Date: 201707
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: Small Aircraft; High Wing; 1 Eng; Fixed Gear
Operator: Personal
Operating under: Part 91
Flight plan: None
Mission: Training
Flight phase: Landing
ATC / advisory: Tower ZZZ
Aircraft component: Tail Wheel
Component problem: Design
Reporter organization: Personal
Reporter function: Pilot Flying; Single Pilot
Reporter qualification: Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Human factors: Confusion; Troubleshooting
Anomaly: Aircraft Equipment Problem Less Severe; Ground Event / Encounter Loss Of Aircraft Control
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Aircraft Aircraft Damaged; Flight Crew Became Reoriented
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: The 3.0 hour VFR Part 91 flight arrived at ZZZ around XA:30. Visual approaches to Runway XX were in use. Upon contacting tower; we requested a visual approach to Runway YY. Tower was unable and cleared us for the visual approach to Runway XX report midfield left downwind. Pattern; approach; descent and glidepath were normal. Given we have had previous issues with this aircraft; I talked out loud with my instructor all the way from our 5 mile final to touchdown. Flaps 2 was selected and a Ref speed of 60 mph was established on final. Upon touchdown in a full stall (stall warning indicator horn active) on the center line with no crab; aircraft tracked straight without rudder input until the tail wheel let down at which time the aircraft took a hard left skidding turn; exiting the runway about two thousand feet down. The aircraft did a 270 degree turn; ending facing perpendicular to the runway. Control inputs of full right rudder by me and my instructor had no effect on the ground track of this aircraft; even some right brake had no effect. The tower asked if they should dispatch the emergency equipment; I replied negative as there was no visual damage; nothing was hit; the aircraft remained upright; no personal injury; no prop strike. We had shut down once the aircraft came to a stop and then restarted and asked the tower for taxi to the FBO. The aircraft taxied normally and was shut down and chocked. Airport security arrived to check our personal condition. We reported all was good.Upon inspecting the aircraft; damage was noticed on the right aileron and wing tip. Based on my instructors and my experience; 20;000 plus hours; we are convinced that this incident and the identical incident at a different airfield; was a mechanical failure or design deficiency landing at or near the aft CG limit with gross landing weights of 1900 lbs (Max 2300 lbs). The tail wheel breaks and goes to caster resulting in an immediate hard left turn that cannot be controlled by right rudder or right brake. No amount of correct control inputs could keep the aircraft on the runway. Weather and wind were not factors.




Synopsis: CubCrafter CC-19 pilot reported a ground loop upon landing resulting in a runway excursion. The reporter believes this problem to be a mechanical design deficiency.