Small Aircraft; High Wing; 1 Eng; Fixed Gear
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 15; Flight Crew Total 5500; Flight Crew Type 1000
Situational Awareness; Confusion; Communication Breakdown; Time Pressure
Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Airport
After following two other landing aircraft in the traffic pattern I completed an uneventful; full stop landing on runway 14. I then taxied via the parallel taxiway back to the departure end of runway 14 for another take-off. Holding short of the runway I completed my pre takeoff checklist; visually cleared the area and announced my intentions to depart runway 14 on the CTAF at this non-towered airport. After hearing no other local traffic; and clearing the area once again; I taxied onto the active runway 14 and began a routine takeoff.  During climb out I saw another aircraft crossing in front of me; from right to left; in a climb which had apparently departed runway 7 at the same time. I passed behind and below the departing aircraft. No evasive action was taken by either aircraft and horizontal distance was at least 500 feet. Neither aircraft heard the other's radio calls and; knowing the operator of the other aircraft; I suspect that we may have inadvertently blocked each other's transmissions by transmitting at the same time. Another factor is that the departure ends of these two runways are not visible to each other on the ground and; possibly; 2-way radio communications may have also been impaired due to obstacles (Trees; buildings; vehicles; etc.) between us. At the time of the occurrence wind direction was about 10 from 170 with visibility unrestricted and scattered clouds around 3;000 feet. My flashing beacon and landing light were on.Suggestions for avoiding future situations like this would be for aircraft conducting cross-wind operations to make multiple calls (e.g. taxiing to the x-wind runway; departing the x-wind runway; etc.); encourage operators to avoid using x-wind/non-favored runways and; perhaps; to have the airport operator/FAA conduct some ground tests to see if adequate radio reception is always possible on the ground between the various departure ends of the different runways.
A pilot departed CTAF Runway 14 after making the required communications and had an encounter with a light twin which departed crossing Runway 7. Both pilots stated the required communications were made.