I apologize if this has been brought up in another post, but how cold is too cold for the water to run your boat? I've heard of the metal components becoming very brittle and having a better chance of breaking if hitting an obsticle. I think I've heard no less than around 50*F.

For metal to become 'brittle' from the cold I think it's going to have to be quite a bit cooler than 50* ('C', 'F', or absolute)! I can honestly say that you are not going to be out in that kinda tempurature - LOL.
- 'Doc

Yea I know it sounds ridiculous, I was just lookin for some input...

If you got open water and you can stand to be out there then go for it . The airplane guys fly in below freezing tempertures . The only thing is the batteries don't last as long and they have to keep warming them up .

indebound,
Having gotten past my first thoughts about temperature (sorry 'bout that), here's one or two more. Besides ~my~ comfort, you might consider what the cold might do to any fluids in your boat, like grease or oil used for lubrication. Cold temps will make them thicken to some extent. Probably not for long since friction from running will warm things up, but it might shave the maximum speed a bit, or make directional control a tiny bit slower. (I honestly don't think it will make a huge difference at any temp that my delicate body gets exposed to, but it could make some.)
Other materials are usually affected before metal is, sort of. Plastics seem to be a bit more brittle, and so is some fibreglass, paints, and who knows what else. Knowing what I will put up with, none of my models need to worry too much about shattering themselves to pieces because of the cold. Getting dropped maybe, but not the cold...
- 'Doc

I figure if the water is not frozen go for it. Of course I don't because if its under 55*, Its just to cold for me. And like the others say keep the packs warm or you will lose a bit of run time on them