Disclosed is a rotational friction brake (1) regulated by the rate of change of the angular speed, comprising: a first body (10), a second body (12) rotationally attached to said first body, said second body being arranged to rotate around a rotational center axis (14) of said second body, at least one braking arm (16) rotationally attached to said second body in a pivot point (18), wherein said pivot point is eccentrically offset to said rotational center axis, said at least one braking arm comprises a braking member (21a, 21b) arranged to frictionally engage a part of said first body, said at least one braking arm having a mass center (22) placed at a distance from said pivot point (18) that is longer than a distance from said pivot point to said rotational center axis (14), wherein said braking member is arranged to frictionally engage said part of said first body. The disclosure further relates to a fishing reel (50) comprising such a rotational friction brake.
