SPECIFICATIONS

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Nardi FN-333 Prototype

 I-????
Protorype FN-333
Original Configuration

TECHNICAL DESCRIPTION


T
ype - Three Seat boat Amphibian.

Wings - Shoulder wing cantilever monoplane.  Two-spar all metal construction.  Centre-section, attached to hull, carries tail-booms and engine mounting.  Statically and aerodynamically balanced ailerons.  Split flaps inboard of ailerons.  Gross wing area 13.5 m (145.26 sq ft).

Hull - Single step all metal structure.  Hull below cabin floor has series of watertight compartments.  Deck of rear portion provided with manholes and drain openings.  Rudder hinged to sternpost.

Tail Booms - Each is tapered tube made from a single duralumin sheet.  Boltet to wing centre-section through flanged duralumin collars.

Tail Unit - Rectangular tailplane between ends of booms.  Statically and aerodynamically balanced elevator has central controllable trim-tab.  Aerodynamically balanced rudders.  Entire tail-unit is of metal construction.  Tailplane span (centre-line of booms) 2.50 m (8 ft 2 in).

Landing Gear - Retractable nose-wheel type.  Two main units are independent but are retracted by a single hydraulic jack.  When retracted, each unit is entirely buried in side of hull.  Oleo-pneumatic shock-struts-  Wheels are of peralumin anti-corrosive alloy and have Bendix-type hydraulic disc brakes.  Main wheel track 1.96 m (6 ft 5 in).  Wheelbase 2.65 m (8 ft 8 in).

Wing Tip Floats - Retractable floats are of peralumin alloy and are carried on single struts.  Hydraulic retraction.  When raised are located at wing tips.

Power Plant - One 145 hp Continental horizontally-opposed fan-cooled engine burried in centre-section.  Aeromatic automatically adjustable-pitch pusher propeller with armoured wood blades.  Electric starter.  One 100 litre (22 imp gallons) fuel tank in hull behind cabin.

Accommodation - Cabin seats three, two each side and backs of front seats hinged forward to give access to rear seat.  Radio.  Electric position indicators for landing gear, flaps and wing-tip floats.

 I-????
Prototype FN-333
Modified engine air intake

NARDI FN-333 3-view drawing

NARDI FN-333
3-view

SPECIFICATIONS


Dimensions

Span (over wing-tip floats) 10,0 m (32 ft 9 in)
Length of hull 5,55 m (18 ft)
Overall length 7,0 m (22 ft 11 in)
Height 2,66 m (8 ft 9 in)

ENGINE

Make Continental
Model O-???
Power 145 hp @ ? RPM

Weights and Loadings

Weight empty 584 kg (1,285 lbs)
Disposable load 306 kg (673 lbs)
Weight loaded 890 kg (1,958 lbs)
Wing loading 65,9 kg/m (13.51 lbs/sq ft)
Power loading 6,13 kg/hp (13.48 lbs/hp)

Performance

Max. speed 255 km/h (158 mph)
Cruising speed 230 km/h (143 mph)
Min. speed 77 km/h (47.8 mph)
Ceiling 5.400 m (17,710 ft)
Normal range 800 km (500 miles)

(JAWA 1953 - 54)

 I-KISS
Third Prototype FN-333
Rounded tail fins and main wheels folding into the wings

Nardi FN-333-S


The FN-333-S is the production development of the previously-described FN-333.  It is powered by a 225 hp Continental engine, has accommodation for four persons and is fitted with a novel form of wing-folding.

The wing of FN-333-S is in five sections, consisting of centre-section and four outer sections, two each side, the inboard sections being hinged to fold upward and the outboard sections downward.  The wing folding and unfolding, which is controlled form the cockpit by a system of hydraulic jacks, is automatically synchronized to ensure that, when the aircraft is afloat, the wing-tip floats are in constant contact with the water so as to maintain lateral stability.  There is an independent control for normal wing-tip float retraction and lowering.

There is no proof that Model FN-333-S ever was built, with folding wings.

SPECIFICATIONS (FN-333-S)


Dimensions

Same as for FN-333 plus:

Overall width folded 3,58 m (11 ft 9 in)

ENGINE

Make Continental
Model O-470-H
Power 225 hp @ 2600 RPM

Weights and Loadings

Weight empty 670 kg (1,474 lbs)
Disposable load 306 kg (673 lbs)
Weight loaded 976 kg (2,147 lbs)
Wing loading 72,5 kg/m (14.86 lbs/sq ft)
Power loading 4,35 kg/hp (9.57 lbs/hp)

Performance

Max. speed 290 km/h (180 mph)
Cruising speed 260 km/h (161 mph)
Min. speed 82 km/h (51 mph)
Ceiling 7.500 m (24,600 ft)
Normal range 650 km (405 miles)

(Jane's All The World's Aircraft 1953 - 54)

Nardi/FIAT FN-333 (Pre-production)


An un-known number of pre-production FN-333 were built by Nardi/FIAT. They had main wheels folding into the wings and Continental O-470H engine with carburetor. The production model had IO-470P engine with fuel injection and main wheels folding into aft fuselage sides.

Known pre-production FN-333 aircraft are: I-EUST, I-ELYO, I-RAID (I-RAIB), I-RAIE and I-RAIG. It seems that most pre-production were remanufactured with main wheels moved to fuselage sides and delivered as "production" models with IO-470-P engine.

