I believe its an old Cessna 170, old enough to have a venturi tube on the side of the cowl to run the gyro instruments. It's a tail dragger, so it's not a 152. Also, it holds 4 SOBs, so it's not the Cub. The control yoke looks like what's in the Cessna.
This time I was able to see it. As a former private pilot with my instrument ticket, I see two main causes, both the responsibility of the pilot: weight and balance, and density altitude. The "downdraft" is just an excuse. The aircraft had an extremely long takeoff run and was unable to climb out. It was way behind the power curve as shown by its "mushing," especially towards the end. The aircraft was very possibly overloaded, as well. Give the pilot credit, tho, for not stalling the sucker and probably killing everyone.