On Sep 13, 5:11*am, wrote:
On Sep 13, 7:02*am, Robert Fidler wrote:

My glider requires a small amount of top rudder to keep coordinated in
a left turn. A right turn seems to require the appropriate amount of
right rudder. The glider flies straight and level ok with maybe a
minor amount of right aileron and left rudder. Wing incidence is close
(.1 of a degree) between the right and left with the method I used to
check.

Any wisdom out there which may heve suggestions about what to do next.
18M glider with half span flaps and full ailerons to 6 inchs from tip.

Sounds like it is out of rig- duh.
First check would be that all control surfaces on the wing are in
correct position- that is even with each other, in the static
condition with the wings loaded to deflection that occurs when in 1 G
flight. Sitck should end up centered also. Check in "0" or wherever
max L/d is and do the same at other commonly used positions. It is
likely something will show up as out of line. If wing incidence is
off, control movements to get straight flight can be expected to be
coordinated.
FWIW- Good luck
UH

Yep, what Hank said. Set flaps to zero and pull up on flaps and
ailerons (2 people) to remove any slop simulating flying condition
(about 5 # force) All should be even and flap should match fuselage
fairing and aileron should match trailing edge at tip. Next 'tram'
the bird using a steel tape, measure the distance from fin probe to
each wing tip (aileron cut out), measurments should be within a half
inch. If not, add shim to indicated lift fitting. Next make cardboard
template of root rib (wing off ship) then assemble bird and fit
template under left wing and draw a level line, move it to right wing
and check for same level line. If all the above checks out OK, change
pilot!
:) JJ