If the plates are closed still further, the backwash of the propeller slipstream against them overcomes the ‘ahead’, thrust of the propeller.
Ukuba iipleyiti zivalwe ngokuqhubekekayo, umsinga otsala ngomva wesiqhubi senqanawa kumsinga otyibilikayo ochaseneyo nazo nokukhawulelana nokuya phambili, kokutyhala kwesiqhubi.