R/C Dictionary Part 3 : Clunk –A weighted fuel pick-up used in a fuel tank to assure the intake line is always in fuel.DMSS (Direct Sequence Spread Spectrum) –A 2.4GHz radio system which selects one (or two) of the available “free” frequencies and transmits only on the one(s) chosen. Like FHSS (Frequency Hopping Spread Spectrum)