Ok. I finally got around to replacing my 2nd Helimax 1si. Now belongs to my oldest grandson. I jumped on the x5 bandwagon after reading all the posts about all the cool things you can do with it. I won't get it until next week so I have some time to plan before tearing into it. This is also my 1st gear drive. I think that might be a fun part to modify. Change some ratios and maybe prop size....... Anyway. I was hoping some of you Syma "gear heads" could offer some advice. I like to tinker so don't be shy! Thanks guys!!