Why are we not seeing more variable-pitch quadcopters?

  • Thread starter Jarfi
  • Start date
In summary, after researching propeller-pitch, it has been found that a variable-pitch-propeller is considered superior, with a constant-speed-propeller being the most efficient. However, there are potential drawbacks to using variable-pitch propellers, such as added weight and slower response time. This may limit their use in high-speed quads, as the ESC can change at a faster rate than a mechanical or servo system. Despite this, research is being conducted on variable-pitch quadcopters, including those powered by petroleum.
  • #1
Jarfi
384
12
Been doing some research on propeller-pitch. And it seems that a variable-pitch-propeller seems superior, with a constant-speed-propeller(adjusting pitch for constant RPM) seems the most efficient of all.

A quadcopter with a low RPM will generally spend less energy on air-drag so we have more efficiency. The problem is once you accelerate the RPM increases and efficiency is lost due to airdrag, similar to a car in a low gear driving fast, causing a too high RPM of the engine itself, which wastes energy.

I've seen a few variable pitch-quads, most seem to be in the development stage, there are even petrolium variable-quads being researched.

My question is, are there(other than added weight) some big mechanical drawbacks to having a variable-pitch propellers over a conventional propeller?

Also will all the professional high-speed quads be using variable-pitch like helicopters in the future?
 
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  • #2
Cost and complexity.
 
  • #3
russ_watters said:
Cost and complexity.
Already got answers on another forum, cost and complexity is an extra factor but this one seemed convincing:

the big issue is slow response time to change, The ESC can change at 400Hz, and go from 0 to 100% in close to the same time,I don't see a mechanical system or servo system getting close to 20Hz and staying in one piece long enough to fly.
 

Related to Why are we not seeing more variable-pitch quadcopters?

1. Why are variable-pitch quadcopters not more common in the market?

The main reason for the lack of variable-pitch quadcopters in the market is the complexity and cost involved in designing and manufacturing them. Variable-pitch quadcopters require advanced technology and precision engineering, making them more expensive compared to fixed-pitch quadcopters.

2. What are the advantages of variable-pitch quadcopters over fixed-pitch ones?

Variable-pitch quadcopters offer better control and maneuverability, as the pitch of each rotor blade can be adjusted individually. This allows for more precise and agile movements, making them ideal for tasks such as aerial photography and videography. They also have a higher payload capacity and can fly longer distances due to their improved efficiency.

3. Are there any disadvantages to using variable-pitch quadcopters?

One of the main disadvantages of variable-pitch quadcopters is their complexity, which can make them more difficult to fly for beginners. They also require more maintenance and repairs compared to fixed-pitch quadcopters, as the individual rotor blades are more susceptible to damage.

4. Is it possible to convert a fixed-pitch quadcopter to a variable-pitch one?

While it is possible to convert a fixed-pitch quadcopter to a variable-pitch one, it is not a simple process and would require significant modifications to the frame, motors, and control system. It is often more cost-effective to purchase a variable-pitch quadcopter instead of attempting to convert one.

5. What advancements in technology are needed for variable-pitch quadcopters to become more popular?

To make variable-pitch quadcopters more accessible and affordable, advancements in technology such as lighter and more powerful motors, more efficient control systems, and more durable materials are needed. Additionally, advancements in artificial intelligence and autonomous flight systems could also make variable-pitch quadcopters more user-friendly and easier to fly.

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