twp650-02.html - 2009, July -
Updated: 2017, August. 16th/A


AG - AGRICULTURE - One pilot + 300 Kg tank of chemical product + Spray System
AM - AMBULANCE for two - One pilot + 2 Doctors + 2/4 Patients
AM - AMBULANCE for four - One pilot + 1 Doctor + 4 Patients
CA - CARGO - One pilot + 300 Kg cargo
CO - COMBO - One pilot + one passenger + 200 Kg cargo
DE - ARMOURED - With ballistic protection - Defence & Security
FL - FLOATS - for amphibian operations
FT - FIRST CLASS Seats - 1 pilot + 4 seats + 100 Kg luggage + Extra air conditioning system
LE - LAW ENFORCEMENT - One pilot + 1 or 2 Operator/s + 50 Kg / 100 Kg of equipment or extra tank
LR - LONG RANGE - With 200 lt extra tank - 1.000 / 1.500 Km of range -
ND - NOT DETERMINATE - Ready for any different configuration -
PA - PATROL - One pilot + 1 to 3 operator/s + Pan & Tilt mounted LED Spot Light : 100 Kg of equipments
SO - SPECIAL OPERATION - One pilot + 3 operators + 100 Kg equipment
ST - STANDARD PASSENGERS - One pilot + Five passengers - Business class seats + 50 Kg luggage
TR - TROOPER - 1 pilot + 4 operators + 100 Kg of equipments
VP - VIP - 1 Pilot + 4 Seats + 50 Kg luggage + extra air conditioning system

- AGRI KIT - Specification - Click on:- Ghibli 160 / Ghibli 160 "Titanium" / Ghibli 260 / Twinpower 520 -

2010, 2nd of June- CH-46 R.C. model made in Italy by Mr. O. Varalda -

- Specification - FRENCH.

- Sketch - Pictures and Lay-Out

- 3 D - Images & Pictures -

- The TANDEM PROPULSION : Dynamic Studies - Pictures -

- LAY-OUT : Sketch and Pictures -

Tandem Rotor Helicopters

In opposition to single rotor helicopters, tandem rotor helicopters do not suffer from uncommanded yaw.

The two large horizontal rotor assemblies mounted one in front of each other are counter rotating so they cancel out the torque produced from the rotors.
One of the major advantages of tandem rotors is that all the power produced by the helicopter engine can be used for lift, while in single rotor helicopters part of the power produced by the engine is used to counter the problem of torque.

Tandem rotors also have a large center of gravity range and good longitudinal strength.

The two sets of rotors allow for more weight with shorter blades.

Disk loading, which is the comparison of the helicopter’s mass to the area of the main rotor disk, is lower in tandem rotor helicopters.

Disk loading indicates how efficient a rotor system is, and the lower the loading the more efficient the helicopter.

Helicopters with tandem rotors also use less power in hovering or low speed flight.

Cons of Tandem Rotor Helicopters

Noted problems with the tandem helicopters are the need for two large rotors, reauiring a complex transmission.
This transmission must be linked between the rotors to ensure the rotors are coordinated so they do not hit each other.

In addition, the efficiency of the rear rotor can be compromised by the front rotor.

This can be lessened by boosting the distance linking the rotor hubs.

Examples of tandem rotor helicopters include the Boeing CH-46 and 47.

Though tandem rotor helicopters have been successful and safe, very few companies in the United States have built helicopters with the tandem design with the exception of Bell Helicopter.

The "TWINPOWER 650" is a turbine or a piston' engine - ( V-8 piston engine GM LS7 ) helicopter that closely resembles a Chinook.

Some have compared the profile of the Twinpower 650 to a "scaled-down Chinook" in appearance.

With seating for 8 and a projected cruise speed of 153 km/h - 74 kts , this new The TWINPOWER 650 helicopter will radically change most people's idea of a double - rotors helicopter .

