Yankee AA1
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 18; Flight Crew Total 3100; Flight Crew Type 1635
Confusion; Situational Awareness; Communication Breakdown
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Human Factors; Procedure
While loading my plane at ZZZ I noticed the wind was favoring runway XX. My daughter noted that the wind sock was also favoring runway XX. As I announced my departure from runway XX I heard a faint XY" on [frequency] XXX.YY. I stopped and asked if anyone was taking off on XY. Then I saw a high wing plane taking off on XY. Then again announced my departure on XY. Note: you cannot see end to end on this runway at ZZZ. Upon taking off I found a low wing plane departing from XY. We were both airborne. Fortunately we both broke to our right at the same time. Wondering if I missed something about wind direction I turned up the volume on YYY.ZZ and found the wind to be still 050 at 3 knots. As to the operation of my radio it worked fine talking to four different ATC facilities on the way home. For ZZZ I would recommend a camera and TV screen at each end so you can see what's at each end. Don't know if you could aim one on the approach for landing plane. Don't know how you would fix downwind takeoffs. Well downwind take offs are not prohibited I think you should put the odds on your side should you have engine failure during the takeoff phase of flight."
Pilot reported taking evasive action on take off when another aircraft departed on the opposing runway.