To have "half static thrust", i.e. 4,7 kg, would require 5900 rpm, which is 1,28 Hp and give a pitch speed of 108 km/h.
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Well that's nice to know---as I said(in post 5) 6000 is where I have mid-stick,and,for me, that gives a linear "feel" to the throttle when flying.

Now for a slightly different case--I've just started flying a little electric thing for ,hopefully, Winter practice (Vanquish f3A).
I'm a more or less complete novice with electricity.
I've set the ESC thingy to be at stop on a switch for the bottom stick position, and then at the lowest possible idle (by the switch) for flying(with no brake)
This seems to work well.
The only slight hitch, is that everything happens a bit higher up the throttle stick position,compared with my IC set-up.
Can I adjust this with a throttle curve, or would that confuse the ESC?