I came over some discussions where people argued that smaller units have advantage over biger ones regarding recon by the enemy. Sounds logical.
I conducted some tests with several NATO units (wiesel(small), sheradon(s), Jaguar(normal), Leo2(big), Luchs(s), MILAN Inf(n)) getting explored by PACTs good and very good mechanized ground recon in different surroundings.
(Of course all weapons were disabled)

The result is:
size doesnt matter, all the armored vehicels beeing discovered at the exact same range, then on some closer distance the armored recon units (Luchs) and then finally the infantry unit on significantly shorter range.
The Surrounding had no effect on this (deeper in forrest, at forrest edge or in open fields).

By the way the different kinds (colored) of fields have no effect on stealthiness either.

You mean for the spotter or the target ?

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Eugen's law of maximal pain in the ass : If anything can go wrong, it will go wrong on Friday evening.

I simply mean, the surrounding has no effect on the fact that size doesnt matter for beeing spotted.

Of course, deeper in the forrest you are generaly spotted later than at its edge (on shorter distance), but still the relative differences in the range remain the same and are not about the units size but about its class... first your Armors are spotted (independet from their size), then your armored recon, then your infantry.
I didnt check about helicopters.

Size should only affect accuracy.

Big normal accuracy
Medium -5%
small -10%

That I have heard people saying.

So having small size is -10% accuracy but when having two veteran level, you get about +7% accuracy.

you want to check how size affect spotting? we did lot of test with LVA during the beta and i will let you know the easiest way to see it....

take a large areaf free of tree... take an uaz... put it in the midddle.

Comme from far away withe a big size tank and an inf...... NOW you see the difference???

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I would expect eugen too factor in size for the ability too see hidden units(and optics factor),would seem strange too me that they would have omitted this?

Im also disappointed that apparently the Ai can see you where ever you are regardless of how well you have hidden your unit if that is what im seeing posted on the forums to date,hopefully this can be fixed if this is true?

He was talking about the difference between big, medium and small armored vehicles.

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"You're not Stalin, and zone Bravo on Hell's Highway is not your motherland." - TheFluff

That's very surprising because I've seen multiple times heavy tanks being spotted first in the middle of medium tanks...

Could you describe your testing method please ?

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Eugen's law of maximal pain in the ass : If anything can go wrong, it will go wrong on Friday evening.

Ok then conclusion is:

Size of your vehicels doesnt matter for their stealthiness/beeing spotted,
but for the hit-accuracy of your enemy targeting them.

@Lusiad_NZ: never played with AI, almost impossible to check if its "cheating" regarding recon

Yes, hopefully they will fix it and change AI behavior so that it starts sending more recon units to search enemy in and around point zones and tries more to hold all kind zones and attack to ones what are weak/empty.

I would be happy even for that AI could call unlimited amount of recon units (just having specific amount on map at time so no 50 recon unit at once).