Inventor Vern Ader has just been granted (Aug 10th 2021) a full US patent for his ‘Centrifugal Bed Rotator’. The new invention is a progressive development of his Gym & Rehabilitation System Designed for Space – in that it can centrifuge not just one, but two people at the same time. The present invention provides […]
Tag: spin
The mystery of the whirly tube’s missing fundamental mode [study]
The musical instrument shown above is known by various names e.g. the whirly tube, the corrugaphone, the bloogle resonator, the voice of the dragon, the hummer, and even, according to American composer (and parodist) Peter Schickele the “Lasso d’Amore”. For acousticians, it’s noteworthy because the fundamental acoustic mode, that’s to say the note that one […]
A phony force experiment, revolving around children
Centrifugal force, which is (technically) a phony force, is at the center of this experiment about spinning children. The video presentation is of the sort known as “spinning a yarn”: (Thanks to investigator Laura Bassett for bringing this to our attention)
Shuttlecock aerodynamics : part 4 : an enigma
The 16 feathers traditionally used to construct traditional shuttlecocks are normally organised in an overlapping spiral arrangement. As a result, the shuttlecock tends to whirl in flight, adding spin-stability to what would otherwise be a more haphazard trajectory. But raising the question, in which direction should it rotate? The Badminton World Federation (which oversees international […]
