What happens when the wind is too weak to sustain a glider at ridge top? You will settle down lower and lower, until you almost get down to ridge top. Then, you will immediately have to leave the ridge and head toward a landing option.
This process happens very quickly. If you’re 400 ft above the mountain and the ridge is not working, you will be down at ridge top in as little as two minutes. The trees will be filling in your canopy very rapidly.
Note that you will NOT settle into an “equilibrium point”. No matter how low and slow you get, you will NOT sustain at ridge top.
Maintain your airspeed at least at Best Glide Speed with the ridge coming up at you, it will be tempting to pull back to keep the nose level with the mountain. Watch your airspeed like a hawk and don’t be tempted to pull that stick back and get any slower.
Plan on leaving the ridge at 150ft above the trees. Settling down lower and slower will rarely help you and yet the risk of doing so is very high.
Once you leave the ridge, transition immediately into a landing mindset. You will be down on the ground in the next 2-4 minutes. Take a deep breath. Do your landing checklist. Focus on making a nice landing.
You should not put yourself below ridge top. Should you attempt recovering below ridge top, you will be forced to fly low and slow in weak lift while in gusty conditions. This is dangerous. If you are a beginner, you must maintain good situational awareness and judgment to avoid these situations.
However, the Aero Club Albatross ridge training syllabus demonstrates a below ridge top recovery so that pilots: A) Understand how the ridge band works below ridge top, B) Are equipped with the knowledge to safely recover should they choose to.
1. How do we find ourselves below ridge top?
There are two ways to fall below ridge top. One way is because the ridge is too weak to sustain you above. In such a case, you should immediately leave the ridge and head for a field in the valley below. If the ridge is not working above ridge top, it will certainly be no better further below. A good minimum for a weak ridge is 150ft above the trees at Best Glide speed. Note that this is a minimum. Mentors and coaches would be wise to advise beginners to fly in considerably stronger conditions.
Also, a pilot can fly lower and faster if they would like to, but the ridge needs to be commensurately stronger allow them to go 10+ knots faster 50-100ft above ridge top.
If you settle down to ridge top, then expect to leave in short order.
The second reason we can find ourselves below ridge top is if we are transitioning low from elsewhere to a working ridge. For example, if we are crossing a gap and encounter sink in the middle of the transition.
Beginners should be doing transitions with ample energy so that they don’t end up below ridge top on the other side.
2. Does a ridge work below ridge top?
Sometimes yes, sometimes no. It depends on the wind speed, direction, and shape of the mountain. If the angle is off, you will often find the wind funnels parallel below ridge top and the lift works very poorly. If the angle is closer to perpendicular, there is a better chance that it will work. The next factor is wind speed. Sometimes the wind at ridge top is sufficient for the ridge to work well, but when you get 100ft or more below, the wind weakens to the point that the lift can no longer sustain a glider. The final factor is ridge shape. Usually a ridge flattens out toward its base. If the slope becomes sufficiently flat, even a strong wind will not deflect sufficiently upwards to sustain a glider.
However, if the slope is sufficiently steep, the angle sufficiently good and the wind sufficiently strong, it can be possible to recover 1/3 to 1/2 of the way below ridge top.
3. What is the technique for recovering below ridge top?
The first step is to select an appropriate airspeed. Usually best glide speed is a sufficient minimum airspeed. Next, slide into the ridge band at a flat angle. You will need to be right up against the trees as the lift band below ridge top is usually very narrow. Expect the lift to be weak; it can take a long time to work your way up. As you fly in the weak lift, avoid the temptation to turn in little gusts as you are more likely to lose more altitude than you will gain in the turn.
At any time, be prepared to turn away from the ridge. If you hit sink or turbulence, be on a hair trigger to turn away from the ridge and give yourself more room underneath you.
If you do decide to turn, recognize that you probably have only one shot. If you can complete the turn in lift, you will do well, but if you lose 50-100ft by misjudging the turn, you will likely fall into weaker lift below you.
If this discussion sounds scary and risky, that’s because it is. Recovering from below ridge top is an expert maneuver and is not recommended for beginners. However, we emphasize these techniques for general knowledge and safety. At some point you may encounter a situation that requires applying these techniques. As a result, we train pilots such that they are familiar with what to do in these situations.
