Make bowden exit allso in the part 16
TAIL BOOM SUBASSEMBLY 15
16 16 Bend if necessary
Carve "fake dashboard"
5-6mm balsa triangular strip
14
Sand towards motor mount contour Sand flat before glueing a motor mount
Route aileron servo wires trough this slot!
H HORIZONTAL TAIL ASSEMBLY
8 Sand paralel
Glue 3 pieces of 6 mm thick balsa and carve&sand to proper shape (outside and inside)
4
6
10
3
6
Servo tray
2
7
35
5
11
Top view
25
1 36
See drawing 09
SERVO INSTALLATION DETAIL
C.G. range 40-48
8
FUSELAGE ASSEMBLING STEPS See drawing 07 2
Forward C.G. setting generally means that model will be stable, wil recover fast from a dive, will be more spin resistant and will not react agresive when hit the thermall.
Rudder servo
Scrap balsa piece to hold Fuselage sides apart temporary.
Side view
5
This former protect the motor against a battery at crash
3
VERTICAL TAIL ASSEMBLY See drawing 10
Check clearance for motor instalation
INTERNAL SUBASSEMBLY
11
6 Servo tray
Fuselage bottom side: glue ply by ply. No need for any "mold"
Prevent servo arms and pushrods to strike one against each other at extreme throws!
1
4
Schematics of hinging using clear adhesive tape.
7
2
8-10mm balsa triangular strip
12
Sand transition, or use light filler
B 1mm
G
D
C.G. range 40-48
9
connector
Metal bolt M3 x 20
Doubler if necessary.
F
E
CANOPY See drawing 08
C
18
B
30
hard foam
Ballast "compartment" if model came out nose heavy. Cut a slot from bellow and glue in thin lead plate. Tape the slot.
16 15
Fuselage reference line (centerline of tail boom tube)
BEC ESC
16
1,5 -2A 30A
ZIPPY 1500MAH 3S1P 14
A
RX 4CH min. ASSAN X8R7
C.G.
17
Use short piece of bowden and CA to secure pushrod.
FWD canopy latching: velcro or magnets
19
10
TAIL BOOM viewed from top
ELECTRONICS INSTALLATION See drawing 17
FUSELAGE CROSS SECTIONS See drawing 05
13
Grain lengthwise
Slot in the carbon tube for bowden exit (1x elevator, 1x rudder) (use Dremell cutting disc or similar)
Rise pushrod up to clear elevator servo horn! Make slight bends if necessary
done and motor test fitted O.K. 5-6mm balsa triangular strip
~25
Aft C.G. setting generally means that model will react more promptly to controll inputs, will fly less stable, will show flight into thermall more clearly and it will be less spin resistant. More atention to precise flying is required. You should find the C.G. location, that best suits you. That depends on your flying skills, your flying style and weather conditions. Controll deflections shown here were set on the prototype and shown very nice handling and maneuverability. Off course, you can use less or more controll surfaces throw if some other settings make you more comfortable. Aileron differential (aileron goes up more than down) will help to fly more coordinated and will minimize adverse yaw.
Glue motor mount after all inside shaping is
8
Grain crosswise
Rudder
On the prototype I dial 120% of servo travel and use apropriate length of servo horns.
Elevator servo 55
M3 nut epoxied from bellow.
Use short piece of bowden and CA to secure pushrod.
RUDDER: left&right 25 mm at widest point
13
12
Alternative horn connections
AILERON: up 14 mm, down 10 mm, at root of aileron
ELEVATOR: +/- 10 mm at center
8-10mm balsa triangular strip
NOTE: dial ~10-15% elevator down mix on yor TX. Try and set elevator&throtle mix in small steps up until stable and satisfactory climbing path is achieved.
hard foam 20 21
8J 20-30C
cros grain SET PROPER C.G. LOCATION BY MOVING BATTERY, ESC AND RX AFT OR FWD. SECURE COMPONENTS WITH HARD FOAM WHEN ESTABLISHED PROPER C.G.!
lengthvise grain
16
15
0,5mm gap between fuselage and spinner Aero-naut CAM Carbon prop 9x7" shown on the drawing
Sand nice transition to the spinner! All shear webs 2mm vertical grain balsa
3
tapered!
