Carl Goldberg GPMA1960 User Manual

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Wingspan: 79 in [2005mm]
Wing Area: 674 sq in [43.5 dm2]
Weight: 2.0–2.25 lb [910–1020g]
Wing Loading: 7–8 oz/sq ft [21–24 g/dm2]
Length: 41 in [1040mm]
Radio: 2-channel minimum with 2 servos and standard size receiver

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WARRANTY

Great Planes guarantees this kit to be free from defects in both material and workmanship at the date of purchase.
This warranty does not cover any component parts damaged by use or modifi cation. In no case shall Great Planes’
liability exceed the original cost of the purchased kit. Further, Great Planes reserves the right to change or
modify this warranty without notice.

In that Great Planes has no control over the fi nal assembly or material used for fi nal assembly, no liability shall be
assumed nor accepted for any damage resulting from the use by the user of the fi nal user-assembled product. By
the act of using the user-assembled product, the user accepts all resulting liability.

If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is
advised to return this kit immediately in new and unused condition to the place of purchase.

To make a warranty claim Hobby Services
send the defective part 3002 N. Apollo Dr., Suite 1
or item to Hobby Services Champaign, IL 61822 USA
at this address: [phone] Ext. 5

Include a letter stating your name, return shipping address, as much contact information as possible (daytime
telephone number, fax number, e-mail address), a detailed description of the problem and a photocopy of the
purchase receipt. Upon receipt of the package, the problem will be evaluated as quickly as possible.

READ THROUGH THIS MANUAL BEFORE STARTING CONSTRUCTION. IT CONTAINS IMPORTANT INSTRUCTIONS

AND WARNINGS CONCERNING THE ASSEMBLY AND USE OF THIS MODEL.

TABLE OF CONTENTS

ADDITIONAL ITEMS REQUIRED

THINGS TO CONSIDER . . . . . . . . . . . . . . . . . . . . . . . . . . 2

ADDITIONAL ITEMS REQUIRED . . . . . . . . . . . . . . . . . . . 2

Required Hardware and Accessories . . . . . . . . . . . . . 2

Adhesives and Building Supplies. . . . . . . . . . . . . . . . . 2

Optional Supplies and Tools. . . . . . . . . . . . . . . . . . . . . 2

Building Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

PREPARATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

JOIN THE WING PANELS . . . . . . . . . . . . . . . . . . . . . . . . . 3

INSTALL THE TAIL SECTION . . . . . . . . . . . . . . . . . . . . . . 4

INSTALL THE SERVOS AND PUSHRODS . . . . . . . . . . . . 6

INSTALL THE RECEIVER AND BATTERY . . . . . . . . . . . . 9

FINISH THE MODEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

APPLY THE DECALS . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

GET THE MODEL READY TO FLY . . . . . . . . . . . . . . . . . 10

Check the Control Directions . . . . . . . . . . . . . . . . . . . 10

Set the Control Throws. . . . . . . . . . . . . . . . . . . . . . . . 11

Balance the Model (C.G.). . . . . . . . . . . . . . . . . . . . . . 12

Balance the Model Laterally. . . . . . . . . . . . . . . . . . . . 12

FLYING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Trim Flights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Hi-Start Launch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

First Flights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

THERMAL FLYING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Facts About Thermals . . . . . . . . . . . . . . . . . . . . . . . . 14

Thermal Soaring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

POINTERS FOR CONTEST FLYING. . . . . . . . . . . . . . . . 15

SLOPE SOARING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Slope Landings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Ballasting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

The Gentle Lady ARF sailplane was designed to be a gentle
trainer for the beginning modeler, yet to possess competition
capability in the hands of the experienced glider pilot. The
Gentle Lady is very effi cient and reacts quickly to rising air
(called lift, or thermals). To stay in a thermal, the Gentle Lady
can circle very tightly without falling off. The model has good
penetration into the wind and can “cruise” when desired.

THINGS TO CONSIDER

The Gentle Lady ARF requires a minimum 2-channel radio
system with two 44 oz.-in. [3.2 kg-cm] minimum standard
servos. A charge jack receptacle is optional, but is useful for
quickly checking and recharging the receiver pack without
removing the radio hatch. Recommended part numbers for
the radio components are provided below:

REQUIRED HARDWARE AND ACCESSORIES

This is the list of hardware and accessories required to
fi nish the Gentle Lady ARF. Order numbers are provided
in parentheses:

R/C foam rubber 1/4" [6mm] (HCAQ1000)
Dynafl ite™ Up-Start 2M (DYFP8305)
Hobbico® #64 rubber bands (HCAQ2020)

ADHESIVES AND BUILDING SUPPLIES

This is the list of Adhesives and Building Supplies that are
required to fi nish the Gentle Lady ARF:

