HG3 the era of quad variable pitch has begun!


This is the english translation of original Blog Post of Giuseppe D'Angelo for our international member

Hello everyone,

I joined this community, although I'm not sure how it works ... Forgive me if I make a few CZ! ;-)

However, I would make a small contribution with my modest experience.

Few years back, going on holiday by car, I was in the queue under the blazing sun,

I triggered the inspiration of the bird!

The quads were in their infancy, someone dared to put together some gyroscope, others deviated towards a sedge .... All very fascinating to me that I was starting my modeling career!

By trade I've always done and the technician AF, but micro-mechanics and electronics has always captured my attention.

On that hot July day, I called the phone my friend John, a veteran model maker, brilliant mind with notions of physical, take the first question ... why quads are so clumsy and unstable? Analyzing the characteristics attributed to all gyroscopes and especially latency in the correction of attitude, due to inertia of the engine block / helix.

How to improve this ... a quad variable pitch?, Yes ..

Leaving constant speed could vary the pace, to correct not expect the rotors take turns, but already had the motor system, it had a reserve of energy "Ready" to be converted by the variable pitch propellers, so everything is spinning as oil, in fact you could only use one engine for propulsion, with all the benefits that could arise.

Doing the math with the rotations and couples began the first problems that rose when they entered the game blends ... The project was aborted at birth ....

In the days that followed, and by re-quadricottero by the variable pitch did not want to abandon my mind and slowly, were overcome all the dark sides were holding at least theoretically grounded quad.

Resolved, though with reservations to check later, all the mechanical problems related to the management, I decided to try! By investing time and money in building a simulacrum, to test the theory.

I began to jot down some notes on building and designing the various parts of the main building, starting with the gearbox, which is the reduction and reversal of rotation

I tried to minimize costs, partly because there were those doubts fugabili unfortunately only with a test-fly ...

Earlier this year, and ... ready Mechanics, powered by two electric motors ... the missing pilot.

I started a new adventure for someone to make me a dedicated software for my maxi-quadricottero!


4 propellers of 70 cm each propeller can be used up to 120 cm.

Dimensions: 2.50 x 2.50 m

Power supply: 12s Lipo

2 total engine power: 4400 W

Weight 6.5 kg take-off

Many people are frightened when he saw the car waiting just a bit of software, a project without a doubt very challenging but not impossible, I bought a bit of hardware and systems development, in despair, I tried the DIY, but obviously not programmer and 45 years can not be learned, including a trial period, the quad has been hung up for about two years, until I came across a forum, and in some RedFox ... The name did not inspire much confidence, but after all, I decided I felt too.

Contrary to his nickname Roberto, for me, is a nice person, very friendly, competent and humane!

There was now a certain feeling, and together in a few weeks, we have developed a hardware capable of driving my car, since then I baptized HG3.

Few tests are enough to understand that he could fly, and after the third try here are the results.

One of the tests

HG3 Willy

HG3 served to test my project and the control board, now left the table to be hung on a nail, giving way to his successor HG3.2

About HG3 find info here.

HG3.2 is a machine designed to "raise weight and experience other sources of propulsion ...


For now

Giuseppe D'Angelo


HG3 the era of quad variable pitch has begun!
Hello everyone,
in this video you can see the first pre-flight testing on the new HG3.2 the Multicopter has the following features:
Created by Joseph D'Angelo
Hardware and firmware development: Roberto Navoni
Electronic Edge: Ardubotix 1.0A (Multipilot)
Wheelbase: 1.65 m
Maximum dimensions: 2.60 x 2.60 m
V2 Version: hybrid
Electric Motor: Hacker A60
Petrol Engine: Zenoah
Blades: SAB Composite
Frame: DIY
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  • Hi Morli,
    I'm happy that you like our project .. a big thanks to Pipposoft for his Great Job, he his Archimede Pitagorico of mechanics thinks . We discuss about the status and the future of the project in the next Dev Conf that will have at 2 September 22.30 (ROME TIME).
    So i can update about the next step also for beta tester and availability of frame electronic ecc.
  • many others like me will join the testing soon. Is beta frame available some where? I was visualizing similar concept using clone Trex 450 tail assembly ( from hobby king) few months back but due to work and other constraints it is still a dream. Good work guys. cheers
  • Thanks Roberto for feedback. yes it will be a fun if not a challenge to see if nitro or gas( preferable) engine could be used. A 15 cc or 23 cc petrol engine would be perfect size. I can recommend RCGS 15, 26 cc engine which I have flown and is cheapest engine I know of. Looking forward to see more news/development and sucess stories from the Redfox team, hopefully
  • Hi Morli,
    we're working to the new version of HG3.2 Our idea is to implement the last revision of frame that yet working and developing a new one ... with the possibility of more payload and ability of different kind of engine . Not only electric propulsion.
    As you can see in our video the HG3.2 Yet fly . Multipilot Board is the core of our HG3. Our big problem was the vibration , but we solve it using good acc and gyro and some good mechanics idea.
  • Inspiring work guys. Hopefully I will be able to make and fly one of this size/type soon with right support. Thanks

    best regards
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