Narrative:

We (student pilot in training and myself) departed lvj on runway 14. We climbed to 700 ft and then turned to the southwest (210 heading). We made at least three radio calls (prior to departure; after departure reporting southwest direction and altitude twice). Prior to departure I noticed an experimental airplane taxiing to runway 14. The experimental made at least two calls; prior to departure and then on the turn to the southwest (altitude was not reported). When I realized the experimental was going in the same direction as we were; I reported our position again (it was a hunch; but I felt in my gut at this time that this was not good - a faster airplane climbing behind you in the same direction). I was preoccupied looking for the plane; the student was doing a good job flying the climb. I got a visual of the experimental about 300 ft from departure; but lost sight of it because of distance. As we climbed (in steps because of the class B shelves); I was swiveling my head to try to get a visual on the experimental. I asked my student as well (on his side). We both never saw the experimental plane until we noticed it straight above us through our windshield; 100-200 ft above us; appeared to be in level flight (we were climbing); going in the same direction; but much faster than us (approximately 40 knots faster). That was too close. I tried to make contact with the experimental on the lvj unicom; but no response was heard. I seriously doubt that he saw us since we would have been below the nose from his perspective and he snuck up behind us really quick. This was much too close and announced it on the radio my discontent hoping he could hear it.in hindsight; I wish I would have made contact with the experimental pilot much sooner (when my gut told me). This way I could have been more proactive in keeping separation rather than passively hoping that he was going to see and avoid us. An alternative would have been to go another direction (e.g.; south) and turn west once I felt enough time would have elapsed. This would have avoid the plane completely or at least a perspective to see the other plane off our right side rather than straight behind us. I am also going to be more aware of the planes expected to take off soon after me. I wish I would have gotten its tail number ahead of time because I really want to talk to the pilot; not so much to complain; but to ask him if he ever had sight of us and if he didn't - there is something he could learn from this too. In many years of flying; I've only been surprised by another plane two other times; but never this close. What bugs me about today's incident is that this incident today was easily avoidable. I am concerned that if we hadn't take those steps in the climb; its possible that a collision would have happened - not good at all. I hope others can learn from this; I certainly did - be proactive in collision avoidance; don't trust other to do the same.

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Original NASA ASRS Text

Title: C172 Instructor experiences a NMAC with an overtaking aircraft that had departed the same airport just after he had.

Narrative: We (student pilot in training and myself) departed LVJ on runway 14. We climbed to 700 ft and then turned to the southwest (210 heading). We made at least three radio calls (prior to departure; after departure reporting southwest direction and altitude twice). Prior to departure I noticed an experimental airplane taxiing to runway 14. The experimental made at least two calls; prior to departure and then on the turn to the southwest (altitude was not reported). When I realized the experimental was going in the same direction as we were; I reported our position again (it was a hunch; but I felt in my gut at this time that this was not good - a faster airplane climbing behind you in the same direction). I was preoccupied looking for the plane; the student was doing a good job flying the climb. I got a visual of the experimental about 300 ft from departure; but lost sight of it because of distance. As we climbed (in steps because of the Class B shelves); I was swiveling my head to try to get a visual on the experimental. I asked my student as well (on his side). We both never saw the experimental plane until we noticed it straight above us through our windshield; 100-200 ft above us; appeared to be in level flight (we were climbing); going in the same direction; but much faster than us (approximately 40 knots faster). That was too close. I tried to make contact with the experimental on the LVJ unicom; but no response was heard. I seriously doubt that he saw us since we would have been below the nose from his perspective and he snuck up behind us really quick. This was much too close and announced it on the radio my discontent hoping he could hear it.In hindsight; I wish I would have made contact with the experimental pilot much sooner (when my gut told me). This way I could have been more proactive in keeping separation rather than passively hoping that he was going to see and avoid us. An alternative would have been to go another direction (e.g.; south) and turn west once I felt enough time would have elapsed. This would have avoid the plane completely or at least a perspective to see the other plane off our right side rather than straight behind us. I am also going to be more aware of the planes expected to take off soon after me. I wish I would have gotten its tail number ahead of time because I really want to talk to the pilot; not so much to complain; but to ask him if he ever had sight of us and if he didn't - there is something he could learn from this too. In many years of flying; I've only been surprised by another plane two other times; but never this close. What bugs me about today's incident is that this incident today was easily avoidable. I am concerned that if we hadn't take those steps in the climb; its possible that a collision would have happened - not good at all. I hope others can learn from this; I certainly did - be proactive in collision avoidance; don't trust other to do the same.

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.