Narrative:

While departing mcc on an IFR clearance; we waited for a VFR king air to land and clear the runway. Once he announced he was clear we announced on CTAF we were departing runway 16; straight out. Observing our arrival and departure corridors to be clear of traffic; I positioned the aircraft on the centerline at the end of the runway; held brakes and began advancing power. At that moment I heard 'mcclellan traffic; rv departing 16 at kilo.' I observed a small van's kitbuilt airplane entering the runway downfield at kilo intersection. I reduced power to idle and told him on the radio we were departing runway 16 and asked if he saw us. No reply. I began taxiing clear of the runway; calling him two more times to ask if he saw or heard us. No reply. Once he was airborne; I called him again. This time he responded. I told him he took off in front of us; and caused a runway incursion. He sounded unapologetic; explaining that he never saw us or heard us. That was the end of our conversation. Once he was clear; we resumed our takeoff.mcclellan has a slight rise between the runway ends. I suspect his aircraft; being very small and low to the ground; was far enough away from us (approximately 7;000' down the runway) so as to have a difficult time seeing us - but we could see him. Furthermore; we were on Comm1 using our bottom antenna. I suspect his antenna may also have been bottom mounted; thus he may not have heard us until he was airborne. By runway incursion categories; I rate this as a cat C: 'an incident characterized by ample time and or distance to avoid a collision.'due to mcclellan's long runway; intersection takeoffs are not uncommon; particularly from light GA aircraft using the self-service fuel island on the southwest side of the field. However; normal and heavy operators almost always use full runway length. I believe the pilot of [the van's] did not sufficiently clear the runway prior to taking off. We had all of our landing/recognition lights on and made a radio call prior to taxiing onto the runway - we should have been very visible to him. Once it was obvious to me he either could not see/hear us or was choosing to ignore us; I aborted my takeoff and removed us from the runway as quickly as possible.

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Original NASA ASRS Text

Title: BE-20 pilot reported he exited the runway to avoid a conflict with a light aircraft that took the runway without being aware of the BE-20.

Narrative: While departing MCC on an IFR clearance; we waited for a VFR King Air to land and clear the runway. Once he announced he was clear we announced on CTAF we were departing Runway 16; straight out. Observing our arrival and departure corridors to be clear of traffic; I positioned the aircraft on the centerline at the end of the runway; held brakes and began advancing power. At that moment I heard 'McClellan Traffic; RV departing 16 at Kilo.' I observed a small Van's kitbuilt airplane entering the runway downfield at Kilo intersection. I reduced power to idle and told him on the radio we were departing runway 16 and asked if he saw us. No reply. I began taxiing clear of the runway; calling him two more times to ask if he saw or heard us. No reply. Once he was airborne; I called him again. This time he responded. I told him he took off in front of us; and caused a runway incursion. He sounded unapologetic; explaining that he never saw us or heard us. That was the end of our conversation. Once he was clear; we resumed our takeoff.McClellan has a slight rise between the runway ends. I suspect his aircraft; being very small and low to the ground; was far enough away from us (approximately 7;000' down the runway) so as to have a difficult time seeing us - but we could see him. Furthermore; we were on Comm1 using our bottom antenna. I suspect his antenna may also have been bottom mounted; thus he may not have heard us until he was airborne. By Runway Incursion categories; I rate this as a Cat C: 'an incident characterized by ample time and or distance to avoid a collision.'Due to McClellan's long runway; intersection takeoffs are not uncommon; particularly from light GA aircraft using the self-service fuel island on the SW side of the field. However; normal and heavy operators almost always use full runway length. I believe the pilot of [the Van's] did not sufficiently clear the runway prior to taking off. We had all of our landing/recognition lights on and made a radio call prior to taxiing onto the runway - we should have been very visible to him. Once it was obvious to me he either could not see/hear us or was choosing to ignore us; I aborted my takeoff and removed us from the runway as quickly as possible.

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.