When do you advance props

[towhook]

I believe it should be done only after the governor has stopped controlling the prop. This is quiet and the most professional way in my eyes. Why surge the RPM while in a descent to landing?

 

[mshunter]

but vs butt

Gramar Nahzi!

 

[Stomp16]

This would be easier to discuss in person rather than trying to write it out. I don't think I am getting across what I am trying to convey.

We are not having to add a bunch of power because props were advanced. In a no wind situation, props go full at the abeam point. This is what has been taught and what most people do. It becomes routine....

Now take a day with 30kts of tailwind in the downwind. The throttle is pulled wayyyy back and your doing your normal pattern with concern to distance and speed. Out of habit of putting prop full at the abeam point, the same thing happens with 30kts of tailwind (if the pilot isn't thinking ahead). Now, this does not give an audible change or even much of a change in the rpms because the throttle is almost fully retarded. Now, downwind to base looks fine, correction is in. Then, base to final that 30kts of headwind is off the nose with the throttle retarded and the prop full forward. "All of a sudden" they don't have enough power to make the runway because of the change in wind direction. The first thing that happens with 99% of people is the throttle is first to go back in. 8-10inches of mp is added and with that comes the redline of the rpms.

If you set the prop at 2500rpms with the throttle retarded and leave it there until short final (as opposed to going full at abeam), if you have to add power, the rpms will not go above 25inches because that's where you left it. Therefore, the change in pitch and increase in noise will not happen which makes it a more comfortable ride for everyone. Does this make sense?

Not quite sure what you mean?

Bottom line (the way I fly it) when we got a strong easterly at SZP, and I am in anything, I turn my base downwind abeam the touch down point. I still use the same amount of bank as normal days, and let the excessive ground speed make up for the rest. I usually don't have to add any power get to the runway, and adjust flap usage to make sure my glide path looks right. I am not saying anyones technique is better or worse, I am just pointing out that if you had to add a bunch of power to get to the runway because you advanced props, something should have been changed about the approach.

I am of the school of thought to have it ready when I need it, and I don't want any config. changes when it's time to do a go around, or on short final. Concentrate on making the landing, and leave everything else alone. If it wasn't configured on short final, go around and try again. The last thing I want to do, is throw the props forward, mix.'s fwd., hit a bump, and accidently knock one of the levers back, like the mixture or prop, and create a situation that was pilot induced, and totally avoidable.

Bottom line is, it does not matter how you get there, it just matters that you do.

 

[mshunter]

This would be easier to discuss in person rather than trying to write it out. I don't think I am getting across what I am trying to convey.

We are not having to add a bunch of power because props were advanced. In a no wind situation, props go full at the abeam point. This is what has been taught and what most people do. It becomes routine....

Now take a day with 30kts of tailwind in the downwind. The throttle is pulled wayyyy back and your doing your normal pattern with concern to distance and speed. Out of habit of putting prop full at the abeam point, the same thing happens with 30kts of tailwind (if the pilot isn't thinking ahead). Now, this does not give an audible change or even much of a change in the rpms because the throttle is almost fully retarded. Now, downwind to base looks fine, correction is in. Then, base to final that 30kts of headwind is off the nose with the throttle retarded and the prop full forward. "All of a sudden" they don't have enough power to make the runway because of the change in wind direction. The first thing that happens with 99% of people is the throttle is first to go back in. 8-10inches of mp is added and with that comes the redline of the rpms.

If you set the prop at 25inches with the throttle retarded and leave it there until short final (as opposed to going full at abeam), if you have to add power, the rpms will not go above 25inches because that's where you left it. Therefore, the change in pitch and increase in noise will not happen which makes it a more comfortable ride for everyone. Does this make sense?

Much more sense. but, for me, sometimes you have to s-l-o-w i-t d-o-w-n a little. And I am assuming that you are talking about 25hundred rpm rather than the prop at 25 inches?

 

[Stomp16]

Much more sense. but, for me, sometimes you have to s-l-o-w i-t d-o-w-n a little. And I am assuming that you are talking about 25hundred rpm rather than the prop at 25 inches?

Yes, that is what I meant and I fixed it. I agree with you that people have to slow it down and think ahead. The sad truth though, not everybody does, hence the reason for the discussion.