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Solidity
Each prop has a maximum limit to the amount of thrust it can produce. If the aircraft designer requires more thrust, then a prop with greater solidity will be required. Solidity is the ratio
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The Lockheed P3-C Orion has wide chord, paddle blades with blade root cuffs for greater solidity and improved intake air flow. |
of total blade area to total prop disc area, which can be found from the following formula:
Solidity = S/nR2
Where S = total blade area tcR2 = prop disc area
A two-blade propeller has a solidity of about 0.08 increasing up to around 0.16 for a four-blade propeller. Solidity, and therefore thrust, can be increased by using a prop with either:
• A greater diameter
• A greater number of blades, or
Wider chord blades.
The propeller diameter has greater influence on power absorption than the number of blades or blade chord.
