Quote:
Originally Posted by Sil_liS
Going from 9" to 12", if you keep the form factor, the surface area increases by a factor of 1.77, so that means going from 450g to 800g for the device. The 200g cover becomes a 350g cover, so you still go over your ideal 1 kg weight unless you lose the cover.
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No: I hypotesized 200g MORE to keep into account the larger panel, before taking into account the additional weight needed for structural reasons. This, assuming that the 9" panel weighs 200g (and I don't think it's so heavy) means an increase of a factor of 2. On the other hand, the battery (which I assume is the other main reason for the weight of the device) would not need a proportional increase in size and weight. You seem to be assuming that the only thing with a weight in an ereader is the screen.
By the way, the "350g cover" was, in my post, something like a 150g cover + a 150g backplane. Aluminium weighs 2.7g/cm3: so with 300g you can get 111cm3 of it. An A4 sheet of aluminium 1mm thick has a volume of around 30cmx20cmx0.1cm = 60cm3, so with 111cm3 of it you could fit the ereader with a 1mm thick metal backplane and a 0.8mm thick metal cover and still remain within the 1kg limit.