R4
eting 1mm
hard balsa
(Same on both wing tips!)
33
R1
R2
R3 70
5
70
150
3mm plywood "hardspot"
73
R4 Trailing edge, HB 6x
70
Sheeting hard balsa 1 mm, top&bootom
Optional stiffener balsa 2 mm
m balsa, sa nded in tria ngle.
tch rear end of the
see wing cross section
35
, ribs 3-6 m
Tapered heigh to ma
Servo extension cable Install all wiring before covering the wing!
Tipical wing cross section.
RS1
RS1
1
p&botom sh
Wing joiner bushing. Al tube 5/4 mm 79mm long
70 3 28
Cut ribs away at spar section
Aileron: To
Solder wires, or use male/female joint.
Stiffener, balsa
Rise this point 2mm higher than same point at R5 to achieve sufficient
Make from scrap balsa 1mm (top&bottom)
R2
7mm, sand a s show n on cross section Aileron "spar", hard balsa.
Wing spar
2x5
Shear web 2mm vertical grain balsa
Protect against disconnecting!
Trailing edge, HB 6x
Balsa "ribs"
R4
R4
R6
Plywood doubler both sides of spar
Plywood doubler both sides of spar
Sheeting balsa 1 mm, top (Drawing No 06 for details!)
56
D
P R4
R4
P
5 min epoxi (be generous!)
3x5
Glue with 5 min epoxy. You can roll your own tube around steel rod joiner, using a tin from a beer can :)
Wing spar caps spruce; 3x5mm top, 2x5mm bottom.
4,4g/0,8kgcm
59
R4
R4
R4
R4
R5
R4
Sheeting HARD balsa 1 mm, top&bootom
20x20x8,5mm
Scrap balsa, wing joiner stopper.
sheeting
R7
sheeting
R8
R9
R10
R11
R6
Wing tip airfoil template
Sheeting HARD balsa 1 mm, top&bootom
SERVO INSTALATION: - glue balsa (look drawing 14) - install servo and secure it with adhesive tape - make pushrod connection. - cover servo bay with 1mm ply, screw it and tape its perimeter.
17
R4
Polydihedral, no ailerons wing layout, poly break detail.
3mm plywood nose dowel stiffener
0 R4
Centroplan airfoil template
Glass fabric 25-50gsm soaked with CA glue
6
Leading edge, HB 6x7mm, sand a s shown on cross section
Wires so long to reach the RX! ~8-9 cm should be sufficient
tapered!
Trailing edge, HB 3x17mm, sand as shown on cross section.
ribs!
1
7mm, sand a s show
n on cross section
1
For standard size wing (1560mm span) shorten the plan by one rib bay.
359
444
Glass fabric 25-50gsm soaked with CA glue
goes trough this hole. 3mm plywood nose dowel stiffener Note cross section!
1 mm plywood stiffener rib Sheeting balsa 1 mm, TOP.
Section P-P
1
Plywood doubler both sides of spar
Balsa shear web
Optional a ileron desig n
Poly wing only!
from 6mm
Sheeting balsa 1 mm, BOTTOM.
solid balsa
Schematics of hinging of ailerons using clear adhesive tape.
1mm ply doubler
(Note both
cross secti
Note slight undercamber on the bottom aileron surface!
ons!)
Servo cover, 1 mm ply.
Install on both sides of spar at poly break. Cut ribs R4 and R5 to make space for the plywood doublers.
All shear webs 2mm vertical grain balsa
3
6
~8-9 cm should be sufficient Wires so long to reach the RX!
0 R4 Sheeting HARD balsa 1 mm, top&bootom
R11
R9
R8
R10
Wing spar caps spruce; 3x5mm top, 2x5mm bottom.
