In completing my MOD70 (Mass Balance arm replacement) I ran the checks that were
called for in the MOD instructions. It calls for about 12 - 13 deg UP as
measured
---From the tailplane trailing edge and 4 deg DOWN.
The build manual is more specific when it comes to this part of the
construction.
It partly says...
The tailplane trailing edge needs to rotate upwards 12 deg and downwards 4 deg
to cover the full range.
You will notice (I hope) that as the trailing edge of the tailplane is raised
the
trailing edge of the tab
raises even further, the ratio being approximately 1.3 to 1. Therefore, when you
have raised the
trailing edge of the tailplane by 12, the tab should have raised 15.6 relative
to the tailplane or 27.6
---From the zero start position.
A maximum total movement of 18 and a minimum of 14.4 relative to the tailplane
is acceptable.
Similarly, moving the tailplane trailing edge down 4 deg from the zero reference
point the tab should
move down 5.2 relative to the tailplane, or 9.2 relative to the zero reference
position.
Well my aircraft behaves NOTHING like this. The previous owner (God bless him)
decided to build the Trim Tabs inverted. That is to say that the hinges for the
trim tabs are located at the BOTTOM of the tailplane, the actuator pins for
the trim tabs are located ON TOP of the tailplane, and the pip-pin access recess
is located at the BOTTOM of the tailplane.
.
The result of all this is that I only get about 5 deg up and 3 deg down but you
have not heard the worst.....in this configuration when the stabiliser trailing
edge is moved UP the trim tab goes DOWN and vice versa.
Can you now see why Im at my wits end? This what I inherited from a partially
built
project.... :-(
Besides running a bulldozer through the Europa, any ideas on what I should do?
Regards,
Tony
--------
Tony Vaccarella
Mascot NSW 2020
Sydney Australia
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