A continuous interest to the B20-type cubic helimagnets doesn't calm down, because of its intriguing properties (quantum phase transition, topology of magnetic phase, critical behaviour, chirality etc.) and possible applications in spintronics. The most studied compounds is MnSi and relative monosilicides, while monogermanides (FeGe, MnGe) are less investigated, due to difficulties of their synthesis. We propose to perform small angle neutron scattering (SANS) experiments with powder samples of Mn{1-x}Fe{x}Ge, where concentration x varies from 0 to 1 with the step 0.1. Taking into account the fact that nobody ever measured these compounds with SANS, the general aim of the proposed experiments is to determine general parameters of these systems (such as the spiral wave vector $k$, the critical magnetic fields $H_{C1}, H_{C2}, H_{A}$). Using the theory, we could calculate all the principal interactions of the system. We need the highest possible flux for our needs, because the quantity of the samples is still small, this is why the ILL instruments D22 or D33 has been chosen.