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Sim Flight Training: PPL: Part 2 of 7 (Read 1161 times)
Nov 18th, 2007 at 9:36am

Brett_Henderson   Offline
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I'm putting the original "syllabus" back up for reference...

Quote:
SimV Private Pilot:

1-Plan a flight of 50nm or more, accounting for winds aloft and their affect on heading and ground-speed. Calculate the minimum fuel needed (including reserves) and the maximum payload at that fuel level.

2-Fly the planned flight holding heading (+/- 10 degrees) and altitude (+/- 100 feet); enter the traffic pattern safely; execute a touch-and-go and fly one complete lap around the pattern and then execute a full-stop, short-field landing.

3-Execute a short-field takeoff.

4-Execute a constant-airspeed, climbing turn.

5-Track a VOR radial and fly to an NDB.

6-Execute a 360 degree, steep turn (greater than 45 degrees bank) holding altitude +/- 100 feet and rolling out on heading +/- 10 degrees.

7-Execute a no-flap landing.


Part 2 will cover a lot of flying procedures. We can touch on the ABC-123-step-by-step stuff..  like approaching an airport, and pattern entry, and flying a pattern... stabilizing an approach.. and so on.

Holding headings an altitudes are techniques that you have to practice on your own. Little tips and tricks  (especially sim-specific tips) will be a big part of this thread.

Flying a nice, precise pattern in a crosswind (or any wind because it will always be a crosswind for at least two-legs of a pattern), will qualify for ground reference maneuvers (keeping your plane where you want it to be, despite the winds).. and completing a good touch-n-go with a crosswind is a good indicator that you can control the plane.

The biggest skill we can get out of this part; is to learn to keep the winds in the back of our mind. Not even  giving it much thought when you adjust your pattern-leg headings for the wind, or roll right into a perfect crab on final (groping for at the ILS needles) will free up your focus... A focus you'll need when flying by instrument. The difference between being able to fly a hold, flawlessly, so you can tend to all the other tasks while trying to get a plane on the ground in 1-mile visibility, can make the difference between a confident instrument pilot, and one who's a hazard in the air  Wink   You'll know what I'm talking about when we get into genuine instrument training...
 
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Reply #1 - Nov 19th, 2007 at 8:51am

Brett_Henderson   Offline
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OK... I think the most applicable concept to get out of Part 2, is situational awareness. Where you are; where you want to be;  how what's around you will affect this; and what to do about it.

On a VFR takeoff, you're expected to hold runway centerline until at least 500agl. If, at a controlled field, you've been, "cleared for takeoff on cousre". ..this means.. stay on runway centerline and at 500agl you can turn to the course/heading you requested when talking to ground. Sometimes you'll hear something like this, "cleared for takeoff, fly runway heading until past the river, then on course".. and it means just what it says.

This doesn't sound complicated, but when there's any kind of wind, it gets complicated. Staying on runway centerline is no big deal right after lift-off when all the ground references are near and familiar... but as soon as you leave the immediate proximity of the runway, you'd be surprised how quickly you can drift. My method, is to lower the nose a little at about 200agl (looking for traffic); pick a landmark out toward the horizon, and reference it during the climb to stay on runway centerline. This stuff can be critical, and best case scenario will be the tower guy scolding you... worst case is that you can drift over toward traffic entering on an extended downwind leg.. and even WORSE, is all the conflict potential at a busy airport with parallel, active runways, and a pattern full of student pilots... Shocked

Equally important, along these techniques, is to enter a crowded pattern safley, and fly each leg accurately......
 
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Reply #2 - Nov 20th, 2007 at 6:59pm

Brett_Henderson   Offline
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There are a couple camps when it comes to initial climb-out speed. Mathematically they're almost equal, and the airport environment, prevailing wind and surrounding area has the last say.

Vy (~75kias for C172@sea-level)  and   Vx (~60kias for a C172@sea-level)    Vx is the best climb angle... Vy is the best rate of climb. Vx gets you the most altitude for a distance covered.. Vy gets you the most altitude over a period of time.

Best argument for Vx is simply that it will have you at the highest altitude by the time you're clearing the airport area. Best argument for Vy is that it puts distance between you and the ground more quickly.

