how to measure edf thrust
Do not enter a value in mm and the other in inches.
Keep the inlet and flow passage at least as large as the inlet of the EDF and keep the flow path as straight as possible.
The difference can be as much as 50% less depending on how the improper measurement is made ie: distance from the scale. There really is no recommended thrust ratio as that will vary greatly from model to model, it all depends what type of performance you want.
You'll need a Manometer and have to creat the proper ducting and laminar flow grid to get the flow striaightened, ahead of the pitot tube. I typically use a med-high power setup that gives slightly over 1:1 installed thrust. The thrust tube also can improve the airflow of air exiting the EDF unit.
While the article above isn’t strictly correct as the air is not really “compressed” at these velocities, it is correct in that the area reduction along the tube increases the air velocity so that the momentum or thrust …
What a thrust tube mainly does is help the air to accelerate. Don't have an account? Thank you both for the assist. Yes, when compared to a conventional brushless motor prop combo, electric ducted fans are generally faster, draw more amps and are less efficient. Two pieces of wood, a piece of aluminum wire and the scale. The rods are set far enough apart to where I can run a 14" prop.
Hard to do when the alfa air intakes are in front! Here is a pic of my thrust test bed. Enter the values as described on the thrust tube page.Output values will be in the same units as you have entered them in.
This heavy-duty thrust measuring base is machined out of all aluminum for strength and rigidity.
F-86 is round to a rectangle then back to round at the fan, not so good. The thrust tube is an effective way to get the best performance out of an EDF. But I have no wheels !!!!
The intake on the Mig is far superior to the F-86s. EDFs use higher KV motors than most independent brushless out runners. The Dr. Mad Thrust EDF testing base is the ultimate tool for the jet jock.
Here's mine with an "adapter block" for EDF 40's and EDF 50's. I've seen one sight that addresses this. They draw a lot of power to spin those fans and only have a very narrow speed range where they’re at their prime. Jonathan, if you like to fool with computers, get the Medusa Power Analyzer Plus, with the cable link for your laptop and you can graph amps/volts/watts etc. Calculated Values include: Wing Loading, Performance Style, Stall Speed, Hand Launch Recommendation, Wattage per pound, performance style according to power.
It also means you can fly at a cruise using less throttle.
While the article above isn’t strictly correct as the air is not really “compressed” at these velocities, it is correct in that the area reduction along the tube increases the air velocity so that the momentum or thrust is higher at the tube exit. So how does narrowing the exit tube work?
I also need a whattmeter and I would be set. The proper way of measuring will result in repeatable measurements that anyone can compare against thiers if done the same way.
Weather has been bad, not much testing at all.
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I guesss I should get it done this weekend and sell something for a whattmeter.
I wanted to get some input from the many forum members who have given their time and knowledge to help others and to also say thanks for all that help!
receive periodic yet meaningful email contacts from us and us alone. Thanks to everyone who has posted so far! Electric Ducted Fan Jet Talk The Norm is 3s to 4s setups. Remember, the EDF motor can run at the rated amps while not producing the rated thrust. If you reduce the exit area, you increase the exit velocity, but loose thrust in the process.
As shown, the static has been reduced to about 17 oz.
9 thoughts on “ DIY Simple Motor Thrust Measuring Stand Station – Multicopter RC Brushless ” Steve 15th June 2020 at 6:28 pm.
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