Never had any concern about "tipping over" on grass nor felt it likely to happen, largely because it isn't, as millions of European training hours have proved.
Ignoring of course the times when it has happened
(and the many others outside Europe!)
https://assets.digital.cabinet-offic...CCJE_07-06.pdf
Following an uneventful flight, the commander was demonstrating an autorotation to a student PPL who had recently purchased a similar type of helicopter.
He entered the flare with a relatively high rate of descent, which he was unable to arrest by raising the collective lever.
As the helicopter landed, the skids dug in to the relatively soft ground, causing it to roll on to its right side.
… on the other hand;
On May 24, 2011, at 1503 eastern daylight time, a Schweizer 269C, N7505Y, sustained substantial damage during a practice run-on landing at Asheville Regional Airport (AVL), Asheville, North Carolina. The certificated flight instructor (CFI) and private pilot receiving instruction were not injured.
According to the pilot receiving instruction, who was also the owner of the helicopter, the purpose of the flight was to conduct a flight review. Approximately 50 minutes into the flight, the CFI asked the pilot to demonstrate a run-on landing to runway 16. The pilot conducted the approach for landing at about 40 knots and touched down left of the runway centerline on both skids. As he lowered the collective, the helicopter’s right skid contacted a runway centerline light, shearing off the right skid and its support arms.
The pilot raised the collective, picked the helicopter up to a hover and turned towards the taxiway. Shortly after, the engine and rotor RPM began to drop, the pilot opened the throttle and lowered the collective, setting the helicopter on the left skid. The helicopter rolled over and came to rest on its right side, resulting in substantial damage to the main rotor blades.
AOPA Hover Power » Blog Archive » Running landings
Of course grass can always catch you on take off
