Brain teasers for those that believe down wind turns are

Published by: Joe Hockman on 19th Jan 2017 | View all blogs by Joe Hockman

If you believe that downwind turns are "different" from upwind turns, or if you think that a pilot can "feel" the direction of the wind, or that an aircraft tends to "weathervane" to point into the external, meteorological wind, then you might enjoy these brain teasers. Primary context is hang gliding but also applies to flying trikes.

Brain teaser #1:

1.) You are flying indoors.  In an immense, enclosed room.  The walls and floor and ceiling are black. You've launched off a platform near the ceiling and are practicing turns, stalls, stalls from turns, etc.  There is no evidence of any air movement in the room. Does your aircraft behave differently when flying in any particular direction?

2.)  Sunrise. You realize that what you thought were black walls, are clear glass panels. The room is actually the enclosed gondola of an enormous balloon.  As you look down at the newly visible earth, you see that the ground is passing by very swiftly far below. The balloon is in a stiff south wind, and is being blown northward over the land.  Now does your aircraft fly differently in any particular direction, within the closed room? Is it now more dangerous to turn downwind (toward the north) than upwind (toward the south)?  Just because the sun came up and now you can now see the ground? What if you close your eyes? Can you "feel" the wind by the way the aircraft responds when flying in different directions?

3.)  You notice that each of the transparent walls of this enormous, enclosed room has several large windows.  Someone comes and opens all these windows. But no air blows in through them.  Likewise the flags that decorate the outside of the gondola hang limp. Anyone who has ever been in a balloon will recognize this to be true, and the explanation for this is simple: the balloon is moving freely with the airmass without resistance, and so the balloon's velocity is constant, and so acceleration is zero, and so net force also must be zero: the wind cannot be "pushing" on the balloon in any way.  Since the windows are now open the airmass in the room is now the same as the airmass outside. Now does your aircraft fly differently in any particular direction? Is it more dangerous to turn downwind (to the north) than upwind (to the south)?

4.) The balloon is too heavy and needs to shed some weight.  Someone hits a button and all of the walls get jettisoned. The floor, ceiling, and corner pillars are all that is left of the "room".  Again, no air is blowing through the "room". Now is a downwind turn (to the north) somehow "different" than an upwind turn (toward the south)?

5.) You fly out of one of the missing walls and into the clear blue sky.  Now is a downwind turn any "different" than an upwind turn? Is it easier to stall when turning downwind than when turning upwind?

(P.S. Part 3 of brain teaser #1 brings to mind another old puzzle: if a fly takes wing within an enclosed aircraft, do the wings of the aircraft no longer need to support his weight?  What if a window in the cabin is open?  What if the fly is buzzing around the cockpit of an old open-cockpit biplane?  What if the fly flies out of the open window (or out over the side of the open cockpit) and then flies along in formation with the aircraft?  What if he positions himself directly over one of the wings?  At what point as the fly approached the window (if any) did the aircraft stop "feeling" the weight of the fly?)

 

Brain teaser #2:

We are flying in still air over the San Andreas fault. Suddenly the block on the west side of the fault starts sliding rapidly northward.  (Devastation is breaking out below).  As we fly from across the fault from east to west in the still, uniform, airmass, we suddenly find ourselves flying in a north wind in relation to the land immediately below.  Does this affect the way the aircraft flies?  When we are on the west side of the fault line, are we in more danger of stalling during a "downwind" turn (toward the north) than during an "upwind" turn (toward the south)? 

 

Brain teaser #3:

Aliens arrive.  After consulting with Art Bell, they decide to use their advanced engineering prowess to abruptly halt the earth's rotation.  You are piloting an airliner at 30,000' over the equator, and the effects of this little disturbance have not yet propagated to your altitude--the layer of the atmosphere surrounding your aircraft is still rotating at a normal rate.  From your perspective, the ground has suddenly started moving toward the west at 1,038 mph.  Relative to the ground, you are now flying in a 1,038 mph west wind.  Does this have any affect on the way that the plane flies?  Are "downwind" turns (toward the east) now different than "upwind" turns (toward the west)?

 

Brain teaser #4:

You are in still air. Looking straight down, you see a train driving south at 60 mph.  You decide that the train constitutes the "surface" of the earth for the few seconds that you are overflying it. As you overfly the train, you are in a 60mph south wind, in relation to the "surface".  Does this affect the way your aircraft flies?  If you close your eyes and fly in circles over the train, will the "feel" of the aircraft tell you which direction the wind is blowing, i.e. which direction the train is travelling?  Is there a greater danger of stalling when you are flying "downwind" (flying toward the north), or when you are performing a "downwind" turn (flying toward the north), than when you are flying "upwind" (flying toward the south), or when you are performing an "upwind" turn (turning toward the south)?

