This is what I'd said on the vegas thread.I was just at my favorite hobby shop and found out the owner races 1/8 tunnel hulls.He's showed me his prop colections about 20 props!!! So I'd asked him about round and pointed ones. He'd told me the the round and scoop props are for power and speed.The pointed ones are for lift and some what speed.I wished I had his colections of props! But I like the web about props you'd put up jetpack!!