After we release over the ridge, the next crucial step is to test out the soaring conditions. We are primarily interested that the thermals are working and that the wind strength and direction should make the ridge work nicely.
We often try to find a thermal right off of tow. This works well as it gives more time to assess the conditions and gives us confidence that we can find a thermal later when we want to get back home. If we find that the conditions don’t look all that solid below us, we will often take this thermal up to cloudbase and fly the rest of the day in the thermal band!As we thermal, we note the wind strength and wind drift as the thermal takes us a couple turns downwind of where we started.
Next, we compare our drift to wind markers at ridge top. At Blairstown, the Upper Reservoir is an excellent wind indicator. You could also look at the steam plume rising off of powerplants, flags, and trees dancing at ridge top.
With some experience, you will be able to look at these wind markers and use them to accurately estimate wind strength.
You could also pay attention to your crab angle on the straightaways; the more you must crab, the stronger the wind.
Ideally, you want to see the wind strength above ridge top be somewhat greater than at the surface. If you don’t have that wind gradient, then the top of the ridge band might get cut off lower than you would expect.
Normally, you want to see winds 15-25 knots at ridge top, within 30 degrees of perpendicular for the section you intend to fly.
Once you are satisfied that the thermals are working well and that the wind looks reasonably solid at ridge top, you test out the “high” band. This entails settling down to 2,400ft, checking your variometer and feeling if there are gusts coming up underneath the glider. A 1-26 will sink at ~200fpm at best glide speed. If you are in “good air”, you will be settling down only at 100fpm. Even though you might not be sustaining, this suggests that the ridge is working underneath you.
As you are settling down, you should be positioned to leave at one of the two exit points (Doc’s Thumb or Upper Reservoir). Once reach a decision point at 2,400ft MSL. If you feel confident that the ridge is working underneath you. Otherwise, you will strongly consider leaving back to Blairstown Airport. If you elect to settle down lower, you will becommitted to the field at the base of the ridge should the ridge not work.
As you settle down lower yet, you will probably feel the lift strengthing and you have to speed up to maintain the same height above the ridge. Speed up to 65-70 mph in a 1-26 and settle down as low as the ridge lift will let you go. If you get down to 100 ft or so above ridge top, you are now “down on the trees”. Sometimes, the ridge lift is so strong that you can’t get down on the trees and will still be several hundred feet above the mountain!
At this point, you have successfully tested the ridge! Now you could go and stay low and fast, or you could transition back into the higher “float” band if you prefer to avoid the beating.
The whole process can take you an hour or more to build your confidence in the conditions. Experienced pilots can judge the conditions considerably quicker and go through the process much more rapidly if they want to. However, they are still doing all of these steps; we don’t simply drive down on the ridge on a hope and a prayer.
Ridge lift is awesome because it’s a nearly continuous lift source, so long as you have wind blowing and a mountain beneath you to push the wind up. When this happens, the lift sets up in a particular “lift band”. The best part of the band is called the “sweet spot”. This perfect position is very narrow; sometimes only one or two wingspans wide.
The sweet spot is simple to find down “on the crest”. The crest is defined abeam the top of the mountain and somewhat in front of the steep part. When you’re “down on the trees”, it’s fairly easy to find that sweet spot.
If you drift just a little bit downwind, the lift tapers off VERY rapidly. Drifting downwind is VERY bad.
Upwind of the ridge, the lift slowly weakens, but you still have good air quite a ways farther down the slope.
As a result, always err upwind rather than downwind. You can do little wrong being a little too far upwind. A little too far downwind, the lift goes away and you’re in a very bad place.
If you want to “float” higher up the ridge and get into the higher part of the lift band, you must push away from the mountain. This is because the sweet spot in the lift band moves further and further upwind as you get higher. If you get 1000ft above the mountain, the sweet spot may be as far as 1/2 mile upwind!
Failing to crab correctly- We always fly with a crosswind on ridge days. This requires crabbing upwind to maintain our position. As you slow down, swing the nose further upwind. Maintain wings perfectly level with the horizon.
