I've got a MHZ Gecko that I need a controller for. The motor that is in it is a 3200Kv walkera from ebay that will drive a 28mm carbon prop. What size brushless controller do I need?

I was looking at a 40A Jeti controller. Is that enough? Too much? Are there specific controllers for boats and cars versus airplanes, or can the controller I pictured below run my boat?

Not enough info out there for brushless beginners.

Jdoug, I just ordered the Gecko also. And I have been doing some reading on it and I am pretty sure the 40 amp will be just fine, especially with the 3200kv set up and the 28 mm prop. I ordered mine with the Race 440 and a 31mm prop. They said it will pull 25 to 30 amps with that set up. But I know that brushless pulls less amps.
I can't wait to get it. My first challenge will be to mount the servo. Not sure how yet, but once I get to look inside the boat it shouldn't be too hard.

Yes there are different esc's for airplanes vs boats. An airplane esc does not have reverse. If there is no problem having no reverse you should be fine. (if that picture is a plane esc)

Ryan

I have the Jeti 600 in my Aqua Jet Extreme, it doesn't have reverse and you really don't need it unless you are running a scale boat. Actually, reverse can sink a boat quickly if you are not careful. My Aquacraft Profisherman has reverse, but I never use it.

I also never use reverse. It is much different from a car enviroment, where space may be limited.

Ryan