Been flying the qx again today and as I get more confident I push what I can do a little more, to the point where I have had several crashes. After a hard knock into the side of my van I noticed that it was a little louder than it was and after inspection saw a little nic in 1 of the props. I was under the impression that the coloured blades were 1 rotation and the black another. This however was not the case. The 2 extra coloured props included in the box have opposite rotation, same with the black. I put the wrong green blade on and it wouldn't fly. Took the other one out and fitted it and all was fine. Anyway I looked on ebay at extra props and they come in pairs with the same rotation which just seems daft. I would have thought they would be sold as front or back pairs not left or right. Anyway I've said my piece and now I'm just wondering if anyone has found a cheaper prop alternative. It looks like I need to spend £12 if I need to replace the front or back props which seems rather steep for some moulded plastic. Cheers Graham