[john martin]

maybe when PV Panels improve more we will have solar TMs.

A 4kw system would be 20 grand ...  and you better buy an artic to put them on 

[robert meldrum]

What you're saying is true to a certain extent..................a formula 1 racing engine the same size as a production car has been " engineered " to obtain the maximum power from what is basically the same unit.

Like wise you will find electric motors or pumps or blowers of the same proportions made of the same materials and powered by electricity at the same wattage...............BUT WITH HUGELY DIFFERENT PERFORMANCES so, theory is fine , but theory is only the start of the development journey and the evolution that follows.

[john martin]

What you're saying is true to a certain extent..................a formula 1 racing engine the same size as a production car has been " engineered " to obtain the maximum power from what is basically the same unit.

Like wise you will find electric motors or pumps or blowers of the same proportions made of the same materials and powered by electricity at the same wattage...............BUT WITH HUGELY DIFFERENT PERFORMANCES so, theory is fine , but theory is only the start of the development journey and the evolution that follows.

But you dont get anything for nothing in terms of energy transfer ... in the case of the F1 car the cost of making your 2.5 engine high powered is more energy needed in terms of higher fuel consumption ... in this case 3.5 mpg of racing fuel ...

Im no expert on these motors , but i can see that there are parameters that determine the performance ... the size of the electric motor ... the width/ mass/heigth   of the fan ...
Lift and cfm are inversely proportional  ... if they alter one parameter to increase performance it decreases it some where else ..
eg ... this 5 stage motor has over 200" of lift  ....  but at the cost of cfm which is only 60

http://www.centralvacuummotor.com/Lighthouse/LH-HVLP-5S.jpg