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Focke Wulf<br />

FW-44 Stieglitz<br />

1932<br />

Assembly and finishing <strong>Manual</strong><br />

for ARF stand-off scale model<br />

in 1:5 scale.<br />

Historical data and presentation.<br />

Model design and construction drawing by<br />

Göran Kalderén ©<br />

Rev. 2000-05-25


Swedish Airforce aircraft No 670, type FW44J, was built by Focke Wuld Flugzeugbau GmbH<br />

in Germany. These pictures were taken in August 1976 at Malmen by Linköping, Sweden, show all<br />

relevant details. This year the Swedish Airforce celebrated its 50th year anniversary. The aircraft<br />

was transferred from Wing No 3 to wing No 5 shortly thereafter.<br />

Focke Wulf FW 44 ARF 2


Focke Wulf FW44J, here at the F3 wing<br />

airfield, Malmslätt near Linköping, Sweden,<br />

preserved by the Swedish Airforce Museum.<br />

This aircraft is still in good flying condition and<br />

has been flown at air shows during recent years.<br />

This aircraft is one of several survivors in<br />

Sweden. The cockpit photos reveal that only the<br />

rear cockpit has full instrumentation. This was<br />

not common but may be a result of the aircraft<br />

serving as glider tow airplane, until handed over<br />

to the museum.<br />

Focke Wulf FW 44 ARF 3


Specifications:<br />

Type: Focke Wulf Fw 44J:<br />

Function: Sports trainer<br />

Crew: 2<br />

Engine: One Siemens Bramo Sh 14a<br />

Wingspan: 9.01m<br />

Length: 7.29m<br />

Height: 2.83m<br />

Wing area:<br />

20sqm<br />

Focke Wulf FW 44 ARF 4<br />

Weight: Empty:<br />

Loaded weight:<br />

Maximum speed:<br />

Cruising:<br />

Service ceiling:<br />

Maximum range:<br />

525kg<br />

770kg for aerobatics<br />

870kg for training<br />

900kg for touring<br />

115 mph<br />

107 mph<br />

12792 ft<br />

420 miles


Right top: Siemens Bramo Sh-14, 7 cylinder radial<br />

aircooled engine, 150 hp.<br />

Left top: Original lubrication chart for landinggear.<br />

This chart gives a clear view of the landingear<br />

design.<br />

Left center: Original lubrication chart for airframe<br />

controls.<br />

Below: FW44c as trainer in the German Airforce<br />

in 1939 -1945 with grey camouflage paint and<br />

contemporary unit markings.<br />

Focke Wulf FW 44 ARF 5


Focke Wulf FW-44 Stieglitz<br />

When Kurt Tank joined the Focke Wulf<br />

Flugzeugbau GmbH as technichal chief, his first<br />

design to take to the air in 1932 was the Fokke<br />

Wulf FW-44 Stieglitz (Goldfinch). It was designed<br />

to meet the requirements of a number of<br />

German expert aerobatic pilots like Gerd<br />

Achgelis, Emil Kropf and Ernst Udet. It proved<br />

to be an excellent aircraft fully capable of the<br />

aerobatic maneuvres performed by these pilots.<br />

The first prototype was equipped with an 150 hp<br />

Bramo Siemens Sh-14a radial engine.<br />

A large number of Stieglitz were sold and<br />

delivered to countries like Bolivia, Bulgaria, Chile,<br />

China, Finland, Hungary, Sweden, Rumania,<br />

Turkey and Slovakia.<br />

Demand could not be met within the factory<br />

and several aircraft were built under licence in<br />

Sweden, Argentinia, Turkey and Brazil.<br />

Work began on the Fw 44 in 1931 shortly after<br />

the amalgamisation of Focke-Wulf wit Albatros-<br />

Flugzeugwerke and was the first complete aircraft<br />

designed at Focke-Wulf under the guidance<br />

of Kurt Tank. It was designed as a two-seat biplane<br />

for sporting and primary training use. The<br />

Fw 44 was instrumental in establishing Focke-<br />

Wulf Flugzeugbau when substantial orders were<br />

received for the plane.<br />

The plane first flew in late summer 1932 powered<br />

by a seven cylinder air-cooled radial engine,<br />

the Bramo Siemens Sh 14a, but displayed<br />

many faults. Considerable test flying by Kurt<br />

Tank lead to much redesign, The Fw 44<br />

emerged as an aircraft with excellent flight characteristics<br />

and strength.<br />

The Fw 44’s reputation was much enhanced<br />

by its use as an aerobatic display aircraft by the<br />

top german pilots of the day.<br />