Holding steady pressure on rudder/ailerons- Pay attention to your controls. If you are consistently holding pressure to one side or another, the sweet spot is probably in that direction. Conversely, if you are unable to position the controls exactly neutral, you will have a much harder time finding the best part of the band.
Aiming the nose down along the mountain- This is very common; pilots have a tendency to aim their eyes down along the mountain and try to align the glider accordingly. But as they do this, they end up flying at a minimum in a continuous slip. Other times, they end up drifting out of position relative to the mountain immediately beneath them.
Drifting downwind- When you position yourself just a hair downwind of the lift band, the upwind wing gets pushed up because the lift is stronger upwind. This pushes you even further downwind. Pilots that get on the downwind side will then often “hunt” back and forth, tick tocking off the sweet spot and then bouncing back downwind. As we learned, the lift band is sharply defined on the downwind side and you really don’t want to be there. Instead, always err slightly to the upwind side.
Gusts pushing upwind wing up- Never, ever let your wing get pushed above level with the horizon. If a gust pushes your upwind wing up, immediately correct for it and push back upwind. Don’t drift downwind!!
Suppose you settled down lower and you felt that the ridge was not working. Or, it’s the end of the day and you want to go back home. At some point you will need to exit the ridge and make the 3.5 mile final glide back to Blairstown Airport.
The minimum altitude to leave is 2,400ft MSL at one of the ridge exit points (Upper Reservoir/Doc’s Thumb). There are several reasons the club selected this margin.
In a low performance ship, you will definitely not be high enough to make a full pattern if you leave lower. Leaving at 2,400ft is marginal for a full pattern as it is and you should be fully prepared to make a non-standard approach.
The lower you are, the stronger the sink. On the upwind side, the lower you get to the crest, the stronger the lift. The opposite is true on the lee side. So leaving 200ft lower may lead you to being 400 ft lower on the far side of the sink!
It is hard to find the landmarks and the airport if you are lower than 2,400ft. This makes it easier for you to get lost along the way.
If you are unable to get to 2,400ft, simply land at the field at the base of the ridge.
If you’re able to thermal up higher than 2,400ft, that’s certainly better! Ideally, you would leave in a thermal at 2,900ft or higher, drifting downwind in it. This is called “coming home like a gentleman”. You will ride over the top of all the sink and turbulence and get back with plenty of energy to spare.
Situational awareness for the final glide
Anticipate the sink. You may encounter severe sink on the back side of the ridge. Put the nose down and punch through it. It will eventually stop.
Once you get out of the sink, trust the performance of the glider. You will have a 15-20 knot tailwind. You will be high enough to get back to the airport.
Plan your approach early. Be willing to do a non-standard pattern if you’re a bit lower.
Once you decide to leave over the back of the northwest ridge, there is no turning back. You cannot change your mind 10 seconds later; you will very quickly not have enough energy to make it back to the ridge thanks to the strong tailwind pushing you along.
When you encounter the sink, put the nose down and ride it out. The sink is temporary and will go away. Even if it gets really bad, keep the nose down and drive through it.
When you get out of the sink, you will feel an acceleration as though as you hit a thermal. This is from going in strong sink to no sink. Some folks confuse this for a thermal, but don’t circle in it. Even if you’re low, keep going. You will have the airport made.
Once you get to Rt.94, plan out your approach. Are you going to do a non-standard pattern? Be prepared for a lot of sink and turbulence. Keep extra speed in the approach and follow the guidance in the Ridge Landing video.
Leaving lower than 2,400ft- For reasons described above, this can get you into more severe sink and very low in a scary place.
Believing the sink will last forever and crashing in the Lower Reservoir- Several pilots have crashed their gliders in the Lower Reservoir when they thought they could not make it home. Even if you get flushed in the sink, it will eventually end. Ride it out and cross the hill; don’t turn.
Turning in the transition from sink to no-sink- Don’t get tempted by this transition. Keep the nose down and keep going; you will make it home.
