think there is something wrong with floating point calculation, I have no 1 point of research.
Actually, I did not understand why my rocket with 5 research modules bring 6 databanks (300 databanks per flight, 2 flight, I obtain 600 research points totally, I though it should be 250 per flight. I was sure, that it will be enough for petroleum engine research, but I have no 1 point. It's frustrating, because now I need to make oxylite for 20000km flight.
If it may help, I have only one researcher with 22 science.
get 600 research databank
get researcher with 22 science
make research for petroleum rocket engine
build oxylite generator because you have no 1 research point from databank