In a series control system, the cables run from controls at the upper station to the lower station controls. Then a second set of controls runs from the lower station to the engine. This method is generally used for longer, more difficult cable runs.
When to utilize a parallel system or a series system is dictated by the total degrees of bend in the cables as measured by the sum of the degrees of all bend radii This directly affects the efficiency of cable action The configuration that gives the control system the fewest degrees of bend is the one that should be employed
Control head mountings
A final choice in engine control styles is the type of mounting. Morse Controls makes a wide variety of controls so that the boat owner can tailor the control to the boat's exact needs and their own preferences
Understanding mechanical advantage
By design; every control has a specific mechanical advantage factor Simply stated, Mechanical advantage means, that because you are using a lever to create motion at the other end of a control system (move the throttle or shift mechanism on the engine itself) it requires less effort at the control handle than it would if you were pushing directly on the engine's throttle or shift mechanism.
As an example, if an engine required 15 lbs. of force to move its shift lever and you were using a control with a mechanical advantage of 2.77, you would divide the force by the mechanical advantage to determine how much effort must be exerted at the control lever handle to create the needed 15 lbs. of force.
force ÷ mechanical advantage = force required at the control lever
15 lbs. ÷ 2.77 = 5.42 pounds of force required at the control lever
Understanding a control's mechanical advantage and the amount of force to be overcome at the engine is very important when specifying the appropriate control.
How to measure for control cable installation:
For initial installations, measure the distances A and B along an unobstructed path to the throttle and/or clutch connection. Add A and B together then round up to the nearest whole foot and that is the recommended length Cable bends for most cables should not have less than an 8" radius Cable bends using Supreme Cables can be as low as 4'. Care should be taken to avoid unnecessary cable bends because each one adds to a cable's inefficiency.
For outboard applications it is necessary to add an additional four feet for the loop that allows unrestricted engine movement
For replacement cable installations simply remove the cable from the boat and measure the cable as indicated below.
That length will be the proper replacement length.
To order specify the length in inches and round up to the nearest whole foot Other connection kits or hardware may be necessary.