This is the 2258th most frequent Russian word.
запуску
Launch; start; initiation.
In this sentence, 'запуску' is used in the dative case to denote the process or point in time related to the launch of the project.
Мы подготовимся к запуску нового проекта.
We will prepare for the launch of the new project.
Here, 'запуску' indicates the process involved in initiating the engine, used in the dative case after 'относимся'.
Этот механизм относится к запуску двигателя.
This mechanism relates to the starting of the engine.
'Запуску' is used after the preposition 'к', indicating a preparatory action towards the event of launching.