Soundproofing As a little extra, we have chosen to soundproof the a/c as much as possible. Small as well as large a/c, has problems with noise. In small aircraft there can be a lot of it. The majority of this noise is from the engine/prop. Those things are hard to change, and somewhat complicated. What we can do, however, is to dampen the vibrations created throughout the a/c by the engine and prop. Our rotary engine helps us alot since it dosn't vibrate in the same degree as a pistonengine. We have also chosen a threeblade prop that creates less noise than a twoblade. We mount specially designed dampening panelse throughout the a/c that dulls the aluminium. They are glued onto the insidesurfaces of the a/c. The fact that our engine weighs 45 kilos less than the lycoming installed in the factory demo, enables us to put a lot of weight on the firewall. To maximise the dampening effect in this area, we will use tdampening panels used in cars, wich are a lot heavier and therefore are more effective. There are a noticeable difference before and after the panels are installed. Knockning og two surfaces, one without panels, the vibrations has a higher pitch than where the panels are installed. It dosn't sound as "metallic" as before. Besides the panels, all hollow spaces are filled with insulationmaterial wich also helps in fighting off the noise. The panels has aluminiumfoil on the back, and are installed everywhere possible.