Boasting an impressive 2400 Kg max. gross take - off weight and a projected 1500 Kg empty weight, useful load on the finished Twinpower 650 is expected to be in the 900 Kg. range.

With 450 l - fuel capacity, Aviotech expects the helicopter to have a range of about 600 Km.
This is an helicopter that can "get the job done".

The cabin will be capable of maintaining the helicopter's 10,000' service ceiling.
The Twinpower 650 also boasts ample headroom and legroom in its comfortable 1.80 x 1.80 x 9 m ( 6' x 6' x 30' ) cabin.

The Twinpower 650 is powered by one 650 HP Pratt & Whitney or Roll Royce turbine or by a new V-8 piston engine running with standard unleaded gasoline.

- Technical Data - Performance -

SOUTH AFRICA Certification: NTCA
USA: Experimental
Rotorhead - Rotor blades original design went thru Sikorsky and FAA engineering and flight testing programs.

Fuselage Total Length: 9000 mm ( 30' ) approx.
Fuselage Max Height : 4200 mm ( 13' )approx.
Fuselage - Cabin Width Int. : 1800 mm ( 6' )
Fuselage - Cabin Internal Height: 1800 mm ( 6' ) approx.
Fuselage - Cabin Width - Ext. 2000 mm ( 6.56' ) approx.

Rotor Diameter : 10 m ( 33' )
Main Rotor Chord Length : 203 mm
Blades: 3 + 3

Fuselage - Max Width with external tanks : 3.30 m ( 11' )
Total length with blades : 16.50 m ( 55' ) approx.
Parking area: 17 m x 10 m ( 56' x 33' ) approx.

Weights and Capacities.
Gross Weight: 2400 Kg - 5291 Lbs -
Empty Weight: 1500 Kg - 3306 Lbs -
Useful Load : 900 Kg - 1984 Lbs -
Standard Fuel Capacity: 450 l - 118 US Gallon -( n° 2 tanks )
Fuel consumption: 108 -110 l/h - Turbine configuration -
Oil Capacity: 40 l - 10.4 US gallon
Radiator Capacity: 2 x 25 l
Gross and Empty weight and fuel consumption : preliminary data to be confirmed on order in relation to the installed engine.

Cargo Capacity and Configurations - Flexibility and multi-role capability.
Economy class configuration: Seats 7 + 1
Tender: Pilot + 5 business class seats.
VIP : Pilot + Body guard or mini bar + 4 First Class seats.
Patrol : 3 Seats + extra tank
Ambulance: 2 seats + 2 stretchers + medical equipments
Cargo: 2 seats + 400 Kg - 4 cum.
Combo: 4 seats + 300 Kg - 3 cum
Agri-kit: 1 seat + 585 Kg of max. weight.
System weight: 186 lb / 85 Kg
Capacity: 130 US gallons / 492 lt
Boom Spam: from 33 ft / 10 m up to 50 ft / 15 m
Swath width: 55 - 65 ft / 17 - 20 m and more.

Maximum speed: ( VNE ) 160 Km/h - 100 MPH - 87 kts
Cruise Speed: 153 Km/h - 85 MPH - 74 kts
Consumption: 108 - 110 Lt/h ( 82.9 - 83.1 Kg/h ) turbine configuration.
Endurance: approx. 4 h + reserve
Endurance with 450 l ( 118 US gallons ): approx. 4 h ( Turbine cnfiguration )
Range - Standard configuration: approx. 600 km + 30 Km reserve ( 390 nml ) - Turbine configuration -
Max rate of climb: 950 F.P.M ( 290 m/min )
Service Ceiling: 3000 m - 10,000 ft
Hover IGE : 2100 m - 7,000 ft
Speed, endurance and range :
preliminary data to be confirmed on order in relation to the installed engine.

Long Range Configuration
Crew: 2 + luggage - 200 Kg Total
n° 2 External fuel tanks to be installed
Total fuel capacity: 900 l ( 236 US Gallons )
Endurance: approx. 8 hours
Range: approx. 1200 Km - 780 nml -
Speed, endurance and range : preliminary data to be confirmed on order in relation to the installed engine.