(Extra credit for hang glider pilots: do you have to "flare" your glider differently when landing on top of the southbound train with the nose of your glider pointing south, than when you land on top of the southbound train with your nose pointing north?  Obviously answer is "yes"--landing with a 60mph tailwind would be disastrous--but why?  Does it have to do with the behavior of your glider in relation to the air?  Or does it only relate to the fact that you are trying to minimize your glider's groundspeed at the instant that your feet touch the ground?  If you were practicing flares at high altitude, aiming for a given profile in the airspeed and sink rate with no concern for ground track and groundspeed, could you tell when you were over the train by the way the glider felt when it flared?)

 

Brain teaser #5:

This one also applies to those who believe that an aircraft flies differently in "lift" (rising air) than in "sink" (descending air).

Let's ignore the earth's surface, and take the sun as our reference point. In relation to the sun, the earth's atmosphere (as well as the rest of the earth) is moving at 66,674 mph.  If we are near the equator, the direction of motion of the atmosphere (as well as the rest of the earth) is (roughly speaking) toward the west at noon, toward the east at midnight, straight up at sunrise, and straight down at sunset. So we have an east wind at noon, a west wind at midnight, an updraft at sunrise, and a downdraft at sunset.  (Don't confuse yourself by factoring in the earth's rotation around its axis, which is a mere 1,038 mph at the equator).  Bearing this incredible wind velocity in mind, does an aircraft fly differently when turning to the west at noon, then when turning to the west at midnight? Does an aircraft fly differently in the sunrise updraft than in the sunset downdraft?

Comments

7 Comments

  • Gregg Ludwig
    by Gregg Ludwig 10 months ago
    Below is not really a "brain teaser" but a couple of question areas right out of the Sport Pilot WSC PTS Performance and Limitations (Task J)

    3. Describes the effects of atmospheric conditions on the weight shift's performance
    4. Explains the effects and hazards of high wind, referencing the ground speed, high rates of turn and power requirements on making downwind turns in close proximity to the ground.
  • Jake McGuire
    by Jake McGuire 10 months ago
    Fun stuff!

    1.1) no difference, but how many of us have flown a hang glider or trike in hard IMC? including a moonless night over unlit terrain?

    4) depends on how low you are when you're over the train. the train is moving 60pmh relative to the ground and to air far away from it, but the air right next to the train is being pulled along with it, creating a wind gradient between the two.

    maybe the answer is that we get a bunch of different information about how the trike is flying - visual flow, seat of the pants, control bar position and forces, instruments. integrating all the information is tricky, especially when some of it seems to disagree, so it's worth thinking about what's going on...
  • monty stone
    by monty stone 10 months ago
    my answer is... no, never, sometimes, perhaps, it depends. (though not neccessarily in that order.) monty
  • Joe Hockman
    by Joe Hockman 10 months ago
    Thanks Gregg, Jake and Monty for your comments on this blog. I can take no credit for this as it comes straight from Steve Siebel's website here ( http://aeroexperiments.org/brainteasers.shtml ). My guess is that all seasoned flexwing pilots know that we fly within the parcel of air surrounding our wing and trike. So here is the caveat, in actuality down wind turns can be very different (see http://www.aeroexperiments.org/downwinddifferent.shtml ). Also, I did get a kick out of the never-ending myths about down wind turns (see http://www.aeroexperiments.org/downwindmyth.shtml ). Thanks again.
  • PHILIP QUANTRILL
    by PHILIP QUANTRILL 10 months ago
    Here is a link for downwind turns, I found it very interesting see what you think . Regards Phil.

    http://www.microlightforum.com/showthread.php?2606-The-Down-Wind-turn&highlight=downwind+turns
  • Joe Hockman
    by Joe Hockman 10 months ago
    Hi Phil, thanks for that excellent reference information on downwind turns. Enjoyed it and recommend it as reading for others here.
  • Glade Montgomery
    by Glade Montgomery 10 months ago
    Phil, the piece you referenced is indeed excellent. It does an excellent job of distinguishing between the notion that turning in a constantly-moving mass of air has any aerodynamic effect (it positively does not), versus the many real perils that exist in regard to turning in the presence of wind shear, turbulence and proximity to the ground. It drives me crazy when so many pilots (many who positively should know better) confuse the latter with the former.
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