 I-EUST
Pre-production FN-333
Instrument Panel

 I-EUST
Pre-production FN-333
Instrument Panel

 I-EUST
Pre-production FN-333
Main wheels folding into to the wings

 I-EUST
Pre-production FN-333
Landing light in nose

SPECIFICATIONS (PRE-PRODUCTION)


Dimensions

Wing span 10,36 m (34 ft 0 in)
Length 7,30 m (23 ft 11.5 in)
Height from ground 3,20 m (10 ft 6 in)
Main wheel track 1,88 m (6 ft 2 in)
Wing area 15,14 m (163 sq ft)
Luggage space 0,425 m (15 cub ft)

ENGINE

Make Continental
Model O-470-H
Power 225 hp @ 2600 RPM

Weights and Loadings

Weight empty 890 kg (1,962 lbs)
Useful load 460 kg (1014 lbs)
Gross weight 1.349 kg (2,975 lbs)
Wing loading 89,1 kg/m (18 lbs/sq ft)
Power loading 5,62 kg/hp (12.4 lbs/hp)
Normal fuel capacity 150 liters (33 Imp gal)
Extra fuel 59 liters (13 Imp gal)

Performance

Maximum speed 290 km/h (180 mph)
Cruising speed @ 8000 ft 265 km/h (165 mph)
Minimum speed full load, flaps down 105 km/h (65 mph)
Climb rate at S/L 6,49 m/sec (21,3 ft/sec)
Practical ceiling 6.096 m (20,000 ft)
Take off run - land 274 m (300 yards)
Take off time - land 14 secs
Landing run - land 201 m (220 yards)
Take off run - water 421 m (460 yards)
Take off time - water 28 secs
Normal range 901 km (560 miles)
Maximum range 1.247 km (775 miles)

(FIAT FN-333 Brochure # 1348, ca. 1958)

FN-333 Riviera (Production)

 I-RAIA
Production FN-333
Main wheels folding into aft fuselage

TECHNICAL DESCRIPTION


ENGINE

The FN-333 is powered by a Continental IO-470-P horizontally opposed, six-cylinder engine, rated at 250 horsepower at 2,600 RPM.  The engine utilizes a wet sump oil system, dual magnetos, continuous flow fuel injection and a jet augmenter exhaust system.

THROTTLE
The throttle has a knob and a knurled friction adjusting sleeve by which proper friction drag may be applied to the throttle control.   To operate the control, grasp the knob between the thumb and two fingers and push in the knob to advance the throttle, or pull out to retard.  Turn the knurled sleeve clockwise to increase the friction drag and counterclockwise to decrease the friction drag.

NOTE - Because of the constant speed propeller mechanism installed on the airplane, advancing the throttle will not increase the engine RPM.  It will increase the manifold pressure.  With each power increase, the constant speed propeller automatically takes a larger pitch, enabling the engine to run at a constant speed at all times.  Engine RPM can be changed by adjusting the propeller control.

MIXTURE CONTROL
The mixture control incorporates a friction lock button to secure it at the desired position.  Push the control in to enrich the mixture and pull out to lean.  To stop the engine,  pull the knob to the IDLE-CUT-OFF position.  Turn the knob in or out for close adjustments.

IGNITION SWITCH

 I-RAIA
Production FN-333

SPECIFICATIONS (PRODUCTION)


Dimensions

Wing span 10,40 m (45.1 ft)
Length overall 7,39 m (24.3 ft)
Height 3,22 m (10.6 ft)
Length of boat hull 6,30 m (20.669 ft)
Width of boat hull 1,17 m (46.06 in)
Wheel track (center wheels) 1,96 m (77.16 in)
Tailplane width 2,66 m (104.7 in)
Wing area 15,4 m (163 sq. ft)
Cabin height 1,20 m (47.16 in)
Cabin length 2,90 m (114.00 in)
Cabin width 1,07 m (42.12 in)
Door dimensions 34,08 x 35.40 in
Baggage space 0,425 m (15 cu. ft)
Propeller diameter 2,15 m (84.64 in)

ENGINE

Make Continental
Model IO-470-P
Power 250 hp @ 2600 RPM

Weights and Loadings

Weight empty 1.030 kg (2,270 lbs)
Useful load 455 kg (1,000 lbs)
Maximum weight 1.485 kg (3,270 lbs)
Wing loading 96,4 kg/m (20.05 lbs/sq ft)
Power loading 5,94 kg/hp (13.08 lbs/hp)

Performance

Max. speed as sea level 285 km/h (177 mph)
Stall speed gear down, floats up, flaps 45 109 km/h (68 mph)
Cruise speed at 75% pwr at 8,000 ft (max.) 264 km/h (164 mph)
Fuel consumption at 75% cruise 48,8 l/h (12.9 US gal/h)
Cruise speed at 75% pwr at 8,000 ft (rec.) 245 km/h (152 mph)
Fuel consumption at 60% cruise 42 l/h (11.1 US gal/h)
Service ceiling 5.639 m (18,500 ft)
Normal range at 60% pwr at 8,000 ft 1.005 km (625 miles)

(SIAI-Marchetti brochures and FN-333 Owner's Manual)

FN-333 Instrument Panel

 I-RAIA?
Production FN-333?
Instrument Panel

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Updated 2019-12-27

2004-2019 Steinar Saevdal