Rotor System
Three blades per hub ( Two hubs ).
Fiberglass construction.
Speed: 220 r/min

TWINPOWER 650 - Propulsion specification - Turbine or cam-in-block 90-degree V-8 engine

TWINPOWER 650/P - Engine - Pratt & Whitney
Take-Off Power ( WPS) 650 HP
Continuous Power (WPS) : 540 HP
Height: 21" - 25" ( 530 - 635 mm )
Width: 22" ( 560 mm )
Length: 64" ( 1630 mm )
Weight: 190 Kg approx.

Pratt & Whitney turbine specification: intended as preliminary and to be confirmed on order.

TWINPOWER 650/R - Engine - Rolls Royce
Mod. 250 - Series IV
Type: C 47 B/M -
FADEC by Rolls Royce
Power: 650 HP - 480 Kw
Air Flow rate : 2.77 Kg/s
Pressure ratio: 9.2 : 1
Take-Off Power ( WPS) 650
Continuous Power (WPS) : 600
Height: 638 mm
Width: 555 mm
Length: 1040 mm
Weight: 124 Kg

Rolls Royce turbine specification: intended as preliminary and to be confirmed on order.

TWINPOWER 650/M - Piston engine
Engine configuration: V8
Max power - Automotive use -: 1000 HP ( 750 Kw )
Max power - Aeronautical use -: 650 HP ( 484 Kw )
Continuous Power (WPS) 600 HP ( 447 Kw )
Torque: 1000 Nm - 1200 Nm ( 737- 885 ft.lbs)
Weight: 230 Kg approx. ( 507 lb )
Engine type cam-in-block 90-degree V-8
Displacement: 7,2 l ( 1.90 US Gal )
4 Stroke
Paralleled twin-turbo.
Consumption: 70-80 l/h ( 18.5 / 21.1 US Gal/h ) in relation to use.
FADEC ( Fully Automated Digital Electronic Control ) - Electronic Throttle Governor.

Engine specification: intended as preliminary and to be confirmed on order.

FUEL: Standard Automotive Unleaded Gasoline - 91 AKI minimum per ASTM D 4814 or EN 228 Automotive Fuel -
Refer to the latest revision of SI 1070 for a complete listing of approved fuels.
European Unleaded Petrol: verify specification prior to use.

Important Remark

Since early in the industrial program a General Motors all aluminium engine was available as an optional powerplant.

As an alternate fuel option we are making available again the all new small block LS7 engine by General Motors.

All aluminium and 427 cubic inches this engine makes 505 horsepower at 6300 rpm.
Installed in the Ghibli 260 the LS7 is only running at 3400 rpm.

Designed to use 91 octane automobile fuel, consumption is 9 gallons per hour giving the Ghibli 260 a 570 mile range.
Installed on the TWINPOWER 650 is able to provide 650-700 HP as standard cruising speed power.

The engine is unique in that it is built by the GM Performance Department and specially modified for our use.
Using the best 2008 technology the LS7 has titanium connecting rods, titanium valves, roller camshaft and rockers, all aluminium 6 bolt block and composite intake manifold.

Dual computers are installed for electronic redundancy that manage the variable ignition timing and fuel injection.

A glass cockpit display panel offers engine health monitoring and can be individually configured for additional visual and audio functions.

This is real FADEC technology designed by the best engineers in the world.

Air conditioning and heating system are available as well as electronic throttle governor.

The basic engine is currently in a FAA certification program in another application.
We are making it available again as an optional powerplant using automobile fuel!


Over the years many people around the world have asked "Do you have an engine that will run on automobile fuel?"
Many areas of the world do not have access to 100 LL aviation fuel.

With the thought of the Environmental Protection Agency outlawing leaded aviation fuel, we decided to bring back our V-8 powerplant as an optional engine in the GHIBLI 260 and TWINPOWER 650.

