Well I made (and will be making) some above water photos. I got near my countryside house a river with quite a strong stream, and so taking water shots is difficult, but not impossible. I'm making them mostly on my own, without any help (but sometimes it's necessary). My hints? Well - first of all, it all depends on the bottom kind. If the bottom of the river (or whatever water you're working on with Your Joes) is rocky and has plenty of stones - the task is easier. Simply you just have to get some rocks together to make a platform for the vechicle you want to stand still. Of course I do not advise to take photos on 2 meter deep water. Shallow are better - you don't need to have that much rocks...
BUT if you don't have any rocks... hen making an anchor is the best idea, but you can also use some building foam or styrofoam and attach it using e. g. double sided adhesive tape. This works especially with hovercrafts like Cobra Rat (I'll try to post some pics today).
Well every idea is good - attaching boats to heavy objects on the banks using (clear or green - depends on the foliage around) fishing string could also work if you take good shooting angle (eliminates 90% of computer editing).
The idea with those engines is great - I'll have to try it, but for me they seem better in taking in-movement pictures.

If anybody have any questions - feel free to ask, I'm maybe not a master or even a very good photo shooter, but I may know other tips than you.

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