A little engine help
 

Hey All. I have been working through some information today about the Jetstreem for a research project on small aircraft used in a 3rd world country. Not so sure any jetstreems are but i have a few questions about the engines.

Why does the left engine turn clockwise and the right anticlockwise, and why is the reduction gear higher on the left that the right?

Sure most multi props are like this? but it would be of help if anyone can offer some input on this matter.

Thanks for any help...

The "Jetstream" engines as on a lot of Aircraft turn in opposite directions to counteract the effects of torque, as if the both turned one way there would be a tendency for the aircraft to roll. As for the gearing I do not know.

I'm not familiar with this type of aircraft but presumably, the engines (Astazou?) actually turn in the same direction; only the props turn in opposite directions.

The gearing system needs to be arranged differently to allow a rotational direction change.

Better aircraft handling during single engine operation.

Here's a bit of visual aid about what happens when both props turn the same direction.

However, if both props turn inboard, the problem of "critical engine" is null and void.

There is also the paddle wheel effect, although not very important. With the engines rotating in the same direction the aircraft will 'paddle' itself sideways as it goes along. A small problem to consider when using dead reakoning navigation.