Seagull Models JUMPER 25 User manual

Jumper 25

HIGH WING TRAINER - ENGINE SIZE .25 - 2STROKE

Jumper 25

HIGH WING TRAINER - ENGINE SIZE .25 - 2STROKE

Jumper 25

Hand-made Almost Ready to Fly R/C Model Aircraft

ASSEMBLY MANUAL

Additional items required

Engine

4 Channel or greater Radio Control system

Glues

Tools

Starting Equipment

Speci cations

Wingspan

______________________________

, 157cm

Wing area

____________________________

1256Cm2

Approximate  ying weight

__________________

, 2.5kg

Recommended engine size

___

0.25-0.32 cu. ins 2-stroke

Recommended R/C

_____________

4 channel minimum

Flying skill level

__________________

High wing Trainer

Kit features

•

Ready-made—minimal assembly &  nishing required

•

Ready-covered—including decals, trim & covering

•

Factory-installed pushrod

•

Factory-installed metal engine mount

•

Factory-pinned & glued control surface hinges for ultimate safety

•

Comprehensive hardware pack including wheels, tank, spats,undercarriage& spinner

•

Photo-illustrated step-by-step Assembly Manual

Made in Vietnam

Distributed throughout Europe by:

J Perkins Distribution Ltd, Kent, UK.

http://www.jperkinsdistribution.co.uk

Jumper 25

Instruction Man u al

Thank you for choosing the

Jumper 25

ARTF by SEAGULL MODELS. The

Jumper 25

was designed

with the in ter me di ate/advanced sport  yer in mind. It is a High-wing aeroplane which is easy to

 y and quick to assemble. The airframe is con ven tion al ly built using balsa, plywood and veneer

to make it stronger than the average ARTF , yet the design allows the aeroplane to be kept light.

You will  nd that most of the work has been done for you already. The pushrods are pre-made to

the correct lengths, the motor mount has been  tted and the hinges are pre-installed and pinned

for security. Flying the

Jumper 25

is simply a joy.

This instruction manual is designed to help you build a great  ying aeroplane. Please read this

manual thoroughly before starting assembly of your

Jumper 25

. Use the parts listing below to

identify all parts.

We encourage you to let us know your comments. Fill out the consumer feedback survey at the back of

this manual, send us a letter or contact us at [email protected]. or [email protected](Australi

a) or [email protected](Vietnam).

Warning

Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it is capable of

causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU ASSUME ALL RISK &

RE SPON SI BIL I TY.

If you are inexperienced with basic R/C  ight we strongly recommend you contact your R/C supplier

and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training procedures

designed to help the new pilot on his way to successful R/C  ight. They will also be able to advise on any

insurance and safety regulations that may apply.



25-32 2-stroke engine



4-channel radio with four servos



Glow plug to suit engine



Propeller to suit engine



Protective foam rubber for radio

system



Silicone fuel line



Stick-on weights for balance

(If necessary)



Thick cyanoacrylate glue



30 minute epoxy



5 minute epoxy



Hand or electric drill



Assorted drill bits



Modelling knife



Straight edge ruler



2mm ball driver



Phillips head screwdriver



220 grit sandpaper



90° square or builder’s triangle



Wire cutters



Masking tape & T-pins



Thread-lock



Paper towels

FUSELAGE ASSEMBLY



(1) Fuselage



(1) Pre-installed throttle pushrod &

tube



(1) Pre-installed servo tray



(1) Pre-installed motor mount



(1) Pre-installed rudder pushrod



(1) Pre-installed elevator pushrod

WING ASSEMBLY



(1) Right wing half with pre-installed

aileron



(1) Left wing half with pre-installed

aileron



(1) Plywood wing dihedral brace



(1) Covering strip for centre section

joint

TAIL SECTION ASSEMBLY



(1) Vertical stabilizer with pre-in-

stalled rudder



(1) Horizontal stabilizer with pre-in-

stalled elevator halves

Jumper 25

Instruction Man u al

HARDWARE PACK



(1) Moulded plastic fuel tank



(1) Pre-assembled fuel tank stop per



(1) Weighted fuel pick-up (clunk)



