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SIG Four-Star 20EP - User Manual

SIG Four-Star 20EP
26 pages
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Sig Mfg. Co., Inc...401
-
7 South Front Street...PO Box 520....Montezuma, IA 50171
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0520
Congratulations on your purchase of the SIG FOUR-STAR 20EP. For many years the SIG Four-Star series of low-wing sport
airplanes have proven to be among the most popular and versatile at the flying field. Originally designed for 2-stroke glow
engines, Four-Stars have also excelled with 4-stroke, gasoline, and now electric motors. The secret to their popularity is their
light flying weight and low wing loading, combined with excellent aerobatic performance. The maneuverability and smooth
handling of the Four-Star will make it the sport model you'll want to take to the flying field every time.
The FOUR-STAR 20EP is the first Four-Star kit designed primarily for electric power (although the structure is configured to
easily accommodate a glow engine if you wish to go that way). This use of a modern electric power system in the legendary
Four-Star has produced a marvelous little R/C ship that is a pure joy to fly. It's small enough to carry around in your vehicle
completely assembled and ready to fly almost anywhere, anytime!
Assembly of the FOUR
-STAR 20EP is quick and easy, following the detailed instructions in this manual. All parts are CAD-
drawn and the majority are laser-cut, so that everything fits the way it should! We strongly suggest that you read through the
manual first to get familiar with the various parts and the assembly sequences.
Question and Answer IconNeed help?

Do you have a question about the SIG Four-Star 20EP and is the answer not in the manual?

Summary

Additional Items Needed

Brushless Outrunner Electric Motor

Specifies requirements for the electric motor, including wattage and kv rating.

Electronic Speed Control (ESC)

Details the necessary electronic speed controller, emphasizing matching it to the motor.

Lithium-Polymer Battery Pack

Recommends a specific type and capacity range for the LiPo battery pack.

Battery Charger

Stresses the importance of using a proper charger designed for LiPo batteries.

Spinner

Suggests an optional spinner size and alternative prop nut.

Main Wheels

Specifies the required diameter for the main landing gear wheels.

4-Channel Radio Control System

Outlines the requirement for a radio system and specific servo types for optimal performance.

Servo Chords

Lists the necessary servo extension and Y-harness cables for connecting servos.

Covering Material

Recommends iron-on plastic covering material and notes quantity needed.

Glues

Various types of glues are recommended for model assembly, including CA and epoxy.

Basic Modeling Tools

Power Drill and Bits

Lists required drill bits for various assembly tasks.

Soldering Tools

Specifies the need for a soldering iron and solder.

Covering Tools

Recommends tools for applying and sealing covering material.

Wood Finishing Tools

Lists essential tools for shaping and preparing wood components.

Sanding Supplies

Details sandpaper grits and block construction for surface preparation.

Glow Power Option

Checklist of Changes for Glow Engine

Details modifications needed to adapt the model for a glow engine instead of electric power.

Notes Before Beginning Construction

Wing Panel Construction

Left Wing Panel Assembly

Detailed steps for building one wing panel, including spar, ribs, and sheeting.

Joining The Wing Panels

Instructions for joining the two wing panels together using a dihedral brace.

Tail Surfaces

Stabilizer and Elevator Assembly

Guide for assembling the horizontal stabilizer and elevator control surfaces.

Fin and Rudder Assembly

Steps for constructing the vertical stabilizer (fin) and rudder.

Elevator;Stabilizer Tip Alignment

Procedure for aligning and preparing the elevator and stabilizer tips.

Fuselage Construction

Fuselage Sides and Formers

Laminating and preparing fuselage sides and front formers for assembly.

Attaching Fuselage Sides

Gluing the fuselage sides to the formers and top, incorporating key components.

Covering

Surface Preparation for Covering

Instructions on sanding and filling the model surfaces before applying covering material.

Covering The Wing

Method for applying covering material to the wing panels and wingtips.

Covering The Fuselage

Step-by-step guide for covering the main fuselage sections and hatch.

Covering The Tail Surfaces and Ailerons

Procedure for covering the stabilizer, elevators, fin, rudder, and ailerons.

Decal Application

Hinging The Control Surfaces

Hinging Elevators to Stabilizer

Detailed process for cutting slots and hinging the elevators to the stabilizer.

Hinging Ailerons to Wing

Instructions for hinging the ailerons to the wing panels using thin CA glue.

Hinging Rudder and Fin

Procedure for hinging the rudder to the fin, noting timing and glue application.

Final Assembly

Wing Installation on Fuselage

Attaching the assembled wing to the fuselage, ensuring proper alignment.

Stabilizer Installation

Mounting and gluing the stabilizer to the fuselage, checking alignment with the wing.

Fin Installation

Attaching the vertical fin to the stabilizer and fuselage, ensuring squareness.

Tailwheel Assembly and Installation

Steps for assembling and mounting the tailwheel to the fuselage.

Main Landing Gear Installation

Mounting the main landing gear assembly to the bottom of the fuselage.

Canopy Installation

Fitting and attaching the plastic canopy to the fuselage.

Radio Installation

Control Horn Mounting

Attaching nylon control horns to the elevator and rudder control surfaces.

Elevator Pushrod Setup

Assembling and installing the pushrod system for the elevator control.

Rudder Pushrod Setup

Creating and installing the pushrod for the rudder control surface.

Aileron Pushrod Setup

Installing the pushrods for the aileron control surfaces, including servo connection.

Motor Installation

Motor Mounting and Spacing

Guidelines for mounting the electric motor and ensuring correct shaft alignment and spacing.

Cowling Mounting

Fitting and securing the engine cowling to the fuselage for aerodynamics and cooling.

System Tests

Initial Power-Up and Transmitter Check

Testing the radio system and motor for proper function and neutral positions.

Elevator and Rudder Servo Checks

Verifying correct movement and centering of elevator and rudder servos.

Aileron Servo Checks

Checking the direction and centering of the aileron servos for proper control.

Control Throws

Balance Your Airplane

First Test Flight

Join The Club

Customer Service

SIG Four-Star 20EP Specifications

General IconGeneral
Wingspan60 in (1524 mm)
Weight5-6 lb (2268-2722 g)
Wing Loading21–23 oz/sq ft (64–70 g/sq dm)
ControlAileron, Elevator, Rudder, Throttle
MaterialBalsa

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