Dear subscribers,

 

During my rebuild process of my 4 P I reached the electrical system now. Since most of it looks like a complete mess I decided to take most of it out and redo it. I came across my trim system and decided to redo it.

 

I have a trim system for rudder, aileron and elevator from the Ray Allen Company. I checked their web site and the components that I have in my plane matches their recommendation for the 4P.

 

I sketched the wiring of what I found in my attachment.

 

What I know so far:

Reg-1 component: turns my 24V down to 12V

SPD-1 + MAC component: lets you adjust the voltage to change the speed of the servo motors

Rel-1 component: is used when you use a 4 position switch instead of a 2 position switch

 

I try to find a complete wiring diagram for the 4P. But I only found wiring instructions for the single components. I sent my self made diagram to the manufacturer of the components (just to confirm that what I have is ok) but it seems they don’t have the time to look at it closer because I get different answers. May be someone on the list has the time and knowledge to evaluate what I have.

 

What I think it does is: I can adjust the travel speed of my elevator and aileron with the two SPD-1 components

My rudder trim (including indicator) can not be adjusted because it gets driven by the 12V coming out of the Reg-1 component

What I don’t get is: Why is there a speed control (MAC component) in front of my needle elevator indicator (needle style)?

I understand the wiring of the Rel-1 components and it matches the manufacturer recommendation.

 

The manufacturer also recommends that I replace the Rel-1 against a Rel-2 which does the same but lasts longer.

 

Any help is appreciated but please keep in mind that you are talking to an electrical cave man.

 

Thanks for your help

 

Ralf