Sunday, November 30, 2008

Eagle Flight

EAGLE FLIGHT

By


Chuck Rhodes

14 May 2002

In the late spring of 1985 I went to fly the great Owen's Valley of California. Here the Sierra Nevada Mountains to the west, and the White-Inyo’s to the east, form the Owens Valley in between. From the summits of the towering 13-14 thousand foot peaks on both its east and west sides, all the way down to the valley floor averaging around 3000-4000’ above sea level, it is America's deepest valley. Due to this unique geography the Owens can produce some of the strongest thermals and most magnificent and demanding soaring conditions in the United States, if not the entire world. For this reason it has been called the “Mt. Everest of Hang Gliding”!


I had launched my Progressive Air - Pro Star 190 flex wing hang glider around 1030 in the morning at the eastern Sierra take off site known as Horseshoe Meadows. The Horseshoe launch is located on the eastern slope of the Sierras above the southern end of the
Owens Valley. At about 18 miles south of Mt. Whitney as the crow flies, the take off area is on the side of a mountain and faces southeast. It overlooks the southern region of the Owens valley and the Owens Dry Lake bed, well over 4000’ below. During the soaring season hang glider pilots from around the world seeking long, high cross country flights flocked to Horseshoe Meadows. There their dreams of record breaking 100 + mile flights along the high spine of the Sierras and White-Inyo mountains could potentially be realized. Several flights of well over 200 miles had started here and altitude gains to 15-18,000’ were common. Rough mountain air turbulence, strong down drafts, and afternoon high desert winds were also not uncommon adding to the challenge, difficulty, and potential danger of flying the Owens.

Soon after taking off I hooked a good thermal and climbed out rapidly to about 2000’ above launch. Soaring and circling upwards past the top of the high ridge north and behind the launch site, suddenly the entire snow covered range of the Sierra Nevada Mountains sprang into view. The sky that morning was a deep blue contrasted against the brilliant white high mountain snow fields and grey-brown rocky peaks. A few wispy white cumulus clouds were beginning to form high above indicating good soaring conditions. Numerous lakes, some still frozen, dotted the high Sierra alpine valleys below as far north and south as the eye could see. Directly to the North was the lofty 14,495’ peak of Mt. Whitney, the highest mountain in the continental United States outside Alaska. Climbing higher in continuing good lift to 13,500 I flew straight toward it over jagged rocky peaks, sheer granite walls and sharp precipitous rock ridges.

Slowing about 5 miles from Whitney to gain more altitude in a small thermal I climbed up to around 14,900' and soared directly on until I was directly over the summit of Whitney. I could see several mountain climbers coming up near the top, now only about 500' feet below me. It was a magnificent view. Wanting to put cross country miles behind me however, I took one last look at Whitney and continued my glide north.

Unfortunately I failed to encounter any thermals and began to slowly lose altitude. About 10 -15 miles farther north I was down to 11,000’ and desperately looking for lift. When you are in this area, and find yourself down to approximately 10,500' with no lift, you have to head east out over the Owens Valley. This is because the only available safe landing areas are way out beyond the western valley floor. Here the valley is full of steep foot hills, sharp treacherous volcanic flows and generally rough terrain. Because of this if I did not find lift very soon I would have no choice but to turn while I still had enough altitude to glide out to a safe landing area on the valley’s east side.


Then just at the last minute I spotted two big Bald Eagles not 300 yards from me and lazily circling up in light lift over against the side of the mountain. I turned left and headed right for them hoping to catch the same thermal lift they were riding. I fully expected the eagles to be scared off and fly away. However, much to my surprise and delight the eagles did not leave. As I entered the thermal and started to circle they instead closed in to about 10 – 15 feet off my wing tips, one eagle on the left and the other on the right. Together the three of us made big lazy circles slowly gaining altitude in the light 200-300 foot per minute up lifting air. The eagles perfectly matched my speed and turn radius while sticking like glue to my wing tips as we soared ever higher. I could see their beautiful white heads, sharp yellow beaks and bright eyes turned and looking intently at me. I was able to clearly see their primary wing tip feathers moving up and down in the airflow vortex off their wing tips while their tail feathers banked from side to side subtlety controlling their flight.


