The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008 
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stable images even at the high altitude available 
Figure 1. The Monitor on the Ground 
Name 
FREYA EVO 90 grade 
Length 
1,375 mm 
Hight 
453 mm 
Width 
200 mm 
Main roter 
diameter 
1,561 mm 
Tail roter 
diameter 
270 mm 
Gear ratio 
7.9 : 1 : 4.77 
Maximum 
4,900 g 
payload weight 
Maximum 
operation radius 
200m(depends on flight conditions) 
Endurance 
approximate 10-20 minutes 
Typical 
Applications 
photogrammetry, surveying, cartography, 
archeology, environmental protection, 
arhitecture, civil engineering, marketing 
Table 1. Specifications of RC Helicopter 
RC helicopter used in this study was FREYA EVO 90grade of 
HIROBO Company. The shape and the specification are as per 
Figure 2 and Table 1. RC helicopter used in this study was 
lightly and solidly made with the high impact materials and 
propels the main rotor and the tail rotor with a Glow 
engine(14.95cc) like Table 2. The capacity of fuel was as much 
as it flies for about 10-20 minutes generally 
And the proportional, the radio controller which can control the 
camera, is designed to be able to make the axis sloped in the 
above and the below(about 90°) and in the left and the 
right( 360°) in order to control the image photographed by the 
camera on the ground. And the Figure 2(b), as the take-off and 
landing equipment of helicopter, is the part of grate composed 
of the light aluminum and the small(35mm) camera and the 
digital video camera can be set on such camera installing bar to 
be used, and when the middle(6x4.5cm), panorama(6 x 12cm), 
DV(6mm 3CCD) and 35mm Film Movie, etc are setup, the 
helicopter with gasoline engine(26cc) as the plane of helicopter 
with the excellent capability may be selected. 
Figure 2. Model of RC Helicopter 
Name 
O.S MAX 91 SX H RING C-SPEC PS 
Displacement 
volume 
14.95 cc 
BORE 
27.7 mm 
Stroke 
24.8 mm 
Output 
3.1ps/16,000 rpm 
RPM 
2,000-16,000 rmp 
Weight 
581 g 
Table 2. Specifications of RC Helicopter 
And the proportional, the radio controller which can control the 
camera, is designed to be able to make the axis sloped in the 
above and the below(about 90°) and in the left and the 
right( 360°) in order to control the image photographed by the 
camera on the ground. And the Figure 3, as the take-off and 
landing equipment of helicopter, is the part of grate composed 
of the light aluminum and the small(35mm) camera and the 
digital video camera can be set on such camera installing bar to 
be used, and when the middle(6 x 4.5cm), panorama(6xl2cm), 
DV(6mm 3CCD) and 35mm Film Movie, etc are setup, the 
helicopter with gasoline engine(26cc) as the plane of helicopter 
with the excellent capability may be selected. 
Figure 3. Construction of gimbal mount