Twin Engine Aircrafts

Twin Engine Aircrafts

LIGHT TWINS

Review

The vast majority of what we have studied is serviceable for twin engine planes :

Controllability

A light twin engine plane behaves similar as a light  single engine plane. One of the differences is that when we have an engine fail in a single engine  plane we  only have one option, However in a twin engine planes we have more options.
As we know an engine failure can occur for three reasons : problem with the fuel, electric or air

In a single engine plane once we have an engine failure, we fly at the maximun glidding speed ,  then search a suitable field for landing , and then try to restart the engine. In a twin engine plane it is a bit different because , the twin engine planes are certified to keep certain altitude.
The first effect in case of engine failure in a twin engine plane is a yaw 




So what we have to do first is to apply the rudder pedal to balance that yaw moment

Then as we can see on the picture , one engine in running and the other not, so the lift in one wing is higher than the other. That leads in a roll , so we have to use our alirons to keep the plane straight.

Sum up : In a twin engine to have the engine under controlled we have to use the rudder ( dead engine dead foot, or feet the ball , as we can see in the picture bellow).

Critical Engine

It is the engine that when fails , affects in the most negative way to the airplanes performances .



The critical engine is the one that  the yaw when it fails , will sum up to the torque of the engine. 
For example : If the blades goes to the right the torque goes to the left . If the left engine fails the yaw that it provoques adds to the torque, so the total yaw is higher. Which means that when blades goes to the right , the critical engine is the left one. ( blades to the left, critical engine to the right).


 

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