CRITERIA FOR HOLDING POWER
The holding power comparence of an anchor can be derived from the following formula: fluke area (m) x penetration(m) = m x m = m = tons
Building up Resistance
A Minimal Amount of Resistance
A Minimal Amount of Resistance
Clod forming (square shank) can effect breaking out
Clod cutting (by shank shape)
In hard soil a 50 degree fluke shank angle will obstruct penetration and the anchor will begin to trip faill aside and slide along the seabed.
In hard soil an achor with a fluke angle of 32 degrees will give the highest holding power.
Note: The fluke area is limited by strength; penetration, however, is restrited by the anchor type and the chain (wire).
A decreased anchor penetration duo to the chain; it is partly compensated by the holding power of the chain.
The wire allows the anchor to penetrate deeper, which results in a greater holding power
HOLDING POWER OF ANCHOR
The holding power is a combination of the following parameters
- A) the weight of the anchor
- B) the weight of the disturbed soil
- C) the friction of the disturbed along fractured lines
- D) friction between fluke surface and soil (fluke area)
- E) the compression of shank and cable
If used in mud, an anchor with a 32 degree fluke shank angle will not penetrate sufficiently
Fluke/Shank Angle
The fluke shank angle is one of the factors that determines the soil penetration of an anchor
In normal anchor grounds and hard soils, a 32 degree fluke shank angle must be used. In soft mud, a 50 degree fluke shank angle offers optimal penetration
If an anchor is used with an incorrect fluke shank angle, it will negatively influence performance. This is true for all anchor types.