Chuck, thinking back to when I tried the APC 10x5, the dry lake (smooth) was flooded, so I went up to the old abandoned military airstrip at Manzanar. This is cracked asphalt with chuckholes. I think the little wheels probably dropped down in a crack or hole and chewed my props down. I went through two before giving it up. Plus my landing gear might be splayed out a bit from some not so perfect landings (belly flops).