Not trusting the performance of their glider- A pilot crashed a two-place ship in a field short of the airport when they thought they could not make it. Once you get out of the sink, you will have a 15-20 knot tailwind. Remember that the strong sink is temporary. Once you’re out of it, you will have the airport made.
Poor approach planning- Don’t aim for the middle, don’t make a low and slow pattern. Be prepared to make a non-standard approach.
Once you get off of tow, you should take stock of your situation. There are several things that can happen in the next several minutes:
Find a thermal and get higher.
Settle down to 2,400ft abeam one of the ridge exit points. Leave back to Blairstown Airport.
Commit to the field at the base of the ridge. Get below 2,400ft and the ridge works!
Settle down on the ridge. The ridge does not work and you land in the field at the base of the local ridge.
There are two ridge exit points. One is the Doc’s Thumb route, which goes over the Lower Reservoir, through a gully and lines you up with a right base for 25. The other route is abeam the Upper Reservoir, and is my preferred path. This lines you up with a left base for 7 and positions you directly with the Dairy Queen field along the way.
When you’re at 3,400ft, you should find the airport and the landmarks around it (Dairy Queen Field, Lake Susquehanna, Ball Fields) and scope out your return back home. When you get lower, it will be harder to spot these landmarks.
We also pointed out a number of important landmarks along the ridge.
Corn Field- Large field at the base of the ridge which is your alternate landing option.
Upper Reservoir- The middle of the local ridge and an excellent landmark. Also a good wind indicator; keep an eye on the waves. If there are white caps, that indicates the wind is nice and strong. Pay attention to the streaks to get a sense of the wind direction.
Tock’s Island Golf Course- An emergency landing option
Delaware Water Gap- Southwest limit of the local ridge
Millbrook Powerlines- Northeast limit of the local ridge.
Note that you don’t want to fly the “high ridge” all the way to Catfish pond. Instead, you would transition to the lower “Catfish Ridge” if you were heading up to the Millbrook powerline. Beginners would normally stay on the “strict” local ridge, which goes from Sunfish Pond to the “saddle” before the upwind jump to the Catfish Ridge. We will demonstrate this in future videos.
April has undoubtedly been the most successful month in US virtual racing ever! Every night there has been around 50 pilots racing in exotic places all around the world.
Many pilots came back from a long hiatus from Condor to enjoy the high level racing again. Over the course of the past month, 193 pilots had registered on US Nightly Soaring. And there are many new faces, including many pilots who have little or no real life cross country/racing experience.
Many new pilots have now become acquainted with the wonderful scenery in Slovenia. And Slovenian fields have even become acquainted with Schweizer iron too!
We had flown in the Nephi, Blairstown, Montague, Truckee, Mifflin, Driggs, Omarama, Alps, Slovenia, Southern Norway, and Southern France.
We had flown gliders ranging from 1-26s to EB-29s!
It is quite possible that the Coronavirus had actually allowed us to promote the sport of soaring more over the past month than if it hadn’t come to pass. Many of the new pilots had little or no formal advanced training and little prospect of receiving it in their clubs even in the best of times. While they may have been familiar with the idea of cross country soaring, they had not actually done it themselves. Over the past month, we have seen pilots who were vaguely aware of “thermals” become competitive virtual racing pilots and eager to pass on their enthusiasm into real life flying!
My club’s Condor nights have also been very successful. We have flown over 10 tasks out of Blairstown airport, exploring the wonderful ridge and thermal conditions our site has to offer. Pilots were introduced to cross country techniques, such as speed-to-fly, thermal selection, efficient centering, final glide optimization, and field selection. Pilots learned about different tasks, such as FAI assigned tasks, records, TATs, and MATs. We played with varying ridge conditions and toured the whole length of our local mountain.
Between ACA and PGC and others who have joined our server, we now have a large group of pilots who are up to speed on Condor flying and enjoying virtual soaring. And now these pilots know what soaring is all about and are looking forward to flying cross country in real life.
We are looking forward to May and continuing this wonderful run! Be sure to register on Condor Club!
Teamspeak: channel: ts3.virtualsoaring.eu:9982 | password: ask13 | Channel- MNS/USNS. (Note, please go to Settings and set up “Push-to-talk” for your mic.)
