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1. 03:44 PM - Wing Mounting and Rigging (Doc)
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| Subject: | Wing Mounting and Rigging |
Guys: To fix a "Heavy Wing" on the newer serial numbers (after 41130 or
so) where the ailerons are riveted on instead of bolted on and one
aileron is lower with reference to the upper wing surface (check this
simply by laying a straight edge on top of the wing extending aft over
the aileron and see that the straight edge is parallel and touches the
top skin of the aileron), Vans recommends placing a "wedge" on the
bottom side of the low aileron. A much simpler and better way to move
the aileron up to match the other side (or lower a higher aileron) is to
buy (4) steel 3/16" fender washers and rivet them to the outside of the
hinge arms ( (2) #3 rivets per washer) with the 3/16" hole in the
washers located where the 3/16" hinge bolt should be to move the aileron
up (or down) to make it match the other side. Then drill through the
washer holes for the hinge bolts. You will have oblong (or two) holes
in the hinge arms but the washers will act as new properly aligned hinge
pin mounts.
After the ailerons are matched, you can mount the wings according
to "Setting Wing Incidence" instructions. After building two 10's, here
are some tips that I learned.
The drop in the angle (slope) of the wing should be 5 1/2" to 6"
from the front wing spar to the rear wing spar with a level straight
edge (as described in Vans instructions). This angle should be the same
on each wing. The greater the angle of incidence, the lower the nose
will be in flight and the harder it will be to flare on landing. Having
built two RV10's, I would recommend 5 3/8"--5 7/8" more than 5
3/4"--6". If you do not have hardly enough elevator control (the stick
is all the way back with maximum nose up trim) on landing, you can add
10# of lead on top of the empennage between the horizontal stabilizer ribs.
With the wings attached to the main spar (before drilling the rear
wing spar), lay a long straight edge across the top of the wing from the
forward spar to the trailing edge of the flaps with the flaps in their
up position (you will have to attach the flap push rods to the flap
control bell crank). There should be about 1/4" clearance under the
straight edge above the leading edge of the flap where it slides under
the top skin of the wing.
The ailerons should match the flaps and wing tips. If the flaps
or ailerons are too high, you will have extra drag on the wing which
will cost you cruise air speed. Adding a "wedge" to an aileron also
adds drag.
The flaps do not have to match the fuselage perfectly for good
flight characteristics. Matching the flaps in their neutral position to
their ailerons is most important (more so than matching them to the wing
tips).
Doc RV10 #41087 and #41862
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