▁and ▁more . ▁ ▁When ▁a ▁scheme ' s ▁purpose ▁is ▁to ▁prop el ▁ships ▁and ▁boats , ▁the ▁objects ▁t ether - pla ced ▁in ▁the ▁wind ▁will ▁tend ▁to ▁have ▁most ▁of ▁the ▁captured ▁energy ▁be ▁in ▁useful ▁t ension ▁in ▁the ▁main ▁t ether . ▁The ▁al o ft ▁working ▁bodies ▁will ▁be ▁operated ▁to ▁maintain ▁useful ▁t ension ▁even ▁while ▁the ▁ship ▁is ▁moving . ▁This ▁is ▁the ▁method ▁for ▁power kit ing ▁sports . ▁This ▁sector ▁of ▁H A WP ▁is ▁the ▁most ▁installed ▁method . ▁Fol kl ore ▁suggests ▁that ▁Benjamin ▁Franklin ▁used ▁the ▁tra ction ▁method ▁of ▁H A WP . ▁ ▁George ▁P oc ock ▁was ▁a ▁leader ▁in ▁t ug ging ▁vehicles ▁by ▁tra ction . ▁ ▁Control s ▁▁ ▁H A WP ▁aircraft ▁need ▁to ▁be ▁controlled . ▁Sol utions ▁in ▁built ▁systems ▁have ▁control ▁mechan isms ▁various ly ▁situated . ▁Some ▁systems ▁are ▁pass ive , ▁or ▁active , ▁or ▁a ▁mix . ▁When ▁a ▁k ite ▁ste ering ▁unit ▁( K SU ) ▁is ▁lo ft ed , ▁the ▁K SU ▁may ▁be ▁robot ic ▁and ▁self - cont ained ; ▁a ▁K SU ▁may ▁be ▁operated ▁from ▁the ▁ground ▁via ▁radio - control ▁by ▁a ▁live ▁human ▁operator ▁or ▁by ▁smart ▁computer ▁programs . ▁Some ▁systems ▁have ▁built ▁sens ors ▁in ▁the ▁aircraft ▁body ▁that ▁report ▁parameters ▁like ▁position , ▁relative ▁position ▁to ▁other ▁parts . ▁K ite ▁control ▁units ▁( K C U ) ▁have ▁involved ▁more ▁than ▁ste