Setting Up a Mechanical/Electrical Inertia Measurement of Propellerarm

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Discussion Overview

The discussion revolves around setting up a mechanical or electrical measurement system to assess the inertia of a rotating propeller arm, particularly as the thrust (rpm of the propeller) increases. The context includes experimental setups and potential applications in flight robotics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • George P. seeks suggestions for a setup to measure the inertia of a rotating propeller arm while the thrust is increasing, considering methods like a force spring, pendulum, or camera timer.
  • Another participant asks for clarification on the application, inquiring if the setup is for a wind farm turbine, wind tunnel, or another purpose, emphasizing the need for more details to provide better assistance.
  • George P. clarifies that the goal is to experimentally demonstrate the relationship between thrust and inertia for a flight robot with omnidirectional capabilities, indicating that the arm will eventually be actuated with the appropriate drive.
  • A participant expresses confusion about the term "rising thrust," asking whether it results from increasing motor power or modulating the pitch of the propeller, and requests a mathematical definition of "inertia" in this context, suggesting it may differ from the traditional Moment of Inertia.
  • There is a question regarding whether George P. is designing a drone, indicating a potential application area for the discussed measurements.

Areas of Agreement / Disagreement

The discussion remains unresolved, with participants seeking clarification and additional details rather than reaching consensus on the setup or definitions involved.

Contextual Notes

Participants have not yet defined key terms such as "inertia" in the context of the discussion, and there are assumptions about the application that remain unaddressed.

Ginorizz0
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TL;DR
how to setup a teststand for rotating propellerarm with rising rpm of the propeller.
Hello Everybody
I'd like to set up a mechanical or electrical inertiameasurement of a Propellerarm that is in rotation, while the thrust (rpm of propeller) is rising.
Maybe with a forcespring, a pendulum, camera (timer)...
Not sure how to set it up nicely. Any suggestions?
Best
George P.
 
Engineering news on Phys.org
Welcome to PF. :smile:

Ginorizz0 said:
TL;DR Summary: how to setup a teststand for rotating propellerarm with rising rpm of the propeller.

Hello Everybody
I'd like to set up a mechanical or electrical inertiameasurement of a Propellerarm that is in rotation, while the thrust (rpm of propeller) is rising.
Maybe with a forcespring, a pendulum, camera (timer)...
Not sure how to set it up nicely. Any suggestions?
Best
George P.
Can you say more about what you are wanting to do? Is this for some sort of wind farm turbine, or for a wind tunnel, or for some other application? The more details you can provide, the better we can help you.
 
Ty:)
The general question is: Does the rising thrust of the propeller change the inertia of the whole propellerarm.
Its about a flightrobot with omnidirectional abilities, but first i'll need to show experimentally the thrust to inertia-relation. In the end i'll actuate the arm with the right drive.
 
Sorry, I'm still not clear on what you want to do. When you say the "thrust is rising", is it rising because you are increasing the motor power to the propeller? Or are you modulating the pitch of the propeller to increase the thrust? (or both?)

Also, can you please give a mathematical definition of what you mean by "inertia" in this context? I'm guessing you mean something other than the traditional definition of the Moment of Inertia...

Are you designing a drone?

Drones-strategy-2.0-FEATURED-image-LIGHT_0.png

https://www.easa.europa.eu/en/light/topics/drones
 

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