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Re: Advanced Fly on the wall landing.

Postby brianscharp » Wed May 04, 2016 4:49 pm

That was an extreme example, meant to show that for a given air speed, there'll be a reduction in horizontal speed as the flight path steepens.
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Re: Advanced Fly on the wall landing.

Postby Bob Kuczewski » Wed May 04, 2016 5:45 pm

Please take this with a grain of salt since my one downwind Torrey / Condor landing does not qualify me as an expert in this technique.

But from what I can tell, there are matters of aerodynamics and also matters of inertia. If one's velocity vector can be made parallel to the uphill slope (even if only in the instant before touch down), then it seems to me that would create a milder impact with the hill (due to inertia) than if there were any non-parallel velocity components directed into the slope. Also, since one is going uphill without power (assuming the tailwind isn't strong enough to classify as "propulsion"), there will be an apex point where at least the vertical component reaches zero. The lift generated by the wing will also be approaching zero as that happens, but then need for the wing to generate "lift" (which is perpendicular to the slope at that point) is reduced by the geometry of the situation. In the extreme (as Brian mentioned) - where the "hill" is vertical - there is no need for lift at all, and the "touch down" can be done at zero velocity at the apex of the forward (upward) motion. Of course, without actual "fly feet" to grab onto the hill, things will go rapidly "downhill" after that.    :shock:

So from my understanding, the effect of flying parallel to the slope for only the last instant should be the same as flying with extra speed parallel to the hill prior to (and leading up to) that last instant. In both cases, the glider will "stall" with the pilot's velocity parallel to the hill and at the same speed. The ability to do that without lots of extra speed requires a "master's level" of skill and timing (pun intended), while coming in with extra speed allows a longer parallel flight (assuming there's enough room) and less critical timing.

Does this sound like a fair analysis to everyone?
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Re: Advanced Fly on the wall landing.

Postby Bill Cummings » Wed May 04, 2016 6:49 pm

For any new pilots getting lost in this thread keep this in mind. When landing up hill, your final glide distance over the surface will be way shorter. The stall will happen way sooner than you are used to over level ground.
(Just the opposite happens when landing down hill.) ;)
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Re: Advanced Fly on the wall landing.

Postby Bob Kuczewski » Wed May 04, 2016 6:56 pm

billcummings wrote:For any new pilots getting lost in this thread keep this in mind. When landing up hill, your final glide distance over the surface will be way shorter. The stall will happen way sooner than you are used to over level ground.
(Just the opposite happens when landing down hill.) ;)


Thanks (again) Bill for keeping things simple and digestible (a skill I'm still working on).   :oops:
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Re: Advanced Fly on the wall landing.

Postby brianscharp » Thu May 05, 2016 8:44 am

How to do a proper Fly on the Wall Landing
https://vimeo.com/14476032
And a couple more.

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Re: Advanced Fly on the wall landing.

Postby reluctantsparrow » Thu May 05, 2016 9:10 am

Thanks for challenging my assumptions Rick.....good stuff! I had that one bad landing and did not really think it through. My splat could have just as easily been a poorly timed or poorly executed flare.
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Re: Advanced Fly on the wall landing.

Postby Rick Masters » Thu May 05, 2016 1:58 pm

Image
I was driving an empty crude oil triple tanker (9 axles, 34 wheels, 105 feet long, 60 tons loaded, pulled with a supercharged 2-stroke V8 Detroit Diesel engine) across the badlands of central Nevada when my old hang gliding friend Howard Gerrish passed me in his Mitsubishi Montero on a grade east of the highway maintenance station at Blue Jay. He didn't know it was me, of course, and I didn't know it was him. I remember his silhouette through the back window, black against the noon-lit desert, arm across the seat, kind of slouched back. He looked tired. Long drive. He shrank to a speck and vanished, far ahead.
    Half an hour later, I noticed a tan SUV parked way out in the sage brush. It was a little strange for anyone to be parked out there so I took a closer look. For a moment, I thought someone must have been doing some pretty serious four-wheeling because the vehicle was covered with gray dust - even the windows. Then I realized it was the SUV that had passed me. It must have rolled and landed on its wheels. I saw it all the time on that job. People get tired or bored, drift onto the shoulder, have that panic reaction and jerk the wheel, catch the highway edge and flip.
    The last one was only a few weeks before. I'd just parked the triple tanker on the scales at the Eagle Springs refinery in Railroad Valley and stepped into the office to pick up my manifest. One of the crew ran in and told the dispatcher there was a car wreck across the highway from the refinery. I told the dispatcher I was an emergency medical technician. He told me to leave the truck and get over there. I ran.
    It was a mother, driving alone with her baby and young son in a Suburban. She'd drifted off the road. The berm at that spot was six inches. When she corrected, the right tire caught the edge, locked left and the Sub rolled several times. Her little boy, unbuckled, was thrown out the broken side window on the second roll and the SUV came to rest on its side on top of him. We could see his little feet sticking out by the edge of the roof. I told the guys running over from the refinery to put their backs against the roof and lift with their knees. We crawled under and gently slid him out. His brains were dragging in the dirt.
    One of the guys put his hands over the woman's eyes but she had seen it. She was gasping, speechless, twitching, with a look of utter hopeless loss. The toddler was okay, safe in her car seat through the whole thing. But crying, terrified. I told the mother to take her in her arms. That helped both of them.
    People should buckle up. It keeps them inside their cars if they crash...

