Seagull Models Mitchell B-25 Manual de usuario

Specications:

Wingspan--------------- 95.0 in (241.2 cm).

Wing area--------------- 1191.0 sq.ins (76.8 sq.dm).

Weight------------------- 24.2 lbs (11.0 kg).

Length------------------- 75.7 in (192.3 cm).

Engine/Motor size----- 20cc gasoline engine.

Radio--------------------- 11 channels with 14 servos.

SEA 330 : Without electric retracts landing gear.

SEA330gear: including Electric retracts landing gear.

ASSEMBLY MANUAL

Code : SEA 330

Mitchell B-25 -for 20cc engines-95” Instruction Manual.

INTRODUCTION

WARNING

KIT CONTENTS

ank you for choosing the Mitchell B-25 -for 20cc engines-95” ARTF by SG MOD-

ELS .e Mitchell B-25 -for 20cc engines-95” was designed with the intermediate/advanced

sport yer in mind. It is a semi scale airplane which is easy to y and quick to assem-

ble. e airframe is conventionally built using balsa, plywood 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. e motor mount has been tted and

the hinges are pre-installed. Flying the Mitchell B-25 -for 20cc engines-95” is simply a joy.

is instruction manual is designed to help you build a great ying aeroplane. Please read

this manual throughly before starting assembly of your Mitchell B-25 -for 20cc engines-95” Use

the parts listing below to indentify all parts.

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 oer a

variety of training procedures designed to help the new pilot on his way to successful R/C

ight. ey will also be able to advise on any insurance and safety regulations that may ap-

ply.

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 & REPONSIBILITY.

2 2

3 3

KIT CONTENTS

SEA330 Mitchell B-25 -for 20cc engines-95”

1. Fuselage

2. Wing set (2)

3. Tail set (2)

4. Canopy

5. Cowling (2)

6. landing gear

7. Pilot

8. Fuel tank

9. Aluminum wing tube

10. Ep Motor box

ADDITIONAL ITEMS REQUIRED

TOOLS & SUPPLIES NEEDED

in cyanoacrylate glue.

Medium 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.

read-lock.

Paper towels.

�20cc gasoline engine.

�Computer radio 11 channel with

14 servos.

�Glow plug to suit engine.

�Propeller to suit engine.

�Protective foam rubber for radio

system.

HINGING THE AILERON

Note : e control surfaces, including the ai-

lerons, elevators, and rudder, are prehinged

with hinges installed, but the hinges are not

glued in place. It is imperative that you prop-

erly adhere the hinges in place per the steps

that follow using a high-quality thin C/A glue.

Carefully remove the aileron from one of

the wing panels. Note the position of the

hinges.

Remove each hinge from the wing panel

and aileron and place a T-pin in the center

of each hinge. Slide each hinge into the wing

panel until the T-pin is snug against the wing

panel. is will help ensure an equal amount

of hinge is on either side of the hinge line

when the aileron is mounted to the aileron.

T-pin

Slide the wing panel on the aileron until

there is only a slight gap. e hinge is now

centered on the wing panel and aileron. Re-

move the T-pins and snug the aileron against

the wing panel. A gap of 1/64” or less should

be maintained between the wing panel and

aileron.

Hinge

Mitchell B-25 -for 20cc engines-95” Instruction Manual.

NOTE : e hinge is constructed of a spe-

cial material that allows the C/A to wick

or penetrate and distribute throughout

the hinge, securely bonding it to the wood

structure of the wing panel and aileron.

Deect the aileron and completely saturate

each hinge with thin C/A glue. e ailerons

front surface should lightly contact the wing

during this procedure. Ideally, when the

hinges are glued in place, a 1/64” gap or less

will be maintained throughout the lengh of

the aileron to the wing panel hinge line.

Turn the wing panel over and deect the

aileron in the opposite direction from the

opposite side. Apply thin C/A glue to each

hinge, making sure that the C/A penetrates

into both the aileron and wing panel.

Using C/A remover/debonder and a paper

towel, remove any excess C/A glue that may

have accumulated on the wing or in the

aileron hinge area.

Repeat this process with the other wing

panel, securely hinging the aileron in place.

Aer both ailerons are securely hinged,

rmly grasp the wing panel and aileron to

make sure the hinges are securely glued and

cannot be pulled out. Do this by carefully ap-

plying medium pressure, trying to separate

the aileron from the wing panel. Use caution

not to crush the wing structure.

Work the aileron up and down sev-

eral times to “work in” the hinges

and check for proper movement.

Note :

Hinge

CA glue

WING TIP BULBS

Please see below pictures.

ey are designed to operate on volt-

ages 12 volts.

CA glue

Mitchell B-25 -for 20cc engines-95” Instruction Manual.

INSTALL THE AILERONS

CONTROL HORN

Fiberglass control horn

Epoxy

Fiberglass control horn

Epoxy

Install the ap control horn using the

same method as same as the aileron con-

trol horns.

INSTALL FLAP CONTROL HORN

1.4.

INSTALLING THE ALLERON SERVOS

Because the size of servos dier,

you may need to adjust the size of the

precut opening in the mount. e notch

in the sides of the mount allow the servo

lead to pass through.

Place the servo between the mounting

blocks and space it from the hatch. Use a

pencil to mark the mounting hole loca-

tions on the blocks.

Use drill bit in a pin vise to drill the

mouting holes in the blocks.

Apply 2-3 drops of thin C/A to each

of the mounting holes. Allow the C/A to

cure without using accelerator.

Use dental oss to secure the connec-

tion so they cannot become unplugged.

Secure the servo to the aileron hatch

using Phillips screwdriver and the screws

provided with the servo.

C/A glue

Minimum servo spec.

Torque : 194 oz-in (14 kg-cm) @ 6.0V;

236 oz-in ( 17kg-cm) @ 7.4V

Mitchell B-25 -for 20cc engines-95” Instruction Manual.

Apply 1-2 drops of thin C/A to each

of the mounting tabs. Allow the C/A to

cure without using accelerator.

Remove the string from the wing at the

servo location and use the tape to attach

it to the servo extension lead. Pull the

lead through the wing and remove the

string.

Set the aileron hatch in place and use a

Phillips screw driver to install it with four

wood screws.

3x10mm

11.

12.

13.

14.

10.

C/A glue

AILERON PUSHROD INSTALLATION

Please see below pictures.

INSTALLING THE FLAP SERVO

Repeat the procedure for the ap servo.

INSTALLING THE FLAP PUSHROD

Repeat the procedure for the aileron

pushrod.

15.1.

80mm

Mitchell B-25 -for 20cc engines-95” Instruction Manual.

SET UP BOTTOM HATCH SYSTEM

Please see below pictures.

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