On Jan 22, 1:05*am, Gavin Short
wrote:
At 03:36 22 January 2008, Bt wrote:



I do not have our old copy of the L-13 Manuals handy..
they are out at the
club. I only have my L-23 manuals here.

If I remember correctly there should be two 'set screws'
or larger than
standard rivets along the horizontal rivet line of
the fuselage aft of the
wing. These reference points should be easily noticed
and not trusting to
staying with paint.
The maintenance manual should have explicit instructions
for weighing the
L-13.

BT

'Markus Graeber' *wrote in message
.
com...
We need to get a weight and balance done for our Blanik
L-13. The
manuals are not really helpful referring to percentage
of MAC (mean
aerodynamic chord) *for the CG range without saying
how much MAC is
nor where the reference plane/datum is (probably the
wing root rib).

I dug up the FAA type certificate that actually uses
the 'most forward
point on fuselage nose' as the datum and specifies
the arm for front
and back pilot plus the C/G range relative to that
datum which should
give me all the info needed to do the calculations
for minimum single
pilot weight etc. Only problem is that the FAA type
certificate states
that the leveling means for weighing the glider are
'between points
marked on side of fuselage'. Now that is not very
helpful either since
ours has been painted several times and the manual
doesn't make you
any wiser either as to where those points are.

Does anyone out there know how to establish the proper
leveling of the
Blanik L-13 when weighing it or has a better method
for doing the
weight and balance for that glider?

Thanks in advance for any help you can provide,

Markus Graeber
Aeroclub de Colombia

These set screws must be the datum points. *See the
BGA datasheet for the Blanik L-13
*http://www.gliding.co.uk/bgainfo/tec...ets/blanik.pdf

Gavin
Std Cirrus, CNN now G-SCNN, #173- Hide quoted text -

- Show quoted text -

I love it... "1000:51 at top of aft fuselage". Not 20:1 or anything
simple like that. "Okay George, up on the tail about 2MM. Wait...
no, down a 1MM. Nope, nope back up 1MM... "