>>8850430LEGO was right there. Propellers can be quiet. If they are made of proper material and have proper profile they can be very quiet. Jet will always be loud as fuck.
>The Lockheed YO-3A "Quiet Star" is a single-engined, propeller-driven monoplane that was developed for battlefield observation during the Vietnam War. It was designed to be as quiet as possible, and was intended to observe troop movements in near-silence during hours of darkness. The YO-3A was not armedhttps://www.wmof.com/yo-3a.htmhttps://www.youtube.com/watch?v=YS_dgXWl5-4