R7
sheeting
R6
R5
R4
R4
R4
R4
R4
R2
R3
sheeting
SERVO INSTALATION: - look drawing 12 and 14!
20x20x8,5mm
Shear web 2mm vertical grain balsa
70
5
R2
56
35
Section B-B
Sheeting balsa 1 mm, top (Drawing No 06 for details!)
Protect against disconnecting!
D m, sand a s shown
7m Trailing edge, HB 6x
on cross section
le.
ed in triang alsa, sand
73 p&botom Aileron: To
70
-6 mm b alsa, ribs 3 b rd a h m sheting 1m
B
1
3 1mm balsa doubler
17
3mm plywood "hardspot" cross section
59
24
70
Make from scrap balsa 1mm (top&bottom)
Solder wires, or use male/female joint.
RS1
70
4,4g/0,8kgcm Servo extension cable Install all wiring before covering the wing!
RS1
Sheeting hard balsa 1 mm, top&bootom
see wing cross section
Trailing edge, HB 3x17mm, sand as shown on cross section.
1
!
! y l n o g n i w e of Poly
Poly wing only!
1
For standard size wing (1562mm span) shorten the plan by one rib bay.
g Trailing ed
1mm ply doubler
444 Ply 1mm
A B
servo wire exit reinforcment, 1mm plywood on inside of wing. Tipical wing cross section.
Glue with 5 min epoxy. You can roll your own tube around steel rod joiner, using a tin from a beer can :)
A
150 Tape all around
Ply 1mm
3x5
2x5
Sheeting HARD balsa 1 mm, top&bootom
3mm plywood "hardspot"
Make servo cover removable (use adhesive tape & screw)
Glue sheeting permanently.
SERVO COVER
Lower spar cap, spruce 2x5mm
g Trailing ed
!
ng enough
n cr
as shown o
ing witho
e of Poly w
Install on both sides of spar at poly break. Cut ribs R4 and R5 to make space for the plywood doublers.
mm, sand
HB 3x17 ut ailerons
ke ribs lo . Note: ma oss section
17
B 1mm
R1
33
5 min epoxi (be generous!)
make "bed" for a servo with 6mm scrap balsa
Screw here
Leading edge, HB 6x7mm, sand a s shown on cross section
Section A-A
make "bed" for a servo with 6mm scrap balsa
Hole for the servo horn
Upper spar cap, spruce 3x5mm
tapered!
tapered!
R11
1
Optional shape
1
10 cm=100 mm
0 Trailing edge, HB 3x17mm, sand as shown on cross section.
WING SECTION AT AILERON SERVO
Rear wing joint protector. Installed on upper surface when bolting rear of wings.
Balsa doubler (note section)
1
2
0
Balsa doubler (note section)
3
1
Model:
14 mm up
MATERIAL LEGEND: Wing joiner bushing. Al tube 5/4 mm 79mm long. Need 2 pieces.
HINT: use a piece of tin from a beer can and roll couple of times around a steel joiner. Glue last wrap, and Voila!! You have a perfect tube!
10 mm down
R4 IMPORTANT!
aditional rib piece
make 12 pieces
If using medium or soft balsa for wing sheeting, you better install additional rib pieces to lower the rib bay span. Use R4 forward part as a template and cut yourself 12 pieces and glue one at each centroplan rib bay middle. This will prevent wing skin buckling and rise the wing torsional strength.
Shorten servo horn
Shorten aileron horn
"Z" bends, both sides
Set aileron pushrod length at installation
WP Ply B SB HB SP PCB
White Poplar Plywood Balsa wood Soft balsa wood Hard balsa wood Spruce wood PCB composite material
Drawing:
MS-UL-Design
4
5
2
6
7
8
3
9
10 cm
4"
GUPPY 2 Assembly drawing No1
01
Designed by Ultralajt, jan.2009 Note: Redrawn, aug.2012 Plans for personal use only. No commercial use allowed unless written permission from the author.