The mathematical equalizers are that by the time you pitch for best glide after engine failure, you'd be at the same altitude, anyway (unless of course it's a short-field takeoff and the flaps are deployed)..

The hard and fast rule; that you can't make it back to the airport with an engine failure right after takeoff, is mostly true... However (off the record), if it's a 5,000 runway and you took off into a significant headwind... you very well could make it back. And if there are more than just one runway, there are other possibilities, including the likelihood of a larger clearing at the airport, than anywhere out in front of you. These are situational things, and only experience can put you in a position to make those decisions.

For the sake of simming.. all climb-outs should be done at Vy...  EXCEPT for short-field take-offs with flaps deployed where Vx is called for. Just remember to pitch for Vy after clearing the obstacle BEFORE retracting the flaps....
« Last Edit: Nov 20th, 2007 at 9:07pm by Brett_Henderson »  
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Reply #3 - Nov 20th, 2007 at 8:00pm

Mobius   Offline
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Brett_Henderson wrote on Nov 20th, 2007 at 6:59pm:
Vx (~75kias for C172@sea-level)  and   Vy (~60kias for a C172@sea-level)

Hey Brett, I think you have you're Vx and Vy switched.  Vx ~60 kias and Vy ~75kias. Wink
 

...
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Reply #4 - Nov 20th, 2007 at 9:06pm

Brett_Henderson   Offline
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LOL.. you're right.. thanks  Smiley
 
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Reply #5 - Nov 21st, 2007 at 2:12pm

RitterKreuz   Offline
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hey brett... are you conducting actual online sim training in multiplayer shared aircraft for sim-pilots?

if so thats great!

sounds like something i might like to help out with now and again.  Cool

One addition... i have tried this before, but we quickly discovered that our keyboard and joystick assignments were completely different, it took a lot of time to sort that out hahaha so watch out for that!  Grin
 
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Reply #6 - Nov 21st, 2007 at 2:43pm

Brett_Henderson   Offline
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Hi RitterKreuz..   Smiley

I've already done several, on-line, shared-cockpit check-rides and lessons...  with everyone form a 310 owner, to our friend Alrot and our language barrier  Smiley

By the time I'm finished with this series, I'm hoping very much to start giving check-rides.. or giving some lessons... and who knows.. this might even catch on. Group seesions/lessons would be great too...

There's no way for me to handle it alone though.. So each and every PPL check-ride passer, is qualified to give a check-ride... the idea being that this mind-set and approach to simming might be contagious   Smiley

Group flights and brain-storming sessions will be fun, too. Say, six of us in three planes flying blind IMC up to a resort island.. trading tips and pointers and helping each other through the rigors of genuine IMC instrument flight..  Control of the plane can be passed back and forth and we can switch planes, change co-pilots after each leg.

I think, by the time we get to actual instrument training, live sessions teach much better than reading a post and doing your own research..

We'll see where this goes..  I'm going to schedule an "instructors" MP session soon.. so we can all get on the same page (your attendence is compulsary  Wink  )
 
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Reply #7 - Nov 23rd, 2007 at 2:17pm

Brett_Henderson   Offline
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Now......  As soon as you're above pattern altitude, it's OK to pitch for a cruise climb. Anywere from 85kias to 100kias, depending on how much of hurry you're in to reach cruise altitude..

During a full power climb, you need not pay much attention to mixture, until you're above 3000msl. At that point, it's good to just lean it a tad (you'll hear the power come back up). In a real C172, you want full rich during full-power, because leaning causes the engine to run hot, but as you exceed 3000msl, full rich means less than full power. The "real" way to gauge this as you climb, is by the EGT gauge. MSFS EGT gauges are slow to respond and not very realistic. Just use the fuel-flow gauge (keep it peaked) during the climb.

Next topic is VFR cruising altitudes. I'll leave it to a contributor to fill us in  Wink

As soon as that's sorted out, we'll get into trimming for cruise, holding heading and altitude...
« Last Edit: Feb 7th, 2008 at 8:57am by Brett_Henderson »  
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Reply #8 - Nov 26th, 2007 at 7:20am

Brett_Henderson   Offline
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Alrighty then... I'll sort it out.

