Wind more dense in South Africa ?
Hmmm, I dont think so, not much...
But if it feels more powered, there could be other reasons, but I can not see why the density should be that different.
The air is mid day around 27C (80F) in the summer (now) and of course the density is lower if warmer, but I doubt that it would make that big an impact.
As the water is colder, the air might be less than 27C, true, but even if the air is 15C warmer in other countries (around 40C maybe), the difference is only 4-5 % in density thus 4-5 % difference in power and lift too.
So if you are talking about this difference 3-5% max, you are right
I think it is mostly because it is windier out on the water in Capetown, as simple as that.
Because it is fully sideshore, the wind is quite low over the land, but lots as soon as out in the break
Waveriding is typical with 4-8m2 kites every day in this area, and half the time the months we have been there, with 5-6m2 (for 80kg riders)
Occasionally on low wind days, you might be able to ride with a big 9m2 kite, in waves, but quite rare down there.
So air temperature can be felt, for sure - but IMO not a huge difference from CT to other countries...
Comparing winther (0C) to high summer (30C) is an easy difference to feel, as this is around10% in density difference, which means a 10m2 instead of an 11m2 has the same power.
But the difference sometimes feels a lot bigger than that, because (here) the wind is way more gusty and changing in the winther - and more steady in the summer.
So we get the impression, that the wind is much "harder" so to speak
Just some thoughts and observations.