Question about lifting up 90 Kilogram weight

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Discussion Overview

The discussion revolves around the design and construction of a small helicopter capable of lifting a weight of 90 kilograms. Participants explore various aspects of helicopter mechanics, including rotor design, motor selection, and power sources, while addressing the challenges faced by the original poster, who has limited knowledge in physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • The original poster seeks advice on the required RPM and blade size to lift 90 kg, indicating a lack of experience in physics.
  • Some participants express skepticism about the feasibility of the project, questioning the seriousness of the inquiry.
  • One participant mentions historical challenges faced by early helicopter designs, such as stability issues and the need for a tail rotor.
  • The original poster mentions plans to use coaxial propellers and requests recommendations for an electric motor and lithium battery.
  • Another participant suggests that existing lithium batteries may not provide sufficient energy for sustained flight, proposing the need for a fuel-powered engine instead.
  • The original poster inquires about resources for purchasing robotics and electric motors, indicating a desire to move forward with the project.
  • A participant notes the complexity of creating a coaxial rotor head and questions the need to slow down a propeller for the rotating helicopter body.

Areas of Agreement / Disagreement

Participants express a mix of skepticism and support for the project, with no consensus on the feasibility of lifting 90 kg using the proposed design. Multiple competing views on power sources and rotor configurations are present.

Contextual Notes

Participants highlight various assumptions regarding the structural integrity of the design, the limitations of current battery technology, and the complexities involved in coaxial rotor mechanics. These factors remain unresolved.

Who May Find This Useful

Individuals interested in helicopter design, robotics, and electric propulsion systems may find the discussion relevant.

tovolt
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I am trying to build a helicopter. please help me.
I want to know how much RPM and size of blade needed to lift 90KG of weight.

I am planning not to use tail rotators, but I have a solution for this.
 
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Is this a troll or are you serious?
 
Yes man!
did I asked anything wrong?? is it not possible.

Actually I am have not much knowledge in Physics, cause i am IT Engineer.
Due to my interest in science, I made a small helicopter. And it works.
Now i want to make a small helicopter which will lift a man.

Any suggestion will help, I will show you project design if you want.
 
The first helicopter was a chair with a rotary blade attached to the top of it. It did not go well. There are a few things they did not consider. The first is that this setup will tip over due to the change in pressure distribution the blade creates, and the chair will also rotate, although not as fast as the blade. This is considering your design is structually sound and you have enough power to get it off the ground.

The solutions were a blade with hinges that compensate for the uneven pressure distribution and a tail rotor to counteract the base rotation.

To answer your question though, it's probably not a good idea.
 
Thanks Vadar2012

I am planning to use coaxial propellers.
Can you suggest me any Electric MOTOR and Lithium battery to use in my project
 
tovolt said:
Thanks Vadar2012

I am planning to use coaxial propellers.
Can you suggest me any Electric MOTOR and Lithium battery to use in my project

Helicopters of the type exist. See this article. I don't think any existing lithium battery stores enough energy to lift you for more than a short time. You will probably need a fuel-powered engine.
 
Check out this link. I think this is what you are aiming at.
 
phyzguy thanks,

I will inform you more about the project after I start work on it.
Can you tell me any site where I can buy robotics and electric motors??
 
It is very hard and challenging task to make a coaxial rotor Head.

for rotating helicopter body In coaxial rotor I need to slow down a propeller,
is it right?
 

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