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one blade appears inverted
Hi
i’m trying to optimize a two blades propeller using prop mode, when i do optimization on blade of the propeller looks like inverted upside down, how can i fix this.
Hello Ahmed,
the optimization algorithm for propellers in QBlade is based on the following publication:
Adkins, C.N, Liebeck, R.H: “Design of Optimum Propellers”, Journal of Propulsion and Power, 1994
This is not a general BEM-based optimization, but a dedicated optimum-propeller design method based on the assumptions described in the paper. It uses the prescribed design point to derive an optimum chord and twist distribution.
For this reason, the input values need to be physically realistic and mutually consistent. If the requested thrust, power, RPM, inflow velocity, radius, airfoil data, etc. are outside the normal validity range of the method, the optimizer can produce unrealistic geometries, such as excessive chord or twist. This usually indicates that the design point is not compatible with the assumptions of the method, rather than a numerical issue in QBlade.
I have closed your other topic, since it is now redundant.
Best regards,
David
thanks David