Register (for free) here to receive briefings two hour before the race and to submit your log for scoring.
Scenery Download: Use Condor Updater. (Best to subscribe for more bandwidth!)
Find “US Nightly Soaring” at 9pm Eastern (0100 UTC) here or here.
Monday Night Soaring at 7/10pm Eastern (2300/0300 UTC)
I’ve had many folks contact me through social media, email and through the blog contact with questions of how to set up Condor for their personal use, racing and for their clubs. Keep it coming; I’m happy to help!
Several folks have been doing paid one-on-one Condor coaching with me. If you would like to schedule a time to work on advanced soaring concepts in Condor (thermal selection, racing, centering, racing strategies, speed-to-fly, landouts, spins, risk-management, ridge soaring, wave soaring, etc. etc.), feel free to contact me through the Soaring Economist contact.
Ridge days are often windy and turbulent, leading to sporty approaches and landings. You should be 100 percent on your game to deal with sink, rotor, and a strong crosswind during the approach.
As you leave the ridge, position yourself in such a way to give yourself the most options. At Blairstown we often consider making a non-standard approach (base to final for 25 or 7 instead of a full pattern) when we are returning from the ridge. Aim at the numbers instead of the middle to leave yourself this option; if you end up over the middle of the airport, you are completely committed to making a full pattern.
Do your checklist early, especially if you have a strong tailwind. The landing is going to happen quickly and will require all your attention.
When entering the pattern, maintain extra energy in both airspeed and altitude. Crab to account for the crosswind on downwind; don’t drift downwind! Keep your downwind and base legs tight up against the airport property.
Make your base to final turn with extra altitude. Account for the wind in the turn; if you have a headwind on base leg, extend a bit farther and let the wind drift you back on final.
On final, aim for the middle of the airport; don’t aim for the fence! You want to make absolutely sure you will make it on the airport property despite possible sink and wind shear along the way.
Once on final, transition into a slip for the crosswind correction. Maintain your speed all the way down to ground effect.
After you land, make an effort to clear the runway by taxiing off.
Ridge days are windy and require dealing with a gusty, direct crosswind. This can make the tow very sporty and sometimes the most challenging part of a ridge day.
In order to manage the ridge tow effectively, you must be 100 percent ahead of the glider before the tow begins. You’re completely ready for the challenge ahead.
This means the glider was perfectly prepared during pre-flight. Everything loose was stowed. When you get strapped in, you cannot be rushed. And before you give the go-ahead to the wingrunner, you should have completed your checklists and completely thought through your emergency plan. You should be in the zone as the wingrunner lifts your wingtip.
When you begin the tow, you should be ready to input crosswind corrections. In the case of a crosswind from right to left, this means left rudder and right stick. You should also keep your right wing a bit lower than level.
Once you get airborne, you will then adjust a bit upwind and transition into a crab to remain in position somewhat upwind of the towplane.
Be ready for significant turbulence and shear. Often times when you get above a tree line, the towplane will accelerate and the glider will then hit a massive gust. This will likely cause you to hit your head on the canopy.
Hitting your head on the canopy is dangerous and will cause you to momentarily lose control of the glider, while in an awkward position to deal with a rope-break. Instead, you should be prepared for the gust beforehand.
The best solution for slack line recovery is to never let it happen in the first place. By being vigilant and actively maintaining position and adding tension to the line BEFORE the big gust throws you out of position, you can avoid almost all slack line situations.
To avoid getting flung out of position, you must maintain good position behind the towplane and some tension on the rope. First, this is by remaining just above the wake (which is a bit lower than “normal” tows.) Secondly, this is by strategically opening up the divebrakes when appropriate. If you see the towplane get flung up, open the brakes 1/4 of the way. The added drag and tension will keep the glider in position.
If you do get out of position, deploy some spoiler and correct accordingly. But be ready to release if your situation is not recoverable.
Always be ready for a rope break. You’re much more likely to experience a rope break in turbulent conditions. When it occurs, treat it like an emergency that it is, rather than an inconvenience. Be willing to go straight ahead for an alternate field well up to 400ft AGL rather than attempting a marginal turn, at or a little bit above 200ft.
