fastga_he.models.propulsion.components.propulsor.propeller.components.slipstream_delta_cm_alpha module

class fastga_he.models.propulsion.components.propulsor.propeller.components.slipstream_delta_cm_alpha.SlipstreamPropellerDeltaCMAlpha(**kwargs)

Bases: ExplicitComponent

Compute the increase in pitching moment about the quarter-chord point of the extended chord due to lift caused by the propeller slipstream at angle-of-attack [BV17]. cs_prime / cs is assumed to be one and we will neglect the contribution of the fuselage. Also, the formula seems to have a discontinuity @ delta_f = 30 degree (not the same sign). Figure 11 seems to suggest that the the first line of equation 22 should be <0 as is the second line, which is what we will use.

Store some bound methods so we can detect runtime overrides.

initialize()

Perform any one-time initialization run at instantiation.

setup()

Declare inputs and outputs.

Available attributes:

name pathname comm options

compute(inputs, outputs, discrete_inputs=None, discrete_outputs=None)

Compute outputs given inputs. The model is assumed to be in an unscaled state.

An inherited component may choose to either override this function or to define a compute_primal function.

Parameters:

• inputs (Vector) – Unscaled, dimensional input variables read via inputs[key].

• outputs (Vector) – Unscaled, dimensional output variables read via outputs[key].

• discrete_inputs (dict-like or None) – If not None, dict-like object containing discrete input values.

• discrete_outputs (dict-like or None) – If not None, dict-like object containing discrete output values.

compute_partials(inputs, partials, discrete_inputs=None)

Compute sub-jacobian parts. The model is assumed to be in an unscaled state.

Parameters:

• inputs (Vector) – Unscaled, dimensional input variables read via inputs[key].

• partials (Jacobian) – Sub-jac components written to partials[output_name, input_name]..

• discrete_inputs (dict or None) – If not None, dict containing discrete input values.