[borealnw]

I am going to decribe the situation as clear as possible. For months I have been fighting an elevator dual servo mis-match.

Plane TOC 30% Yak
TX DX7
RX Spectrum 9000
Servo's 7985 X2 coreless Digitals
Controle horns Dubro large scale.
Arms Airwild 1.5 inboard
Linkage Carbon fiber with Desert Aircraft Titanium rods.


Here is what I have done.

Drilled controle surfaces on a jig and drill press with elev level both ways.
Set up the horns at same angle and same distance from leading edge.
Distance from elev to horns end is the same. 1 1/8" making the arm on controle horn 1 3/8"
I've used a Hitech Digital programmer to center and set ends points of servo's.
I have the servo's plugged into the RX Elev and Aux 2.
I have mixed the TX using mix number 5 elev to Flaps (Aux 2)
Mix is set to 100% up and 100% down. NO offset.

In the TX.

I have 0 subtrim in both elevators surfaces. Set that up mechanically in linkage distance.
End points Elev set at 110 or 45% full up and down. Hi rates.
I have the Flaps end points set to match the 45% but the numbers are different (why I do not know)

All that done I have both half's set equal for center. Full up they are equal. Full down they are equal.

Problem #1 Low rates or IMAC they are not centered and way off both ways.
Problem #2 Moving the stick the Aux 2 side moves Faster then the elveator side both up and down.

Some at the airfield thinks it is the RX. Being a DX7. They say I am limited in adjustments and the DX7 does not allow me to seperate the trim from the endpoints. The signal from Aux2 is faster then elev therefor is throwing off the speed and Low rate endpoints.

today I talked with another fellow IMAC pilot and he says it is not the RX because his 12X and one of his planes has the smae problem.

Anyway I am wondering if some in FG have run into this porblem and possible fixes to try.

At the moment I am going to run the endpoints equal for IMAC rates and let the high rates fall where the may. But is this porper thinking is it that crucial to have the elev equal for 3D.

Would spending money on a 10X or a 9303 remedy the problem.

Would a Smart fly power expander fix the problem.

I have tried a Smart Fly EQ3D and compounded the problem in that the equalizer would cause the DX7 to loose its "bind" on the plane. Something to do with the self check in the Smart Fly when the TX is linking up with the Spectrum RX. Causing the code to not be seen loosing the bind???????