here an AV for Heeleycopter's Sig Four Star for RF 7.5 and the CS shown here , i noticed a problem in the physics model on the original EA which transferred to the AV , the visual frame missing for the tail wheel , so if you go into the physics editor and go to tail wheel click on the visual frame "none" and change the visual frame from none to ~CS_SW that will fix the tail wheel so it does not sink into the ground