Additionally, the presence of multiple bodies in relative proximity may incur so called "'interference drag "', which is sometimes described as a component of parasitic drag.
12.
Also, a fixed-gear taildragger exhibits less interference drag and form drag in flight than a fixed-gear tricycle aircraft whose nosewheel may sit directly in the propeller's slipstream.
13.
Wing roots usually bear the highest bending forces in flight and during landing, and they often have fairings ( often named " wing fillets " ) to reduce interference drag between the wing and the fuselage.
14.
Clustering them in a nacelle offered several advantages over individual nacelles as it reduced overall drag and minimized interference drag, but had the major operational disadvantage that an uncontained fire in one engine could disable its neighbor as well and the early jet engines were not reliable, so this was a significant risk.
