Skyhawk 172/Cutlass 172
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 85; Flight Crew Total 750; Flight Crew Type 250
Communication Breakdown; Situational Awareness; Time Pressure
Conflict NMAC
Flight Crew Took Evasive Action
Airport; Human Factors
A Cessna 172 was on final and the banner tow was on a high slow left base for runway 25. We were holding short of runway 25. The Cessna 172 landed and taxied clear of runway 25. The banner tower aircraft was on final and I thought there was enough room to depart. I told my student to immediately takeoff. The banner tow aircraft was dropping the banner towards the departure end of the runway between the taxiway and the grass. As we were taking off; I had misjudged the speed of the banner tow aircraft dropping the banner. As we rotated; the banner tow aircraft was 200 ft. above us and descending. The banner tow aircraft then said on the CTAF 'do you have me in sight? I'm right above you'. I repeated by saying 'yes we have you in sight'. The contributing factors were the banner tow aircraft entering the pattern on a left base to runway 25 as opposed to a 45 degree entry for 25; poor judgement on my part; and an invulnerability attitude towards the banner tow aircraft. Now; I don't know if I had broken a regulation but there was a loss of separation between us and the banner tow aircraft. In addition; the incident took place at an uncontrolled Class G airport.
When the instructor pilot aboard a C172 misjudged the spacing between a landing Cessna and a following banner tow plane entering the pattern on a left base to drop the banner he told his student to takeoff immediately. During their initial climbout from the non-towered airport the pilot of the banner two advised on CTAF that they were climbing immediately below him.