FF Series Vertical Knee-up imathandizira masewera olimbitsa thupi osiyanasiyana apakati ndi pansi pa thupi. Mapepala okhala ndi mawonekedwe a chigongono, zogwirira zamanja ndi zogwirira kumbuyo zimapangitsa kuti masewera olimbitsa thupi a bondo akhale olimba, ndipo kugwira dzanja kowonjezera kumalola masewera olimbitsa thupi oviika m'madzi.
Machubu achiwiri ndi malo akuluakulu ochitira masewera olimbitsa thupi amatsimikizira kukhazikika bwino m'njira zonse ziwiri zochitira masewera olimbitsa thupi.
Mapepala a chigongono opindika komanso okhuthala kwambiri amapangidwa mwaluso ndipo amapereka bata komanso chitonthozo pamasewera olimbitsa thupi a bondo.
Zoteteza zazikulu, zoteteza kuti zisagwedezeke, zimathandiza ogwiritsa ntchito kulowa ndi kutuluka mu chipangizocho molimba mtima.
Mapaipi achitsulo olimba kwambiri amapangidwa m'mafakitale ndipo amalumikizidwa m'malo onse omangidwa kuti athe kupirira malo ovuta kwambiri. Chimango chophimbidwa ndi ufa.
Ma pedi a mapazi a rabara ndi okhazikika, amapereka kukhazikika kwa chinthucho ndipo amathandiza kuti chinthucho chisayende.