Setting Up a Mechanical/Electrical Inertia Measurement of Propellerarm

AI Thread Summary
The discussion focuses on setting up a mechanical or electrical measurement system for assessing the inertia of a rotating propeller arm as thrust increases. The user seeks suggestions for effective setup methods, considering options like force springs, pendulums, and timers. Clarification is requested regarding the application, specifically whether the thrust increase results from motor power adjustments or propeller pitch modulation. Additionally, there is a need for a precise mathematical definition of "inertia" in this context, as it may differ from traditional definitions. The ultimate goal is to experimentally demonstrate the thrust-to-inertia relationship for a flight robot with omnidirectional capabilities.
Ginorizz0
Messages
2
Reaction score
0
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.
 
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
 
Thread 'What type of toilet do I have?'

Thread 'What type of toilet do I have?'

I was enrolled in an online plumbing course at Stratford University. My plumbing textbook lists four types of residential toilets: 1# upflush toilets 2# pressure assisted toilets 3# gravity-fed, rim jet toilets and 4# gravity-fed, siphon-jet toilets. I know my toilet is not an upflush toilet because my toilet is not below the sewage line, and my toilet does not have a grinder and a pump next to it to propel waste upwards. I am about 99% sure that my toilet is not a pressure assisted...
View full post »

Thread 'Thread No-Go plug gage allows 3 turns to enter. That's too many!'

After over 25 years of engineering, designing and analyzing bolted joints, I just learned this little fact. According to ASME B1.2, Gages and Gaging for Unified Inch Screw Threads: "The no-go gage should not pass over more than three complete turns when inserted into the internal thread of the product. " 3 turns seems like way to much. I have some really critical nuts that are of standard geometry (5/8"-11 UNC 3B) and have about 4.5 threads when you account for the chamfers on either...
View full post »
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
View full post »

Similar threads

Ball bearing cantilever system with maximal moment of inertia
Replies
16
Views
2K
Springs: Can they be used to conserve energy?
Replies
2
Views
2K
Is a Larger DC Motor Needed for Low Wind Speed Power Generation?
Replies
34
Views
4K
Other Mechanical drafter moving to electrical engineering
Replies
6
Views
2K
Automatic Window Lift: Get Help Setting Up Low-Cost, Efficient System
Replies
4
Views
2K
EE in maritime
Replies
4
Views
1K
How do you measure time on a tide locked planet?
2
Replies
87
Views
9K
Experiment to measure EM waves
Replies
4
Views
2K
How to Apply Derivatives in Physics Problems?
Replies
9
Views
1K
Projectile Measurements: RPM, Position, Velocity, acceleration
Replies
1
Views
4K

Hot Threads

Recent Insights

Back
Top