3D Printed Harrier Pegasus Jet Engine | Vector Nozzle Thrust Test
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- Опубликовано: 13 сен 2024
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Absolutely perfect realisation great respect!! For redirecting EDF thrust I did some tests many years ago. Most of the thrust loss happens at the "2" times 90 degrees inside the nozzle. This creates vortices due to centrifugal force and the airflow flowing faster in the outer curve. Up to 30% is lost each per 90 degrees. One could divide the airflow into more than 3 parts by means of good airfoil inside in order to still gain something. In the real Harrier, there is a higher proportion of pressure in relation to airflow, therefore very little loss. The larger the EDF and the more blades also increases the pressure share.
Cool thanks man👍👍
Hello,
You made identical nozzles on the front and back, but the nozzles on the original aircraft are not the same. The front nozzles are rectangular in shape and have a longer length after the 90 ° bend, which in my opinion projects the throttle parallel to the fuselage, unlike the rear nozzles. In addition, the front nozzles are farther from the fuselage than the rear nozzles, which prevents the front air flow from bouncing off the rear nozzles. Add to this that there are no fairings on the nozzles in your test. I think all this contributes to causing disruption and therefore losses. Good continuation in your construction.
We are working on it💪💪
Awesome job!!! Following all of your steps !!! To soon start my vtol proyect ! Thanks Rene !
Yeah do it man🤙🤙😁
The 3D printed construction of duct looks extremely professional, very good job!
Thx mate 💪😁
Awesome!!!!
Harrier power💪💪
I'm gustavo from medellin, thanks
HI René, thank you for this very informative vid. All your vids are worth watching. Just a friendly remark: I was using the same 7-in-1 meter like you use and it took me a while to find out that it's limited to 100A. So basically most of the power tests of my 80-90mm EDF planes resulted in 'around 90A' numbers, but in reality some were 120-130A I found out with a different 150A specced meter. Maybe worth checking your's. Greetings from Belgium!
Thx mate! I'll check that👍👍
Geil gemacht! Weiter so….
Please show us how complex surface (fuselages)vacuum bagging is done. I always end with glass or foam being bridged in some corners. Waiting your tips.
Hi, Nice video and test. I want to suggest some test. In order to differentiate where the loses come it will be enlightening to test all parts of the duct alone. For example stablish a baseline with an edf 70 and thrust tube then add one of the nozzles , the difference will be easily measured.
Without nozzles side thrust can be measured just by rotating the bifurcated exhaust in the test apparatus.
The setup seems pretty constrained with the bifurcation and hard bends, If nozzles end being not that bad, I think 2 smaller edf directly atacched to the nozzes will be more efficient even in cruise mode if the intakes are fitted with large enough lip radius, I'm a firm believer in edf without intake ducts.
By the way there is a lot of intake and exhaust manifold design literature.
In such a complex setup water column manometers will be a great and cheap tool to measure where a duct needs to be enlarged or reduced.
Good luck with the project!
Thank you very much for that comment! Caused by the scale needs there can not be made that modifications... It should look like a harrier at the end. We will figure out the best compromise😊👍👍
@@renerosentraeger I mean to put the 4edf inside the plane but in a spanwise position to shorten the exit path. Totally scalish
This is great work!! Your gonna have to 3D print a much bigger fan like on the real Harrier that will produce enough power for all 4 nozzles....
You should keep cross section larger until the end of path, to minimise looses, by lowering speed of air and rising the pressure. You raised the speed of air too early by lowering cross section area behind edf...Keep speed low and pressure high, until air passes all 90 degree opstructions...
Very good 👍👍