VFR cruising altitudes begin above 3000agl ( NOT msl, as many airports have elevations at or above 3000msl).

If your magnetic course (not heading, but actual ground track) is anywhere from 000 to 179, your VFR cruising altitude would be any odd-numbered thousand plus 500 (3500, 5500, 7500, etc.)

If your magnetic course (not heading, but actual ground track) is anywhere from 180 to 359, your VFR cruising altitude would be any even-numbered thousand plus 500 (4500, 6500, 8500, etc.)

The theory is to keep people from flying "at" each other. Any airplane at the same altitdue as you, will be flying in similar direction.

The old trick for remembering, is that if you're flying the "bigger" numbers (westerly) it's even+500. The smaller numbers (easterly) are odd+500....  Bigger=Even    Smaller=Odd ...
 
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Reply #9 - Nov 29th, 2007 at 7:50am

Brett_Henderson   Offline
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Trimming at cruise altitude and make the plane "happy".....

There's and old joke:  How long does it take to trim a Cessna 172 ?   ...  "About 20 hours"  Cheesy


Meaning, it's more about experience than method. The traditional way to teach trimming is: Pitch / Power / Trim.  When you near your desired altitude, pitch to stop the climb. As the airspeed comes up, reduce to cruise power. When the airspeed equals what you'd expect for that power-setting and altitude, trim  out the yoke pressure. In theory, that works.. but by the time you lean for cruise and the airspeed finally does settle, you'll be trimming a couple more times.

Quick note on leaning for cruise in MSFS... Since most EGT gauges are unrealistic, we'll use  fuel-flow. Lean until the flow peaks and then lean just a tad more. That gives you reasonably accurate fuel consumption.  In a real C172, you lean slowly until the EGT peaks and then richen two-notches. If you have no EGT gauge (or you don't trust it).. just lean EVER so slowly until there's a slight RPM drop.. then richen slightly. Do this slowly (and make sure there's a field nearby), because passengers don't like it when the engine sputters in flight  Wink

After a while, you get familiar with your airplane... and this is true for MSFS, too. When I'm flying a real C172, I can trim for cruise pretty quickly....  Just a whip or two on the trim wheel; a quick power reduction and an instinctive mixture setting and the plane will settle in nicely  Cool
 
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Reply #10 - Nov 30th, 2007 at 10:10am

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Yes, I generally lean by RPM indication, especially in MSFS... my time in a real C172 with an EGT showed me that generally the tach jibes with what the EGT is telling you. A fuel flow meter is best, of course...

In the Champ I was flying recently, which has no mixture control, a power reduction (to a setting which varied slightly with altitude) is used, the target being a distinctive vibration. Yeah... old-school, but it works. This yields best fuel economy/airspeed ratio in that plane... I found that I'd lose about 5 mph indicated, maybe a bit more. In a plane that won't go past 100 mph unless you dive it, that's not a big deal;D

But that points out what is obvious for any aircraft: throttle back a little and you will save fuel without a major sacrifice of time. My other observation with various C172s in RL was that the handbook's throttle setting/altitude/fuel burn figures were fairly accurate,  so often the choice of altitude would make a  big impact on fuel burn-to-airspeed . For long legs, I try to go with the altitude and power setting that hits the target where the airspeed and fuel burn curves intersect, if you know what I mean. Climbing costs a little fuel, but if you plan your descent right, you'll get some of that back.

Off the top of my head (been a while since I made a long haul in a Skyhawk), the best altitude is not anywhere near service ceiling- 7000-8000 feet, just a little more than halfway. The best throttle setting for that altitude escapes me at the moment, but it's about halfway between "really gotta get there" and "I'm lost and need to conserve fuel while I circle". Grin Leaning should follow from there.

As for trim: less is more. In a Cessna, definitely trim off pressure-  do not try to adjust pitch initially with trim, unless you really want a roller-coaster flight profile. Grin
 

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Reply #11 - Dec 1st, 2007 at 2:24pm

Brett_Henderson   Offline
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Every plane is different.. even C172s of the same model/year... and especially as they and their engines "age" and develop their own personalities. Throw in that the gauges, even tachometers, have built-in errors and flying a normally-aspirated, piston airplane becomes somewhat of an art-form  Smiley

Constant-speed props give the pilot more control, but even that has gray areas. A given MP/RPM doesn't always have a predictable, prop-pitch-angle and correspondingy predicatable true airspeed  Roll Eyes. If one or more of the valves are aging ahead of schedule, there's a difference in the amount of torque that finds its way to the propellor; hence a different prop-pitch and different thrust.

