Tailplane incidence change improves control.
Compared with the early brackets, newer Rans part KPHS0026 has two new positions for the ‘hinge bracket’ bolt. You need a pair, one each side. See current build diagram item 25. I bought them ($20).
The top hole already reduces tail upforce & the second lowers it still more. It’s a factory originated mod to mitigate that heavy nose down when the elastic trim is off.
The old removed lugs are shown, with the later type Rans S4 ones already installed using the top of two available holes for the tailplane 'hinge' bolt, which is ~1/4" lower than the original.
They fitted straight onto the original through fuselage bolt on my 1990 S4.
Compared with the early brackets, newer Rans part KPHS0026 has two new positions for the ‘hinge bracket’ bolt. You need a pair, one each side. See current build diagram item 25. I bought them ($20).
The top hole already reduces tail upforce & the second lowers it still more. It’s a factory originated mod to mitigate that heavy nose down when the elastic trim is off.
The old removed lugs are shown, with the later type Rans S4 ones already installed using the top of two available holes for the tailplane 'hinge' bolt, which is ~1/4" lower than the original.
They fitted straight onto the original through fuselage bolt on my 1990 S4.
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