posted 11-10-2013 02:32 PM ET (US)
Fly-by-wireWhen modern outboard engines began to use electronic controls to actuate their throttle and shift mechanisms, various writers called these systems "fly-by-wire" systems. The first outboard to have electronic controls was probably the VERADO, and I believe that is where the term was first used. It seems to have become ingrained with many boaters, who continue to use "fly-by-wire" to describe these systems. I have never liked the use of "fly-by-wire" when applied to controls for outboard engines for boats.
The first problem with calling a boat's electronic throttle and shift a fly-by-wire system is that boats do not fly. It made no sense at all to me to talk about their control systems in terms of flight. Second, in the term "fly-by-wire" there is a sense that something more is going on in the controls than just transmission of the operator's input to the actual control function. This is true in the case of some aircraft designs that were used in early stealth war planes. The electronic control system needed to assist the pilot because the aerodynamic qualities of the aircraft were not very good, as they were sacrificed in favor of stealthy RADAR cross section or low heat emission. In an outboard engine, the use of electronic throttle and shift controls is quite a bit less complicated than in a fly-by-wire stealth war plane. That is why I got a laugh when watching a film documentary on the design and building of the Boeing 777 jetliner. In an early segment the chief engineer of the flight control system appears on camera and says:
"Fly-by-wire" is an unfortunate term. Probably "electronic flight control system" is as close as you can come to the real definition. It is simply the idea that we use electrical wires rather than mechanical cables to transfer signals from the front end to the back end of the airplane.
"There's an apprehension anytime you change technology, and particularly when you switch from mechanical, which is visible, to electrical, which is not."
--Jim McWha
777 Chief Engineer, Flight Control
appearing in 21st Century Jet--Making the Boeing 777
Describing why the 777 did not go to the extreme of letting a computer fly the plane, but lets the pilot be in control, he goes on to say, "The biggest disadvantage from a safety point of view is the potential that you haven't thought clearly thought through all the events that may occur and taken enough precaution."
I found this to be quite interesting. Here's an airplane that is generally thought to be a fly-by-wire controlled airplane, and the top engineer of the flight control system says that "fly-by-wire" is an unfortunate term. I have to observe that if "fly-by-wire" is an unfortunate term for a 777's flight control, then it seems rather silly to use that term on an outboard engine control system.
At the present, I believe that modern outboard engines are available from several manufacturers with electronic shift and throttle controls. There stills seems to be apprehension about their use, perhaps a result of the overuse of an "unfortunate" term.