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[thebackways]

this might be a silly thing
i have a 40mhz setup for my boats but when i  turn the rudder to the right the throttle slows down and if i turn enough the prop starts to turn backwards
this is only during left hand turns. if i turn the rudder all the way to the right ( to turn the boat left ) the rudder completly reverses and the prop spins backwards and the boat becomes uncontrollable
this effect remains till i drop the throttle and the rudder to neutral. i havent had her out on the open water yet as im worried about the control ( and the lack of superstructure )
any ideas ?

[john s 2]

Can you let the lads know the make and model of your trans and rec? this can help their answers.John.

[thebackways]

its an acoms techniplus AP-202/40 transmitter with an acoms ar2 / 40 receiver

[malcolmfrary]

Assuming that this is a basic two channel set, with no fancy mixing, it sounds like either the TX or RX is broken,  Operating the rudder should have no effect on the throttle, and vice-versa.
My best guess is a fault in the transmitter, probably in the wiring to the sticks potentiometers, since that is where the encoding is derived.
For the rudder turning too far, this should never happen unless the mechanical linkage is badly set up.  The effective lengths of the servo arm and the rudder arm should be equal to prevent the rudder going over center and latching.  On the other hand, if there is mutual interference between the two channels, the throttle channel might be upsetting the rudder channel.
It sounds like you set it up to act like a tiller - I think most of us prefer to use the "left for left, right for right" convention as it saves a lot of thinking.