Pink one was cavitating. That's why it wasn't doing much and making that "rock crusher" noise. Can't really draw much suction against a vapor bubble. That also indicates it's going too fast for that impeller design. As far as testing otherwise, might be interesting to see what kind of head column the different pumps could produce. (The ability to increase pressure or pumping vertically up a tall pipe.) There are more factors in regards to pumping effectiveness than maximum flow rate. Thus in different applications the slower design for this test may still come out as being more favorable.

You should also check how much pressure each generates by having them pump into the hose going straight up and measure the distance.

Interesting! Suggestions for another test: Measurement of Rpm, amperage, pressure .

A static pressure test would help show why we have different blade designs.

This was interesting. Changing the battery mid test could skew the results, I suggest a more reliable power supply. Changing the design of the inlet face and size could improve the ability of the impeller to direct the flow. The inlet face seems overly open.

The grey one has low volume but high pressure, while the green and blue ones are a designs for low pressure at high volume! The pink one is medium pressure at medium volume. With tangential wings you need more blades.

Pink impeller looked and sounded like it was cavitating.

Heck yes. About time for a printing video. Haven't seen one in hours. Thanks!!

I made a gold dredge pump many years ago. same as the green one. i can add it had great pressure and volume, both needed in getting a gold dredge to work. Thanks for the video.

the curved blades reduce the output but increase the pressure so if you put the canister on >2 meters high you should see more

Your turbine tests were quite comprehensive. Great insight indeed.

This is what makes 3D-Printing awesome.

Good to see someone else uses a 0.8mm extruder, and an excellent video too btw.

something about building something that just shoots out water and wasting water is so satisfying

excellent test and video .. 40 years ago I had a cooling issue on my four stroke powered R/C model helicopters . . I conducted similar tests to yours . only using air .. not water . The biggest breakthrough was when I faced the cooling fan backwards and sucked the air PAST the motors crankcase prior to directing the airflow over the upper finned half of the motor . There is a two way spin off .. bigger fan equals more airflow .. BUT bigger fans take a lot of power , an amazing amount of power to drive at the 7,500 rpm motor power delivery.

-Make a testing rig having constant head at suction... - try experiment with both CW and CCW rotation of curved vanes. - do another experiment to measure the static head at outlet of each impler.

This is a cool idea . But you should test the pressure each impeller makes because I think curved blades increase pressure and decrease volume also angled blades do that too I think

I maybe can explain, why gray and pink is less efficient: These pumps rely on centrifugal force, so they pump by pushing the water/air/whatever u pump to the outside. As soon as the blades are curved the motion of the pumped fluid/gas to the outside is disturbed. And these disturbances have the effect of lower efficiency (because every disturbance of the motion of the pumped liquid/gas is an energy loss) Sorry if my eng isn't this flawless, i'm actually from germany ... :)

Very interesting your test, I never imagined that the green turbine would have good results, congratulations and thanks. Leandro Wagner.

This video production is quite simple and nice to watch.

I dont care about water pumps or 3d printing but i watched every second of this video, super interesting

I love the way you made demo.

when blades are curved rotation of the motor should be so that the blades bush water outwards. Your rotation is like pulling water from outside in.

Very nice designs. What would really be a good comparison is also to measure the watts each one pulls. (Volts X amps). Good job.

Interesting build. And well done video. I want to give some background information about pumps, as i have designed and tested industrial pumps as an engineer. In general there are three important variables you should measure while testing the pump. The first is the Flow. This is the volume divided by the time, which you essentially measured. The second is the Head of the pump. This is essentially a measurement for the pressure the pump provides. Measuring this can be done in an diy environment by connecting a hose to the discharge side of the pump and measuring the hight, which the pump can increase the water level in the hose to, while the hose is facing upwards vertically. importantefficiency. The efficiency of the pump is defined as (hydraulic Power output)/(Mechanical Power input). For your purpose measuring the Input of electrical Power would be sufficient, as the electrical motor has roughly the same efficiency in all cases. With these three simple measurements you could truly classify your impellers and rate them against each other. This is important as an impeller with straight blades will give you a higher output in pressure, but will worsen your efficiency. That's the reason, why they used straight blades in the case of the car pump. Changing the blades from straight to curved on the small pump won't change the overall efficiency of the car, but will increase manufacturing costs quite a lot. It could be, that your 6 bladed curved impeller will give you a worse Flow and Head, but will do so at an higher efficiency. My guess regarding the bad performance of the red impeller is, that cut blades in the centre will drastically worsen the flow and will induce cavities, which lead to an overall lacking performance and can damage the pump in some cases. It would be awesome to see how your pump and impellers perform overall, especially regarding efficiency.

