Narrative:

The weather was clear with good visibility. The winds were primarily out of the south. There was light turbulence with occasional strong areas of thermal activity noted. I crossed mid-field at 1;100 MSL to check the wind sock. It indicated the winds were out of the south. I entered a left downwind for landing runway 17. There was turbulence noted in the pattern and on short final.after clearing the trees on the approach end of 17; at 60 mph IAS; I placed the plane into a left forward slip. At approximately 20 ft AGL I felt the descent rate dramatically increase. It just felt like the bottom fell out. I applied full power and at the same time aligned the plane with the runway (taking it out of the forward slip). The engine shuttered/stumbled momentarily and failed to make immediate power. The engine began making power just as the plane impacted the ground.the airplane touched down in a nose low attitude; collapsing the nose gear and causing the prop to strike the ground. It came to rest in the middle of the turf runway; about one-half way down the runway. I shut the engine down; turned off the electrical and closed the fuel valves. There was no fuel leakage. My passenger and I exited the plane. There were no personal/physical injuries noted at the time. The plane was removed from the runway (towed on its on gear) and moved inside the hangar to its normal location where it was secured. Damage appears to be limited to the tips of the propeller and a bent nose gear.an eye witness (pilot) on the ground; standing near the windsock; stated that the wind changed direction (from the south; to out of the north) as I was beginning my forward slip. He also stated that he heard the engine bog down for just a second or two before revving up. Based on his observation of the change in wind direction and light turbulence that was prevalent; I believe these factors caused a sudden decrease in my airspeed causing me to lose altitude rapidly. Due to my close proximity to the ground there was not adequate time available for the engine to develop additional power to arrest the descent. In addition; it's possible my rapid application of the throttle was probably what caused the engine to bog down momentarily. For future reference; I will carry a little extra speed on short final when turbulence is present.

Google
 

Original NASA ASRS Text

Title: The pilot of an amateur homebuilt carried a forward slip deep into the approach and was unable to recover from an unanticipated loss of airspeed and altitude prior to impact which collapsed the nose gear and resulted in propeller damage.

Narrative: The weather was clear with good visibility. The winds were primarily out of the south. There was light turbulence with occasional strong areas of thermal activity noted. I crossed mid-field at 1;100 MSL to check the wind sock. It indicated the winds were out of the south. I entered a left downwind for landing Runway 17. There was turbulence noted in the pattern and on short final.After clearing the trees on the approach end of 17; at 60 MPH IAS; I placed the plane into a left forward slip. At approximately 20 FT AGL I felt the descent rate dramatically increase. It just felt like the bottom fell out. I applied full power and at the same time aligned the plane with the runway (taking it out of the forward slip). The engine shuttered/stumbled momentarily and failed to make immediate power. The engine began making power just as the plane impacted the ground.The airplane touched down in a nose low attitude; collapsing the nose gear and causing the prop to strike the ground. It came to rest in the middle of the turf runway; about one-half way down the runway. I shut the engine down; turned off the electrical and closed the fuel valves. There was no fuel leakage. My passenger and I exited the plane. There were no personal/physical injuries noted at the time. The plane was removed from the runway (towed on its on gear) and moved inside the hangar to its normal location where it was secured. Damage appears to be limited to the tips of the propeller and a bent nose gear.An eye witness (pilot) on the ground; standing near the windsock; stated that the wind changed direction (from the south; to out of the north) as I was beginning my forward slip. He also stated that he heard the engine bog down for just a second or two before revving up. Based on his observation of the change in wind direction and light turbulence that was prevalent; I believe these factors caused a sudden decrease in my airspeed causing me to lose altitude rapidly. Due to my close proximity to the ground there was not adequate time available for the engine to develop additional power to arrest the descent. In addition; it's possible my rapid application of the throttle was probably what caused the engine to bog down momentarily. For future reference; I will carry a little extra speed on short final when turbulence is present.

Data retrieved from NASA's ASRS site as of April 2012 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.