1/2 oz. [15g] Thin Pro™ CA (GPMR6001)
Pro 30-minute epoxy (GPMR6047)
Denatured alcohol (for epoxy clean up)
Drill bits: 1/16” [1.6mm], 5/64” [2mm]
#1 Hobby knife (HCAR0105)
#11 blades (5-pack, HCAR0211)
Top Flite® MonoKote® sealing iron (TOPR2100)
Top Flite Hot Sock™ iron cover (TOPR2175)
Panel Line Pen (TOPQ2510)

OPTIONAL SUPPLIES AND TOOLS

Here is a list of optional tools that will help you build the
Gentle Lady ARF:

1/2 oz. [15g] Thick Pro CA– (GPMR6013)
2 oz. [57g] spray CA activator (GPMR6035)
4 oz. [113g] aerosol CA activator (GPMR6034)
CA applicator tips (HCAR3780)
CA debonder (GPMR6039)
Pro 6-minute epoxy (GPMR6045)
Epoxy brushes (GPMR8060)
Mixing sticks (GPMR8055)
Mixing cups (GPMR8056)
Pliers with wire cutter (HCAR0630)
Servo horn drill (HCAR0698)
CG Machine™ (GPMR2400)
Hobbico® fl exible 18" ruler stainless steel (HCAR0460)
Top Flite MonoKote trim seal iron (TOPR2200)
Top Flite MonoKote heat gun (TOPR2000)
Hobbico pin vise 1/16 collet w/6 Bits (HCAR0696)
Great Planes® Clevis Installation Tool (GPMR8030)

Futaba® S3004 Servo Standard (FUTM0004)
Ernst Charge Receptacle Futaba J FM (ERNM3001)

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BUILDING STAND

JOIN THE WING PANELS

A building stand or cradle comes in handy during the build.
We use the Robart Super Stand II (ROBP1402) for all our
projects in R&D, and it can be seen in pictures throughout
this manual.

PREPARATIONS

1. Test fi t the wing joiner into the wing panels. The point
of the “V” shaped joiner should point to the bottom of the
wing panels. Sand the wing joiner or root ribs if necessary
to achieve the correct fi t. The root ribs should join together
tightly with no gaps and the joiner should be just slightly
loose in the joiner pockets to allow room for epoxy.

Remove the tape and separate all the control surfaces.
Use a covering iron with a covering sock on high heat to
tighten the covering if necessary. Apply pressure over sheeted
areas to thoroughly bond the covering to the wood.

2. Use a mixing stick or something similar to coat the
inside of the wing joiner pockets of both wing panels with
30-minute epoxy. Thoroughly coat one half of the wing joiner
with 30-minute epoxy and insert it into the joiner pocket of
one wing panel with the bottom of the “V” shape pointing to
the underside of the wing. Coat the root ribs of both wing
panels and the protruding end of the wing joiner with epoxy.
Slide the wing panels together and use tape to hold them
tight while the epoxy cures.

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3. Center the plywood TE doubler along the TE of the
wing as shown. Use a felt-tip pen to trace around the doubler
onto the wing.

HOW TO CUT COVERING FROM BALSA

Use a soldering iron to cut the covering from the area
beneath the wing bolt plate. The tip of the soldering iron
doesn’t have to be sharp, but a fi ne tip does work best.
Allow the iron to heat fully.

Guide the soldering iron at a rate that will just melt the
covering and not burn into the wood. The hotter the
soldering iron, the faster it must travel to melt a fi ne cut.

Peel off the covering.

4. Use a sharp #11 hobby knife or use the following Expert
Tip to cut the covering 1/16" [1.6mm] inside of the lines you
marked. Use care to cut only the covering and not into the
wood. Use alcohol to wipe away the lines. Glue the doubler
in position with CA or epoxy.

INSTALL THE TAIL SECTION

1. Trim the covering from the rubber band dowel holes in
the sides of the fuselage. Center the dowels in the holes as
shown and glue them in place with CA or epoxy.

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2. Center the wing on the fuselage and secure it using

two crisscrossed rubberbands as shown.

a center mark on the stab is helpful) and make the distance
between the fuse center and stab tips equal on both sides.
Stand back 5-6 ft [1.5 - 1.8m] and view the model from
behind. Confi rm that the stab and wing are parallel. If not,
sand the fuselage as necessary until they are parallel. When
satisfi ed, use a felt-tip pen to trace around the saddle where
it meets the underside of the stab. We used a small clamp to
hold the stab in place while we did this.

4. Remove the stab from the fuse and trim the covering
1/16" [1.6mm] inside the lines you drew. Be careful not to cut
into the wood structure beneath the covering. Use denatured
alcohol to wipe away the lines.

5. Coat the stab saddle on the fuselage and the area
where you removed the covering from the stab with 30-minute
epoxy. Put the stab back into place on the saddle and re­center its position. Use clamps or weights to hold the stab in
place while the epoxy cures. Wipe away any excess epoxy
with alcohol.

3. Place the horizontal stabilizer onto the stab saddle

as shown. Center the stab left and right on the fuse (making

6. Trim the covering from the vertical fi n post as shown.
Be careful not to cut into the wood.

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