Sorry about your loss. Terrible. I'm familiar with this accident.

The NTSB preliminary report is more of a factual telling of the circumstances surrounding the accident. It goes over the information from the flight from all available sources, as well as an examination of the wreckage and condition afterwards. It does not go into the human factors.

I'm not going to go into your fathers issues, we both know them. The report did not include them because it was not factual evidence from the scene. The NTSB should issue a final report in the next few months that will take into account the circumstances the pilot was facing.

The report basically says that everything was normal prior to him taking off, and he failed to acknowledge communication from the tower when cleared for take-off and just departed. He never established radio contact with the tower or approach controller after departing. Shortly after departure, the plane nosed over and impacted the ground at high speed.

The information about the wreckage states that they were able to find all of the pieces and parts of the airplane in the same general area, and no parts came off on the runway or in the flight path before the impact with the ground. The plane was fueled and fuel discoloration was found in the crash area. Damage to the propeller shows it was turning at the time of impact, ruling out loss of power as a cause.

The weather was cloudy that morning but certainly within the capabilities of both the plane and your fathers ratings. The plane had a current annual inspection done in March, and all required updates would have been checked at that time.

Bottom line, probably not what you want to read, is that in all likelihood, a perfectly good airplane nosed over shortly after takeoff and collided with the ground seconds later with no obvious mechanical malfunction. The plane was not required to have any recording devices in the cockpit. In accidents like this, many times all the investigators can do is rule things out as a cause, and then the circumstantial evince can lead them to a conclusion. In your fathers accident, the NTSB is telling you that they can't find anything wrong with the plane.