Great-planes Spectra Electric Sailplane Kit - GPMA0540 User Manual Page 31
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D 3. A piece of self adhesive foam rubber weather strip-
ping can be applied to the front of the fuselage bottom to help
protect it from getting nicked up during landings.
D 4. The canopy is held in place with a rubber band.
Loop a medium size rubber band through the cut-out in the
canopy back. Thread the rubber band through itself and then
hook it on one of the little hooks on former F3. To remove the
canopy, pick up on the back until the front is clear of the
dowel. To put the canopy back on just do the opposite.
D 5. Install the prop assembly onto the motor shaft.
Make sure the set screw is securely tightened against the flat
on the shaft and a drop of medium strength thread locker on
the set screw is also a good idea.
and allow it to go on under. When it starts to climb up the back
of the "outside loop" its airspeed will drop and you can pull
out with some up elevator or roll out with full rudder. If you
don't have plenty of altitude, gently pull out with up elevator
but be careful and don't "jerk" it up or you may over stress
the wing.
D 2. With the wing attached to the fuselage, and all parts
of the model installed (ready to fly, including batteries and
the prop assembly), lift the model by picking it up with a
finger on each bottom inner spar. If the tail drops when you
lift, the model is "tail heavy'' and you must add weight to the
nose to balance. If the nose drops, it is "nose heavy" and you
must add weight to the tail to balance. The model should
hang with a slight nose down attitude. The first thing to try
when balancing the SPECTRA is moving the receiver battery
tray. Slide it forward to correct a tail heavy plane and slide it
backwards to correct a nose heavy plane. If the shifting of the
receiver battery alone is not enough you may have to add
some lead to either the nose or tail to achieve the proper
balance. When you have the plane balanced, glue the
receiver battery tray in place with thin CA. DO NOT
ATTEMPT TO FLY WITHOUT FIRST ACHIEVING
THE PROPER BALANCE!
PRE-FLIGHT
BALANCE THE MODEL
NOTE: This section is VERY important and must not be
omitted! A model that is not properly balanced will be
unstable and possibly un-flyable.
D 1. The balance point (CG-Center of Gravity) is shown
on the plan, and is located under the spar. This is the balance
point at which your model should balance for your first
flights. Later, you may wish to shift the balance up to 3/8"
behind the spar to change the flying characteristics. Moving
the CG forward of the spar will add some stability but it will
decrease the overall performance of the sailplane and make
it stall easier at slower speeds. Moving the balance behind
the spar makes the model more agile with a lighter and
snappier "feel" and improves the sailplane's response to air
currents. It also makes the model less stable and can cause
the sailplane to "tuck under" or dive when its flying speed
increases. If you fly the SPECTRA with its CG behind the
spar (usually only contest flying), pay close attention and do
not let it gain excessive speed. If it does tuck under and you
have plenty of altitude, give the plane a little down elevator
CHARGE THE BATTERIES
Follow the battery charging procedures in your radio
instruction manual. You should always charge your trans-
mitter and receiver batteries the night before you go flying,
and at other times as recommended by the radio manufac-
turer.
Fully charge your flight battery following the instruc-
tions that came with the battery and the charger.
FIND A SAFE PLACE TO FLY
The best place to fly your R/C model is an AMA
(Academy of Model Aeronautics) chartered club field. Ask
your hobby shop dealer if there is such a club in your area and
join. Club fields are set up for R/C flying which makes your
outing safer and more enjoyable. The AMA can also tell you
the name of a club in your area. We recommend that you join
AMA and a local club so you can have a safe place to fly and
also have insurance to cover you in case of a flying accident.
(The AMA address is listed on the front cover of this instruc-
tion book).
31
- INSTRUCTIONS 1
- WARNING! THIS IS NOT A TOY! 1
- DIE PATTERNS 3
- INTRODUCTION 4
- A WORD ABOUT ADHESIVES 5
- "TAIL FEATHERS" 6
- WING ASSEMBLY 9
- Work Surface 10
- bottom sheet 12
- 1/16" 12
- BUILD THE OUTER WING PANEL 13
- NOTE TAPER OF WEBS 14
- JOIN THE INNER AND OUTER WING 15
- FINAL WING ASSEMBLY 16
- FUSELAGE ASSEMBLY 19
- ASSEMBLE THE CANOPY 22
- INSTALL MOTOR 24
- FINAL ASSEMBLY 25
- CHECKING FOR WARPS 26
- ASSEMBLE PUSHRODS 27
- THE FULL THROTTLE POSITION 28
- Nylon Clevis 29
- RADIO SET-UP 30
- PRE-FLIGHT 31
- AMA SAFETY CODE 32
- YOUR FIRST FLIGHT 33
- THERMAL FLYING 34
- TYPICAL THERMAL 34
- SOME IMPORTANT SOARING TIPS 35
- DYNAMIC BRAKE MODIFICATION 35
- PARTS LIST 36
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