180hp Cessna approach power settings

[Douglas]

Not to disagree, because there are days that 1700 RPM could work all the way down to the ground, but IMO there are too many factors to make 1700 RPM something that can be relied on every-time. Maybe you are not saying that and I am miss reading.
I agree it is a good ball park number but factors like wind and size of the traffic pattern will change the coveted set-it-and-forget-it power setting, every time.

 

[The Gardener]

Why would I put sarcasm? Sending a student for a checkride where there is a potential for partial panel NDB work and he hasn't done them for a couple of months? A bit irresponsible on the part of the instructor.

Either teach the aplicant to competency or placard the thing.

I did do a PP NDB on my checkride, but since then I don't think I have done a single one. None of the A/C I teach in have NDB's not to mention the lack of NDB's in our hood.

 

[sdfcvoh]

Not to disagree, because there are days that 1700 RPM could work all the way down to the ground, but IMO there are too many factors to make 1700 RPM something that can be relied on every-time. Maybe you are not saying that and I am miss reading.
I agree it is a good ball park number but factors like wind and size of the traffic pattern will change the coveted set-it-and-forget-it power setting, every time.

You are absolutely correct. There can always be varying factors if the weather is crazy or tower sends you on a cross country pattern:banghead:.

But, otherwise I would completely recommend using it as a baseline for approach. Its is SO much easier than different settings on each leg of the approach.

 

[TXaviator]

...by the responses in this thread, im guessing that my personal technique of full throttle (or just under redline) until i see the runway would be frowned upon??


see the runway, hit the brakes, land! ta-da!

 

[germb747]

but it's a different area, different airplane, and unfamiliar examiner; I need all the help I can get and it feels like I'm just setting myself up for a failure

I have to ask why you're doing that to yourself? Wouldn't you want to stack the deck in your favor as much as possible? Murphy's law says there will be things that happen on checkrides that you can't control, but this is something you definitely can control. Go get some practice in the same airplane and area before taking your checkride, and yes be proficient at every piece of equipment installed. Just my humble advice, take it for what it's worth.

 

[drew09]

2000 RPM will give you just about 90kts

 

[sdfcvoh]

...by the responses in this thread, im guessing that my personal technique of full throttle (or just under redline) until i see the runway would be frowned upon??


See the runway, hit the brakes, land! Ta-da!

airbrakes!!!!!!!!!!!!!! :d

 

[sdfcvoh]

2000 RPM will give you just about 90kts

Just to add a bit since I was rambling about 1700 RPM and such....

2000 RPM without flaps will (generally) give you 90kts level flight. Nice and stabilized for the downwind.
1700 with 10˚ is going to let you pitch for 80kts at 400-500 fpm descent.
1700 with 20˚ is going to let you pitch for 70kts at 400-500 fpm descent.
1700 with 30˚ will let you pitch for 60kts at 400-500 fpm descent.
Remove power before flare. "Squeak."

 

[Douglas]

my personal technique of full throttle (or just under redline) until i see the runway would be frowned upon??

:laff:
I did do a practice ILS once in an archer at full throttle all the way down the GS, just to see if i could do it.
very very sloppy.....and yes we used the WHOLE runway.

not recommended.

 

[matt152]

That would depend on how your 172 got the excess HP. If it originally had an O-320 in it and got an O-360 installed, that would change CG.

:yeahthat: It is a 1968 C-172 with the 180HP conversion.

 

[TXaviator]

:laff:
I did do a practice ILS once in an archer at full throttle all the way down the GS, just to see if i could do it.
very very sloppy.....and yes we used the WHOLE runway.

not recommended.

yeah i mean obviously this technique wont work with something faster or less draggy... but come on, a 172?

full power all the way down, break out/DH, idle power, full forward slip (if needed), throw in full flaps (if needed....probably not), land.

simple!

 

[drew09]

Just to add a bit since I was rambling about 1700 RPM and such....

2000 RPM without flaps will (generally) give you 90kts level flight. Nice and stabilized for the downwind.
1700 with 10˚ is going to let you pitch for 80kts at 400-500 fpm descent.
1700 with 20˚ is going to let you pitch for 70kts at 400-500 fpm descent.
1700 with 30˚ will let you pitch for 60kts at 400-500 fpm descent.
Remove power before flare. "Squeak."

there we go, thats perfect!

:rawk:

 

[P210pilot]

yeah i mean obviously this technique wont work with something faster or less draggy... but come on, a 172?

full power all the way down, break out/DH, idle power, full forward slip (if needed), throw in full flaps (if needed....probably not), land.

simple!

Done it...works fine. Not for students though.

When you're on final at TEB and they are hounding you about speed. I fire wall it and "make it so." Break out, idle power, roll in pitch up, full flaps....1st turn off.:yeahthat:

 

[TXaviator]

Done it...works fine. Not for students though.

When you're on final at TEB and they are hounding you about speed. I fire wall it and "make it so." Break out, idle power, roll in pitch up, full flaps....1st turn off.:yeahthat:

bingo! im no stranger to working around BUSY airspace in my MIGHTY 172...

i do everything i can to create as little disruption as possible for the big and fast guys....

 

[matt152]

i do everything i can to create as little disruption as possible for the big and fast guys....

I derive great fun from watching a C-5 hold short for my instrument students who are flying the ILS at 90 knots 5 miles out.

Yeah, I'm a trouble-maker.

 

[Roger, Roger]

I derive great fun from watching a C-5 hold short for my instrument students who are flying the ILS at 90 knots 5 miles out.

Yeah, I'm a trouble-maker.

On the same lines...our controllers are used to our students flying 8 miles from the marker on the PT and generally taking forever to shoot an ILS. I messed up their sequencing one day (I was burning up "employee incentive time") by making a 90/270 PT at the marker. They vectored me back to final...:banghead: