Excessive friction in the aiteron circuit in SZD-55

- Show quoted text -

The sagging ailerons are explained it the rigging manual that is in
the maintenance section of your flight manual. The 55 has a builtin
-2.5dig. set in each side. See Fig 1 page 31.. As for them being
heavy? In the technical service manual para 2.2.7. Parmissible
friction in the control system. Aileron 0.2 +/- 1.0 daN ( 0.44 +/-
2.2 lbs.) I would look for a bad bearing in the linkages. I feel that
the ailerons on my ship are very light.

Hi

Thank you for pointing me to the correct page on the manual. The
2.5deg translate to a bit over 5mm which is pretty much what it is. I
am assuming that the permissible forces are quoted when stationary,
but that is not my problem. The aileron only load up in flight.
Essentially the stick never returns to the centre by itself, when
cruising with the the stick in the centre, I can tap it pretty hard
and it does not budge. I am encouraged to hear that ailerons are
light, so I should be able to get it fixed.

Cheers

paul

Did you check the clearance between ailerons and wing (spanwise) under load?

Bert

"pb2525" wrote in message
...


- Show quoted text -

The sagging ailerons are explained it the rigging manual that is in
the maintenance section of your flight manual. The 55 has a builtin
-2.5dig. set in each side. See Fig 1 page 31.. As for them being
heavy? In the technical service manual para 2.2.7. Parmissible
friction in the control system. Aileron 0.2 +/- 1.0 daN ( 0.44 +/-
2.2 lbs.) I would look for a bad bearing in the linkages. I feel that
the ailerons on my ship are very light.

Hi

Thank you for pointing me to the correct page on the manual. The
2.5deg translate to a bit over 5mm which is pretty much what it is. I
am assuming that the permissible forces are quoted when stationary,
but that is not my problem. The aileron only load up in flight.
Essentially the stick never returns to the centre by itself, when
cruising with the the stick in the centre, I can tap it pretty hard
and it does not budge. I am encouraged to hear that ailerons are
light, so I should be able to get it fixed.

Cheers

paul

Hi Bert

No I did not, but I will add it to the things to check. However, the
problem seems to be friction, rather then anything else. The reason I
say that is that it takes more force to start the stick moving, then
it is to keep it moving (static friction requires more force to
overcome then sliding friction).

Cheers

Paul

On Apr 21, 11:19 pm, "Bert Willing" bw_no_spam_ple...@tango-
whisky.com wrote:
Did you check the clearance between ailerons and wing (spanwise) under load?

Bert

"pb2525" wrote in message

...



- Show quoted text -

The sagging ailerons are explained it the rigging manual that is in
the maintenance section of your flight manual. The 55 has a builtin
-2.5dig. set in each side. See Fig 1 page 31.. As for them being
heavy? In the technical service manual para 2.2.7. Parmissible
friction in the control system. Aileron 0.2 +/- 1.0 daN ( 0.44 +/-
2.2 lbs.) I would look for a bad bearing in the linkages. I feel that
the ailerons on my ship are very light.

Hi

Thank you for pointing me to the correct page on the manual. The
2.5deg translate to a bit over 5mm which is pretty much what it is. I
am assuming that the permissible forces are quoted when stationary,
but that is not my problem. The aileron only load up in flight.
Essentially the stick never returns to the centre by itself, when
cruising with the the stick in the centre, I can tap it pretty hard
and it does not budge. I am encouraged to hear that ailerons are
light, so I should be able to get it fixed.

Cheers

paul