Keel, rudder, propeller and appendages

Keel, rudder and propeller can appear together in a profile but answer different questions. We begin with lateral resistance, steering and propulsion, without turning a silhouette into a performance or strength ranking. The drawing combines side and rear views to reveal elements hidden from one viewpoint.

We then follow the relationship between control, transmission and rudder. A wheel is not the rudder blade, and two wheels do not imply two rudders. Canonical keel, rudder and propulsion lessons explain the families in more detail; here you learn to recognise them and distinguish system parts. A historical steering example identifies its document and configuration rather than applying to every similarly named boat. Repair, adjustment, grounding and emergency steering belong to separate content requiring specialist review.