Zvinoumba helical giya:
1. Paunenge uchibatanidza magiya maviri ekunze, kutenderera kunoitika kune imwe nzira, kana meshing ger yemukati negiya rekunze kutenderera kunoitika munzira imwechete.
2. Kuchengetedza kunofanira kutorwa maererano nenhamba yemazino pane imwe neimwe yegiya kana meshing huru (yemukati) giya ine diki (kunze) giya, sezvo matatu marudzi ekukanganisa anogona kuitika.
3. Kazhinjimagiya emukatidzinofambiswa nemagiya madiki ekunze
4. Inobvumira kugadzirwa kwakagadzikana kwemuchina
Zvishandiso zvemagiya emukati: giya repuranetidhiraivha yeakanyanya kuderedza ratios, maclutches nezvimwe.