18
Hangar 9 PT-19 CL Assembly Manual
Center of Gravity
An important part of preparing the aircraft for flight
is properly balancing the model.
Caution: Do not inadvertently skip this step!
The recommended Center of Gravity (CG) location for the
PT-19 CL is 2
1
/
2
-inch (63mm) back from the leading edge of
the wing. Mark the location for the Center of Gravity on the
top of the wing next to the fuselage as shown.
When balancing your PT-19 CL, support the plane inverted at
the marks made on the top of the wing with your fingers or
a commercially available balancing stand. This is the correct
balance point for your model. You might find you may be
required to add a small amount of weight to either the front
or back of the fuselage to achieve the correct balance.
After the first flights, the CG position can be adjusted for
your personal preference.
Daily Flight Checks
FlyING SITe
Your flying area should be about 150’ diameter clear circle,
with a smooth takeoff and landing surface. DO NOT FLY
NEAR POWERLINES!!! Contact between the power lines and
your flying lines can result in death. Be sure your flying area
is clear and that transient walkers will not inadvertently walk
through your flight path. It is highly recommended to mark
your flying circle to warn others of the path of your aircraft
to prevent injury to spectators.
HARdwARe CHeCkS
Check all hardware (linkages, screws, nuts, and bolts) prior
to each day’s flight. Be sure that binding does not occur and
that all parts are properly secured.
PRePARING FoR FlIGHT
Control Lines. Your PT-19 comes to you with a set of
.015 x 60’ 7-strand braided stainless steel cables for flying
use. Attach these to the airplane with the supplied clips, and
unroll the lines from the reel. Attach the other end of the
lines to your handle, making sure that you have attached the
‘up’ line to the ‘up’ side of the handle, and vice versa for the
down line.
When flying, always inspect your control line for damage,
and discard any sets that have broken cables, or permanent
kinks and bends in them. These areas are very weak and the
possibility exists that the line will break in flight, causing the
loss of your model. Keep your lines clean with alcohol and
stored on the reel supplied, and you should get many flights
from a set of lines.
Fuel
The fuel recommended is 5–15% nitro fuel, with 18% oil.
The fuel tank we supplied is only about
2
1
/
2
ounces …
perfect for those of you who are just getting back into the
hobby and don’t (can’t) spin in a circle for 5 minutes. A full
fuel tank will give you about
3
1
/
2
minutes of flying time.
The higher the nitro – the shorter the run time, the lower
the nitro, the longer the run time. To increase flight times
it is suggested to use a larger tank from Dubro or Sullivan.
(DUB404 or SUL425).
PRoPelleRS
For the first times around the circle, a good 10 x 6 or
10 x 5 prop, set at about 9500 rpm on the ground, will
give you a comfortable flight speed. The EVOE100P trainer
propeller (three blade 10.5 x 4.5) does a really nice job of
flying this airplane and you should have a lot of fun with this
combination. Propeller choice is always up to the pilot.
FIRST FlIGHTS
Remember, it does not take large movements to fly a control
line airplane. For the first couple of flights concentrate on
keeping your wrist and forearm locked into a position, and
move your hand up and down at the elbow. This will provide
the needed amount of control movement while stabilizing the
airplane and leading to a very successful flight. If you start
by moving your wrist up and down, the airplane will respond
very rapidly and it could result in damage. Take your time
and relearn the skills you used to have … and you’ll have a
blast again!