Post here all non technical related topics about Formula One. This includes race results, discussions, testing analysis etc. TV coverage and other personal questions should be in Off topic chat.
why all the teams were waiting for europe grand prix
Is just because they are near to there factories and thier development centers or waht?
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Also the teams only bother sending as few parts as possible to the far away GPs. They do not want to bother carrying useless parts around so they go to Europe and haul those useless bits, try them on the car and if it makes a difference keep them.
Murphy's 9th Law of Technology:
Tell a man there are 300 million stars in the universe and he'll believe you. Tell him a bench has wet paint on it and he'll have to touch to be sure.
Usually, first 3 races are held far away from Europe so teams don't have chance to send cars back home which means that what they initially send to first race must last for 2 more races. That often includes more reliable engines (reduced power). That is why there are so many new aero updates and engine specs. once F1 returns to Europe.