Nashville CFI
Eights on Pylons
- An advanced ground reference maneuver consisting of a figure eight around two selected ground reference points
- The goal is to keep pylons directly off lateral axis (usually wingtip), and NOT a uniform radius circle around them
- Pivotal altitude - altitude at which, at a given groundspeed, you can point wing at point on ground and airplane will appear to pivot around the point
- Pivotal altitude will change on different headings due to varying groundspeed
- Pivotal altitude in knots = (Ground speed)^2/11.3 (Bonanza = 130*130/11.3 = 1495)
- Pivotal altitude in mph = (Ground speed)^2/15
Eights on Pylons Howto
- Airspeed below Va (17 / 2400 in Bonanza)
- Fly the airplane in a downwind direction
- Select a pylon, preferably one in proximity to a road that stretches perpendicular to the downwind flightpath
- Turn 45° toward the pylon such that it will pass off the wing of your choice
- As you pass the first pylon, roll into a bank that places the wingtip on the pylon
- If the point moves forward of the wingtip, the yoke goes forward
- If the point moves back, the yoke goes back
- As you come around the pylon, select a second pylon and a visual reference point in front of the airplane that lines you up with it
- There should be 4-5 seconds of level flight between the two turns
- As the second pylon passes, roll into an opposite direction turn around it
- Divide attention and at 270° point be looking for reference to line up for first pylon and repeat
Common Mistakes
- Failure to clear area (including towers!)
- Poor selection of pylons
- Poor coordination in turns
- Failure to monitor airspeed during the maneuver
- Failure to select a site with a suitable emergency landing spot
- Over handling resulting in point going back and forth around wingtip
- Not entering downwind
- Inability to select proper pivotal altitude
- Incomplete first entry turn
ACS Test Standards
- Determines appropriate pivotal altitude
- Approx 30-40° bank at steepest point
- Divides attention outside and inside
- Holds pylon using appropriate pivotal altitude