BIO325H5 Lecture Notes - Lecture 1: Sidewinding, Seismic Wave, Biomimetics
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2) lift-based mode: lift forces are generated in the plane perpendicular to the direction of the fin motion, whereas drag forces appear in the plane of the fin motion. As a result, in lift-based labriformmode, for the pectoral fins to propel the fish forward, they have to move up and down in a plane that is roughly perpendicular to the main axis of the fish"s body. This implies that no recovery stroke is necessary and lift can be generated during both the upstroke and the downstroke. Additionally, lift forces can be an order of magnitude greater than the drag forces generated by a fin of the same area. Thus, lift-based fins can generate larger, more continuous, and more efficient thrust than fins performing rowing motions. Retrograde body waves generate reaction force, resolvable into side forces and thrust. When done by a snake this is termed serpentine movement.
