Thud_4 is short in length -- 25 milliseconds. This is the dry, pure thud, with no reverb. Try adding some silence of varying lengths after it and forming a loop -- makes a nice rotor sound for a helicopter. It has more high-frequency component to it than any of the lower-numbered Thud's.
A thud is an impulsive but very short low frequency sweep downward, so short that you cannot discern the sweep itself. I have several thuds in this pack, each sounding rather different and having a different duration and other characteristics. They come in a mono dry variation (very short), and in a variation with stereo reverb added. All are 48KHz 32bit floating point format. Each is completely synthetic for purity, created in Cool Edit Pro. These can be useful for sound sweetening in film, etc., or as the basis for a new kick-drum sample (no beater-noise).
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