by dirkverdonck » Wed Sep 19, 2018 8:45 am
Hi Wes,
I have just under 30 hrs now on the Onex and I use the trim as follows: neutral for T/O and climb until flaps are up and rpm reduced to 3000.
Then just a trickle nose up trim to maintain 90 kias in the climb and when arriving at cruise alt, just a trickle down to maintain 110 kias.
Arriving back into the pattern, I reduce to below 90 kias, select 1/3 flaps , they are electrically operated via a screwjack, and a trickle nose up trim to maintain 80 kias during the descent, base 2/3 flaps and some nose up trim and on short final, full flaps and trim all the way up.
The trim system is very sensitive, only 1 full turn of the wheel from full nose down to full nose up, so some fingerspitzengefuhl is required!
I flew the "dial a trim" on a Sonex a couple of times and it took me all downwind to go from cruise to all nose up trim! This took way too long for my liking and the search for a better solution could begin.
I took some inspiration from very old Sonex plans which show an external trim tab and combined it with a proper trim wheel and an idler and a spring to avoid two cables to the trim tab.
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Dirk Verdonck
Leffinge, Belgium
Onex #117
Taildragger, Aerovee 2.1, MGL iEFIS, TRIG radio and Transponder, electric flaps, external elevator trim, shortened wingtips, hydraulic brakes, hightened seat pan, extra inspection panels, etc