A couple of other possible contributing factors:

It appears that just prior to nosing over there was right rudder deflection. The gyroscopic reaction to a right turn is a raising of the tail. The engine and prop act as a large gyroscope and deflecting the axis of a gyro produces movement 90 degrees to the applied force. That is easily experience in a 180 during the takeoff roll; lifting the tail while in the takeoff roll produces a strong left turning force that has to be counteracted with increased right rudder.

Also; the pilot appeared to be breaking severely. That could easily slosh all the fuel forward against the front of the tanks. Say with 2/3 fuel in standard 60 gallon tanks, that would translate into a weight shift of almost 240 pounds. This weight shift would rapidly move the center of gravity forward. A 180 without any baggage and front seats filled is on or out of the front edge of the CG envelope anyway.

These two factors added to the heavy braking may have been enough to lighten the tail; overcoming the down elevator being applied.

Tom

GumpAir wrote:...
You'd have to work real hard to do that in a Cessna 180. ......

"There's no such thing as fool-proof to a sufficiently determined fool".

z3skybolt wrote:

It appears to me that he was applying brakes during a wheel landing and trying to keep the tail up. Braking with the tail up is O.K. if you are skilled. It is a quick way to slow and get the tail down at the same time. But be darned sure that the stick is coming back in your stomach as you brake and moderate the brakes accordingly.

I totally agree Bob.

If you notice, he lost control when he let the tail come down. very common place to start a ground loop, either caused by gyrocsopic veer to the left and or inattention or both.