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1. 02:17 PM - Pesky heavy left wing (hotwheels)
2. 02:20 PM - Re: Pesky heavy left wing (hotwheels)
3. 02:51 PM - Re: Pesky heavy left wing (Jesse Saint)
4. 03:51 PM - Re: Pesky heavy left wing (Carl Froehlich)
5. 04:04 PM - Re: Re: Pesky heavy left wing (Rene)
Message 1
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| Subject: | Pesky heavy left wing |
I noted the presence of a heavy left wing since first flight nearly a month ago.
My rudder is a bit off, but even when the ball is centered, there's a roll moment
that cannot be ignored.
During my build it was pointed out that one flap didn't match the other. That is,
there is a twist. Now that the plane is flying I don't recall which is which
(figures). I'm thinking this should be addressed first before going down the
path of adding trim wedges or adjusting ailerons. Incidentally, I notice any
roll when flaps are at 1/2 or full down positions. Hmmmm.
Looking at each flap at reflex, I can see that one of the inboard edges is flush
with the underside of the fuse while the other is above the underside edge.
Can someone who's flying maybe chime in as to what the "normal" position might
be? Maybe a photo or two of the inboard edge would help?
Other than the roll, I'm finding the -10 is really fun to fly!
Thanks,
Jay
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393092#393092
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| Subject: | Re: Pesky heavy left wing |
Should have said "Incidentally, I DON'T notice any roll when flaps are at 1/2 or
full down positions."
Jay
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393093#393093
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| Subject: | Re: Pesky heavy left wing |
The bottom skin of the flap should be flush with the bottom skin of the fuse. You
could rig the high one down to flush, but you can see the twist easily by following
the rivet line of the flap spar with the trailing edge of the wing top
skin. They should be the same the whole way down the flap. If they are not,
there is a twist in the flap. Unfortunately, if the flap is twisted, then the
aileron will be rigged wrong (rigged to the flap), and more importantly, the wingtip
will be rigged wrong (rigged to the aileron). You can counter a roll either
with trim or with the rigging of the flaps when retracted, although a flap
twist will cause a loss in cruise speed.
Jesse Saint
I-TEC, Inc.
jesse@itecusa.org
www.itecusa.org
www.mavericklsa.com
C: 352-427-0285
O: 352-465-4545
F: 815-377-3694
Sent from my iPhone
On Jan 26, 2013, at 5:16 PM, "hotwheels" <jaybrinkmeyer@yahoo.com> wrote:
>
> I noted the presence of a heavy left wing since first flight nearly a month ago.
My rudder is a bit off, but even when the ball is centered, there's a roll
moment that cannot be ignored.
>
> During my build it was pointed out that one flap didn't match the other. That
is, there is a twist. Now that the plane is flying I don't recall which is which
(figures). I'm thinking this should be addressed first before going down the
path of adding trim wedges or adjusting ailerons. Incidentally, I notice any
roll when flaps are at 1/2 or full down positions. Hmmmm.
>
> Looking at each flap at reflex, I can see that one of the inboard edges is flush
with the underside of the fuse while the other is above the underside edge.
Can someone who's flying maybe chime in as to what the "normal" position might
be? Maybe a photo or two of the inboard edge would help?
>
> Other than the roll, I'm finding the -10 is really fun to fly!
>
> Thanks,
> Jay
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=393092#393092
>
>
>
>
>
>
>
>
>
>
Message 4
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| Subject: | Pesky heavy left wing |
Recommend first rigging the flaps to be exactly correct - both flush
with
the underside of the fuselage. From there start your other rigging
checks.
Hopefully this will get you on the right path. If you find you do have
a
twisted flap, then don=92t rig the aileron tailing edge to be in line
with the
offending flap. Rig the ailerons using a straight edge such that they
match. This will mitigate a twisted flap problem.
Below are a couple of earlier posts I made on rigging that you may find
useful.
Carl
60 hours on the RV-10 and one long cross country. Here are some recent
tweaks that I=92ve incorporated:
- Added a .063=94 shim under the forward HS spar. This moved
the
elevators to a better trail position in cruise. I had a .040=94 shim in
for
10 hours or so. It helped but was not quite enough. Even with this
larger
shim I have more nose up trim authority than I will ever need. With
anything other than forward CG conditions however the elevators are
still
slightly trailing edge down. This calls for a larger shim but the
.063=94 is
about all I want to do for now as more may force an empennage fairing
adjustment and/or re-hanging the rudder. For those wondering, my W&B is
typical of other RV-10s.
