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Constructional Details - Thickness Calculations - Coggle Diagram
Constructional Details - Thickness Calculations
Achieve
Minimum Thickness of blade
Calculations
Simplest method
Estimate point to apply concentrated force
Calculate stress near root
Refinement method
Loading pattern
from root to tip
According to Circulation Theory
Ignores variation of load
across chord
Schoenherr
Propeller-blade strength
Considers
Bending moment due to
Hydro forces
Centrifugal force
Rake
Skew
Thickness assumption
decreases linearly from root to tip
Representative point
to calculate stress
Position of maximum thickness
maximum stress
Not valid for high skew propellers
High Skewed Propellers
Cummings and Boswell
All propellers
Maximum stress position
0,5 R from Hub
at 0,3 R
Half chord
moves towards trailing edge
as increases skew