Tsheb -saib daim iav koom nrog lub tswv yim ntawm thaj chaw ntawm kev pom- tshwj xeeb, thaj chaw pom ntawm daim iav qhov chaw. Kev lag luam txheeb xyuas peb yam tseem ceeb uas txiav txim siab qhov kev pom no: qhov kev ncua deb ntawm tus tsav lub qhov muag thiab daim iav, daim iav qhov ntev, thiab nws lub vojvoog ntawm curvature. Cov yam tseem ceeb no muaj kev cuam tshuam: muab qhov kev ncua deb thiab qhov ntev, lub vojvoog me me ntawm curvature ua rau pom dav dua; conversely, muab ib tug tas mus li vojvoog ntawm curvature, loj daim iav qhov ntev yield ib tug wider teb ntawm saib.
Tsis tas li ntawd, kev cuam tshuam yog qhov tseem ceeb ntawm kev ntsuas kev ua haujlwm; siab dua reflectivity ua ib tug clearer duab. Cov theem ntawm kev cuam tshuam yog nyob ntawm cov khoom siv ntawm cov txheej txheem reflective siv rau daim iav sab hauv.
Raws li kev ceev ntawm cov neeg caij tsheb nce, cua tsis kam thiab suab nrov dhau los ua qhov tseem ceeb ntawm kev tsim qauv. Yog li ntawd, sab nrauv profile ntawm sab iav yuav tsum yog aerodynamically optimized, siv smooth, rounded contours kom txo tau ob qho tib si cua kuj thiab cua suab nrov.