tIANci ... I have learned to use motocalc more for comparison then to calculate real life numbers, therefore if I keep everything the same as in my previous simulation just changing the prop to 2 blade 18x10 this is what comes out:</p>

At the best lift-to-drag ratio airspeed, the excess-thrust (5227g) to weight (4195g) ratio is 1,25:1</p>

This is, from my point of view, the most important info we can get from motocalc. We actually can feel this as the "reserve" of power we have from a certain combo. So comparing this combo to a previous one, yes it would feel better then the previous one but not that much, but with less braking effect. Anything better then 1,05:1 is very good. This is my conclusion after countless hours [8D] spent in motocalc analyzing all possible combos used by the Pro guys!
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And as the last thing, hypothetically if there would be an 18x10 3 blade, then the result is fascinating 1,39:1 for 70A static. If only at reasonable price ...</p>gaRCfield ... 16x11 looks also very good 1,36:1 but lets not forget that reduced diameter and increased pitch will worsen the braking effect (and that is why we have started all this discussion ) resulting, probably in worse braking effect then with 18x10

Mejzlik 3 blade 18x10 is 90$ +, sorry, too much for my taste