Date: 201904
Local time of day: 1201-1800
Location: SPB.Airport, OR
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: Small Aircraft
Operator: Personal
Operating under: Part 91
Flight plan: None
Mission: Training
Flight phase: Takeoff / Launch
Airspace: Class G SPB
ATC / advisory: UNICOM SPB
Second aircraft: Small Aircraft
Reporter organization: Personal
Reporter function: Pilot Flying
Reporter qualification: Flight Crew Student
Human factors: Training / Qualification; Situational Awareness; Communication Breakdown
Second reporter function: Instructor; Pilot Not Flying
Anomaly: Conflict NMAC
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Took Evasive Action
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: My CFI and I were on a training flight in my airplane practicing short field take off and landings. We had been on sight at Scappoose Regional (SPB) with two other Cessna's in the pattern for about 25 minutes. The wind was calm and we were using Runway 15 as is local practice in calm conditions. As we were taxiing back to take off after our third landing; a pilot announced 'Over the river for 45 degree entry to Runway 33.' One of the Cessna's announced there are two others of us in the pattern and we are using Runway 15. The original announcer confirmed 15. As we were taxiing; I heard a call from a pilot announcing 'Two and a half miles out on left base for 33.' I am not sure if it was the same or a different airplane. My CFI and I talked about who and where that call came from it did not seem to make logical sense. We could not see the announcer's plane. After clearing for traffic; I announced from the hold short line; departing on Runway 15 and proceeded to roll for takeoff. At about 60 mph when I was ready to rotate; I could see a plane about 50-100 feet on short final for 33 coming right at me (Aircraft Y). My CFI said 'I have the airplane;' I confirmed; and he took control and rotated and immediately and turned right to be clear of the runway and continued to climb out. As this was occurring one of the Cessna's in the pattern asked where Aircraft Y was whereupon a pilot responded 'On short final for 33.'


Second narrative: Student Pilot and I had just completed a full stop landing on Runway 15 at SPB and were taxiing back for takeoff. While on the taxiway; we heard Aircraft Y on the CTAF announce their intention to enter a straight in for Runway 33 (right pattern is depicted on the chart for Runway 33). Another aircraft (tail number unknown) positioned at the Hold Short Line for Runway 15 announced that multiple aircraft were using Runway 15 and they taxied onto Runway 15 and departed. While still on the taxiway; we heard Aircraft Y on the CTAF announce their intention to enter a left base for Runway 33. As we approached the Hold Short Line for Runway 15 we cleared for traffic; announced our intention to takeoff on Runway 15; and lined up on Runway 15. During our takeoff roll; another aircraft requested the position of Aircraft Y who announced that they were on Short Final for Runway 33. We noticed them at the same time as our rotation; cleaned up the airplane and steered to the right to offset ourselves from the runway. We passed abeam Aircraft Y at the departure end of Runway 15 with about 300 feet separation. Aircraft Y executed a full stop landing on Runway 33.


Synopsis: Instructor pilot and student pilot reported a NMAC while departing with opposite direction arrival.