Fin (Longitudinal Footed Fin / Wrapped Fin)
This is the most basic and cost-effective type.
- Manufacturing Process: A strip of aluminum (or other metal) with a pre-formed “L”-shaped foot at the base is wound helically around the base tube under tension. The “L” foot provides the primary contact surface with the tube.
- How it Attaches: The bond is purely from the tension of the wrapped fin and the contact of the “L” foot.
- Advantages:
- Lowest cost to manufacture.
- Provides a high finning ratio (a lot of surface area).