We decided to use the General Motors LS7.
This engine is specially designed and built for the GHIBLI 260 and TWINPOWER 650.
It is not a stock LS7 engine.
This engine is configured with the best components available on the market including forged crankshaft, connecting rods and pistons.

A special designed camshaft optimizes torque and horsepower at the continuous r.p.m. of 3250 for the helicopter tyoe Ghibli 260.

A newly designed cast aluminium oil pan and specially designed cylinder heads have been created specifically for the GHIBLI 260 helicopter.

The exhaust system required extensive test cell time in order to optimize the power curve.

The computer system is programmed for the GHIBLI 260 and TWINPOWER 650 application with redundant communication with critical input sensors.

The throttle is fly-by-wire and is fully governed when set.

Wide band of sensors provide the capability to use 87 octane auto gas up to 100 LL aviation fuel.

The oil system is a dry sump design with an optional oil cooler for extreme operating conditions.

It operating to 650 h.p. and will produce 650 h.p. up to 12,000 feet.
This is the only helicopter available that provides sea level performance to 12,000 feet with a piston engine using auto gas.

Engine installation is simple and easy to maintain.

It starts like your car, runs smooth, and is quiet.

Engine type cam-in-block 90-degree V-8
Block configuration cast aluminium with pressed-in cylinder sleeves and 6-bolt, forged steel main bearing caps.
Bore x Stroke (mm / in) 104.8 x 101.6 /4.125 x 4.00
Displacement (L / cu in) 7.0 / 427
Crankshaft forged steel
Connecting rods forged titanium
Pistons cast aluminium
Compression ratio 11.0:1
Cylinder heads CNC-ported aluminium; 70-cc chamber volume
Valve size, intake (mm / in) 56 / 2.20 (titanium)
Valve size, exhaust (mm / in) 41 / 1.61 (sodium-filled)
Camshaft hydraulic roller; 15 mm (.591 in) lift (intake and exhaust)
Rocker arms 1.8:1; offset (intake only)
Air intake composite manifold with 90 mm single-bore throttle body
Fuel Premium required. 91 octane minimum
Racing technology transfer takes production engine performance to new heights
Racing-derived CNC-ported aluminium cylinder heads
Each engine assembled by hand by a single, specially-trained builder

GM Powertrain, using valuable data gleaned from the factory-sponsored Corvette C5R racing program, developed the LS7 with many competition-derived components and design features.

It takes production small-block performance to an unprecedented level while demonstrating the continuing adaptability of the engine's compact, cam-in-block design.

It is, quite simply, the largest, most powerful production small-block V-8 GM has ever produced.

The LS7 displaces 7.0 liters - 427 cubic inches - and is standard equipment in the 2006 Corvette Z06.
It is identified by red engine covers and is based on the new Gen IV small-block architecture.

Unlike the previous Corvette Z06 engine, the LS7 has a separate and distinct engine block casting and reciprocating assembly than the base Corvette engine.

And when compared to the LS2, it has a different front cover, oil pan, exhaust manifolds and cylinder heads.
The unique block accommodates large-displacement cylinders, while other components make use of racing-derived lightweight components to help boost horsepower and rpm capability.

The LS7's specifications are significant for a production engine:
Unique engine block with larger 104.8-mm (4.125-inch) bores and pressed-in cylinder liners
Forged steel crankshaft with 101.6-mm (4-inch) stroke
Titanium connecting rods
Cast aluminium flat-top pistons
Racing-derived CNC-ported aluminium cylinder heads with titanium intake valves and sodium-filled exhaust valves
Dry-sump oiling system
11.0:1 compression ratio
Camshaft with 15-mm (.591-inch) lift
Hydroformed exhaust headers with unique "quad flow" collector flanges.

All LS7 engines are assembled by hand at GM's new Performance Build Center in Wixom , Mich.

