Narrative:

This was the first flight in this aircraft for both me and the student. I was acting as instructor and had previously done training with this student to get his tailwheel endorsement. Preflight inspection was normal and full control deflections were made to all control surfaces; no problems noted.takeoff was normal and airspeed was live; climb at 100 mph. Ten minutes into the flight we experienced what we thought was the autopilot coming on. The ailerons became very stiff and hard to move. We turned off the autopilot and wing leveler; also tried pulling the breaker on the autopilot. All those things had no effect. I also noticed that the aircraft was only indicating about 130 mph at 23 inches of map and 2500 RPM which seemed low for this type of aircraft. We were also having trouble communicating due to intercom problems.we decided to return to the airport immediately rather than do the flight maneuvers we had intended. It appeared that something was mechanically binding in the aileron control system.final was made at 90 mph indicated and short final at 80 mph. The airplane inadvertently stalled several feet off the runway and hit hard on the left gear causing damage.notes: I had flown once before in this model aircraft and found it to handle very similar to [the aircraft I own]; also the speeds around the pattern were very similar. I have over 500 hours of tailwheel and do tailwheel training in a citabria 7GCBC. The mustang ii is an experimental aircraft; 180 hp and cs prop. I knew beforehand that the stall characteristics of this airplane were unforgiving; sharp leading edge. I believe that if we had been able to do stalls and slow flight at altitude as planned that this incident would not have occurred.

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Original NASA ASRS Text

Title: Experimental aircraft instructor with student on first flight for both experiences aileron binding shortly after takeoff and elects to return for a precautionary landing. During the landing flare the aircraft is stalled just above the runway causing damage to the left main gear.

Narrative: This was the first flight in this aircraft for both me and the student. I was acting as instructor and had previously done training with this student to get his tailwheel endorsement. Preflight inspection was normal and full control deflections were made to all control surfaces; no problems noted.Takeoff was normal and airspeed was live; climb at 100 MPH. Ten minutes into the flight we experienced what we thought was the autopilot coming on. The ailerons became very stiff and hard to move. We turned off the autopilot and wing leveler; also tried pulling the breaker on the autopilot. All those things had no effect. I also noticed that the aircraft was only indicating about 130 MPH at 23 inches of MAP and 2500 RPM which seemed low for this type of aircraft. We were also having trouble communicating due to intercom problems.We decided to return to the airport immediately rather than do the flight maneuvers we had intended. It appeared that something was mechanically binding in the aileron control system.Final was made at 90 MPH indicated and short final at 80 MPH. The airplane inadvertently stalled several feet off the runway and hit hard on the left gear causing damage.Notes: I had flown once before in this model aircraft and found it to handle very similar to [the aircraft I own]; also the speeds around the pattern were very similar. I have over 500 hours of tailwheel and do tailwheel training in a Citabria 7GCBC. The Mustang II is an experimental aircraft; 180 HP and CS prop. I knew beforehand that the stall characteristics of this airplane were unforgiving; sharp leading edge. I believe that if we had been able to do stalls and slow flight at altitude as planned that this incident would not have occurred.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.