Gas+electric hybrid multi-copters ...


Hi All,


We have recently discovered a way to build hybrid gas/electric-powered multi-copters and would like to share it with you.


The main advantages are:

1) Heavy lift - due to gas engine power

2) Long endurance - due to high gas fuel power density

3) Safety - power source redundancy for safe landing


For the full description of the idea please have a look at:

We are also looking for partners to help us with prototyping and commercializing the idea.

You comments in the blog are welcome ...


Best Regards,

The team

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  • @the sun, you are being a bit of an arse hole to people, almost all your posts are derogatory or plain rude

  • @Mike Klinker - I couldn't agree more.

  • Differential gears ?

    Is it a joke ?

    If not, IMHO, efficiency of the system = zero

  • Seems to me you are adding significant mechanical complexity without any significant gains anywhere else. Surely a simple gas powered helicopter gives the same result. Long duration , good lift capacity and better efficiencies.
  • Jared Reabow, that is basicaly what I said! Look at Curtis Youngbloods Stingray, it could easily be build with an ic engine.

  • This is comical. 

  • simpler idea, central shaft with each rotor belt driven, each rotor is variable pitch, sorted!

  • Probably better to use the IC engine to drive one or more (extra) props/blades directly or via reduction belts to lift some of the weight and unload the motors. I think its been done.

  • @Dwgsparky You didn't actually contradict anything I said, so I fail to see the holes in my "theories". You're definitely contradicting what OP is saying though. I said OP's design requires expensive high performance slip rings to be feasible, OP says it doesn't, and you say it does. My only points about alternators were that they are less efficient than drive trains, your post agrees. IC engines definitely produce heat (just like literally every closed system - second law of thermodynamics), but, if as I suggested, you're only running at the peak efficiency point, you waste less energy than if you're throttling up and down, which is what OP suggested (admittedly after your first post).

    I'm getting the impression that there has been a lot of miscommunication, because OP's design isn't very clear or well documented (a simple transient analysis of pitching would be nice) and then we all filled in the details on our own. Now we all seem to be debating very different ideas. However, you are still being unnecessarily rude when the rest of us are having a civil discussion. Though you're claiming to be an engineer, you seem to be missing some major fundamentals - like when you said that a generator doesn't use an internal combustion engine, or  how you're incorrectly analyzing inertial reference frames. But, I guess you're not going to waste your time. Good riddance. I suggest you take the time to open your mind to new ideas once and a while, and help develop their ideas instead of shooting everyone down. A forum is for collaboration, not an ego trip.

    Armen, I appreciate the cleverness that you put into the blending of these designs, and I'm happy to discuss it further with you, but I'm getting the impression that this forum isn't the best place for it. If you'd like, you can send private messages from the link in my profile.

  • Moderator

    @ Tyler. I'm sorry but your theories are full of holes. if you have finished laughing then learn.

    In the drawing the green shafts go to the motor bottoms , they must connect either to the motor shaft or the motor frame. if they are attached to the shaft then the prop will always spin at shaft speed. If you add motor power it will reduce the load on the gas motor but the system will keep approx the same speed.

    If the green shaft is attached to the motor frame then the frame will turn at shaft speed and the prop will not move unless you add motor current, The motor current is related to the load on the motor caused by the speed of the prop, you may get a slight increase in prop speed for the same current but not much.

    The connections to the motor will require slip rings and guess what, they have a lot of rotational resistance.

    Generators- a standard alternator/generator running at 3600 or 1800rpm has losses relating to windage (air movement caused by the rotating parts) + bearing losses + magnetising losses.. If you want to run the same Alt/gen at 12000rpm the losses will be more than 4 times the losses at 3000rpm.

    Gearboxes. If you find a gearbox with no losses caused by the lubricant and that will run at 12000rpm then I will be surprised.

    IC engines- you need to carry the fuel, tanks pipes etc, the engine produces heat that all take away from the efficiency of the system as a whole.!

    I am not going to waste anymore of my time on this post as you are trying to pursue something that will never work. However, you might be advised to consider an Octo copter with 4 props driven by the gas engine for lift and the other 4 for control and manoeuvering , at least you may have a chance of getting of the ground.! 

    Before you decide I am crazy you need to know that I have spent over 40yrs as a mechanical and automation engineer. good luck and goodbye.

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