18
INSTALLING THE HATCH COVER
❑
23) Locate the hatch cover that you removed
earlier. Using a ruler and a pen, place a mark in the
center of the hatch cover, 3/16” back from the front
edge. See photo # 24 below.
Photo # 24
❑
24) Set the hatch cover into place and align the
edges of the hatch cover with the sides of the fuselage.
❑
25) Using a drill with a 5/64” drill bit, drill a
hole down through the hatch cover and through the
plywood mounting block inside the fuselage.
☛
Be careful not to drill down into the receiver!
❑
26) To hold the hatch cover in place, install and
tighten the 2mm x 10mm wood screw using a # 1
phillips screwdriver. See photo # 25 below.
Photo # 25
BALANCING
TOOLS AND SUPPLIES REQUIRED
❑
12” Straight Edge Ruler
❑
Masking Tape
BALANCING THE THERMALAIRE EP
❑
1) It is critical that your airplane be balanced
correctly. Improper balance will cause your airplane
to lose control and crash. The center of gravity is
located 2-1/2” back from the leading edge of the
wing, at the fuselage sides. This location is
13
15
recommended for initial test flying and training. The
C.G. can be moved aft up to 3/8”, but it is not recom-
mended that the C.G. be located any farther back than
2-7/8” behind the leading edge of the wing.
☛
The Thermalaire EP should be balanced with
the flight battery securely mounted in the fuselage.
❑
2) Install the wing onto the fuselage using the
two nylon bolts to secure it in place. Tear off two
short pieces of masking tape and place them on the
bottom of the wing, 2-1/2” back from the leading
edge, at the fuselage sides.
❑
3) Place your fingers on the masking tape and
carefully lift the airplane. If the nose of the air-
plane falls, the airplane is nose heavy. To correct
this, remove the wing and move the flight battery
back just far enough to bring the airplane into bal-
ance. If the tail of the airplane falls, the airplane is
tail heavy. To correct this, remove the wing and
move the flight battery forward only enough to bring
the airplane into balance. When balanced correctly,
the airplane should sit level or slightly nose down
when you lift it up with your fingers.
☛
Because the battery tray is mounted at an angle,
moving the flight battery up and down the tray will
still cause a change in the C.G.
☛
Once you have flown and become familiar with
the flight characteristics of the Thermalaire EP, the
balance point (C.G.) can be moved aft up to 3/8” to
change the flight performance. Moving the balance
point back will cause the airplane to be more respon-
sive, but less stable; however, moving the C.G. back
will also maximize Thermal-Air EP's thermaling abil-
ity. Do not fly the Thermal-Air EP beyond the
recommended balance range or an uncontrollable
crash could result!
❑
1) We recommend setting up the Thermal-Air
EP using the control throws we recommended in the
pushrod installation steps. Those controls throws are
suggested for initial test flying. If you haven't set up
the control throws yet, we have listed them again on
page # 19.
CONTROL THROWS
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