Ko te kaipahua rakau he taapiri i utaina ki runga i nga keri me etahi atu miihini hanga. Ko nga painga o te kaihopu rakau ko tona kaha ki te hopu me te ngawari o te mahi whakahaere, ka taea e ia te mahi pai i roto i nga momo mahi uaua. Ka tino whakapai ake i te pai o te whakahaere rawa, ka whakaiti i te kaha o te mahi a-ringa, ka taea te urutau ki nga momo me nga whakaritenga o nga rawa.
| Tauira | Waeine | RWG75 | RWG150 | RWG280 | RWG380 | |
| He pai mo te tone paerewa | T | 6-10 | 12-16 | 20-30 | 33-42 | |
| Rahi | Teitei katiA | mm | 1840 | 2210 | 2640 | 3020 |
| Tuwhera teiteiB | mm | 1620 | 1930 | 2510 | 2750 | |
| Rahi whakatuwheraC | mm | 1650 | 1730 | 2200 | 2590 | |
| Te whanui maikukuD | mm | 445 | 600 | 728 | 900 | |
| Te roa o te maikukuL | mm | 1080 | 1330 | 1550 | 1860 | |
| Tawhā | Te kaha mau o te pito maikuku | KN | 22.6 | 39.8 | 73.8 | 92.3 |
| Te whakatuwhera me te kati te pehanga whakatau | Mpa | 23 | 28 | 30 | 30 | |
| Te whakatuwhera me te kati i te rerenga whakatau | L/min | 70-90 | 120-160 | 250-300 | 330-380 | |
| Te pehanga whakatau mo te hurihanga | Mpa | 12.5 | 12.5 | 18 | 18 | |
| Rere reanga hurihuri | L/min | 20-35 | 20-35 | 30-60 | 30-60 | |
| Tere hurihuri | rpm | 9-12 | 9-12 | 9-12 | 9-12 | |
| Taumaha | kg | 680 | 1510 | 2350 | 2850 | |