Pietenpol-List: low speed lateral control (stall characteristics)
Posted: Sat Feb 18, 2006 9:01 am
Original Posted By: "gbowen(at)ptialaska.net"
Subject: Pietenpol-List: low speed lateral control (stall characteristics)Tim Willis and I have been discussing a few things off list and lately about washout. For all of you guys with flying Piets, 1) how much washout do you have?2) have you ever tried changing it any to see if handling is improved? I recently found an interesting article about the subject. (link below) It is a a NACA report done by engineers at Texas A&M in 1953 using washout tests on a Taylorcraft. (I have been trying to investigate to see if it was my Taylorcraft. It was owned by A&M at that time). Anyway - The tests looked atthe effects of washout and slots on lateral control near stall. The washout was varied from zero to 8 degrees. They used tufts all across the top surface of the wing to detect disturbed airflow. The idea is to have the inboard and center section of the wing stall first with the singtips still flying, so thatthe ailerons remain effective throughout the stall. I believe the NACA report conclusion was that 4 degrees washout was optimal for the taylorcraft and thus recommended for light planes.http://naca.larc.nasa.gov/reports/1953/ ... mbnail11It might be interesting to consider tests of such on the Piet wing to determine its optimum. Any thoughts?Terry B.________________________________________________________________________________
Subject: Pietenpol-List: low speed lateral control (stall characteristics)Tim Willis and I have been discussing a few things off list and lately about washout. For all of you guys with flying Piets, 1) how much washout do you have?2) have you ever tried changing it any to see if handling is improved? I recently found an interesting article about the subject. (link below) It is a a NACA report done by engineers at Texas A&M in 1953 using washout tests on a Taylorcraft. (I have been trying to investigate to see if it was my Taylorcraft. It was owned by A&M at that time). Anyway - The tests looked atthe effects of washout and slots on lateral control near stall. The washout was varied from zero to 8 degrees. They used tufts all across the top surface of the wing to detect disturbed airflow. The idea is to have the inboard and center section of the wing stall first with the singtips still flying, so thatthe ailerons remain effective throughout the stall. I believe the NACA report conclusion was that 4 degrees washout was optimal for the taylorcraft and thus recommended for light planes.http://naca.larc.nasa.gov/reports/1953/ ... mbnail11It might be interesting to consider tests of such on the Piet wing to determine its optimum. Any thoughts?Terry B.________________________________________________________________________________