You should also test it with the Lilly impeller design which is also used for wind turbines it is based on Schauberger design

The first and the last are the most efficient when it comes to pressurizing distance, these two models that I mentioned are used in centrifugal pumps. A primeira e a última são as mais eficientes quando o assunto é distância de pressurização, esses dois modelos que eu citei, são usadas em bombas centrífugas.

It would be interesting to record the impeller r.p.m and the outlet pressure. Great vid Sir!

1:52 "water bump buddy" great water bump test.

The curved ones were probably more efficient, but the other ones drew more power from the motor so they pumped faster. You have to test the power used by the motor to properly compare the efficiency

You didn't insure that the battery voltage wasn't dropping which would slow the pump motor, I agree that a pressure comparison would also help in determining most efficient impeller. Nice work..

Brilliant video, thank you for sharing.

Amazing stuff - well done. I learned a lot as well. Thanks

when looking at pump efficiency you will need to chart the power vs head over the whole range. one pump might perform better at a certain load point but worse at another. you can look how it is done, Google pump curve.

It's right this way, first straight turbine blades convert more energy in speed, the others are more suitable for low speed and high pressure. Results are correct

Very great video. Really appreciate your channel. Keep up the great work brother!

Did you measure wattage consumed? It would be interesting to track how the wattage and load on the motor changes in relation to the amount of water moved. There's a case to be made for a pump that moves less water while reducing load on the motor. Kinda like F1 racecar motors, going fast for just a few laps is one thing, commuting as a daily driver is a whole other use-case. Still, NICE VIDEO, thanks!

green - blue test confirmed 👍 ok back to my project watching more youtube :)

Interesting and also useful at the same time

The coolest narration ever 👍👍👍❤️

oh man i really love your accent its so cool dude!!!

Cavitation on sharp edges are stronger, so the curved blades will last longer I think....

you should try making a pump curve for each of these to see how they perform at different pressures

It'd be interesting to further test different curve angles for the impellers

turbine designs not only for amount of water also for pressure, how high the water-pump pumps water.nice job bro.

I printed and checked. Works great!!!

I hope you charged the battery for each test. And please do more tests for pressure as well.

Damn this was interesting!!! Thanks for that info!

Good day, I think a simple test whereby the static head in meters is measured and converted to kPa or bar. Simply place the pumps on the ground and see how high above the ground level, in m, the pump discharges the liquid. You can use this pressure and flow rates to actually determine the efficiency as (Pout/Pin) as flow rate is not really a good measure of efficiency, it's just a measure of flow rate. But still a cool video, keep it up!

Redo the test with the 5L container at a height of 2 meters and check flow again, this will give you a good indication of pump pressure. Some designs of impeller are better for flow others for pressure.

But the gray one is most powerful one because pumping 'torque' is higher than others. It is like a 'car tyre air pump'. It can be used if you use it for pump *well water* from the deep of 'well'.

Your channel is epic!! Love it

More this kind of useful video. Like wind turbine different Method. Vertical etc. Best type of anything like this Pump and We could Learn from the resoult

pumps has another very important property next to the volumetric flow rate, that is the outlet pressure. You can't judge a pump without knowing all parameters. There are pumps with low flow rate but high pressure, and oppositely some of them can have very high flow rate but low pressure.

Great experiment !

In my opinion, due to the fact that the pipe is installed on the pump in a tangential way the straight blades were more effective in compressing water in a tangent direction. The concave blades create forces on the water towards the center of the pump and not in a direction tangent to it so less water is compressed into the pipe and from there into the bottle.

Ooh a helical (lily) impeller would've been a great one to try.

Very good way to make the mini water pump bursts fast

Giving me ideas on how to automate my kitchen garden irrigation system

The video is 100% real even I tested the same thing after 3d printing the different turbines and I also made sure about the polarity of the motor . ONE INTERESTING THING I FOUND OUT WAS THAT THE RED TURBINE OR THE LEAST EFFECTIVE TURBINE WORKED WAY BETTER WHEN SPUN IN OPPOSITE SIDE.

Hi it would have been awesome if you also compared how those impellers performed on different hight I feel the pink one would have the highest head

I think that, if you switch the terminals of the battery you will obtain extremely different results, but you should change with it the input and output of pipes, or/ you can print a new screws of same shape, but of different direction.

Thank you, this is very useful information

Crazy I watched this vid a while ago and I didn’t realize it was you haha I just remembered watching something similar and it was already liked

Maybe is should be in reverse? Also I would be interested in the efficency and longevity

Nice background music this is my callertune

This is bringing back nightmares. I have worked on BMWS for 30+ years and from 1991-1996 they used plastic impeller water pumps. There’s a service bulletin about it. Every customer with an effected car I urged them to change the pump before it exploded or quit spinning because it stripped the shaft from the impeller. All replacement water pumps had metal impellers. When they blew you really need to get every last piece so you can rebuild it to make sure you removed the debris. It was put together to make sure everything was out of the engine. If you didn’t you ran the risk of a piece clogging a coolant passage and blowing the engine. Running a engine hot is the #1 cause of engine death. 80+% I have put in was due to a overheating issue where the owner drove it until the engine stopped because it locked up. If you cut it off when it starts tow it and fix it you can save a lot of money.

