1/4 Scale Sopwith Pup

Type                                        British Built ¼ Scale WW-I Biplane fighter

Wing Span                              77 Inches (14-3/4” cord) Both wings the same

Wing Area                              1985 Square Inches total.

Airfoil                                     Flat Bottom

Wing Loading                         14~17 Oz. / Sq. Foot

Fuselage Length                      53 Inches.

Flying Weight                         12 to 14 Pounds

Engine Size                             Gasoline 20 ~ 25cc / 1.20 ~ 1.50 4-stroke glow

Prop Size                                 Depends on engine being used

Fuel Tank                                16~24 Oz. (compatible with fuel requirements of engine)

Radio Equipment                    4-Channel W/ 5 servos min.

Servo Requirements               High torque 60~70 In. / Oz. servos

Wheel Size                              6-5/8 vintage (Not included in kit)

Cowl Diameter                       9” X 5”

Scale prop                               24-1/2 ~ 25” Dia.

Model Features

Balsa, Bass, and Ply construction

Two removable “1-piece” bolt on wings

Kit Includes

Full-Size plans W/ photo instruction book.

Jig & die cut parts

Pre-bent wire landing gear and struts W/ hardwood fairings

Basic hardware package

ABS plastic cowl.

Items Needed to Complete

Control system (push rod type or pull / pull cable system suitable for a model of this size)

Fuel System (fuel tank & fuel lines) compatible with the fuel requirements of engine being used.  Covering (2) 5-meter rolls required.  1-pair 6-5/8 Vintage wheels

Regular Stocked Parts & Options

Part Number             Description   

D420                           Decal Set        

A420                           Plans & Instructions    

488                              7” Vintage wheels (1-pair)

G902                           1/4 Scale Vickers Gun  (2 req.)

428                              Gold-N-Rod 36”    (one pack required)

430                              Gold-N-Cable 36”  (one pack required)

678                              16 Oz. Fuel Tank  (For Glow Fuel use ONLY)

Notes

Center of Gravity                  4 Inches back from leading edge of TOP wing. 

Control Throws:                                                             Incidence:

Elevator …...…… 1-1/2~2” Up and Down              Top Wing  ….…....… +1~2 Degrees

Rudder ……..…  3/4~1” Left and Right            Bottom Wing  …...  -1~0.0 Degrees

Ailerons ……….. 3/4 ~ 1” Up and Down              Tail  …………… …...  0.0 Degrees

(Aileron differential recommended 1" Up 3/8” Down)          

Thrust Line ..  2 Degrees DOWN,  1Degree RIGHT

1/4 Scale Sopwith Pup Decals “British”:

4          Large Roundels           Top and bottom of the wings …………………….… 12 Inch

2          Small Roundels            Fuselage sides ……………………………………..... 6 Inch

2          Number “4”s               Fuselage sides ………………………………..…. 4-1/8 Inch

2          “Sopwith Aviation Co”                      Vertical fin.