SGS 2-33 training glider at Atlantic Soaring Club
This inspirational soaring video makes me wish for infinite time and money.
Even as I embark on my aerobatics adventure I wonder if I’ve chosen well. I was happily working on my glider certification when I fell into my current obsession with aerobatics. Flying/owning gliders, and soaring as a sport, is generally considered less expensive than powered flight and aerobatics. Financially, I can’t manage both powered aerobatics and soaring now. Time-wise, I’m not sure I ever will. But boy is it fun to dream about.
If Balleka’s soaring video doesn’t get you excited you’re not interested in flying. It’s ok if you’re one of those, but I will admit to not understanding you. 🙂
Balleka has published some excellently flown and edited soaring videos that will be well worth the hour-plus you’re likely going to get sucked into watching. Thanks Balleka!
p.s. Great views in here of the Exmoor coast Cornwall England, the Alps, and for cycling fans the famous Tour de France climb Mont Ventoux.
The Hammerhead Turn is a fun maneuver. It’s a challenging combination of all three planes of motion, plus the fourth dimension of time: there are two quarter loop components to pull in pitch changes courtesy of the elevator, a roll component (to counteract torque at low airspeed and asymmetrical lift) to exercise aileron control, and of course the yaw component where we get to kick the rudder to turn around at the top. Plus it gets us close to the zero airspeed regime.
There is more going on here than I can keep track of now. For the moment the important parts are the pull up, the yaw turn around the top, and the pull out. Eventually I need to add these parts:
- Consistently hold the 4g pull from level to vertical
- Timing the turn around. Done correctly, the airplane pivots around its center of mass in less than a wingspan. Too early leaves the airspeed too high and the airplane “flies” through a wingover, instead of pivoting. Too late and it falls backward into a sloppy tailslide.
- Find the exact mix of right- and then forward-stick to keep the turnaround in the same vertical plane. The outside wing is traveling faster so it’s generating more lift, than the inside wing, which results in left-rolling tendency that is counteracted with right-stick. Forward-stick counters the gyroscopic force from the spinning propeller trying to pull the nose up.
- Timing the turn stop. Without right-rudder the nose will swing through the bottom, past vertical. The engine and propeller make an effective pendulum weight.
- Timing the vertical down-line and nailing the 4g pull-out to finish on target in both airspeed and altitude.
It looks so easy from the ground!
Here is video evidence of my first attempts…preserved for all time (at least until electrons are obsolete). I hope to look back at this clip 5000 hammerheads from now and shake my head at how anemic my skills used to be.
Part of my journey into aerobatics includes Spin Training. Spins
are the downward spiraling flight airplanes go into when the wing stalls (i.e. stops producing lift) without coordinated rudder input to keep them level. Spins are a required part of aerobatic competition. Accidental spins are associated with a great many aviation accidents. One would think they’d be integral to pilot training. And they are…sort of. We’re taught about them including the aerodynamics involved, recognition & avoidance, and the control actions to recover. But actually doing spins is no longer required by the U.S. Federal Aviation Regulations to be a certified pilot. We talk about them, get tested on them, but don’t actually do them. We’re required to perform stalls (the wings must be stalled before a spin can occur) but only just the onset of the stall, before recovering to normal flight.
I won’t go into the great debate here but the teaching of spins is the aviation equivalent of religion or politics (or even worse: the pc-mac debate!): everyone has an opinion and they are mostly strong and very likely to run the entire gamut. There are those for whom the spin is the modern equivalent of the flat earth: a fear born of uncertainty and a place best left unexplored. It takes all kinds but in their defense, spins are perhaps the least understood of basic aerodynamic phenomena and have been for over a hundred years.
For aerobatics, spins are required in all their flavors. But for the moment I don’t want to talk about spins; I want to talk about ’emergency recovery’ from accidental spins.
Part of trying new things is the certainty we will fail regularly and often. In trying new aerobatic maneuvers, one likely outcome of failure is simply falling out of the maneuver and into a spin. We practice with lots of altitude so recovery is easy, until we can perform the maneuver perfectly every time. This mastery is what allows airshow performers to dazzle us safely and consistently. Every second of their performance is only made possible by thousands of hours of preparation.
During the journey toward that mastery, we need to prepare to fail. That’s where emergency recovery training is worth its weight in gold-wrapped diamonds set in Californium-252.
Bill Finagin teaches a variation of the Mueller-Beggs recovery.
It goes like this:
- Rip the power off
- Forcefully neutralize (center) stick and rudder
- Wait for 100mph (in the Pitts)
- Pull out of the dive
The main points are:
- Recognizing when we’re out of control
- Performing the steps in order, with authority, while saying them aloud
The main advantages:
- Does not burn a lot of extra altitude compared to traditional recovery techniques
- No need for the pilot to know the direction of spin
- No possibility of making the spin worse (e.g. recovery inputs held too long inducing a crossover spin to/from inverted)
My primary flight instructor did a good job of making me not fear the spin 20 years ago, but I never knew how fun they (and emergency recovery training) can be. My understanding at this point is basic and growing. My confidence is growing by leaps and bounds!