Anyway, I saw that dirty Montero and brought the big rig to a stop in the east-bound lane. No traffic anywhere. I ran over to the vehicle. Nobody in it. I looked around. There, between the bushes, was a body.
    People's fate sometimes falls entirely into the hands of the Good Samaritan beneath the baking desert sun, out there in the wilderness of Egypt, as we call it. In the densely populated worlds of others, they drive on by, expecting the cops, the search and rescue, a utility worker, a doctor, somebody else, to stop and render aid. But out here in the wilderness, driving on by is a death sentence for the injured. Most folks will drive by, anyway, oblivious, insulated from brutal reality by their plush, air-conditioned stereo cocoons. But not me. When my legs started roasting in that groaning cab, I'd open the door to let the heat out.
    I ran over to the guy. He was covered with $100 bills. Bills were caught in branches. Bills scuttled lazily between sagebrush, teased by a light breeze. He was on his back, moaning, bloodied, covered with dirt. I didn't recognize him.
    His eyes were closed. He was grimacing, his face lined in agony. "I'm here," I said. "I'm an EMT. I'm going to help you."
    "Thank you, boss," he said. I did a double-take. Howard had always called me "boss."
    "Howard, is that you?" I asked. "It's me, Rick Masters." We were 390 miles from Howard's home in Ridgecrest, California, where he worked as a chemical engineer at the Naval Weapons Test Center in China Lake.
    "We've got to stop meeting like this," I said.
    Howard was severely injured. He appeared to have a broken back and broken ribs. He was pale, going into shock.
    "Sorry, Howard, I have to do this." I knew I was going to have to leave him. I raised his legs and stuffed some branches under them, hoping it would buy some time. He screamed.
    "Get the money," he gasped. I quickly scooped up the Benjamins and stuffed them in my pockets. Thousands of dollars had popped out of his wallet.
    "Howard, I've got to get to Blue Jay to call an ambulance," I told him. "Hang on. I'll be back in 20 minutes."
    I ran to the truck. It was pointing the wrong way. I thought about dropping the trailers but it would take too long. I took her up to 15 mph and swung the wheel, dropping off the tarmac and curving off onto the soft desert sand. I engaged the drive-axle lock up as I hit the sand and caught one more gear, tearing through the sage brush, gripping the wheel tightly as the cab bounced wildly, feeling the drag of the trailers plowing through the sand dragging down the truck, wheels spinning, and knowing that if I screwed this up, my friend Howard was going to die. But I roared past Howard, arched back onto the road and was blasting the air horn at the locked gate at Blue Jay ten minutes later. I was prepared to crash through it and break into a building to use a phone when a fellow walked around a shed and approached.
    "Call Tonopah," I said. "There's a rollover eight miles up the hill. One guy. Broken back. Internal injuries. I'll be up there. They'll see the truck."
    Howard was still alive. I held a blanket over him for shade for over two hours, then the ambulance arrived. It was the last time I ever saw him.
    He sent his girlfriend by to get the money.
    "What money?" I teased. She scowled. "Oh, that money!"
    He'd been on his way to Idaho to vacation with his father. The big hunting vacation that never happened.
    Howard died in his sleep the next year. Just went to bed and never woke up.

