We propose to measure the spin wave spectrum on the IN5 spectrometer of several co-aligned single crystals of MnSb2O6. This material has a structural chirality owing to its P321 space group, like in the largely studied chiral Fe langasite compound. The MnSb2O6 magnetic ground state has been shown to be made of coplanar cycloids propagating along the c-axis from a triangle of 120° spins. From the foreseen measurements and their comparison with spin wave calculations, we plan to identify the ingredients stabilizing this peculiar arrangement and its difference with the langasite one. This will also be complementary to ongoing studies with THz spectroscopy on synchrotron source aimed at unveiling magnetoelectric excitations.