The Fw 44C, the main production model,<br />

was a strut and wire braced biplane, the wings<br />

having equal span and slight sweepback, stagger<br />

and dihedral. The lower wings were attached<br />

to the bottom of the fuselage, the upper by struts.<br />

The wings were of wood and fabric. The fuselage<br />

was of welded steel construction covered<br />

by metal panels as far back as the cockpit and<br />

the remainder by fabric.<br />

Our model is based on one of the remaining aircraft,<br />

the Focke Wulf FW44 J, now on display in<br />

the Swedish Airforce Museum in Linköping, Sweden.<br />

Restored FW 44 j flying in California, USA.<br />

Markings from 1937 - 1940 period of the<br />

Swedish Airforce.<br />

Present restored FW 44 c in Germany (note the<br />

tail wheel, necessary for hard surface runways)<br />

and below our model of the A/C to the right.<br />

Focke Wulf FW 44 ARF 6<br />

Proud student pilot in front of his aircraft


German Airforce paint scheme in<br />

the early part of WW2<br />

The Model<br />

We have chosen the scale of 1:5 rendering<br />

a model size that i easy to fly but also<br />

relatively easy to transport. Both the upper and<br />

the lower wing panels can be removed for<br />

transportation which gives very limited<br />

requirement for transportation size. We<br />

recommend a .90 4-stroke or a .75 2-stroke<br />

engine. The 4 stroke engine fits in upright position<br />

and blends very nicely with the dummy engine<br />

cylindres. This aircraft was designed for<br />

aerobatics of the time and can be flown through<br />

advanced manouevres. At the same time it was<br />

a trainer and the low speed behaviour is rather<br />

docile and allows for the pilot to think...<br />

This model has all control surfaces<br />

connected in scale fashion. The ailerons are<br />

actuated via connecting rods to bellcranks in the<br />

lower wings, which i turn are connected with<br />

wires via pulleys to the ailerons in the lower<br />

wings. The upper ailerons are connected with<br />

dual wires from the lower ailerons in scale<br />

fashion. The elevator is actuated via pull-pull<br />

cables from the control column. The rudder in<br />

turn has conventional pull-pull cables to the<br />

rudder bar.<br />

The finished model is painted in 1940<br />

Swedish Airforce livery and further detailing can<br />

be made as per documentation. This model can<br />

also be supplied in various German liveries.<br />

Model specification<br />

Wingspan: 72" (180 cm),<br />

Length: 58.4" (146 cm),<br />

Wing area: 1138 sq inch (80 dm²)<br />

Weight: 11 lbs 5 oz. (5400 g)<br />

Wing Load: 23.5 oz/sq' (70 g/dm²)<br />

Engine: .60-.75 cc (10-12.5cc) 2-<br />

stroke, .80 - .90 4 stroke<br />

Covering and finish<br />

The model is covered and painted from the<br />

factory. If you are going to use a glowplug or<br />

gasoline engine for flying, you must coat the<br />

interior of the engine compartment with a fuel<br />

proof paint.<br />

Installation of engine and radio<br />

We recommend that you don't overpower<br />

this model. It will fly happily with a .60 - .75 standard<br />

2-stroke engine. No side or down thrust is<br />

deemed necessary but can easily be<br />

incorporated at this time. Details on page 8-9.<br />

Assembly of the Focke Wulf FW44<br />

All parts have been assembled at the<br />

factory and only disassembled for transportation.<br />

Rudder and elevator and aileron wires are<br />

factory adjusted but may need some tensioning<br />

adjustment after a while. Aileron bellcranks are<br />

adjustable to the connecting rod.<br />

Assembly of the tail unit<br />

1. Attach horizontal tail to fuselage using<br />

4 pcs 4 mm nylon countersunk screws. Make<br />

sure that stabilizeris flat against fuselage.<br />

2. Insert fin with vertical spar into<br />

fuselage. Attach fin using 2 pcs 4 mm nylon<br />

countersunk screws. Make sure that fin is<br />

perpendicular to stabilizer.<br />

3. Attach the fin supports with a 2mm<br />

screw and nut in the fin and #2 x 1/4" sheet metal<br />

screws in the stabilizer.<br />

