Extreme care must be taken not to run propellers into sand, gravel, stones or mud, because the grinding off process is so rapid that the blades soon become reduced in size with consequent loss of power.
Ukhathalo olungamandla maluthathwe ukwenzela ukuba umqhubi angayi esantini ematyeni eluhlalutyeni okanye eludakeni ngenxa yokuba ususo lwezizinto luyakhawuleziswa ukwenzela ukutya kwemela kukhawuleze kuncitshiswe kubungakanani ngenxa yesiphumo sokulahleka kombane