its very much likely that a lawyer comes to know about the crime done by his client.
isn't if someone knows of a crime and doesn't disclosed is also equally guilty as the culprit.
(a)Propeller slippage
(b)An area of low pressure behind the propeller
(c)An area of decreased pressure immediately in front of the pressure blades
(d)The angle of relative wind and rotational velocity wind and rotational velocity of the propeller