Im just looking for this , finally thanks

This video I love the most among all my tutorial videos.

I basically understand curved veins gives you a higher head pressure and lower flow rate and radial or straight veins gives you higher flow rate but lower head pressure if I recall my three or four semesters of fluid mechanics during mechanical engineering

it was a real plessure to see your video, keep going

The Pink and Grey impellors are typically used/optimized for involute pump housings, just FYI

I come need on another of your videos about curved fins I stand corrected. Thank you! Can you do a test to show how the final shape of the impellers of each of these affects the pressure that the impellers can produce?

i agree the pressure would be great. how many meters of tube can you press water in when placed vertically

Very professional thank you

Please print these designs in their mirror images (opposite parity). The ones you printed are for counter clockwise spin and the outlet on your housing is for clockwise spin.

Thanks for this info

You’re likely getting cavitation on all of them but I didn’t have to see the test to know the grey and pink ones with those longer vanes would be slower than the blue and green. If you could seal your pump housing and provide an inlet and outlet what we do on flow benches testing fuel pumps is put a clear piece on the inlet side so you can see the cavitation also different RPMs have different flow rates with a cavitating pump And really great video sorry forgot to be complementary!

Thank you for inspiration :)

Make a test comparing how high they can lift water (water column)

I think curved blades would perform better with a tight housing design i.e., less clearance between the blades and the wall of housing, although the flat blades might benefit from this as well. Flat blades throw the water outward better where the curved ones energy is dissipated by allowing the water a smoother path around the blade.

The results are ENTIRELY predictable, but they have nothing to do with "efficiency". Measuring the different pressure created by each rotor at several flow rates would give a clearer result. Monitoring the current draw of the motor at the same time would be even better. It will be found that the rear-angled rotors (all of them except the blue rotor) create less flow when there is restriction to flow _on the output,_ but they also draw less power then. If the motor and battery are strong enough, mirror-image versions of those 3 rotors will pump MORE than the blue rotor, AND put more load on the motor. All perfectly standard stuff from Pump Theory.

There are two main parameters to consider when dealing with pumps, the head, or H; and the flow rate, Q. Depending on the specific need or requirement. If you need to transfer liquid from a low to a very high elevation, pump designs provide the objective, with a high head but low flow rate. And, if you need a significant amount of flow, radial type pumps usually deliver a high flow rate but can only reach low to average head. Thus, depending on the specific requirement, the efficiency of pumps is measured. I suggest measuring the head of each type/design of impeller to know the relationship between the head and the flow rate of each design. Hope this helps, thanks.

Only use blue impellers from now on.. 😇

How about static pressure from the different designs? In other words how high of a water column they can hold up. Would be very interesting!

thanks for your information bro... be success 👍👍

Wow I’m amazed. I would expect the pink one to pump more water since the fins were curved but the blue and green did best, why??? 🧐🤨 very interesting results.

Nice test good to know

I found this very interesting. I build automotive waterpumps. The boss thinks your pink one is the best to use, he is the boss after all, LOL.

Hi thank for your efforts I think you should do similar build and test for different viscosity liquids and compare too like oil, water etc

Отличный тест, спасибо!

Interesting test! In order to validate your tests, you should do at least 3 test with each and present the mean and variance. This way it is much clearer what the average case will be as there are a lot of uncertainties in your setup

I think your pump housing may have an inefficient shape. If you look at some dust collector custom builds (Matthias Wandel and Marius Hornberger come to mind) you can see that they build the pump shape with an increasing gap between the impeller and the pump housing wall. It starts off very narrow near the outlet, and then grows bigger until it reaches the outlet, where it usually is the same size as the outlet. This would probably improve the efficiency of the red and grey impeller massively, since now you're purely relying on the blades kicking the water out, instead of building pressure inside the pump, and having that pressure push the water out.

Hello friend. Thanks for posting the video. Four impeller designs gave You different results in water flow but be sure that the pressure the pump could reach with each of them also differs. For the pink one, I gues the inlet was close to the bottom or the pump was taking air. For the pressure, I expect the highest pressure from the grey one.

The Grey one is good for getting elektricity out of water

Nice water bumbs

Buen trabajo, esto sirve mucho para una clase de diseño y fluidos.

i loved your voice tone and videoo tooo

You just gave me the idea to make electronic turbocharger for my mini four stroke engine

I really admire your patient on doing this, but actually all pumps need a Q-H curve to be properly described.. for example the gray one is surely able to give an higher pressure than the green/blue ones. And if the 5L bottle was some meters higher the winner would have been the grey or red✌🏻