Mailing List lml@lancaironline.net Message #49109
From: Luke Alcorn <lalcorn@natca.net>
Sender: <marv@lancaironline.net>
Subject: Re: Stalls [LML]
Date: Mon, 06 Oct 2008 22:29:09 -0400
To: <lml@lancaironline.net>

I will not disagree with your statements.  I am only posing questions to make people think.  I can refute and support every claim that you stated.  The problem is I read emails where people are talking in absolutes.  There are no absolutes in aviation. 

 

I dodge turkey vultures quite frequently in Florida, in a helicopter at low altitude, and every single time for the past 10 years, they dive away.  When you say low altitude, what is low, 100, 50, 1000ft?  Not saying they can not climb, maybe they did not read the documented observation you speak of.  I’ve not personally seen a bird climb out of the way of rapidly approaching aircraft.  I’ve witnessed them fold their wings and dive like a missile.  I don’t have to ask Bill, I avoid them every time I fly.  Now in a helicopter, I can roll much faster than climb, so we bank out of the way, but some pilots do not like to bank over 30 degrees, so they instinctively climb.  Lancair’s can climb remarkably faster than any bird.  If you want to descend, keep on doing what you do.

 

Tell the pilot of a bonanza I saw, was coming over the threshold, controller told him to go around because the controller saw that his gear was not down at the last minute.  When the pilot applied power, the nose pitched up, tail hit the runway and the aircraft cart wheeled and blew up.  Unfortunately, you can’t ask him, because he’s dead, and I watched it happen from 100 yards away as I was waiting to take the runway.

 

Wind shear, I agree completely yet you state is so simply and it is not.  Does everyone keep their speed up and have a good grasp of the weather pattern and winds around them?  Hence why we have accidents and that is all I am trying to say. 

 

Speaking in absolutes as though every pilot knows how to react to every situation is simply not true.  We all learn through mistakes, if we make it.  I want to express that saying, “I will not fly the airplane below a 110 knots”, except in the flair, is not a good training method or going to save yourself from a stall.  Knowing how the aircraft feels approaching a stall and how to recover before entering the stall in these situations is paramount to not entering the stall. 

 

Luke Alcorn

 

Luke,

 

Nice try.

 

As pilot in command, you have control over real flight.  In PP 2, you are not quite correct.  At low altitudes, birds climb (this is a documented observation) -- BTW, Ask Bill.

 

PP3, You should know your plane's slow speed handling characteristics and you can tell the controller that you "cannot comply" and request a go-around.  No one here has ever suggested that you shouldn't know and practice slow speed flight, you need not stall.  After all, the 320/360 emergency gear extension procedure requires that you slow to 87 KIAS.

 

PP4 - How about wind shear - keep your speed up and remember that it is not against the rules to push the stick forward even when near to the ground.

 

It is clear to me that one must learn not to try and fix every problem by pulling back on the blessed stick.

 

Grayhawk

 

In a message dated 10/5/2008 3:41:56 P.M. Central Daylight Time, lalcorn@natca.net writes:

I would like to add to this discussion on stalls and slow flight handling of aircraft.  One thing I see discussed by pilots is that, they do not need to practice stalls or slow flight because they know the speeds and simply stay faster than those speeds close to the "slow realm" of flight, which I would infer is also the region of reverse command and just above.  This is a great safety idea in ideal conditions, your familiar airport, standard traffic patterns, no controllers, etc.  Unfortunately real flight is nothing like this. 

One good example is bird avoidance.  The proper method of avoiding birds is to climb and turn, since birds will typically dive away.  So you are on a downwind, gear extended, flaps slightly out, and there is a 10lb turkey vulture and you pull and turn.  Sounds close to an accelerated stall, doesn't it.  If you do not know what your plane feels like at slower speeds, how will you know how hard to pull or when to recover.  Add this during a base to final, and you have a stall spin accident.  How many of these accelerated stall base to final crashes have happened in the last year alone? 

Next example is when you add those pesky controllers trying to fit your 120 knot aircraft behind a 150 in the downwind at an airport with a 3500 foot runway.  They ask you to slow, you do the best you can, but still eating this guys lunch.  Your busy configuring etc, then the tower controller sees its not going to work and orders a go around when you are crossing the threshold with full flaps and gear hanging out, starting to round out.  Do not think they won't do that either.  Especially with the new generation of controllers being hired off the street, many are not familiar with aircraft characteristics and are only concerned about having an error.  How many of the "don't practice slow flight/stalls" practice full landing configured go-arounds at high rates of descent.  Again, knowing your aircraft's slow handling characteristics might help here.

How about wind shear?  I've been in clear VFR days in florida and catch the outflow from a storm 20 miles away while in the downwind and loose 25 knots in an instant with a nice downdraft.  What is your natural instinct when you encounter a large sink close to the ground?  Pull back now that you are only 6 knots above stall?

I could go on and on with examples, but just things to think about.

Previously stated "The initial training for a Lancair needs to include exposure to the stall to assess the speed at which it is likely to occur. That assessed, continued testing of that seems superfluous given the mind set should be clearly engraved to avoid the area whereby such a condition of flight occurs".

How can you simply avoid these regions of flight given the examples I have just stated?

Luke Alcorn




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