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Correct throttle RPM order?


truebrit

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I was watching this video from Reflected Simulations where he says it should always be throttle down then rpm, rpm up then throttle. In this tutorial from Eagle Dynamics he does it the other way. I asked Reflected Simulations in the comments about this, he said "They're doing it incorrectly then. It's always: throttle down, then RPM down // RPM up then throttle up, otherwise you risk over boosting the engine. It's true for all aircraft, not just the Mossie."

 

Who is right, and is the possible damage modelled?

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6 hours ago, Nealius said:

"Prop on top" is the rule of thumb. 

 

When adding power: prop pitch first, then throttle.

When reducing power: throttle first, then prop pitch.

 

This is how I was taught.

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18 hours ago, Nealius said:

"Prop on top" is the rule of thumb. 

 

When adding power: prop pitch first, then throttle.

When reducing power: throttle first, then prop pitch.

Indeed.  This is also mentionned by Greg in this video.

 

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In planes with automatic boost regulator, pilot can overboost engine. So when pilot pulls rpm down boost regulator will maintain map, and this is dangerous for engine. But this is not alwayes the case. Above critical alt pulling rpm down will result in drop of map. So in some cases pulling rpm w/o touching throttle is safe.

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Life grafspee said, above a certain altitude you'll need to push the throttle past the pitch lever to maintain manifold pressure, but in those situations I still follow the "prop on top" rule when making power adjustments just for the sake of muscle memory and keeping the good habit. 

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