Together we watched the mountain get smaller and craggier as we circled and circled in the thermal climbing ever higher toward its peak. Lift began increasing to over 500 feet per minute at around 12,500’ and each turn took us rapidly closer to the summit, the Eagles still with me all the way. I could not help but think that I was the luckiest guy in the world right then. To soar with these majestic birds in their own element, to feel the same sensation of cold crisp mountain air blowing past your body, hearing only the sound of the wind whistling off your wings, was like a dream. It was as if these graceful but powerful and magnificent soaring creatures of the sky were welcoming me into their world and I was one of them!


As we climbed higher, following the SE side of the mountain face and circling only a couple hundred feet or less from the rocks, I noticed a puffy white cumulous cloud forming about 2000' over the summit. Suddenly we zoomed up past the 13’000’ craggy frozen granite rock that was the mountains summit. We kept on circling and climbing while the mountain dropped away beneath us. Up and up we went 13,500, now 14,000, and still climbing. One man bird and two magnificent American Bald Eagles still stuck to my wing tips. At 15,000 we were right under the cloud and at 15,500 the wispy damp cold fingers of cloud base began to envelop us. I could climb no further without experiencing white out inside the cloud. Suddenly the eagles peeled off and headed south to points unknown in the high Sierra skies. I turned sharply north, yelled “Yeeeee Haaaw” in an incredible expression of excitement as I continued flying on northwards along the eastern spine of the Sierra. I flew straight on course for about 10 more miles maintaining and then slowly beginning to lose altitude.

By then I was still over the eastern slope of the Sierras but just southwest of town of Bishop California. I had only lost about 1000’ since parting formation with my Eagle friends and was down to around 14,500. It was around 12:30 and time to fly over to the White-Inyo Mountains to the East. Once the sun gets high overhead the Owens Valley floor, and then the western slopes of the White-Inyo’s, begin to heat up. This frequently generates strong thermals allowing you to soar across the valley and on northward along the Whites and beyond into the late afternoon.

So I turned east and headed out 10-12 miles crossing over the mighty Owens Valley to the White Inyo Mountain Range just north of Westgart Pass. However, finding no lift but considerable descending air instead as I flew faster over the wide valley floor to maximize my best glide ratio. Still, I continued losing altitude quickly. I was down to around 6500’ when I arrived over the western foot hills of Black Mountain in the Whites. Desperate to find another thermal and to avoid a subsequent pre-mature end to my flight by having to land there, I finally hooked a small, bumpy, but workable thermal back up to 11,000. Continuing on farther North I found additional strong tight and bumpy thermals but they were all petering out around 11 to 12 thousand. Luckily as I flew north and the White-Inyo range got higher I finally caught a good one taking me back up over 14,000’. Then passing just west of the spectacular 14,252’ summit of White Mountain Peak, third highest in California, I could now see the north end of the White-Inyo range stretching far out into the Nevada high desert.

I continued on and out over the end of the range but by then the thermals were weakening, I was cold, tired, and somewhat hypoxic from prolonged high altitude flying and knew it was time to come down. Finally after flying over 6 ½ hours I landed in Nevada 103 miles to the north of the Horseshoe Meadows take off. My driver, whom had followed and maintained radio contact with me during the flight, was waiting there at the landing zone. Upon landing, unhooking from the glider, and squirming out of my harness, he presented me with several well earned and ice cold congratulatory beers.