(2) Main wheels



(1) Undercarriage



(2) 3 x 12mm metal screws for spin ner



(4) 3 x 250mm metal screws for main

u/c



(1) Spinner with backplate



(4) Wheel collars with four 3 x 18mm set

screws



(2) 140mm long threaded rod for aileron

pushrods



(5) Nylon clevises



(1) Adjustable servo connector



(5) Nylon snap keepers



(5) 3 x 350mm machine screws, washers

& nuts



(5) Nylon adjustable control horns



(2) Nylon wing bolts



(4) 4 x 30mm machine screws



(8) 4mm washers



(4) 4mm nuts

NOTE:

To avoid scratching your new aer o plane

we sug gest that you cover your work-

bench with an old towel. Keep a couple

of jars or bowls handy to hold the small

parts after you open the bags.

Please trial  t all parts. Make sure you

have the correct parts and that they  t

and are aligned prop er ly be fore gluing!

This will ensure proper as sem bly as the

Jumper 25

is made from nat u ral ma-

terials and minor ad just ments may have

to be made.

The paint and plastic parts used in this kit

are fuel proof. How ev er, they are not tol-

erant of many harsh chem i cals in clud ing

the fol low ing: paint thinner, cyano-acr-

ylate glue ac cel er a tor, cy anoacr ylate

glue de-bonder and acetone. Do not let

these chem i cals come in contact with the

colours on the covering and the plas tic

parts.

WING ASSEMBLY

NOTE:

We highly recommend using 30 minute

epoxy as it is stronger and provides

more working time, al low ing the builder

to properly align the parts. Using fast cure

epoxy when joining the wing halves could



Test  t the dihedral brace into each wing

half. The brace should slide in easily up

to the centreline that you drew. If not, use

220 grit sandpaper with a sanding block

and sand down the edges and ends of

the brace until it  ts properly.

NOTE:

The dihedral brace is cut in the shape

of a “V”. This shape gives the wing the

correct dihedral angle. Make sure you

do not test  t the brace upside down.



Remove the brace when sat is  ed with

its  t in each wing half. Coat both sides

of one half of the di he dral brace with 30

minute epoxy. Next, pour some epoxy into

the dihedral box in one wing panel. Make

sure you cover the top and bottom as well

as the sides of the dihedral brace. Use

enough epoxy to  ll any gaps.



Insert the dihedral brace into the di he dral

box up to the centreline. With paper tow-

els wipe off any ex cess epoxy that may

have squeezed out of the joint .

result in the glue drying before the wing

halves are aligned properly which may

result in failure of the wing cen tre section

during  ight.



Locate the plywood wing dihedral brace.

Using a ruler, locate its centre and draw

a vertical line .

Dihedral brace

Draw centreline

Jumper 25

Instruction Man u al



Once the epoxy has cured, trial  t

both wing halves together. The cen tre

ribs should  t together  ush with no

gaps. If gaps do exist, use 220 grit

sandpaper and sand down the high

spots on the root ribs and the wing

joiner until a proper  t is achieved. The

correct amount of dihedral is ready-

built into the wings. With one wing half

laid  at on the table, the other wing

tip should be ap prox i mate ly 8cm off

the table surface. If this needs to be

adjusted, you may do so by sanding

small amounts from the cen tre ribs

or dihedral brace.



Carefully apply masking tape around

the top and bottom edge of the root

rib of each wing half to protect them

from damage caused by epoxy.



Mix a generous amount of 30 minute

epoxy. Coat the exposed half of the

dihedral brace, and the remaining

wing joiner box and both root ribs

with epoxy. Slide the two wing halves

to geth er and carefully align them at

the leading and trailing edges. Wipe

away any excess epoxy using paper

tow els. Use mask ing tape wrapped

around the centre section to hold

the halves in place until the epoxy

cures.

PARTS REQUIRED

SERVO INSTALLATION

INSTALLING THE AILERON SERVO MOUNT



{1}

Plywood Aileron Servo Mount



Install the rubber grommets and brass

collets onto the aileron servo. Test  t the ser vo

into the ai le ron servo mount.

Because the size of servos differ, you

may need to adjust the size of the precut

opening in the mount. The notch in the

sides of the mount allow the servo lead to

pass through.



Remove the aileron servo. Place the

mount onto the wing, aligning the cutout in the

mount with the cutout in the wing. The two

notches in the mount should face the leading

edge of the wing.



