Isibane senkungu esiphambili sisibane semoto esenzelwe ukukhanya nge-strip beam. I-beam idla ngokuyilwa ukuba ibe nendawo ebukhali yokunqumla phezulu, kwaye ukukhanya kokwenyani kudla ngokuxhonywa phantsi kwaye kujoliswe emhlabeni nge-acute Angle. Ngenxa yoko, izibane zenkungu zijongise endleleni, zithumela ukukhanya endleleni kwaye zikhanyise indlela endaweni yomaleko wenkungu. Indawo kunye nokujonga kwezibane zenkungu kunokuthelekiswa kwaye kuthelekiswe nezibane zenkungu eziphezulu kunye nezibane eziphantsi ukuze kubonakale ukuba zahluke kangakanani ezi zixhobo zifanayo. Zombini izibane zenkungu eziphezulu nezisezantsi zijolise kwii-engile ezingaphantsi, ezivumela ukuba zikhanyise indlela ekude phambi kwesithuthi. Ngokwahlukileyo koko, ii-engile ezibukhali ezisetyenziswa zizibane zenkungu zithetha ukuba zikhanyisa umhlaba ngqo phambi kwesithuthi. Oku kwenzelwa ukuqinisekisa ububanzi bomfanekiso ongaphambili.
