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Controlling N1 speeds

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unitedkingdom
Hi all,
On the real aircraft the computer controls the engines N1 speed to not exceed an N1 bug on the speed gauge. The speed bug is auto set according to conditions. So if you push the throttles to full, the N1 speed is restricted to the bug, and pulling the throttles back allows the engines to drop back as well. There is a feature in FSX that allows you to set the bug position
(>K:AP_N1_REF_SET) and a hold variable that will lock the N1 speeds to the ref speed. This looks like a way of doin this as you can say that if N1 speed exceeds the bug speed, then implement the hold. Point is the hold controls throttles so pulling the throttles back will not reduce the engine speed.
Anyone have any ideas how to simulate this?
cheers,
nick
 
As far as I know, the only way to do this is to fully manage N1 through your own code. This is what I did in the FeelThere Airbus Series: a custom PID controllers manages the throttle applied to the engines according to the thrust lever positions. It is not easy to develop, but it works great.

Eric
 
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