Think I am going to start making a few venturi for RC engine this way you can use your rc engine as a control line engine as well.
Going to start this sometime in 2023 I got a Metal Lathe I have seen this work on 4 stroke rc engines as well back in the 80s at a fun fly for control line flyers.
First one will be for my O.S. 61 SF ABC engine this engine is super strong and you can burn hole in the sky lol. I also need to learn how to make the needle valve for some of the engine I have.