While holding the servo mount  rmly

in place, trace around it using a pen.



Remove the mount, and using a

mod el ing knife, carefully remove the covering

from inside the outline you drew.



Using Kwik Bond 5 Minute Epoxy,

glue the servo mount into place. Remove

any ex cess epoxy using a paper towel and

rubbing alcohol. Use pieces of masking tape

to hold the tray in place until the ep oxy fully

cures.

Servo tray



When the epoxy has cured, care ful ly

remove the masking tape from the

wing.



Peel off the backing from the self ad-

he sive covering strip. Apply the strip to

the centre section of the wing starting

from the bottom trailing edge. Wrap

the strip all the way around the wing

until it meets the trailing edge again.

Trim off any excess strip.

Dihedral brace

Root Rib

Epoxy attach

Jumper 25

Instruction Man u al

INSTALLING THE AILERON SERVO



Install the aileron servo into the servo

mount, with the output shaft towards the

lead ing edge of the wing, using the wood

screws pro vid ed with your ra dio sys tem. Drill

1/16” pi lot holes through the mount

PARTS REQUIRED

AILERON LINKAGE

INSTALLING THE AILERON LINKAGE

{2}

2mm x 170mm Threaded Wires

{2}

Nylon Adjustable Control Horns

{2}

Nylon Clevises

{2}

Adjustable Servo Connector Assemblies



Thread one nylon adjustable control

horn onto each aileron torque rod. Thread the

horns on un til they are  ush with the ends of

the torque rods.



Thread one nylon clevis at least 5/16”

onto each of the two 2mm x 170mm thread ed

wires.



Slide the pushrod wires following

pic ture bellow.

be fore in stall ing the screws. This will pre vent

the wood from splitting.



With both the aileron servo and the

ai le rons centered.



With the aileron servo cen tered, in stall

the servo arm onto the ser vo. The arm should

be in stalled so it is parallel with the trailing

edge of the wing.

Connector

Pushrod

wire

PARTS REQUIRED

LANDING GEAR INSTALLATION

{2}

Prebent Main Gear Wires

{2}

60mm Diameter Wheels

{4}

Nylon Landing Gear Straps

{

3mm x 12mm Wood Screws

{4}

Wheel Collars w/3mm x 6mm Set

Screws

Jumper 25

Instruction Man u al



Using a modeling knife, remove

the cov er ing from over the two main gear

mount ing slots lo cat ed in the bottom of the

fu se lage.



Insert the 90º bend of one main gear

wire into the predrilled hole in one mounting

slot.



The land ing gear wire is held in place

us ing two nylon landing gear straps and four

3mm x 12mm wood screws.

The straps should be lo cat ed equal dis tance

from the inside and outside ends of the wire.



Using the two landing gear straps as

a guide, mark the locations of the four 3mm

x 12mm mount ing screws onto the fuselage

sur face.



Remove the two straps and the gear

wire. Drill four 3/32” pilot holes into the wing

for the wood screws.

INSTALLING THE MAIN GEAR WHEELS



Slide one wheel collar with 3mm x

6mm set screw onto each axle. Push the

wheel collars on as far as they will go and

tight en the set screws.

Be careful not to overtighten the set

screws. Over tight en ing may cause the

threads to strip.

INSTALLING THE MAIN GEAR WIRES

Jumper 25

Instruction Man u al



Slide one 60mm di am e ter wheel onto

each axle and push them up against the wheel

collars. Slide the remaining wheel collars with

3mm x 6mm set screws onto the axles. Push

them up against the wheels and tight en the set

screws. The wheels should spin free and not

bind in any way. If they do bind, loos en the

set screws in the outer wheel collars and move

the collars out a small amount. Re tight en the

set screws.

NOSE GEAR INSTALLATION

PARTS REQUIRED

{1}

Nose gear.

{1}

Steering arm.

{1}

Connector.

{1}

Wheel.

TOOLS REQUIRED

Installing steering arm as follow.

Adjust the nose gear steering arm until the

arm is parallel with the  re wall.