4. Attach the stabilizer support struts to<br />

the fuselage using # 2 x 1/4" screws.<br />

5. Attach the rudder with the hinge pins<br />

and connect the rudder wires to the rudder horn<br />

and the elevator wires to the elevator horns.<br />

Check the action of elevator and rudder.<br />

Continued on page 10 ><br />

Focke Wulf FW 44 ARF 7


Cut out in<br />

top panel<br />

Throttle needle<br />

Fuel<br />

filing<br />

tube<br />

Radio switch on<br />

forward cockpit<br />

instrument panel<br />

Landing gear secured<br />

with 3 mm bolts and<br />

lock nuts<br />

Dummy<br />

exhaust tube may be left<br />

for appearance<br />

Throttle<br />

linkage<br />

and fuel<br />

tubings<br />

Header<br />

Installation of engine, tank and radio<br />

We installed an OS .90 4-stroke<br />

surpass engine and used a flexible header<br />

to lead the exhaust under the fuselage in a<br />

near scale fashion. We also used a 12 Oz.<br />

tank.<br />

1. Remove the dummy engine by<br />

loosening the two screws in the front collector<br />

ring and remove the 2 2 mm screws<br />

and nuts that holds the exhaust tube.<br />

2. Drill the holes in the engine mount<br />

and install 4 6-32 blind nuts for the engine<br />

bolts.<br />

3. Cut out for the engine in the top<br />

cover panel. and drill the hole for the header<br />

in the engine mounting board and in the bottom<br />

cover.<br />

Focke Wulf FW 44 ARF 8<br />

Header exit in<br />

line with dummy silencer<br />

One dummy cylinder is<br />

removed


Rudder and elevator servo<br />

in forward tray<br />

Twin coupled aileron servos in<br />

rearward tray<br />

Tank in the upper tray<br />

center, throttle servo<br />

to the right<br />

Header is<br />

routed to<br />

bottom<br />

aluminum<br />

panel and exits<br />

in line with<br />

dummy<br />

exhaust<br />

Receiver and<br />

battery pack<br />

to the left, secured<br />

with<br />

rubber<br />

bands<br />

4. Remove one cylinder<br />

from the top of the dummy engine<br />

and adjust the cutout in the “crankcase”.<br />

Replace the dummy engine<br />

and check for fit. The OS .90 blends<br />

nicely with the dummy. Cut out and<br />

adjust the rear portion of the exhaust<br />

tube and bend the header<br />

tube to suit the outline. Attach the<br />

header tube with a clamp to the<br />

dummy silencer.<br />

5. Install the throttle servo<br />

in the top compartment and connect<br />

to the throttle lever.<br />

6. Install the tank with silicone<br />

tube connections.<br />

7. Install the aileron, rudder<br />

and elevator servos in the respective<br />

servo trays. Not that the two<br />

aileron servos are interconnected.<br />

8. Place the receiver and<br />

the battery pack along the tank. The<br />

switch can be mounted on the from<br />

cockpit instrument panel.<br />

9. Connect the aileron servos<br />

with ball links or clevices to the<br />

aileron push rods.<br />

10. The same applies to the<br />

rudder and elevator servos connection<br />

to the rudder bar and the control<br />

column.<br />

Check for correct throws on the<br />

control surfaces. The elevator and<br />

ailerons should deflect 20°, the rudder<br />

almost 30°.<br />

Focke Wulf FW 44 ARF 9


The wood and metal construction of the model<br />

Built up<br />

dummy<br />

engine<br />

Functional<br />

scale aileron<br />

control<br />

system<br />

Dummy engine is<br />

built from wood and<br />

metal. Aileron control<br />

is by wire per<br />

prototype. Rudder /<br />

elevator control by<br />

wire to control<br />

column and rudder<br />

bar. Spung tailskid in<br />

scale fashion.<br />

Focke Wulf FW 44 ARF 10


Landing gear has scale oleo, rubber<br />

dampened, spring action as the full size<br />

aircraft. Right hand side aluminum<br />

panel removed.<br />

The elevator is actuated with the joy-stick and<br />

the rudder with the rudder bar.<br />

Assembly of wing panels<br />

1. Push the lower wing halves into the holes<br />

in the fuselage.<br />

2. Attach the upper wing using the 4 Allen<br />

6-32 screws supplied (note that the front screws<br />