I wrote about the rudder walk exercise a while ago and tried to explain what’s involved and how challenging it is for me.
Now I have some video to go with it, but the video isn’t that exciting until you realize a few things:
- The airplane isn’t flying; it’s falling
- The wings are generating no practical lift
- We’re holding the airplane in a full stall with the stick all the way back
- The only thing keeping the wings even close to level is my tiny rudder changes. That’s what Bill is referring to when he talks about “input” and “pressure”.
- Airspeed is somewhere just under 60mph; we’re normally zipping around at 150mph
- The beeping is the stall warning indicator
- Descent rate is ~3400 ft/minute. (Maybe more accurately termed “free-fall rate”.)
It was a beautiful day for flying and Bill and I both had open schedules so we flew a long time, including airwork and pattern work/landings at Cambridge and Easton. It was New Years Eve and no one else was flying; even Potomac Approach (the Baltimore-Washington International control frequencies) was quiet.
This rudder walk and the simulated engine failure were the start of our flight. I’ll post some other video snippets soon.
I’m getting better! And loving every minute of the challenge.
We just happened (not an accident, I’m sure) to finish the rudder walk near a small airport (Ridgely) where Bill felt the most appropriate celebration was a nice simulated engine failure exercise. This amounts to pulling the power to idle and working through handling the emergency and setting up a power-off landing. I didn’t do it perfectly but it would probably have been a successful landing.
It happened. My mind is blown and I am officially in karma-debt: I’m the proud owner of a beautiful Pitts Special S-1S aerobatic biplane.
Here’s a laundry list of reasons this situation is seriously taxing my karma. I couldn’t have dreamed it any better:
- It’s a beautiful, extremely well-cared-for airplane
- It’s been based at my local airport (Lee-KANP Annapolis, MD) for 13 years
- It’s in a hangar with three other Pitts, all S-2’s, owned by experienced Pitts pilots, who’ve all been extremely generous with their time and experience
- The hangar is .5nm from my house
- The hangar is next to Bill Finagin (in fact Bill owns both hangars and we rent from him)
- Bill is a rare and valuable resource by himself, having 5 other Pitts hangared feet away is amazing
- Karen took excellent care of the airplane and has been very generous with her time and experience in answering questions
- Knowing the previous owner and other pilots who’ve known the airplane for thirteen years, including the mechanic who has done all the work, is extremely comforting and a very rare thing when buying an airplane
- It was factory re-covered and extensively refreshed eighteen months ago
In my wildest dream the plan was to maybe hope to start looking for an airplane in late 2014. I’m so far ahead of plan I’m completely overwhelmed in the best possible way.
I’m not even ready to fly it yet. I have my tailwheel endorsement (but only 15 hours total tailwheel) and a few more Pitts-transition hours with Bill and I’m almost ready. I’m also dedicating the time and money for Bill’s Spin & Emergency Recovery course. I consider it required training and the best insurance available, not to mention just plain fun.
In the mean time I have a few small projects I can work on.
- Replacing the flat wooden seat pan with an aluminum sling similar to the production builds. I’ll go with a seat-pack chute to get back far enough to get my knees out of the panel and the new seat pan should get me down another inch or so.
- Order a Quiet Technologies Halo in-the-ear headset which will give me a bunch more headroom compared to the Telex Stratus 50D behemoth earcup ANR.
- New vinyl lettering to apply to the cockpit panels.
- It was already in beautiful condition so I’m cleaning, polishing, and waxing now so when I’m ready to fly I can concentrate on the flying for a few months.
It was homebuilt in 1993 and I’m the third real owner, including the builder.
If it’s not clear let me reiterate; I can’t believe my good fortune and I plan to make good use of it. I’m not so much an owner as I am the current custodian. (Please god don’t let me do anything stupid. I don’t underestimate my capacity for stupid.)
Click here for a Pitts S-1S Overview (courtesy of Aviat Aircraft)
||180 HP Lycoming IO-360
||850 ± pounds
||300 ± pounds
||120 pounds (20 US gallons)
||15 pounds (8 quarts)
||15 feet 6 inches
||17 feet 4 inches
||98.5 square feet
|Rate of Climb
|Rate of Rolll
||± 300 miles
The first 4,000,000 digits of Pi, visualized in a single image
Courtesy of io9
Practically, one needs only 39 digits of pi to make a circle the size of the observable universe accurate to the size of a hydrogen atom. –http://two-n.com/pi/