HungaroCopter – Hungaro Helicopter

Smooth flying Hungaro Helicopter

Hungaro Helicopter


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.



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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Hungaro Helicopter - HungaroCopter
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