It is just like many of the warbirds on wheels and the fellows must learn to always keep full up elevator on the start of a takeoff roll and on rollout after landing or you get a prop strike. Also as already mentioned a little parafin wax on the ski's would be a wonderful idea.

Now having mentioned the piloting part of the equation a very simple rerig as Proptop described that will simply disallow over rotation to the point of a prop strike is the obvious next step and that is what the point of the ski rigging is in the first place i.e. not allowing over rotation either way. Actually a full over rotation of a ski to ninety degrees down is a horrfic thought full scale or model.

John