How I motorised this contra rotating 1/72 Kamov

I've motorised numerous models in the past but never a twin rotor helicopter with contra rotating props. This is a test build for one such model, the Kamov Ka29 Helix. It's a Zvezda kit re-boxed for Italeri.
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Mike

[@septiccalling8341]

Never in doubt 😉
Classy mate 👍🏻👏🏻👌🏻

[@rodolfohdz7454]

Awesome dude!! I never imagined how could do to make the inversor spin
Greetings from México

[@cadetecamundongo-rj6xn]

Mike meu brother Tmj sempre ok não estava recebendo notificação fo TH-cam ok más recebi e observei essa maravilha 😊😊😊😊😊 parabéns 👏🎉🎉🎉👍 Brasil pátria amada meu amigo 😊