Rv-9 pilot reported the student pilot lost control during takeoff roll that resulted in a runway exc...

Attributes
ACN	1447430
Time
Date	201705
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	RV-9
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	Direct
Flight Plan	None
Person 1
Function	Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 12 Flight Crew Total 4279 Flight Crew Type 29
Events
Anomaly	Ground Event / Encounter Loss Of Aircraft Control Ground Event / Encounter Object Ground Excursion Runway

Narrative:

I was in the passenger seat with a student pilot. I had flown with the owner of this plane for some 20+ hours. He had asked me to accompany him to [another airport] for a phase check toward his pilot license. On takeoff he applied power too fast and forces pulled the aircraft violently off to the left. I wasn't expecting this as I had my legs and feet crossed keeping them out of the way of the rudder pedals. I called for more right rudder while trying to retard the throttle. We over corrected and ran off the runway to the right hitting a taxi sign doing substantial damage to the aircraft. The right elevator hinge pin; which hangs down; hit the top of the sign flipping it up and off its post making contact with the right horizontal stabilizer. Lucky no one got hurt or damage to other aircraft.

Original NASA ASRS Text

Title: RV-9 pilot reported the student pilot lost control during takeoff roll that resulted in a runway excursion and contact with a taxiway sign.

Narrative: I was in the passenger seat with a student pilot. I had flown with the owner of this plane for some 20+ hours. He had asked me to accompany him to [another airport] for a phase check toward his pilot license. On takeoff he applied power too fast and forces pulled the aircraft violently off to the left. I wasn't expecting this as I had my legs and feet crossed keeping them out of the way of the rudder pedals. I called for more right rudder while trying to retard the throttle. We over corrected and ran off the runway to the right hitting a taxi sign doing substantial damage to the aircraft. The right elevator hinge pin; which hangs down; hit the top of the sign flipping it up and off its post making contact with the right horizontal stabilizer. Lucky no one got hurt or damage to other aircraft.

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.

Rv-9 pilot reported the student pilot lost control during takeoff roll that resulted in a runway excursion and contact with a taxiway sign.