The exacting standards to which they are built include deck-plate boring and honing of the cylinders and even crank line-boring of the block with the deck plates and side bolts installed - procedures normally associated with the building of racing engines and almost unheard of in a production-vehicle engine.

"In many ways, the LS7 is a racing engine in a street car," said Dave Muscaro, assistant chief engineer of small-block V-8 for passenger cars.
"We've taken much of what we've learned over the years from the 7.0-liter C5R racing program and instilled it here.

There really has been nothing else like it offered in a GM production vehicle."

Indeed, the LS7's engineers spent as much time at racetracks as they did at engine dynamometers.

Everything from the cylinder heads to the unique dry-sump oiling system has a direct line back to the racing program.

But while the LS7 has racing roots, it delivers its performance with uncompromising smoothness and tractability - qualities that make the Corvette Z06 a daily-drivable supercar.

Cylinder Block & Reciprocating Assembly

The LS7's competition-proven construction is exemplified in the cylinder block and reciprocating assembly, where an all-new aluminium block casting is used to provide room for its large, 104.8-mm-diameter (4.125-inch) cylinder bores.

Inside the cylinders, aluminium flat-top pistons deliver an 11.0:1 compression ratio.

They're connected to a precision-balanced forged steel crankshaft with a 101.6-mm (4-inch) stroke via lightweight titanium connecting rods.

The titanium rods weigh just 480 grams apiece - almost 30 percent less than the rods in the LS2 V-8.

Besides being lightweight, which enhances high-rpm performance and rpm range, titanium makes the rods extremely durable.

And as with features like deck-plate honing, the use of premium titanium connecting rods typically is seen only in all-out racing engines.

Optional propulsion - turbine on request

Maker : Honeywell Engines & Systems
Model: LTS 101-600A-3A
Application: Eurocopter AS350B/AS350D/AS350BA
Maximum Takeoff Rating (shp) : 650
Maximum Continuous Power (shp) : 625
Fuel consumption ( lbs/shp) .570
Weight (lbs): 265 / 120 Kg.
Dimensions (inches) L xWxH or LxD) 31.56/19.37/24.8
Remarks: retrofit via STC; FAA certified in 1999

Maker : Turbomeca
Model: 2K1
Application: Eurocopetr EC 135
Maximum Takeoff Rating (shp) :670
Maximum Continuous Power (shp) : 570
Fuel consumption ( lbs/shp) .526
Weight (lbs): 254 / 116 Kg.
Dimensions (inches) L xWxH or LxD) 38.3/18.5/25.1
Remarks: none

Fuel System
The TWINPOWER 650 fuel system consists of two interconnected bladder cells with a total capacity of 450 liter ( 118 US Gal.)
Each bladder cell is internally supported by the airframe and contains electrically powered fuel quantity transmitters that monitor fuel level and provide fuel quantity to the pilot.
Low fuel level is displayed to the pilot through a yellow caution light on the instrument panel.
Fuel flow from the bladder cells can be manually shutoff by the pilot using a mechanically actuated fuel shutoff valve control located on the instrument panel.

Propulsion System
The engine used in the TWINPOWER 650 is the Pratt & Whitney PT6-A or the Rolls-Royce Model 250- C30 gas turbine engine ( on request ) or could be also powered by a new cam-in-block 90-degree V-8 piston engine.
The turbine produces 650 shp, for takeoff, and 540-600 shp at maximum continuous operation.
The new V-8 engine produces 650 shp for take off and 600 shp for continuous operation.

Over the years many people around the world have asked "Do you have an engine that will run on automobile fuel?"
Many areas of the world do not have access to 100 LL aviation fuel / JP4 kerosene.
With the thought of the Environmental Protection Agency outlawing leaded aviation fuel, we decided to bring back our V-8 powerplant as an optional engine in the GHIBLI 260 and TWINPOWER 650.

