itan . ▁ ▁The ▁ 7 K ▁is ▁very ▁compar able ▁to ▁the ▁Br istol ▁Ne pt une ▁seven - cy l inder ▁engine ▁since ▁they ▁used ▁the ▁same ▁technology . ▁The ▁ 7 K ▁was ▁followed ▁by ▁the ▁larger ▁and ▁more ▁powerful ▁nine - cy l inder ▁ 5 5 0   hp ▁( 4 0 5   k W ) ▁G nome - R h ône ▁ 9 K ▁M ist ral . ▁ ▁G nome - R h ône ▁later ▁respond ed ▁to ▁the ▁need ▁for ▁a ▁more ▁powerful ▁engine ▁by ▁developing ▁the ▁ 7 K ▁into ▁a ▁two - row ▁version ▁that ▁became ▁the ▁G nome - R h ône 1 4 K ▁M ist ral ▁Major . ▁ ▁Vari ants ▁I AR ▁ 7 K L ic ence ▁production ▁in ▁Roman ia ▁by ▁Indust ria ▁Aer onaut ică ▁Rom ână ▁( I AR ). ▁ ▁App lications ▁ ▁Spec ifications ▁( 7 K d ) ▁ ▁See ▁also ▁ ▁References ▁ ▁Notes ▁ ▁Bibli ography ▁▁ ▁G unst on , ▁Bill . ▁World ▁Encyclopedia ▁of ▁A ero ▁Eng ines . ▁Cambridge , ▁England . ▁Patrick ▁Steph ens ▁Limited , ▁ 1 9 8 9 . ▁▁ ▁Category : 1 9 2 0 s ▁aircraft ▁p ist on ▁engines ▁Category : A ircraft ▁air - co o led ▁radial ▁p ist on ▁engines ▁ 7 K <0x0A> </s> ▁Kal ahu ▁( , ▁also ▁Roman ized ▁as ▁Kal ā h ū , ▁Kol ahoo , ▁and ▁Kol ā h ū