Full Of Eastern Promise.....
Full Of Eastern Promise.....
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all twin engine propeller driven aircraft hve a critical engine. Its related to the down going blade on the engine and the distance away from the longitudinal axis, creating a bigger turning moment Work out the direction of the prop rotation. The engine with the down going prop furthest away from the axis is the least critical engine, less moment, to counteract after an engine failure. Hope this helps.
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Critical engine for handling/control reasons in conventional multi types (ie both props rotate in the same direction) is due to the laterally offset thrust line caused by a number of factors.
The thrust line for each engine is therefore offset in the same direction causing L & R props to have a difference in thrust line position relative to the longitudinal axis. One engine will leave a greater effect than the other(s) if it fails so it is the critical engine.
Multi types that have counter-rotating props won't have a critical since the L & R thrust lines will be displaced laterally in opposite directions so neither engine will leave a greater yawing moment if it fails - so no critical engine.
Push-pull types eg Cessna 337 also don't have a critical engine for handling reasons but may have a more critical engine for performance reasons.
The thrust line for each engine is therefore offset in the same direction causing L & R props to have a difference in thrust line position relative to the longitudinal axis. One engine will leave a greater effect than the other(s) if it fails so it is the critical engine.
Multi types that have counter-rotating props won't have a critical since the L & R thrust lines will be displaced laterally in opposite directions so neither engine will leave a greater yawing moment if it fails - so no critical engine.
Push-pull types eg Cessna 337 also don't have a critical engine for handling reasons but may have a more critical engine for performance reasons.
