Narrative:

Uncontrolled field; unicom frequency. Runway xx in use; 2 other aircraft announcing in the pattern. One landed; the other; a C-172 was turning base leg. Heard no other aircraft announce; scanned final approach area; saw no aircraft; so entered runway to begin take off. Just as takeoff roll commenced; heard heavily accented voice on unicom saying something like don't take off. No aircraft identification or position was stated. Saw nothing in front of me on the runway or in view; so continued take off. Heard same voice saying something like; on final; but no aircraft identification or airport and runway identification. Cannot see behind me and cannot tell anything about voice; so continued take off. Just as lifting off and clearing end of runway; saw a small low wing aircraft pass off my right at a higher speed. It continued to parallel me until turning left across my nose; barely climbing. It appeared to be some type of homebuilt; low wing; small and faster than me. Never heard that aircraft make any position reports in the pattern; and did not see it while scanning prior to entering the runway. Cannot avoid what you don't hear or see; and cannot determine much from a general statement on the frequency; with no identification or position. Other airports in the area with same unicom frequency and aircraft can be heard at those airports; so unless a pilot identifies his airport location; it's impossible to know where they are. Lesson; be as vigilant as possible at an uncontrolled field; and hope other aircraft in the pattern; announce themselves properly. Not sure how to avoid what you don't hear or see. The other pilot should not have continued down the runway at a high speed and low attitude so close to a departing aircraft. If they see a conflict in front of them; it's easy to perform a go around and not continue to fly toward another aircraft. The departing aircraft cannot see behind it; and the pilot cannot make decisions on not knowing what is happening with other aircraft not announcing their identification; position and intentions.

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Original NASA ASRS Text

Title: C182 Pilot reported a Near Mid Air Collision while departing a Non-Towered airport due to conflict traffic aircraft not following standard UNICOM radio procedures.

Narrative: Uncontrolled field; UNICOM frequency. Runway XX in use; 2 other aircraft announcing in the pattern. One landed; the other; a C-172 was turning base leg. Heard no other aircraft announce; scanned final approach area; saw no aircraft; so entered runway to begin take off. Just as takeoff roll commenced; heard heavily accented voice on UNICOM saying something like don't take off. No aircraft ID or position was stated. Saw nothing in front of me on the runway or in view; so continued take off. Heard same voice saying something like; on final; but no aircraft ID or airport and runway ID. Cannot see behind me and cannot tell anything about voice; so continued take off. Just as lifting off and clearing end of runway; saw a small low wing aircraft pass off my right at a higher speed. It continued to parallel me until turning left across my nose; barely climbing. It appeared to be some type of homebuilt; low wing; small and faster than me. Never heard that aircraft make any position reports in the pattern; and did not see it while scanning prior to entering the runway. Cannot avoid what you don't hear or see; and cannot determine much from a general statement on the frequency; with no ID or position. Other airports in the area with same UNICOM frequency and aircraft can be heard at those airports; so unless a pilot identifies his airport location; it's impossible to know where they are. Lesson; be as vigilant as possible at an uncontrolled field; and hope other aircraft in the pattern; announce themselves properly. Not sure how to avoid what you don't hear or see. The other pilot should not have continued down the runway at a high speed and low attitude so close to a departing aircraft. If they see a conflict in front of them; it's easy to perform a go around and not continue to fly toward another aircraft. The departing aircraft cannot see behind it; and the pilot cannot make decisions on not knowing what is happening with other aircraft not announcing their ID; position and intentions.

Data retrieved from NASA's ASRS site 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.