Although physically exhausted, dusty, but warming back up quickly now that I was down in the desert heat, I found my thoughts quickly racing back up into the cold crisp high altitude air. I could only think, “What an incredible flight! Soaring for miles and miles above the high snow covered peaks and up to the wispy base of the white clouds. No engine except the sun’s energy and warm rising air to power me through the skies. Seeing the world far below for hundreds of miles in all directions. Flying wing tip to wing tip with Bald Eagles! Hang gliding had made this possible. What a sport! What an experience!! I am alive, my life renewed and rewarded beyond all expectation.

Now looking back to that wonderful day I was thrilled, yet totally humbled, to have been one of the lucky few among human kind to have truly soared with eagles! Those few fleeting moments we had shared in the skies high over the Sierra would forever live on in my mind and soul. I knew then beyond all doubt the special honor they had bestowed upon me. They let me soar beyond the human experience into their realm and within the true spirit of the Eagle. Even now, many years later, that spirit remains with me. Whenever I spot an Eagle, or another of the great soaring birds flying high overhead, I am one with them. For there I have been and forever there I shall remain.

Windsurfing Mast Kevlar Wrap Protection

For the last 10 years I have been applying a wrap of light weight Kevlar bi-directional cloth to my carbon windsurfing masts to protect them for wear and abrasion where the boom attaches to the mast. I have found this to be a very effective method to prevent mast damage over time. It is also interesting to note that the famous American windsurfing wave mast maker “POWEREX” has also been using a Kevlar wrap around the boom area of their RDM wave masts for the last few years to give them added protection from boom to mast wear.
I am now also going to experiment with doing the same thing in the area where my race sail cambers mate with the mast and cause wear from the constant back and forth rotation over time on the masts.

The materials you need for this are:

1. Lightweight (1.7 – 2.5 ounce/square yard) bi-directional weave Kevlar cloth

2.5 Ounce/Sq.yd bi-directional Kevlar cloth

2. Kevlar cutting scissors or shears

Kevlar Cutting Scissors

3. Quality 2 part Epoxy resin and hardener system
4. Roll of 2-3” wide “Peel Ply” Dacron cloth (http://www.aircraftspruce.com/catalog/cmpages/peelply.php)

Peel Ply

5. 60, 100,120 -150 grit dry sand paper
6. 220 grit wet/dry sand paper
7. Black enamel spray paint
8. Epoxy mixing cups, protective latex gloves, safety glasses,
9. Acetone for cleaning up wet epoxy resin and mix spills etc.
10. Plastic “Squeeges” and small disposable paint brushes

Plastic squeegees and disposable epoxy brush

11. Light weight epoxy filler. I use West System Microlight 410. See: http://www.westsystem.com/webpages/productinfo/guide/index.htm or
http://www.aircraftspruce.com/catalog/cmpages/microlight.php

12. Epoxy scraper

The process to apply the Kevlar is as follows:

Identify the high and low boom attachment points on your mast and determine distance between the two. Then add about 4” (10cm) to the overall measurement. This is to allow some of the Kevlar wrap to extend a little about and below the boom attachment area on the mast. I typically cover about a 16”(40.5cm) section of my mast.

Measure the circumference of the mast by wrapping a piece of paper around it in the area where the Kevlar wrap will be applied. Allow for about a ½” (1.5cm) overlap.

Lay out Kevlar wrap on clean paper or cloth to prevent dirt or other contaminants to touch it. (Keep in clean). Using a felt tipped pen and ruler, mark out a section of the cloth (Length x width) based on your measurements. Then using your Kevlar scissors*, cut the cloth carefully. Once cut handle carefully and don’t stretch the cloth out of shape. Set is aside for later use. (Note: Kevlar is very tough and will quickly dull a pair of regular scissors)

Using plastic tape wrap tape around mast about 1 cm above and below the upper and lower measurement marks you will use to determine where the Kevlar cloth will be applied on the mast. Then wrap newspaper around the mast for about 40 cm above and below the tape. Use more tape to keep the newspaper on and seal the edges of the paper. This is to prevent accidentally getting wet epoxy etc. on the mast in places you don’t want it.

