Stalling - Help & Advice
 

Hi,

I really could use some advice regarding Stalling and the fear of! I've stalled the plane (C152 Aerobat) in the past, no problem, apart from one ocassion where a control input put the plane into a spin. Since then, I just cannot get my head around it - i've built up an inexplicable fear of the stall and the associated unusual attitude that this is now becoming a blocker to my doing my test.

Any advice/help/words of wisdom. I need to get this done!

I was in the same situation as yourself when I did my stall recovery training. What helped me was that my instructor offered to give me a lesson dedicated to spinning. When I was comfortable recovering from spins, stalls were a piece of cake. It's a shame spinning isn't in the syllabus as I found it really helpful.

Best of luck!

Alex

Given your location I would suggest a trip to Kemble and do the stall/spin course at UH, this will definitely teach you that both are nothing to be frightened of if you know what to do, will teach you how to recover from and avoid both and ensure that you can stall without getting into a spin.
Edited to say that seeing you are still doing your licence, try and do this with your instructor, much of the posts below give reasonable guidance. As Ghengis says lower down, doubt if it is actually a spin being a Cessna, but if you do a spin lesson learning both that and spiral dive, see the difference and how to recover from both you should get over your fears.

I was struggling with it on revalidation my ppl recently. What helped me was when I was shown how gentle the recovery is in a 152. No need to shove the column forward just ease it to neutral and full power. That way you only lose 200 feet or so and it feels quite gentle. Get the instructor to show you a few. And don't go near the rudder when recovering!

Well that's an interesting piece of advice!

Practice some extreme slow flight, with the stall horn just screaming, and lots of power on. Just keep the plane balanced there. You will get the feel of the pitch forces very near the stall, and the required precision of control in roll and yaw. If it breaks in the stall while doing this, pull off the power, and recover normally. As you practice this you will realize that you can enter or recover that stall at will.

The 152's stall warning horn is particularly good for this, as it will produce an intensifying sound with the deeping approach to the stall.

As for the recovery with lots of altitude, what's the worst that can happen? You're pointed down, recovering form a dive - that's okay.....

The stall is nothing to be afraid of, especially in a simple aircraft such as a 152.

Lots of good advice here, some not-so-good. As pilotDAR says, with an instructor, try a bit of slow flight at a reasonable altitude. Get the feel of the aircraft and recognize the various signs and symptoms. Notably, reduced responsiveness of the controls, yaw and buffet. Try and fly on the 'edge ' of the stall warner and then make some control inputs noting how the stall warner reacts. Finally, do a clean stall and recovery with no power. To start with, you can do this with no control input during recovery other than elevator. Say to yourself "centrally forward" and force yourself not to use aileron. Note how you only need to pitch down to an attitude where the horizon is about half way up the windscreen; there is no need for frantic inputs and death defying dives. Get comfortable with this, lots. If a wing drops during the process, don't worry, just concentrate on getting the right attitude ("centrally forward") and, once the aircraft has gained flying 'speed' then you can sort out any wing drop that may have developed.

Once you are comfortable with this, you should progress on to making the stall recovery more efficient. This is done by introducing power at the appropriate point and, for finesse, using rudder to arrest any wing drop that is developing. However, never forget that the only way you are going to get out of a stall is to get the wings working again. This is done by ensuring they are both at angle angle of attack where they provide lift, ie from your bum up through your head -"centrally forward".

Finally, you are not alone, there are many pilots and instructors who are unnecessarily afraid of the slow speed regime. Yes, treat it with respect but that is all. It is only when you progress on to far more fanciful aircraft that the stall can lead to some interesting things.

Yep I was told leave the rudder alone as this can initiate a spin. Equally if a wing drops, nose down and then roll the wings level with the aileron.

Ah, one of my mastermind specialist subjects!


The stall occurs when one of two things happens - either flow separation on one or more of the wings, or the stick is fully back and the aeroplane held on the back of the drag curve. Either way, the aeroplane isn't fully controllable, and is losing a lot of height - neither of which are happy conditions.

One or more of the following may mark the stall:

- Wing rocking
- Wing drop
- Nose-down pitching motion
- Aeroplane held nose-up, usually with the yoke fully back.
- Very high rate of descent (this is pretty much universal)

In any aeroplane you are likely to ever get your hands on, the solution to all of these is absolutely the same.

(1) Move the stick forwards.

Don't do it sharply, don't go a long way, basically relax any back pressure, and bring the stick roughly to the middle.

That's it, the aeroplane is now flying again and under control. Technically, no other action is needed.


There is a second issue however, which is the loss of height, and if you manage to stall at low level, you particularly want to reduce that. Hence the second thing you ideally want to do

(2) Apply full throttle (and if you had it on, shove the carb heat knob back in).


Done reasonably promptly these will between them unstall the aeroplane, and minimise height loss. Then it's just a case of bringing the aeroplane back to a shallow climb, or level flight attitude (if in doubt, go for the climb) and once the aeroplane is level or climbing, bring power an pitch back to a normal flying condition.

There are four big things that you can do wrong.

