I love this thread! Close to my heart.
My Donzi, I see, has already been discussed in some detail. Trial and error - I think I have found a good solution to the many imperfections I first encountered. I ditched my AM radio and heavy gel cell batteries. I have since added an FM radio and light stick batteries (pushed all the way back by the transom for better balance). The boat has been clocked at 12.5mph - and I think it is capable of even faster speed. It is more speed than necessary and certainly much more speed than scale. But having that boat quickly accelerate and go fast is a blast.
I bought the boat already assembled - - all I needed to do was install the running gear (which was enough of a challenge for me). My next project is to build the twin fishing poles for the port and starboard (forgive me if the poles are called another term - I just don't know it).
Any advice or instruction on how to build decent looking poles will be greatly appreciated.
Attached are a couple of recent videos (already posted on RC Groups - - Hansen Dam thread)
http://media.putfile.com/Donzi-at-Hansen
http://media.putfile.com/100-3035