So.. flying the Champ from sea-level, up to an airfield at 5,000msl is tricky ?

ANYway.... Once happy and trimmed for level flight, we need to hold that altitude and follow our course..

That's the next post (input encouraged  Wink  )
 
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Reply #12 - Dec 1st, 2007 at 8:00pm

beaky   Offline
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Brett_Henderson wrote on Dec 1st, 2007 at 2:24pm:
So.. flying the Champ from sea-level, up to an airfield at 5,000msl is tricky ?


Digressing again, but this is interesting:
The mixture is fixed on the old "A" model Stromberg carb... but I had it up to 6,500 (ish) and it didn't seem to mind much. Very standard temp/dewpoint conditions, mind you... what's curious is that this fixed-mixture Champ has a service ceiling of 13,000. You could use most of your fuel getting up there... but finding lift is an important part of a Champ driver's job...  ;d
 

...
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Reply #13 - Dec 2nd, 2007 at 9:51am

Brett_Henderson   Offline
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Hardly a digression  Smiley ..  more valuable input...
Got me to thinking too. If I ever get around flying our Champ, I'll be picking your brain.. Last time I was up at KMRT to take a look at it.. all I got was a shot of it taxiing out...

...


Next time up there, I'll get better photos (hopefully from inside  Smiley )

I don't think I can coax a 172 up near 13,000msl without leaning. And even if I could I'd be worried about plug fouling. Which prompts me to ask; How do you clear a sputtering magneto in a Champ. And if you did have to take-off from a 7,000msl airport.. umm.. can you ?

Anyway.. this is all, topic relative, good discussion. Good stuff for pilots and aspiring pilots to kick around. You're very likely to pick up that little tibit of life-saving knowledge, when you sit in on a pilot's gab-fest  Cool
 
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Reply #14 - Dec 2nd, 2007 at 11:13am

beaky   Offline
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Brett_Henderson wrote on Dec 2nd, 2007 at 9:51am:
Hardly a digression  Smiley .. 
I don't think I can coax a 172 up near 13,000msl without leaning. And even if I could I'd be worried about plug fouling. Which prompts me to ask; How do you clear a sputtering magneto in a Champ. And if you did have to take-off from a 7,000msl airport.. umm.. can you ?


This is a very good question, which I considered but didn't ask about, and in fact, neither Bob nor anyone else offered any advice on how to deal with fouling. Never experienced any, either... which is certainly not the case with all the controllable-mixture Lycomings I've flown behind. Go figure.

It's possible that the way the timing is set helps prevent that- I do know that in order to make it easier to hand-prop, the spark was advanced a bit on that one. But that won't help much if you're running very rich on a regular basis... some Champs have a "B" type carb installed, with mixture control... maybe that's the only option for high-elevation  ops.

But maybe owners of fixed-mixture carb-equipped Champs who operate in the mountains or wherever keep it set a bit on the lean side... I dunno.

As for taking off at 7000 feet in "my" Champ, the normal takeoff roll and distance-to-clear is so short, I think it would take a very short strip with very tall trees all around to make me reconsider. I did fly it on some rather high-DA days, and the difference, near sea level, didn't seem quite so pronounced as with a loaded Skyhawk on a hot day. Must have something to do with the thrust-to-weight-to wing loading ratio... it may have a puny engine, but it's a very light airplane, with a very efficient wing, all things considered.

That's a nice Champ, BTW... the Army trainer paint had me thinking "Stinson 10" at first, but obviously it isn't... by all means, get some time in it while it's still flying, especially if you find yourself sitting around thinking "I should get a couple of hours in this weekend just to stay fresh", or "I need something new to do in a plane". The fun-to-cost ratio is extremely favorable, and it will keep you in touch with your "inner stick-and-rudder pilot", because getting acquainted with it is definitely a challenge. Grin
 

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