C172 reported taking evasive action to avoid a midair collision departing 39N airport.

Attributes
ACN	1501091
Time
Date	201712
Local Time Of Day	1201-1800
Place
Locale Reference	39N.Airport
State Reference	NJ
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	None
Aircraft 2
Make Model Name	M-20 S Eagle
Operating Under FAR Part	Part 91
Flight Phase	Climb
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 12 Flight Crew Total 1350 Flight Crew Type 700
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 500 Vertical 0

Narrative:

I was cruising eastbound; just south of 39N; at 2;800 ft. I watched on ads as [a mooney] departed runway 28 at 39N and entered a climbing left turn. The aircraft was behind me; and much faster than my C172. The plane leveled at 2;800 ft; headed directly toward me and a mile behind me. At that moment; ny center said 'traffic six o'clock; same direction and altitude; fast-moving.' I performed a chandelle to get out of the way of the other aircraft; which never changed course; altitude or speed. I have ads-B out and in; and it has been verified. Since the other aircraft obviously had ads-B out; I assume it had the in function as well. There was no way I would have avoided a collision; even with ATC warning; if I did not see for myself how immediate the threat was. I can easily believe that a plane overtaking a 172 from behind would have very little cross-section to see visually; but how did they not glance at their own ads-B? I'm really puzzled. If we buy these things and don't use them; what's the purpose of having them?

Original NASA ASRS Text

Title: C172 reported taking evasive action to avoid a midair collision departing 39N airport.

Narrative: I was cruising eastbound; just south of 39N; at 2;800 ft. I watched on ADS as [a Mooney] departed Runway 28 at 39N and entered a climbing left turn. The aircraft was behind me; and much faster than my C172. The plane leveled at 2;800 ft; headed directly toward me and a mile behind me. At that moment; NY Center said 'traffic six o'clock; same direction and altitude; fast-moving.' I performed a chandelle to get out of the way of the other aircraft; which never changed course; altitude or speed. I have ADS-B OUT and IN; and it has been verified. Since the other aircraft obviously had ADS-B OUT; I assume it had the IN function as well. There was no way I would have avoided a collision; even with ATC warning; if I did not see for myself how immediate the threat was. I can easily believe that a plane overtaking a 172 from behind would have very little cross-section to see visually; but how did they not glance at their own ADS-B? I'm really puzzled. If we buy these things and don't use them; what's the purpose of having them?

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.