I have the ISC Staudacher (see pic to left) very good arc, been flying for about a year, 50 + flights with G45 up front. Yes this bird tip stalls too! Just read in Model Airplane News??? about someone experimenting with putting on straight pieces of wood at the tips or the wing about 3/4" bigger then the tip size. They said it improved the tip stalls and allowed them to land slower. They said it pushed more air over the ailerons by forcing it back on the control surface, I might even try this too??