ORIGINAL: dadkins
I was wondering about the rudder cable buckling too - looks like you have a good straight throw and if you didn't have problems before - why would you now.
Looking good...and light... maybe too light : ) you could always throw a handfull of D batteries in there to keep it from power looping, but its hard to take weight off.
When we tried running my hydro that day, the problem that ended the day was the rudder cable buckled. On that boat, I used Dubro control cables which aren't brass plated and are more flexible than the Sullivan cables I usually use. The sullivan ones are stiffer cable, and are brass plated which makes them less prone to buckling. The hydro is the only boat that has had issues with cable buckling, that that is set up as a pull-pull setup. I set the radio box and cable arrangement up in such a way that the throws are as straight and level as possible.
On the weight issue; I am doing the hull as light as I possibly can so in the event of being "too light", I can add ballast.
I'll upload pics later tonight or tomorrow of the big Kami's servo/cable arrangement to give an idea how I set it up. My original rudder was junk so I re-did the rudder on it and had to lengthen the cable by a few inches. This kept the cable pretty rigid, and gave me the throw I needed to have a good turning radius.