The most challenging and dangerous aspect of ridge soaring is turning low and slow near the mountain. This puts the glider near the edge of stall while close to the ground in gusty conditions. This is the perfect recipe for entering a spin. Learning to maneuver near the ridge is probably the most important aspect of ridge training.
The remedy is to avoid these situations. A good minimum margin for beginners is to fly no lower than 150ft AGL and no slower than Best Glide Speed near a ridge. And given, there are several critical rules that must be observed while turning low near a ridge. I have made several clips in Condor to demonstrate both proper technique and the consequences of improper execution.
How to S-Turn Near the Ridge
When starting a turn, drop the nose, gain airspeed, and steepen up your bank.
The big themes when turning low are maintaining extra airspeed, good co-ordination, and spatial awareness of the mountain. We want to stay in the ridge band while maintaining adequate margin over stall. Remember, stalls are due to exceeding the critical angle of attack. You can exceed the critical AoA by steepening your bank and/or by slowing down. As a result, if you want to maintain a greater margin over stall you must let your speed increase as you increase your bank.
Remember to bank out of the turn early. The wind will want to drift you toward the ridge. You must start banking out well before then so that you have time to level out.
Avoid pulling up hard and banking at the same time.
This is the corollary to the previous point… many beginners tend to pull their nose up hard when entering a thermal and crank over into the turn. Halfway into the entry turn, their airspeed gets dangerously low and they mush or stall out. This is sub-optimal in a thermal at 3000ft, but it is absolutely unacceptable low near the trees; not only is the airspeed low, but the wing is loaded into the turn (high G). This is the perfect recipe for a spin entry.
How to (Properly) Thermal off the Ridge
When you approach a thermal, turn away from the ridge while maintaining good airspeed and co-ordination. Complete several S-turns to get at least 200ft, preferably 400ft above ridge top. At this point you could consider transitioning into a full turn and climbing away from the ridge.
Don’t Attempt a Full Turn Low!
Don’t turn low near the mountain! As you come around the turn, the mountain will come up at you really quickly and you will be exposed to a deadly trap. You will have high ground speed with low airspeed and experience “ground-rush” as the mountains comes up at you fast. The deadly trap is the desire to pull back to avoid hitting the ridge. This will stall the glider.
Don’t turn low. But if you find yourself in this situation, the ONLY way to escape is to steepen up your bank while dropping the nose. This will let you tuck away from the ridge and escape.
Don’t Turn Toward the Mountain!
Never, ever turn downwind toward the ridge. This is very dangerous and will near certainly drop you out of the turn on the far side. Even if you manage to complete the turn, you will have drifted far over the ridge and will have a long way to get back.
Spin on Thermal Entry
This reinforces all the previous points; maintain good airspeed, co-ordination, and spatial awareness when turning low near a ridge. Do not pull back and bank at the same time and mush out on the top part of the turn. One devastating trap is when you do this while entering a thermal. If you mush while at the top part of the turn after turning too early, there is a good chance you will encounter the “killer gust”.
What happens is as you go away from the core on the downwind side of the turn, you will be entering a zone of lift that gets weaker and weaker, until you’re finally in the sink. As you traverse that shear, it sucks the energy out of the glider.
The devastating consequence is that this occurs right as you are at the top part of the turn, very slow and the wing is loaded up. That killer gust will near certainly spin you out of the turn.
There is a much deeper discussion as to how and why shear works the way it does near mountains, which I will address in more detail some other time. The key point to remember is DO NOT turn early and hard into the thermal while bleeding off your airspeed; be ready for that sharp gust on the far side of the turn.
Here are a couple simple guidelines:
Maintain a minimum AT LEAST 150ft AGL and best glide speed while soaring the ridge.
ALWAYS turn AWAY from the ridge. (Ie: If the ridge is on your left, turn to the right.)
Complete S-turns or “dogbones” when 200ft AGL or lower near a ridge. 400ft is better.
When making turns, drop the nose a bit and gain airspeed.
Don’t bank and pull at the same time.
If you need to escape, bank steeper while speeding up. Don’t just pull back on the stick if the trees are coming up at you!