I just wanted to let yall know i am now a true believer in an aluminum spinner!! i crashed my extra going 100 MPH+ spinner first into the ground and not only did it keep my motor safe it didnt even leave a scratch on the spinner BUT it did leave a nice 4 inch dent into the ground..So im wondering how many of you guys out there use aluminum spinners???? i know im gonna put them on all my planes now.