Why do wine bottles (usually) have a raised-up internal dome-like structure [its technical name is a ‘punt’] at the bottom of the bottle? If you have a theory about such things, yours can be compared to a substantial list of possible explanations – bearing in mind that experts in the field are as yet undecided […]
Tag: enigma
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 […]