(1) Not move the stick forward straight away
(2) Increase power before you move the stick forward, or fail to use full power.
(3) Try to pick up any wing drop BEFORE the wing is unstalled.
(4) Fail to keep the ball in the middle (do this with the rudder, and you don't actually need to look at the ball - you should be able to feel if it's out of balance by a sense of sideways movement).

That is basically it for ensuring your safety; after that, any other subtleties are subtleties about elegant flying and impressing instructors. But on those subtleties:-

- Don't push the stick forward to far or too fast, or you'll bunt and/or lose too much height still.
- Don't wait for recovery, do it as soon as you see or hear symptoms of the stall.
- Don't expect all aeroplanes,all the time, to pitch nose-down (especially at forwards CG conditions)
- If you had flaps on, raise them only in stages, at a good speed and safe height and whilst climbing.
- Remember that wing drop won't do you any harm, just take care not to try and raise the wing until the aeroplane is fully unstalled.


The stall is not dangerous, and the spin entirely avoidable. The ONLY thing likely to kill you is stalling very low (that is, below 500ft), and failing to take proper actions. In other words, it's only the height loss that is a problem.

I've spun C152 - and you have to try very hard to get one into it - I *suspect* that all you saw was a bit of wind drop, and perhaps what might have eventually become a spin if uncorrected (called the "incipient spin"). There are aeroplanes where this is something you need to be a little careful of, but not a C152.

G

taxistaxing, fair enough. I think what you are describing though is more of an unusual attitude recovery, which although includes stalls is not entirely relevant to the OP.

In the context of this thread I would say that a "recovery" is going to include a full power climb back to entry altitude, which will require a significant rudder input.

Flying in balance in the first place will most likely prevent wing drop and that too will require use of the rudder.

Also never forget that lift is still produced above the stall AoA!

EDIT: I just complained about nit picking in another thread and now I've just done it myself! Sorry, I know what you meant. :ok:

Ok. Would you say rudder only once the stall has been recovered? I.e. nose forward, power on, roll wings level and neutralise yaw once recovered and climb established? I was told no rudder initially and that nose down is the first reaction, although in practise the whole recovery sequence is obviously very quick.This was in the context of a ppl reval in a c152.
Apologies for hijack of the thread but seems relevant to the discussion!
Ta.

Rudder throughout, but ONLY to keep the aeroplane in balance (in other words no discernable sideforce and the ball in the middle), NOT to pick up a dropped wing.

G

If you think about it as soon as you apply a power change or a pitch change that effects airspeed you will need a rudder input. Personally I don't have a problem with using rudder to arrest a wing drop, but there is a fine line between that and picking a wing up, which you will see on Genghis' things you can do wrong list.

The idea of forward stick/ yoke and then rolling level is that you can't stall at 0g, and you can't bust your rolling g limit, but you can use full aileron to roll level as quickly as you can.

It's fine to say you won't use rudder when you are stalled, but for the sake of a PPL skills test, I don't think an examiner would want to see you delay adding full power, because that is part of the "standard" stall recovery. As soon as you add power you will need a rudder input.

Thanks for clarifying chaps. OP, apologies for the misinformation.

One thing and one thing only causes an aircraft/aerofoil to stall: increasing the angle of attack beyond the critical.
Recovery is effected by reducing the angle of attack below the critical.
This is normally done using the elevators.
Adding power as you move the elevators down will help the wing unstall more quickly.
Once the aerofoil (wing) is unstalled you can use the flight controls normally - rolling wings level and raising the nose at this point will prevent further height loss.

Not much else is important.

One other thing to help you gain confidence: you should find an instructor who's happy to demonstrate and then let you fly what's sometimes called a "falling leaf" stall (and sometimes isn't). Whatever it's called, the goal is to HOLD the aircraft fully stalled (yoke/stick fully back) for an extended time, GENTLY using the rudder to keep wings level. You can fly like this for as long as your altitude will let you - the descent rate is high (of course) but you are still flying. When you've had enough, yoke forward and fly out of it. The plane will bob up and down as the wings "try" to unstall themselves.

And definitely +1 for doing some basic spin training.

go to Alan Cassidy and he'll sort you out. I'll refund you if not.

That has been deemed bad practise and a training com has been put out to stop that crap.

Lots of sensible suggestions.

Maybe a pre-aerobatic session with one of the many excellent qualified pilots we have in the UK? Once you've got used to recovering an aircraft from any attitude/airspeed, stalling won't seem a problem any more!

If you've developed a distaste or "fear" of stalling after a wing drop, it's possible that you're more sensitive to low or negative 'g' than the average pilot - it might be worth mentioning that to your instructor(s) and see what they say...

3. Questions,

1.
Is a "falling leaf" really a stalled condition, and if not what signifies advancing from a falling leaf stall to a full stall condition? and will a falling leaf always progress to a fully developed stall or will you just basically flutter all the way down if inputs are not changed.

2. Can you go directly from falling leaf to incipient spin?

3. "Back of the drag curve" do the flaps have to be deployed to reach the Back of the drag curve point?

Thanks