Small Aircraft; High Wing; 1 Eng; Fixed Gear
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 150; Flight Crew Total 1278; Flight Crew Type 50
Confusion; Communication Breakdown
ATC Issue All Types; Conflict NMAC; Deviation - Track / Heading All Types
Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Airport; Human Factors; Procedure
We were cleared for takeoff on Runway 17L from Centennial; and instructed to fly straight out. Before we were even airborne the Local 1 Controller cleared a light twin for takeoff and also told them to fly straight out/runway heading. I was watching the aircraft on my ADS-B traffic display and saw them approaching us from the rear at high speed. Tower instructed me to turn right and proceed on course; and I responded 'unable' as there was an aircraft passing me on the right. I was taking evasive action and turning to the left away from the conflict. The Tower Controller had no idea about the proximity of the two aircraft. I don't believe proper spacing was given between both of us for takeoff; and tower absolutely lost separation between the two aircraft. A thorough review of Centennial towers air traffic procedures is a must. Near misses in similar situations are a regular occurrences at this airport and many are not reported.
GA flight instructor reported a near miss with a subsequent light twin aircraft departing APA. ATC's right turn instructions were ignored because of the overtaking aircraft.