Log grapples yog npaj rau kev tuav haujlwm ntawm ntau hom. Log grapples yog qhov tseem ceeb ntawm cov tuam txhab ntoo. Lawv pab txo cov nqi ntawm phau ntawv ua haujlwm, yog li ua kom cov zis ntau ntxiv.
Cov kws tshaj lij tsim cov cav grapples kom haum rau cov qauv tsim nyog thiab cov qauv. Cov duab tshwj xeeb ntawm lub puab tsaig tso cai rau kev ua haujlwm zoo ntawm cov cav ntoo thiab cov ntoo. Cov cuab yeej siv tau yooj yim los ntawm tus neeg teb xov tooj lub cockpit thiab txawm tias ua haujlwm nyuaj xws li tuav cov khoom sib sib zog nqus ntawm cov ntoo.
Cov phau ntawv tshaj lij muaj cov qauv sib txawv ntawm cov cav grapples, tab sis tag nrho cov ntawm lawv yog haum nrog rotators - tshwj xeeb mechanism tso cai rau cov grapples tig 360 degrees.