And here is the Jetco Navigator I mentioned above. This model was originally designed and kitted as a single channel (rudder only or rudder with "kick-up" elevator). No provision was made for a throttle and the recommended engine was .074 to .10.

My modifications included:

* Using spruce for wing spars instead of balsa (spruce is 10 times the strength but only 4 times the weight of balsa). I felt it was needed to handle the extra weight and power load.
* Redesigning the wing for ailerons (including differential due to the flat bottom airfoil).
* Completely redesigning the power pod and it's pylon to include a built-in fuel tank with clunk (had to custom make out of tin stock to fit the profile of the power pod). Designed for a Fox .25 R/C engine. This meant the throttle linkage had to be routed through the pylon. The throttle servo, along with the aileron servo, was located in the wing center section.
* Redesigning the stabilizer for a full elevator (rather than the small "kick up" type).
* Designing a tail dragger type landing gear (rather than the tricycle arrangement shown on the plans) to take advantage of a combination tail-wheel/water rudder of my design for steering.
* And of course the addition of the chine rails that made for really easy water handling.