Why can we not research planes in our tanks

So i finished the british ground tech tree and heli tech tree and i was told by a cc if you complete these you can research the planes and ships as i can never get a game vs players in ships and i cant fly planes with control pad for sh@£. But theres no option so where does the xp i earn in ground go once i cant research amything?. I was hoping i could research the planes and ships by playing ground.

Apparently you can research the tanks by playing planes but not the other way round why is this a thing bit unfair im a grinder not very good at game but i try and i like completing tech trees for some strange reason done all tech trees on wot,s console even had a shiny coin for doing it lol

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You can’t.

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You can use tanks to research Helicopters, that’s it. If you get kills with planes in ground you get plane RP, Heli kills get heli RP etc. Although I have often wondered if people think CAS kills give tank RP and that’s why there is so much CAS spam at lower ranks.

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Be nice if we could grind air out with ground when we complete the tech tree and visa versa

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Nah it’s not needed. Helis need to be grindable by both branches though. Since we all know playing helis to research helis is just a non starter.

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Gaijin would never do it, but its a good idea. Damn, I’d even take an RP penalty of 75% on the ground RP if it went into planes.