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HSD L39 Robart liquid sky smoke oil king Tech K85 G4 RC jet airplane 
Robart liquid smoke oil get it from Horizon Hobbys $150 for 5 gallons works great. I am learning how to fly the L39. elevator is a little sensitive. Had to add some expo to stop the porpoising from landing up and down on my landings and get a much smoother approach. Trying to slow it down. I’m still learning. Enjoy the video.
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