement claims?

« on: 16/12/2017 19:04:33 »

and why would it be only suitable for petrol vehicles?

Perhaps because Diesel engines have significantly higher compression ratios. A greater starting torque is required, therefore a greater current from the starter battery. 

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Physics, Astronomy & Cosmology / Re: Could magnets be used to drive cogs or gears, instead of mechanical teeth?

« on: 30/10/2017 20:55:03 »

Yeah, a gear box would seem impossible to me. Plus it would probably be very expensive to engineer and produce so i doubt it would ever happen.

Hello there,
Did you look at the link I posted?:-
 http://www.magnomatics.com/pages/technology/low-ratio-magnetic-gears
I know nothing about this company however
 

3

Technology / Re: Can you make a power shower with induction heating?

« on: 30/10/2017 20:39:59 »

Just for interest's sake, many years ago (when the UK had a substantial engineering industry) I worked for a company which made moulding machines (presses) for the plastics industry. This company was almost unique in using induction heated platens to heat the press tools (moulds). These induction heaters were powered directly by the 50 Hertz mains current. As I recall, they were rated at up to, something like 20KW, and compared to resistive heaters produced a very even temperature tolerance across the heated area.