GA pilot reported taking evasive action for an near midair collision with a helicopter during climb ...

Narrative:

I departed mcclellan airport (mcc) runway 34. I took off and flew runway heading. The airport is an ex-military field with a rather long runway because of this I waited until I got to pattern altitude before turning crosswind which would give me proper displacement in the traffic pattern. At the departure end I started a gradual left crosswind turn. I had heard a helicopter making traffic calls on the radio on a left downwind leg for runway 34. I did not have visual contact with the helicopter when I took off. As I started the left crosswind leg; I got a visual contact with the helicopter low and to my left with about 400 feet vertical separation and about 100 feet horizontal separation. I pulled the nose up abruptly for separation which caused me to pop through the floor of the overlying class C airspace which is 1;600 feet. I reached a maximum altitude of 2;000 feet MSL and I immediately pushed the nose down to get back down out of the class C airspace. Total time of the altitude deviation was less than 30 seconds. Mcc is uncontrolled and I wasn't talking to ATC. I exited the area to the southeast and then had to immediately climb above 2;600 feet MSL to avoid mather's (mhr) class D airspace which is nearby. I should have reviewed the altitudes of the class C again before departure. I should have exited the pattern with a right turn and cleared the pattern and class C sooner. The traffic conflict in the pattern made the only option was to climb and that put me at risk for an altitude deviation. I deviated in the interest of safety and corrected as quickly as possible.

Original NASA ASRS Text

Title: GA pilot reported taking evasive action for an NMAC with a helicopter during climb from MCC Airport resulted in an airspace violation.

Narrative: I departed McClellan airport (MCC) Runway 34. I took off and flew runway heading. The airport is an ex-military field with a rather long runway because of this I waited until I got to pattern altitude before turning crosswind which would give me proper displacement in the traffic pattern. At the departure end I started a gradual left crosswind turn. I had heard a helicopter making traffic calls on the radio on a left downwind leg for Runway 34. I did not have visual contact with the helicopter when I took off. As I started the left crosswind leg; I got a visual contact with the helicopter low and to my left with about 400 feet vertical separation and about 100 feet horizontal separation. I pulled the nose up abruptly for separation which caused me to pop through the floor of the overlying class C airspace which is 1;600 feet. I reached a maximum altitude of 2;000 feet MSL and I immediately pushed the nose down to get back down out of the Class C airspace. Total time of the altitude deviation was less than 30 seconds. MCC is uncontrolled and I wasn't talking to ATC. I exited the area to the southeast and then had to immediately climb above 2;600 feet MSL to avoid Mather's (MHR) Class D airspace which is nearby. I should have reviewed the altitudes of the Class C again before departure. I should have exited the pattern with a right turn and cleared the pattern and Class C sooner. The traffic conflict in the pattern made the only option was to climb and that put me at risk for an altitude deviation. I deviated in the interest of safety and corrected 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.

Attributes
ACN	1603451
Time
Date	201812
Local Time Of Day	1201-1800
Place
Locale Reference	MCC.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	Direct
Flight Plan	None
Aircraft 2
Make Model Name	Helicopter
Flight Phase	Final Approach
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 23 Flight Crew Total 2930 Flight Crew Type 400
Events
Anomaly	Airspace Violation All Types Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 100 Vertical 400

GA pilot reported taking evasive action for an near midair collision with a helicopter during climb from mcc airport resulted in an airspace violation.