Why do I tell you this?
    It's about landing hang gliders up-slope in turbulence. The back story.
    Howard was a lucky guy. Or unlucky, depending on how you look at it.
    He had a head-on collision with another hang glider pilot in the Owens, off Paitue, a few years previous. Maybe it was in 1981. I wasn't there.
    Helmet to helmet. Howard got knocked out. People were watching him drift around, hanging like a sack of meat under his Comet. He finally came down on soft dirt, gliding slowly. No damage.
    He liked to stay at a little motel on the south side of Lone Pine and fly Horseshoe Meadows. Sometimes he'd let me bum a ride up and I'd fly back to my car if it wasn't good. One day in the spring of 1984 we got to Walt's Point and it was backside. Everybody left. But Howard was bummed. He really wanted to fly.
    "Let's fly Mazourka," I said.

Image
So we drove down the Sierras, crossed the valley and headed up Mazourka Canyon. We had too much weight in the car and I remember it dragging on the high spots and Howard cursing. But we made it to the top and we both set up on the south face where I planned to hold the summer's contest in a few weeks.
    It got really gusty. No dust in the valley, but the wind would come from different directions, sometimes strong, sometimes weak. The sails would flap, then go silent. It was one of those days where you didn't dare stray too far from your glider. It looked to me like rock and roll, out in front. But probably better with altitude. Howard, on the other hand, didn't like it. He was shaking his head and frowning, not pleased.
    I might have packed it up but I was holding the big contest and still wanted to get a feel for the limits of this place. It would be the first contest here. So I steeled myself for some rough air, and launched my big Moyes Meteor into it. It was a mistake. The gods were angry.
    I was hit by powerful lift, then equally powerful sink, over and over, without a lull between. It wasn't sinusoidal, it was violent madness - and I hardly had any altitude above the jagged rocks. Up, down, up, down, and at each juncture, it felt as thought my harness was about to snap. I like big gliders but the Moyes was way too big for this stuff. It was everything I could do to keep it pointed out to the valley. Then I was slammed by the worst punch of down air I have experienced. Wings level, I slammed my back into my keel and watched the rocky ridge I needed to cross to escape Mazourka rise up in front of me.
    "I'm gonna have to land on that thing," I thought. I pulled my bar all the way back and dove through the turbulence, wings rocking wildly in a steep descent as I approached the base of the hill. The air was so rough that I was afraid to give it much flare.
    "If I can just plant it solidly against the hill without hurting myself, that would be luck," I thought. Then, about 30 feet from the hillside, I encountered calm. I gave a little more flare than I had planned and found myself standing on a 30-degree talus slope with the basetube still off the ground. I quickly dropped the nose and unhooked, then dropped the control frame.
    I'd made it. But it was one of my worst judgment calls.
    Howard drove down to Santa Rita Flats and picked me up. He couldn't understand how I had survived that air. It had looked so bad from where he had been standing, he was convinced he would be picking up a dead guy. But at least I'd learned what Mazourka was like when it was too rough to fly.
    I never saw Howard again after that, until that day years later in Nevada, when I saved his life.

So back to the up-slope landing stuff. In turbulence, air goes every which way. But near the ground, it goes every which way but down.
    If you find yourself in over your head in a terrifying situation, keep fighting.
    Even if it seems hopeless, fight all the way down.
    Keep up your speed and fight for every inch.
    You might just get away with it.
    And if you do, you don't just save your own life, you save your future and the futures of everyone you might save in your future.
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Re: Advanced Fly on the wall landing.

Postby Bob Kuczewski » Thu May 05, 2016 8:56 pm

Wow!!! Excellent writing Rick. I mean E-x-c-e-l-l-e-n-t !!
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Re: Advanced Fly on the wall landing.

Postby Frank Colver » Fri May 06, 2016 12:46 pm

Very good reading! :thumbup: :clap:

It reminds me of my big fight with extreme turbulence at Devil's Slide - sail inversions and all. What was a big battle to keep the HG flying in somewhat normal attitudes, ended with a stand up landing on the beach. Thank God i wasn't flying a PG or I would have died that day since the sail inversions started at about 300 AGL and continued down to about 50 feet.

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Re: Advanced Fly on the wall landing.

Postby Rick Masters » Fri May 06, 2016 1:36 pm

Image
Devil's Slide at Guadelupe Dunes (Pacific Ocean, Santa Maria, California)?
I had my first soaring flight there, almost dragging my toes to Devils Slide and back to the mid-point in a Seagull III.
A shear would sometimes set up north of Devils Slide along the shore and the south wind would rotor over it.
Killed a couple guys in the 1970s, I think.
If you got caught in that, you're very lucky to be here.
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