Take 120 grit sandpaper and lightly sand the entire surface of the mast all around where the Kevlar wrap will be applied. Only sand enough to just rough up the surface. Don’t cut into the carbon fibers themselves. The purpose of this process is to create more surface area for the epoxy resin to bond to the surface of the mast.

After sanding brush off all sanding dust and then use a damp cloth to wipe off remaining sanding dust. Finally use cloth dampened with acetone to wipe off the area again. This will get rid of any skin oil, or other substances that may inhibit getting a good bond between the epoxy resin and the mast.

Support the mast up on blocks so that you can rotate it around and easily reach underneath it as you apply the Kevlar wrap.

Using small pieces of tape, tape the long edge of the Kevlar cloth to the mast area you are going to cover.

Mix your epoxy resin and hardner according to instructions. Then using your small brush begin painting on a thin layer of epoxy onto the Kevlar cloth. As it saturates the cloth use your squeegee to spread it out evenly and ensure it is pressed down and has completely wetted out the cloth.

Continue this process as you rotate the mast around wetting out the Kevlar wrap more and more until you are almost at the edge that has been taped. Then carefully remove the tape holding the edge of the cloth and continue wetting out the Kevlar wrap. Let the edges overlap and again use your squeegee to smooth out the overlap.

Once you are finished applying the epoxy resin to the cloth and have smoothed and straightened it all out the best you can then you are ready for peel ply.

Using your plastic tape, apply a wrap of tape around each end of the Kevlar wrap. You only want the tape to overlap the Kevlar by about .75 -1cm max. This is to ensure that the edge threads of the Kevlar cloth will be epoxied down flat against the mast and will reduce the need to add more filler and sanding later.

Cut lengths of “peel ply” 10 cm’s or so longer than the Kevlar wrap. Lay one along the wrap and use your squeegee to wet it out with the epoxy resin mix already applied to the Kevlar. Also use your brush to apply a little more epoxy to the outside of the peel ply in areas where there is not enough resin underneath to fully wet it out. You may need three lengths of peel ply to cover the entire circumference of the mast.

Wait 24 hours for the epoxy to fully harden. Pull the “peel ply” off. The peel ply will smooth out and help evenly fill the weave of the Kevlar cloth resulting in less filling and sanding later.
Pull or cut off tape and newspaper.

Now use an epoxy scraper to carefully scrape down any hardened epoxy bubbles. Ridges, bumps etc. Use caution not to scrape into the Kevlar cloth.
Wipe dust and wipe again with acetone. Reapply newspaper and tape about 1 cm higher and lower than before.

Mix epoxy resin and hardener according to instructions. Add lightweight epoxy filler and stir mix until it is a smooth, tooth paste consistency type mix. Use squeegee to spread the paste all over the Kevlar wrap area. Ensure all low areas and weave of cloth are filled. Smooth off as best as possible and remove excess to avoid more sanding that you need to do.

Filler applied and hardened. Ready for sanding
Let harden 24 hours. Then starting with 60 grit sand paper and sanding block, sand down thick high areas. Use caution not to sand too deeply or into Kevlar. After this, use 100 grit, then 120 or 150 grit to continue to sand down most of the filler all around the wrap. Again, use caution not to sand into the Kevlar cloth.

Try to sand the top and bottom sections so that you “taper” the filler from the edge of the Kevlar wrap down to the mast carbon surface. Note: You cannot sand Kevlar so be careful. If you see a “fuzzy” texture appear you have sanded into the Kevlar.

Once satisfied with above sanding and smoothing. Wipe off all dust and again wipe with acetone. Let dry thoroughly then use your black spray paint to cover entire surface area of the wrap.
Once dry use 220 wet sandpaper with water, to lightly sand again the painted area. This will additionally smooth out remaining rough or high spots. After drying repaint additional time.

Once paint has thoroughly dried and hardened, go sailing and enjoy the knowledge that your mast is now protected from boom wear for many years to come.


GOOD WINDS!