HungaroCopter – Hungaro Helicopter

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The Hungaro Helicopter´s Specifications

• Rotor radius / diameter: r = 3500mm / D = 7000mm

• Number of blades: N = 2 pcs

• Blade´s profile: NACA0012; (type: Schweitzer, MD500)

• Size of rotor surface: Ar = p*r2 = p*(3,5m)2 = 38,465m2

• Surface load of rotor: DL = 102,01N/m2

• Main rotor rpm: n2 = ((w2)/(2PI))*60sec = 545,95 rpm

• vmax = 200m/sec

• Engine: n1 = 4900 rpm; w1 = 512,91 1/sec. (nominal rpm)

• Tail rotor rpm: n = 3000 rpm

• Calculated uplifting: 6,5 m/sec

Hungaro Helicopter Main rotor

• Input rpm: 3000 rpm

• Input torque: 255Nm

• Output rpm: 545 rpm

• Output torque: 1490Nm

Hungaro Helicopter Tail rotor

• Input rpm: 3130 rpm

• Input torque: 35Nm

• Output rpm: 3130 rpm

• Output torque: 35Nm

Hungaro Helicopter Pulley with free-run sprag clutch

• Rpm: 3130 rpm

• Torque: 255Nm

• Pulley tightener force: 10000N

Hungaro Helicopter Pulley and engine shield

• Rpm: 5300 rpm

• Torque: 150Nm

• Pulley tightener force: 10000N

Hungaro Helicopter Frame

• Max uplift weight: 430kg

• 7000 millimetres = 22.9658793 feet (22 feet 11 + 19⁄32 inches)

“You probably haven’t seen this one yet. They have a booth at the tradeshow in Freidrichstafen Apr 15-16th. Similar construction to a Cicare CH-7 but simpler and using a Subaru engine (good choice). Lots of power. Listen to that motor hum (Supertrap muffler?). Looks like a well engineered product, using what appears to be Robinson tail feathers. There are 3 other videos on the page.”

Looks like they borrowed the panel from an old R22 & reworked it a bit. The slotted section of that rotorblade looks like an attempt to soften the blades torsional rigidity. I fear cracks eventually may start at each slot. It sure looks like it is fun to fly…

When I see someone designing and building an all new ship, no matter how great the workmanship appears, I keep in mind what I once read from Frank Robinson’s writings. I may have the exact percentage wrong but I think I’m close.

He said 80% (??) of the design cost, 80% of the production cost, of any helicopter, is in the gearboxes and rotor blades. For any helicopter builder’s handiwork to impress me, I need to see details of a MRGB, TRGB, and rotor blades, first, before a beautifully powder-coated frame.

When BJ sent me a 1+ hour video of disassembled, miniaturized Jet Ranger MRGB and TRGB that were destined to be the heart of the Helicycle, I WAS IMPRESSED. The oil system, the pinion and ring gear, the bearings, the casting, etc. really blew me away.

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Hungaro Copter Rotor Blades

The composite materials are the most suitable to meet the aerodynamics and mechanical requirements for example: low structural mass, but also durable rotor blades. In the aerospace industry, the most widely used matrix composites are the carbon fiber, fiberglass and carbon fiber epoxy resin reinforced with aramid-fiber, from the wide variety of these components, the materials have to be selected to manufacture of the rotor blades and to define the manufacturing processes.

During the design of the blades, and by the requirements of strength-, stiffness-, the manufacturability is also has to be taken into account under the circumstances, therefore, a solid shaft, a closed box structure (monolithic) main spar has been developed, which is carboxylic aramid hybrid epoxy pepreg which is suitable recording the full load what is affecting to the rotor.

Whereas the order of layers of unidirectional (UD – Uni Directional) 0o orientation (the paddle same longitudinal axis direction) carbon reinforcing fiber webs, and +/- 45 ° fiber direction of carbon tissue has been designed, optimized in accordance with the loads occurring. The monocoque sandwich structure is reinforced with Nomex honeycomb.

Written by Imre Koncz aircraft-mechanical engineer.

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EDITOR: In my personal opinion – this is the vision of the “perfect homebuilt helicopter”. An affordable, reliable four stroke engine, nicely triangulated airframe, and advanced composite rotorblades for improved flight control and efficiency.

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PRICE LIST (2019)

Hungaro – Copter HC-01 kit prices including the following parts;

A – Main gearbox, with main rotor shaft.

Price: 6,980 Euro

B – Tail rotor gearbox.

Price: 6,994 Euro

C – Tail boom is assembled with drive shaft and bearings, ready for installation.

Price: 2,880 Euro

D – Upper pulleys with free-runner and bearing journal boxes, ready for installation.

Price: 3,680 Euro

E – Downer pulleys, complete engine cover, ready for installation.

Price: 2,930 Euro

F – Belt tensioner, trundle and arm, ready for installation.

Price: 1,920 Euro

G – Swash plate.

Price: 2,660 Euro

H – Rotor hub without the connections of the blades.

Price: 3,735 Eur

I – Skids.

Price: 1,980 Euro

J – Framework.

Price: 2,890 Euro

K – Main rotor (carbon fiber).

Price: 7,200 Euro

L – Tail rotor (carbon fiber) with hub.

Price: 2,810 Euro

M – Subaru EJ 22 (136 Hp) engine fully repaired with original parts.

Price: 3,900 Euro

N – Instruments Panel with Kanardia nesis instrument.

Price: 5,200 Euro

O – Rescues system with Kokam batteries and NT power BLCD motor.

Price: 12,000 Euro

P – Complete control system.

Price: 2,900 Euro

Q – Fuel tanks made of aluminum.

Price: 1,950 Euro

R – Fuel system.

Price: 1,400 Euro

S – Complete electric loom.

Price: 2,750 Euro

T – Water cooler system.

Price: 1,800 Euro

U – Paint.

Price: 1,000 – 1,500 Euro

Prices correct at time of printing.

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