This is the OXY 5 and its a real game changer for the 500 to 625mm blade classes With amazing flight performance and set-up options. Lynx Heli and Oxy Heli are always looking for ways to improve and try to meet Tareq Alsaadi and all there Team Pilots requests for extreme performance beyond the limits worked hard to “upgrade” the OXY 5 by adding extra features. The OXY 5 HF is a Racing Edition a Competition Machine to push your limit and introduce a new sick looking machine. Basically the 5 HF is a Limited-Edition kit based on the standard OXY 5, then all new parts designed for the HF are compatible as tuning upgrades for your standard OXY 5 that will give you an extra option of upgrading only what you want or need.