REFLECTOR: Pitch Trim Mystery

[Scott Derrick]

You might want to consider adding a dynamic brake. I found that at high 
speeds my elevator trim motor over ran my input, I think it coasts just 
a bit. This resulted in a jab fest of up and down trim inputs until I 
hit on the right amount.

adding the brake reduced this considerably.

I've attached a simple brake circuit.

YMMV

Scott

John Dibble wrote:
> OK, here's what I found.  I think the problem is in the relay.  It looks
> like the relay is home made (see pic).  Two pitch trim wires come from
> the stick.  When neither trim button is pressed, both wires are +12V.
> The two wires going to the motor are both 0V.  When one button is
> pressed, (and the trim is working properly) one of the wires from the
> stick goes to 0V and one of the wires to the motor goes to +12V.  When
> the up trim fails, the wires from the stick have the same voltage as
> when the trim is working, but the wires to the motor are both +12V.
> Whether working or not, the relay clicks when either trim button is
> pressed.
> So now I need to know what I can use to replace this relay.  I have a
> MAC-7 stick grip.
>
> Thanks,
> John
>
>   
>
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    Liberty means responsibility. That is why most men dread it.

    George Bernard Shaw, Liberty 

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