An RNAV Approach at Walla Walla

Here’s video of the RNAV (GPS) RWY 20 approach at Walla Walla, WA (KALW). Because my A36 Bonanza is equipped with WAAS-capable Garmin GTN 750, I can fly to the ILS-like LPV (localizer performance with vertical guidance) minimums. Given the choice between an ILS and an RNAV procedure with LPV minimums, I usually choose the RNAV approach. It’s easier to set up with no CDI switching required.


Aerobatics with Data

Here’s a look at an aerobatic ride with data from a Garmin VIRB Ultra 30 camera’s sensors overlaid. The GPS-based position, speed, and altitude don’t match the information from cockpit instruments precisely, and the sensors sometimes can’t keep up with the dynamics of aerobatics, but the data do give you an idea of how quickly things change during aerobatics. We also had a tailwind of about 6 knots during the landing, so the GPS-derived groundspeed is higher than the indicated airspeed during the approach and landing.

It’s also worth noting that during aerobatic rides I try to fly smoothly and keep the Gs under control. Rides aren’t aerobatic contests or airshows.

To display the data in a video, I first import the video and corresponding data into the free Garmin VIRB Edit program. After choosing the gauges to display, I export the video and do the final editing in Adobe Premiere Elements.

Aerobatic Ride on a Summer Morning

Flying the Extra: Seattle to Las Vegas

Each year around the end of September, I fly the Extra 300L from Boeing Field (KBFI) in Seattle to its winter base at Boulder City, NV (KBVU) outside Las Vegas. The video below shows highlights from the flight this year. Enjoy the dramatic changes in the landscape from the well-watered Puget Sound region to the desolate desert in southern Nevada.

BruceAir-Extra-009.jpgPhoto: Felix Knaack

The Extra isn’t designed for long-distance journeys, and I have to make two fuel stops to complete the journey of about 900 nm (1670 km). I usually stop at Bend, OR (KBDN) and Yerrington, NV (O43). The flight itself typically requires 5.5 – 6.0 hours; with the two stops the total block time is usually about 8 hours.

You can view the route that I flew at here.

Stalls at “Any Attitude, Any Airspeed”

Every pilot learns that a wing can stall “in any attitude and at any airspeed.”

But it’s difficult to demonstrate that principle in a typical training aircraft. This video of an exercise that I do with my stall/spin/upset recovery students shows the value of training in an aerobatic aircraft.

I fly a basic loop, but at several points during the maneuver, I intentionally increase the angle of attack by pulling back abruptly on the stick. Each time I pull, the angle of attack quickly reaches the critical angle of attack, and the airplane shudders in an accelerated stall, regardless of the airplane’s airspeed or pitch attitude relative to the horizon.

In other words, you can change the airplane’s attitude (and its angle of attack) almost instantly, but changing its flight path requires more time. That difference between the attitude and the flight path is angle of attack, and when that angle exceeds the wing’s critical angle of attack, the wing stalls.

It’s also helpful to remember that a loop is just a vertical turn. The same principle applies when you bank the wings and turn an airplane in the horizontal plane. If you pull back on the yoke or stick during a turn, you increase the angle of attack. Pull back too aggressively, and the wing will reach its critical angle of attack and stall, regardless of the indicated airspeed.

Simulated Wake-Turbulence Encounter

I do the exercise below with my stall/spin/upset students to simulate the disorienting effect of a wake-turbulence encounter. We perform 1-1/2 aileron rolls to inverted and then push and roll to recover to normal upright flight. The exercise is confusing at first, and the nose always drops well below the horizon during the “upset.” It’s a great way to help pilots understand what could happen if they were caught in a wintip vortex.

Wake turbulence caused by wingtip vortices is major hazard to small aircraft.


The wingtip vortices are a by-product of lift. You can find detailed information about wake turbulence in FAA Advisory Circular AC 90-23 and in the Aeronautical Information Manual (Chapter 7, Safety of Flight; Section 3, Wake Turbulence).




Taking the Extra 300L for a Spin

Here’s a basic intentional spin in the Extra 300L. The camera shows the instruments in the front cockpit. Note the airspeed during the spin.