this is just to let people know if they by a micro hydro from mini cat racing to make sure u check were the flex shaft is solderd on to the shaft stub. mine broke of after about 6 runs. this is not minicat racings fault as they are just a importer.after mine broke we have taken the other 2 out of the other boats my friends have and 1 is good and the other needs to be re solderd.if this part comes of u loose the shaft, prop and drive dog.if anyone is going to buy one of these boats this is the only fault i have found and that can be fixed with a soldering iron in acouple of minutes.as for the rest of the boat it is first class.very fast and very well made.