are longer and the rear screws shorter). Connect<br />

the aileron bellcranks with push rods to the servo<br />

in the fuselage. Install the link wires between the<br />

lower and upper ailerons. Adjust length so that<br />

all ailerons are neutral. Check the movement of<br />

the ailerons. We recommend that you attach the<br />

aileron pushrods in a manner, acheiving<br />

differential throw of the aileron. Attach the flying<br />

wires in place. Attach the landing wires in place.<br />

3. Install the interplane struts. Secure with<br />

2 mm screws and 2 mm lock nuts. Note that the<br />

rear strut is adjustable at the attachment point<br />

in the lower wing. By turning the screw up or<br />

down you can adjust the wing outer section<br />

incidence and the wash out of the upper wing.<br />

Landing gear<br />

Install the landing gear by securing the legs<br />

with 3 mm screws and lock nuts. The centre<br />

point schould be attached to the landing gear<br />

support tripod with a 3 mm screw and lock nut.<br />

Install the wheels on the shaft and secure<br />

with the stoppers. This type of landing gear relies<br />

on the spring action of the rubber in the oleo<br />

mounting in the landing gear. This is a very<br />

efficient shock absorber. If worn out the rubber<br />

can easily be replaced with a fresh, longer one.<br />

Balancing<br />

The center of gravity / balancing point<br />

should be approx. approx. 13 cm (5.2")<br />

measured from the leading edge center of the<br />

upper wing. Placing the C/G up to ½" further<br />

forward makes the airplane steadier but limits<br />

the aerobatic capability. Make adjustments if<br />

necessary to suit your flying taste..<br />

Flying<br />

The prototype was flown with a OS .90<br />

4-stroke FS which provides ample thrust. Let the<br />

engine swing a 16x6 propeller if possible. This<br />

gives better thrust outside the big dummy engine<br />

and reduces sound to a more realistic level.<br />

Flying characteristics are very forgiving<br />

and will fly hapily on half trottle. Set the elevator<br />

at zero angle for the first flight but be prepared<br />

to give down elevator if the model climbs out too<br />

steep. During the initial take off run you have to<br />

compensate for the torque with right rudder but<br />

as the speed builds up the rudder is returned to<br />

neutrual. This model should fly of the ground and<br />

not be pulled.<br />

The landing approach can be rather<br />

steep as per prototype but the flare out needs<br />

almost full up elevator. Get the tail down to<br />

maintain directional stability. Remember this<br />

was the mount of many of the German aerobatic<br />

aces.<br />

Happy landings!<br />

Focke Wulf FW 44 ARF 11


What is in the box:<br />

The ARF kit contains the parts shown in the picture.<br />

All the parts are covered and painted. All the rigging<br />

wires are supplied in the correct lengths and need<br />

only to be clipped to their positions.<br />

16<br />

4<br />

9<br />

7<br />

12<br />

11<br />

14<br />

1<br />

13<br />

15<br />

4<br />

8<br />

5<br />

8<br />

2<br />

6<br />

10<br />

3<br />

1. Fuselage with wing cabane<br />

2. Landing gear with scale function<br />

3. Scale wheels<br />

4. Dummy engine with manifold<br />

5. Scale propeller<br />

6. Tail skid assy.<br />

7. Fin with rudder<br />

8. Stabilizer / elevator<br />

9. Upper wing panels<br />

10. Lower wing panels<br />

11. Interplane struts<br />

12. Aileron connecting wires<br />

13. Landing wires with turnbuckles<br />

14. Flying wires with turnbuckles<br />

15. Cabane cross-support wires<br />

16. Assembly manual with scale documentation<br />

K&W<br />

Model<br />

Airplanes Inc.<br />

Focke Wulf FW 44 ARF 12<br />

P.O.Box 1229, Cebu City Centrl. Postoffice<br />

Cebu City 6000, Philippines<br />

Visiting address:<br />

3343 Gun-Ob, Kinalumsan,<br />

Lapu-Lapu City 6015, PHILIPPINES<br />

Phone +63 32-340 7147, Cellular +63 917-3200 985<br />

Telefax +63 32-340 7131, E-mail: kwmairpl@gsilink.com<br />

Website http://www.gsilink.com/user/kwmairpl

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