I had posted several links on a tennis website more than a dozen years ago. Unfortunately, most of those links are no longer valid. But I did come across a video from an episode of Sport Science (ESPN) from a while back that discusses the effect of using increased weight for golf and baseball: You might also try some research on Overload-Underload Training. I believe this type of training was initially developed for various track and field events -- particularly where objects are utilized or thrown. It was subsequently applied to baseball and other sports. For the Overload phase of the training, the mass of the implement or the projectile is increased somewhat to develop strength. However, the mass (or MOI / swing weight) is increased no more than 20%. Increases greater than this can significantly alter joint / muscle recruitment and swing mechanics. The next phase is the Underload phase where mass (or MOI) is decreased from the norm by (no more than) 20%. This phase is intended to develop power -- bat speed, club speed, racket speed, throwing speed. Note that both of these phases will tend to alter swing timing (or throwing timing). So, a 3rd phase is often employed, using a normally weighted implement or projectile, in order to re-establish proper timing.
For tennis, the dwell time (how long the ball is in contact with the stringbed) is typically 4 or 5 milliseconds. This dwell time is pretty much independent of swing speed but is affected by string tension and, to a lesser extent, other physical factors of the racket & ball. The typical dwell time for badminton contact may be a bit different but is probably still on the order of a few milliseconds. There is a considerable amount of info (studies, books & articles) on sports physics for golf and tennis. No doubt that there are also some sources, in English, for badminton physics. I will try to dig up a couple of sources to get you started if you are interested Even tho Hawkeye typically employs 6 to 10 high speed cameras and some pretty sophisticated algorithms for line calls, the system will very rarely, if ever, pick up the actual bounce (court contact). That contact is probably only 3 ms or so and will usually not be seen by their high-speed cameras. (Ultra-high speed cameras, that can catch the actual bounce, are much too expensive to be practical for a line-calling system such as this). So, what we actually get from the Hawkeye system is calculated (extrapolated) trajectories and contact based on the information gleaned from several high speed cameras. A knowledge of physics along with some sophisticated software algorithms is utilized to present those graphic representations of trajectories and court contacts. The contacts we are shown are supposed to be within a few mm, on average, from the actual contact. So a graphic representation that shows the ball or shuttle to be IN or OUT by 1 mm (or even 3 mm) can very well be incorrect. The challenge might be even greater for tennis than for badminton since wind is a significant factor. There are also Magnus effect factors for various types of spins employed in tennis. Magnus effect has a pronounced effect on trajectory. Badminton primarily employees only one type of spin. Even tho there is considerable air drag, there is little or no Magnus effect TMK.
A bit of badminton physics: https://phys.org/news/2015-06-physics-badminton.html https://physics-badminton.weebly.com/the-physics-behind-everything.html
