Narrative:

Dro runway 20 and runway 2. Runway 20 has a downhill grade of about 1%. Winds calm, WX cavu. Departing with nightly scheduled C208 freight flight at maximum gross weight. PA24 had just departed runway 2 and was making left crosswind. PA28 calling himself 'warrior north (unknown)' reported left downwind for runway 2. I called that I was departing runway 20 and that I had the 'cherokee' in sight. I expedited the left crosswind turn and was heading perpendicular to the runway centerline prior to seeing any turn by the PA28. At that time, I saw him turn right out of the downwind. About 15 seconds later I heard him transmit something like he was exiting the pattern and was going to re-enter because he had an airplane right in his face. On reflection, I believe that the PA28 may have not heard my transmission or he chose to ignore it because he was annoyed that I was using the runway opposite to him. He does not realize that the downhill slope makes a significant difference to a heavily loaded aircraft on takeoff. Additionally, takeoff on runway 2 full length requires a back taxi on the active because the parallel does not continue all the way to the end. I had his aircraft in sight at all times and the nearest we approached was about 1 mi. He never did turn a base leg and I immediately turned crosswind off of runway 20 so our paths were always parallel or diverging. I have previously coordinated expedited departures for myself with aircraft that are in the pattern at dro. Often times it's other professionally operated aircraft. It was never a problem before. The more senior pilots perhaps are better judges when it comes to determining the risk of a midair when they see other aircraft in-flight. Another factor, I always received an acknowledgement before. This time I did not. Perhaps that was my error.

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Original NASA ASRS Text

Title: PLT OF A PART 135 CARGO C208 DEPARTED DRO OFF RWY 20 WITH DOWNHILL SLOPE MAY HAVE OFFENDED THE PLT OF A PA28 IN THE PATTERN FOR RWY 2.

Narrative: DRO RWY 20 AND RWY 2. RWY 20 HAS A DOWNHILL GRADE OF ABOUT 1%. WINDS CALM, WX CAVU. DEPARTING WITH NIGHTLY SCHEDULED C208 FREIGHT FLT AT MAX GROSS WT. PA24 HAD JUST DEPARTED RWY 2 AND WAS MAKING L XWIND. PA28 CALLING HIMSELF 'WARRIOR N (UNKNOWN)' RPTED L DOWNWIND FOR RWY 2. I CALLED THAT I WAS DEPARTING RWY 20 AND THAT I HAD THE 'CHEROKEE' IN SIGHT. I EXPEDITED THE L XWIND TURN AND WAS HDG PERPENDICULAR TO THE RWY CTRLINE PRIOR TO SEEING ANY TURN BY THE PA28. AT THAT TIME, I SAW HIM TURN R OUT OF THE DOWNWIND. ABOUT 15 SECONDS LATER I HEARD HIM XMIT SOMETHING LIKE HE WAS EXITING THE PATTERN AND WAS GOING TO RE-ENTER BECAUSE HE HAD AN AIRPLANE RIGHT IN HIS FACE. ON REFLECTION, I BELIEVE THAT THE PA28 MAY HAVE NOT HEARD MY XMISSION OR HE CHOSE TO IGNORE IT BECAUSE HE WAS ANNOYED THAT I WAS USING THE RWY OPPOSITE TO HIM. HE DOES NOT REALIZE THAT THE DOWNHILL SLOPE MAKES A SIGNIFICANT DIFFERENCE TO A HEAVILY LOADED ACFT ON TKOF. ADDITIONALLY, TKOF ON RWY 2 FULL LENGTH REQUIRES A BACK TAXI ON THE ACTIVE BECAUSE THE PARALLEL DOES NOT CONTINUE ALL THE WAY TO THE END. I HAD HIS ACFT IN SIGHT AT ALL TIMES AND THE NEAREST WE APCHED WAS ABOUT 1 MI. HE NEVER DID TURN A BASE LEG AND I IMMEDIATELY TURNED XWIND OFF OF RWY 20 SO OUR PATHS WERE ALWAYS PARALLEL OR DIVERGING. I HAVE PREVIOUSLY COORDINATED EXPEDITED DEPS FOR MYSELF WITH ACFT THAT ARE IN THE PATTERN AT DRO. OFTEN TIMES IT'S OTHER PROFESSIONALLY OPERATED ACFT. IT WAS NEVER A PROB BEFORE. THE MORE SENIOR PLTS PERHAPS ARE BETTER JUDGES WHEN IT COMES TO DETERMINING THE RISK OF A MIDAIR WHEN THEY SEE OTHER ACFT INFLT. ANOTHER FACTOR, I ALWAYS RECEIVED AN ACKNOWLEDGEMENT BEFORE. THIS TIME I DID NOT. PERHAPS THAT WAS MY ERROR.

Data retrieved from NASA's ASRS site as of July 2007 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.