- Right wing slightly heavy. Not so bad that aileron trim
would
not fix, but not right. After some careful measurements I found the
right
aileron inboard hinge placed the aileron slightly high (as compared to
the
outboard hinge and the left aileron). I lowered the inboard side of the
aileron .032=94 or so and this resolved the wing heavy issue.
- Ball not centered. I chased my tail on this for some time.
With
the wheel pants and gear leg fairing off the ball is dead center.
Various
tweaks on the pants and fairings either had the ball =BD out left or
right.
After several tries it is now dead center (and just finished final pant
and
fairing paint today). Some take-aways for those working this issue:
o The fairing adjustments are far more critical than the wheel pants
at
affecting the ball. Set the wheel pants as close as possible, then make
all
adjustments to the fairings after that.
o The Van=92s instructions lead you to think you can mount the wheel
pants
with the plane on the gear. I don=92t recommend this.
o You can never be too accurate setting up to check the fairing rig.
A
1/16=94 move of the fairings trailing edge equals =BC ball or so.
- Don=92t paint the pants or fairings until after you are
flying.
- Add the =93reinforcement glass=94 to the nose gear wheel pant
(there
was a recent thread on this). After mine cracked, I added two layers of
carbon fiber to the inside, ground out the crack and filled it in with
flox,
sanded then two layers of regular glass on the outside over the crack.
This
was followed by the normal =93micro-balloon and sand until you puke=94
routine.
As already mentioned, check the aileron height (compare left/right at
inboard and outboard attach points using a straight edge running aft off
the
wing). A very small difference between aileron heights will make a big
difference ' and just how heavy the wing is will be dependent on
speed. I
found this problem in several heavy wing RVs, including my RV-8A.
Moving
the offending attachment point completely solve my problem on the 8A.
Other things to look at:
- Do not assume that if the ailerons (in neutral position) are
even
with the flaps (in reflex position) that they are rigged correctly as
there
may be a slight twist in the flap. Put the flaps in the reflex
position,
clamp one aileron to the flap, then compare using a straight edge
running
aft off the wing the two ailerons deflection. If there is a difference,
adjust the push rods until they are exactly the same.
- Do the same straight edge measurement on the flaps to
compare.
If you do have a slight twist in a flap, I would expect that you can
compensate for it if the ailerons are symmetrically rigged as they
provide
the higher moment arm.
- Once you have the ailerons at the same deflection, then look
at
the wingtips. When building the wingtips you can move the wingtip
tailing
edge up or down a good quarter of an inch when fitting the aft rib.
Of note, the easy tone in Van=92s instructions on rigging the aircraft
never
seemed right for me. After chasing my tail on a heavy wing I went back
to
basics as discussed above and found the small difference in aileron
mount
height. Rigging is a big deal ' and something that few will get right
on
the first attempt.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of hotwheels
Sent: Saturday, January 26, 2013 5:16 PM
Subject: RV10-List: Pesky heavy left wing
<mailto:jaybrinkmeyer@yahoo.com> jaybrinkmeyer@yahoo.com>
I noted the presence of a heavy left wing since first flight nearly a
month
ago. My rudder is a bit off, but even when the ball is centered, there's
a
roll moment that cannot be ignored.
During my build it was pointed out that one flap didn't match the other.
That is, there is a twist. Now that the plane is flying I don't recall
which
is which (figures). I'm thinking this should be addressed first before
going
down the path of adding trim wedges or adjusting ailerons. Incidentally,
I
notice any roll when flaps are at 1/2 or full down positions. Hmmmm.
Looking at each flap at reflex, I can see that one of the inboard edges
is
flush with the underside of the fuse while the other is above the
underside
edge. Can someone who's flying maybe chime in as to what the "normal"
position might be? Maybe a photo or two of the inboard edge would help?
Other than the roll, I'm finding the -10 is really fun to fly!
Thanks,
Jay
Read this topic online here:
<http://forums.matronics.com/viewtopic.php?p=393092#393092>
http://forums.matronics.com/viewtopic.php?p=393092#393092
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7-Day
http://www.matronics.com/Navigator?RV10-List
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Message 5
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| Subject: | Re: Pesky heavy left wing |
After my first flight....I checked my flaps because I had a heavy left wing.
I used an electronic level and compared the flap to the wing and found one
flap was 1 degree higher than the other when in reflect. I made them
equal....I think it helped. But, I think my bigger problem was fuel
imbalance....I was using the right tank and I am not all that skinny....When
flying solo I always run the left tank down first...
Rene'
N423CF
801-721-6080
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of hotwheels
Sent: Saturday, January 26, 2013 3:21 PM
Subject: RV10-List: Re: Pesky heavy left wing
Should have said "Incidentally, I DON'T notice any roll when flaps are at
1/2 or full down positions."
Jay
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393093#393093
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