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just to add to my previous post:

the plane crashes sep 1910 and from oct 1910 my small-engined cars do not sell a unit.


also to reply to some people's questions about research, it all has to do with the year, i.e. at the early stages of the game you cannot develop too powerful motors/chasses.

some combinations that work are:
2 cylinder 10 hp engine + chassis 10 hp
4 cylinder 25 hp engine + chassis 25 hp
6 cylinder 50 hp engine + chassis 50 hp

the engines and the chasses can be combined with different car bodies i.e. open/soft top/hard top or even different categories as small/medium/large, so these three combinations have given me 7+ cars

hope these guidelines help.