This new experiment can be effective for use on cruise ships and trains.The BYU team aimed at three valve conditions during the flush.A cheer for those who get terrified of the noisy airplane toilets. It showed a 5-10 decibel decrease during the flush valve opening. Further, they added extra piping to increase the distance between the flush valve and the toilet bowl."Now with the reduced cabin sound levels, the sound of the toilet flushing wholesale plastic toilet seat is more noticeable and customers are pushing back," Sommerfeldt added.At 38,000 feet, it pulls the air at nearly half the speed of sound."Airline companies have always had standards for the toilet noise, but they have never met those and there has never been much pressure to do so," said Sommerfeldt. The pipe attachment at the bowl was given a more gradual bend than the earlier 90 degrees. So, we've used good physics to solve the problem," said lead researcher Kent Gee. Brigham Young University (BYU) physicists have come out with a way to address their concern.The BYU researchers have invented a vacuum-assisted toilet after two years of trial."The toilet is much quieter and now kids won't think they're going to get sucked out," said Michael Rose, lead author. This new toilet makes half the noise as compared to a regular airplane commode. Airplane toilets require partial vacuum so as to flush with little water.The BYU researchers have invented a vacuum-assisted toilet after two years of trial. It can even be used in new green building projects that aim at reducing water usage. When things move at this speed, any interruption can create noise.This new test demonstrated aero acoustically-generated noise dropped up to 16 decibels during the flush valve opening.Airplane toilets require partial vacuum so as to flush with little water."People have told us they don't want their kids to be scared to use the bathroom on a flight. At 38,000 feet, it pulls the air at nearly half the speed of sound.