Control Surface Masses and Hinge Moments Report
Design Organ. No. EB
11
GmbH & Co. KG
STEMME S10-VT
Page 1
(of 1)
prepared:
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checked:
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Date:
supersedes issue:
Dube
Montag
08.10.1999
Serial No.:
11 -
Registration:
Order No.:
Control
Mass of Control Surface
Hinge Moment of Control Surface
Force at trailing edge
Surface
Rated
kg (lb)
Reading*
kg / lb
Rated
Ncm (lbf ft)
Reading*
Ncm / lbf ft
Rated Value
N (lbf)
Reading
*
N / lbf
left
right
left
right
Measuring point
left
right
Aileron
3.3 (7.28)
to
4.5 (9.92)
132 (0.97)
to
175 (1.28)
9.2 (2.07) to 12.2 (2.74)
at inner operating rod.
r = 14.3 cm (5.63 in.)
Wing Flap 3.5 (7.72)
to
4.7 (10.36)
200 (1.47)
to
272 (1.99)
11.6 (2.61) to 15.8 (3.55)
at operating rod
r = 17.2 cm (6.77 in.)
Elevator** 0.75 (1.65)
to
0.92 (2.0)
28 (0.21)
to
32.5 (0.24)
2.0 (0.45) to 2.7 (0.61)
at inner end rib
0.92 (2.0)
to
1.15 (2.5)
28 (0.21)
to
37.5 (0.27)
r = 14.0 cm (5.51 in.)
Rudder
2.6 (5.73)
to
4.0 (8.82)
182 (1.33)
to
224 (1.64)
4.3 (0.967) to 5.3 (1.19)
at bottom rear corner
r = 42.5 cm (16.7 in.)
*
Units: delete as applicable
, Reading Error: 2.5 % acceptable
**left and right half of elevator separately
Measuring of Static Hinge Moment
The relation between hinge moment and force is:
static hinge moment M = F
•
r,
Wherein F is the force measured at the trailing edge of the control surface, and r is the horizontal distance
between trailing edge and hinge axis. F may be measured with a spring balance or another suitable scale
with an error in measurement not exceeding 2.5%.
The friction of the hinge bearing should be less than 2.5 % of the maximum permissible hinge moment. If the
detached control surface is curved to the front or to the back at least three points should be used to ensure
that the curvature is eliminated and thus cannot falsify the measurement.
Measuring Procedure with Attached Control Surface (not applicable with rudder):
The surface is to be kept in horizontal position by means of the spring balance. Then move the balance
slowly upwards (by hand) and enter the force and direction of movement in the record at which the control
surface overcomes the static friction and starts going (e.g.: 11.2 N ).
After that, starting from the horizontal position again, the spring scale is to be slowly lowered until the control
surface starts moving. Note again force and direction (e.g. 10.8 N ).
Both results must be within the limits given in the above table.
Inspector Statement
The control surface masses and hinge moments are within the allowable ranges and correspond to the
production- and maintenance instruction of the type.
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