Narrative:

After listening to the ATIS and determining the winds were calm; I taxied to runway 25R via alpha. The CTAF at that time indicated an aircraft was approaching from the north. No other traffic was heard and a visual inspection of the airport grounds did not reveal any other aircraft. After holding short of 25R momentarily for a second audio & visual inspection of the surrounding area; I called out and took off on runway 25R. At the departure end of 25R; I noticed aircraft Y ([a] training aircraft) rotate and lift off of runway 7R in the opposite direction. I was higher than aircraft Y and initiated my turn to the north away from aircraft Y per the DVT1 instrument departure at this time (right turn out). There was vertical and horizontal separation at all times; but it was obvious that near-simultaneous departures from opposite parallel runways reduced the margin of safety and was not ideal.in this instance; visual and CTAF monitoring on 118.4 did not work effectively. The rising sun further complicated visual recognition due to glare from buildings and the surrounding environment. I had no issues communicating with departure or approach on both radios in my aircraft and the volume was turned up audibly on both radios. So; I am unsure if the other aircraft were making radio calls or if my aircraft did not receive them. Furthermore; a calm wind runway was not designated in the airport facility directory. I believe this situation could also have been avoided in the future by designating a calm wind runway in the airport facility directory so all aircraft use the same runway.

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Original NASA ASRS Text

Title: Baron 55 pilot reported an airborne conflict after taking off from DVT on Runway 25R and spotting an unannounced aircraft taking off from 7R.

Narrative: After listening to the ATIS and determining the winds were calm; I taxied to Runway 25R via Alpha. The CTAF at that time indicated an aircraft was approaching from the north. No other traffic was heard and a visual inspection of the airport grounds did not reveal any other aircraft. After holding short of 25R momentarily for a second audio & visual inspection of the surrounding area; I called out and took off on runway 25R. At the departure end of 25R; I noticed Aircraft Y ([a] training aircraft) rotate and lift off of Runway 7R in the opposite direction. I was higher than Aircraft Y and initiated my turn to the north away from Aircraft Y per the DVT1 instrument departure at this time (right turn out). There was vertical and horizontal separation at all times; but it was obvious that near-simultaneous departures from opposite parallel runways reduced the margin of safety and was not ideal.In this instance; visual and CTAF monitoring on 118.4 did not work effectively. The rising sun further complicated visual recognition due to glare from buildings and the surrounding environment. I had no issues communicating with departure or approach on both radios in my aircraft and the volume was turned up audibly on both radios. So; I am unsure if the other aircraft were making radio calls or if my aircraft did not receive them. Furthermore; a calm wind runway was not designated in the Airport Facility Directory. I believe this situation could also have been avoided in the future by designating a calm wind runway in the airport facility directory so all aircraft use the same runway.

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.