Turboshaft engine with parallel shafts

The invention relates to a free-turbine turboshaft engine including, on the one hand, a gas generator comprising at least one compressor (1) supplied with air, a combustion chamber (5) receiving the compressed air at the output of said compressor (1), and at least one generator turbine (7) mechanically connected to said compressor (1) by a drive shaft (15) and driven by the gases from the combustion of fuel carried out in said combustion chamber (5), and including, on the other hand, a free turbine (11) supplied by the gases from said combustion after passing through said generator turbine (7) and which drives a power shaft (12) positioned non-coaxially relative to the drive shaft (15) of the gas generator and supplying the power of the turboshaft engine via a reduction gear (13). According to the invention, the combustion chamber (5) is a substantially cylindrical or frusto-conical chamber, coaxial with the axis of the generator turbine and comprising a single injector (6).