De acordo com este documento da NASA , o elevador após a hélice estar mais alto e é usado propositalmente para criar mais sustentação.
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Wing-mounted propulsion systems have significant effects on the wing
aerodynamic characteristics, and these effects are more pronounced
when the highlift components are deployed. Various aerodynamic
components contribute to the rise of these effects. Some of these
effects are external to the wing performance and affect the
measurement of the aerodynamic characteristics of the combined
assembly. Examples of these effects are the propeller thrust, the
location of the thrust line, tile size and location of the exhaust
nozzle, and the thrust from the exhaust nozzle alone. Another group of
effects are pure aerodynamic effects, such as the propeller
slipstream and the flow past the nacelle and nacelle attachments.
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Results indicate that the lift coefficient of the powered wing could
be increased by the propeller slipstream when the rotational speed
(disk loading) was increased and high-lift devices were incorporated.
É também afirmado que o escape do turboélice também pode criar sustentação.
Por exemplo:
Um exaustor de um turboélice "PT6A-67" de turbina livre de um Conair Firecat convertido não gera nenhum aumento.
Mas um escape do turboélice YS-11 da Rolls-Royce RB.53 Dart, que está quase na asa, pode gerar elevação e aceleração adicionais.