Slide one 60mm di am e ter wheel onto each

axle and push them up against the wheel

col lars. Slide the remaining wheel collars with

3mm x 6mm set screws onto the axles. Push

them up against the wheels and tight en the set

screws. The wheels should spin free and not

bind in any way. If they do bind, loos en the

set screws in the outer wheel collars and move

the collars out a small amount. Re tight en the

set screws.

INSTALLING THE MAIN GEAR WHEELS

Pushrod wire

Jumper 25

Instruction Man u al

PARTS REQUIRED

FUEL TANK



{1}

Molded Nylon Fuel Tank



{1}

Preassembled Stopper Assembly



{1}

Metal Weighted Pick-Up



{1}

Molded Foam Fuel Tank Support



{1}

dowell

INSTALLING THE STOPPER ASSEMBLY



Using a mod el ing knife, carefully cut off

the rear portion of

one

of the two nylon tubes

leav ing 1/2” pro trud ing from the rear of the

stopper. This will be the fuel pick up tube.



Using a modeling knife, cut one length

of sil i con fuel line (not included) to 2-1/4” long.

Connect one end of the line to the weighted

fuel pickup and the other end to the nylon

pick up tube.



Carefully bend the second nylon

tube up at a 45º an gle. This tube is the vent

Weighted

Pick up

Fuel line

Bend tube

Vent tube

Fuel Pickup Tube

When the stop per as sem bly is installed in the

tank, the top of the vent tube should rest just

below the top surface of the tank. It should

not touch the top of the tank.



Test  t the stopper assembly into the

tank. It may be necessary to remove some

of the  ash ing around the tank opening using

a modeling knife. If  ashing is present, make

sure none falls into the tank.



With the stopper assembly in place, the

weight ed pickup should rest about 3/8” away

from the rear of the tank and move free ly in side

the tank. The top of the vent tube should rest

just below the top of the tank. It should not

touch the top of the tank.



When satisfied with the alignment

of the stop per assembly tighten the 3mm x

20mm ma chine screw until the rubber stop per

ex pands and seals the tank opening. Do not

over tight en the as sem bly as this could cause

the tank to split.

Top of Tank

Vent tube

Fuel Pickup Tube

silicon tubing not in-

clued

Jumper 25

Instruction Man u al

INSTALLING THE FUEL TANK

TOOLS REQUIRED

Pushrod wire



Using a modeling knife, cut one lengths

of fuel line 20” long. Connect one line to the

vent tube and one line to the fuel pick up tube

on the stopper. See picture bel low.



Feed both lines through the fuel tank

com part ment and through the predrilled hole

in the  re wall. Pull the lines out from be hind

the en gine, while guid ing the fuel tank into

place. Push the fuel tank until the front of the

tank touches the  rewall.

Blow through one of the lines to ensure

the fuel lines have not become kinked

in side the fuel tank com part ment. Air should

 ow through easily.

silicon tubing not inclued

Fuel tank attachment

Pushrod wire

Jumper 25

Instruction Man u al

MOUNTING THE ENGINE

PARTS REQUIRED



1) Locate the second 500mm plain wire

pushrod and second 400mm nylon pushrod

housing. Install the pushrod housing through

the predrilled hole in the  rewall and into the

servo compartment. The pushrod housing

should protrude 1/4" out past the front of the

 rewall. Make a Z-Bend 1/4" from one end of

the plain wire pushrod.



2) Screw 4 pilot horns 2.5 mm diameter on

engine mount as follow.



3) Temporarily bolt the plates to the motor

mount, but do not completely tight en them

down at this time. Leave them slightly loose

so they can be moved if needed.



9) Attach the Z-Bend in the pushrod wire

to the throttle arm on the carburetor. You

will need to remove the throttle arm from the

car- buretor to be able to attach the Z-bend.

When complete, reattach the throttle arm to

the car- buretor.



10) Locate the fuel tank assembly you built

earlier. Connect two lengths of fuel line (not

in- cluded) to the tubes coming out of the tank.

Keep track which one is for the fuel pick-up

and which one is for the muf er pressure.



11) Run the tubes throught the hole in the

 rewall and slide the tank assembly into place.

The stopper of the tank should rest in the pre-

drilled hole in the  rewall.



12) Use pieces off foam rubber to hold the

tank in place. Be careful the tank or the foam

doesn’t interfere with the pushrods.

Pusrod wire

Pen

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