Engine Control Engine control is accomplished by fuel control actuation using the throttle twist grip located at the end of the collective stick.
The throttle twist grip has three positions: cut off, idle, and full open.

Moving the throttle twist grip from cut off to idle provides automatic fuel metering for engine starting, acceleration, and idle stabilization.
Moving the throttle twist grip to full open during operation increases the gas producer speed and allows the power turbine governor speed control.
The collective stick throttle twist grip movement friction is adjustable.

Dual full controls for training.
FADEC ( Fully Automated Digital Electronic Control ) Electronic Throttle Governor

All components were designed by Sikorsky for 1200 flight hours

Blades protection

Hontek sprayable erosion-protection coating system by Kaman.
Under Evaluation - Next:
BladeGuard cVG-EPS “conformal vortex generator erosion protection system,”


2016 - New avionics by GARMIN and optional

Instrument LCD panel - PFD Display - Moving Map graphics - etc
G-500H standard

Optional on request: G 600 and H-TAWS - Helicopter Terrain Awareness and Warning System
The H-TAWS Video

Optional on request: DAFCS - Digital Automatic Flight Control System -

Optional on request: GTN Series - Next -
Touch screen controls - MFD Capabilities - ADS-B Traffic and Weather - Weather Radar and more..:
The GTN Video

Optional on request: GTX ES "S" Mode transponder -
GTX ES Specification

Optional on request: SAT COMM - IRIDIUM -
GSR 56 - Specification

Optional on request: HF Transceiver with ALE by Bendixking -
KCU 1051 specification

2016 - Optional avionics/ communications systems by SKYTRAC

DAST 300 / ISAT 100 - 200 - 200A / DVI - CDP etc
Portable IRIDIUM / GPS / Phone / Text Global / etc.
Skytrac web page

- HELICOPTERS - Price list - Click on:- Helicopter and Accessories - All prices -

Armored - "AR" type.
Type of protections available:

US National Institute of Justice - Standard NIJ-0108-01:
Level III or Level IV

Australian Standard AS 2343:
Level: R2

British Standard BS 5051:
Class G3 or R1 - R2 - R3

Chinese Standard: GA 165
Class F79 or F56 or FJ79

Class: B5 - B6 - B7
Glasses: LEXAN - Fuselage : Kevlar - Dyneema - Laminated SPECTRA ballistic panels -

Fuel Extra Tank - 200 lt
- Air Conditioning
- Heating system
- Spray Kit
- Cargo Hook with winch
- Infrared TV & LLTV camera
- Special medical equipments for ambulance service

New generation AVIONIC - optional on Request -
The TWINPOWER's avionic suite introduces the very latest technology for maximum situational awareness and all-weather operations, including a full digital NVG compatible cockpit with three 8" x 10" large area displays (AMLCD) with enhanced graphics capability.

A 4-axis digital automatic flight control system (DAFCS) with dual Flight Management System (FMS) minimizes crew workload allowing single/dual pilot VFR/IFR operations.
The avionics suite also complies with satellite-based navigation, communication and surveillance requirements and has the capability to perform satellite-based IFR LPV (localizer performance with vertical guidance) approaches to maximize round-the-clock utilization of the helicopter.

Safety enhancing avionics such as Terrain Awareness Warning Systems, airborne collision avoidance systems and the innovative 'Guardian' obstacle detection device can be added to the standard avionic configuration.


- Two patients accommodations - Two seats for the medical team -
Customs data and Origin Certificate

- AGRI KIT - Specification - Click on:- Ghibli 160 / Ghibli 160 "Titanium" / Ghibli 260 / Ghibli 650 -

NDP Customs code:
880211 " Hélicoptères" civils d'un poids à vide n'ecédant pas 2.000 Kg
Civil helicopter with an Empty weight not over 2000 Kg.

Origin of the product: USA.

Pratt & Whitney - PT6A - Turbine -

- The new 650 HP V-8 - Piston Engine - 220 Kg -

- Tandem rotors aerodynamics -

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