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 … Well, by narrowing the exit diameter, the air is compressed more by the fan and is forced out of the exhaust faster. So how does narrowing the exit tube work? I dont have a pic of it. Started, Advertising & I typically use a med-high power setup that gives slightly over 1:1 installed thrust. Thanks to everyone who has posted so far!
This article will inform you! The rods are set far enough apart to where I can run a 14" prop. … Here is a thrust tube calculator for working out the size of your EDF tube. Holes in the base allow you to attach it to your workbench to prevent the fan from taking off across the room during testing. Reason, more leakage of air out the front due to higher static pressure.
Electric Ducted Fan Jet Talk
All rights reserved. So you are essentially fooling yourself with this measuring system. I still have to crack the seal on my turbine Skymaster F-18 project for the summer. If you reduce the exit area, you increase the exit velocity, but loose thrust in the process. The intake on the Mig is far superior to the F-86s. Works fine for brushless motors. If you want to know more about ducted fans, read this article about building, tuning and flying EDFs to expand your knowledge.
At a fast cruise, an EDF powered plane is in its element. Having said all this, ensuring that the inlet to the EDF is unobstructed is way more important than anything that happens at the outlet. As shown, the static has been reduced to about 17 oz. 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. https://www.rcgroups.com/forums/show...=271490&page=1, https://www.rcgroups.com/forums/showthread.php?t=252722, https://www.rcgroups.com/forums/show...t=Thrust+stand, The following errors occurred with your submission. To get the most out of an EDF, you’re going to need an intake ring and a thrust tube to take in and accelerate the air optimally. Dammit Jonathan, you can make a stand like mine in less than an hour for $5 in materials - get to it! The Case diameter will always be larger than the Hub Diameter.
or I started putting together my other slimmer warbirds and a new KMP 72" Spitfire for E conversion.
.... For example, my the static thrust of my F9F measured about 22 oz with an unrestricted inlet and full outlet ducting. Enter Wing Area, (sq in) The exhaust duct is slightly tapered on the F-86, but it ends inside the jet! Controlling the airflow into and out of an EDF unit is important for getting the blades working at their most efficient speed range and maximizing the performance of your RC airplane. This tells me the inlet ducting is restricting the air flow. Where Power goes when Brakes are Applied on an RC? As well, this may only apply to actual jet turbines, but your inlet diameter can cause or help in overloading the fan. A 20mm diameter motor is the most common size for a 64mm edf unit. YouTube Channel: www.youtube.com/projectairaviation, - Find this article & others like it at www.FliteTest.com -, By joining our mailing list via the home page or during checkout, you agree to Measuring thrust with the exhaust focussed at the scale is not a valid measurement as there is a pressure component that the face of the scale adds to the physics equation that is not present in the air during the launch and flying. The following errors occurred with your submission. For the length, a thrust tube should be around 4x longer than the fan diameter.
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