In the world of Aeromodelling, the simplest aircraft called OHLG aircraft. This aircraft without engine as shown in the image below.
Figure 1: Aircraft OHLG.
This type of aircraft flown by the way was thrown by hand and then flew the aircraft according to the character and nature at the time the aircraft was flown.
How to fly this aircraft as shown in the figure below.
Figure 2: How Flying Aircraft OHLG.
This aircraft is made of material that is very lightweight and strong enough that Balsa wood. Balsa wood can be obtained at stores that sell equipment Aeromodelling.
How to manufacture aircraft OHLG is as follows. Wing shaped like the image below.
Figure 3: Top View from the Wing.
Aerofoil is a cross-section of the wing. Leading edge (LE) is the foremost point of the aerofoil. Trailing edge (LE) is the rearmost point of the aerofoil.
Chord line is a straight line that connects between the LE and TE.
Maximum thickness is 30% of the LE indicated by dashed lines. Aspect Ratio (AR) is a wing slenderness factor.
AR at OHLG aircraft by 5 to 12. While the AR in an aircraft that is controlled by radio (Radio Controlled RC Airplanes) by 7 to 10.
The formula is the aspect ratio AR = b ^ 2 / S where b is the wingspan or the distance between the wingtip to the other wing on wing. S is the area of the wing. To determine S with trapezoidal approach below.
Figure 4: Trapezoid.
From the picture above then S is calculated using the equation S = (a + b) * t / 2
Figure 5: Aerofoil.
Aerofoil made like Figure 5 above. Maximum thickness is 30% of LE. Aerofoil shape is so determining the ability of aircraft to generate lift force.
Figure 6: Balsa Hardware mounted on LE.
In the LE along the wing should be used Balsa wood is Hard as shown in figure 6. Installation of Hard Balsa done before making wing.
Hard Balsa fitting ends on the wing during flight to the amplifier so that the plane is not easily damaged because of collision with hard objects.
Next enter the stage of manufacture of the fuselage. The fuselage is made of Balsa wood is hard and shaped like the image below.
Figure 7: Body Aircraft OHLG.
The distance the nose to the LE of the wing chord. Fuselas length of 5.25 multiplied by the wing chord.
Then create a stabilo and fin. Stabilo is the horizontal tail while fin is the vertical tail. Stabilo and fin are made following the instructions below.
Figure 8: Stabilo and Fin.
Stabilo wingspan of 33.3% of the wingspan. Stabilo chord of 75% of wing chord. Wide fin 33.3% of the stabilo area as shown in figure 8 (shaded part).
Figure 9: Gap between Wing and Stabilo.
Installation of a stabilo on the body with a gap between the wing and the stabilo around 1.5 to 2 cm.
The next step is mounting the amplifier on the wing. The purpose of this amplifier installation so that the wing is not damaged when it made the flight.
Figure 10: The amplifier on the Wing.
Amplifier installation done under the wing surface as shown in Figure 10. Direction of the wing amplifier fiber that is parallel to the fuselage.
Figure 11: Installation of Aircraft fin.
Installation of an aircraft fin as shown in Figure 11. In this way more easily in moving the rudder and elevator.
To get the aircraft's outer skin silky smooth refinement performed. Smoothing using a plastic that is dissolved using a solvent of plastic. Usually plastic solvent that is used branded Herin.
Smoothing is done like painting wood and sanding step is then performed.
The next step considers the aircraft to determine the location of the center of mass or center of gravity (cg). This step is often called the Weight and Balance (WAB).
WAB goal to get the cg location as far as 30% of TE as shown in Figure 12. Weight settings by adding a thin metal on the nose of this plane.
Figure 12: Position c.g against TE.
