Low Head Turbine Testing - Third Attempt 

The 90 degree bend makes no sense to me, unless the turbine is at the bottom of a large drop in height. That 90 degree bend is a huge restriction in speed from all that mass, while the whole system needs the speed from the mass of the water to be functional. And it looks as if such a small fan, or blade, or turbine, or whatever it is called, is not nearly sufficient enough to produce enough torque in order to produce any usable energy. But it was well worth the try though. Have you guys ever considered to use an impeller from a water jet or water scooter, or whatever it is called? Those are designed to move large amounts of water real fast, so I assume that a good flow of water can make an impeller move real fast with decent torque as well. It doesn't have to be a new one. Big thumbs up for doing these experiments, I like to watch them.

Your thumbnail game is improving rapidly

@14:37 Well the rock should have stuck to that spinning object according to the doctrine of gravity anyways, damn I guess there isn't any gravity after all and you just proved it lol.

Interesting to see how a scroll case type input will compare with the straight tube design. You will indeed get more of a square power increase with additional head, for the reasons you say; that doubling that also doubles the flow. Those load tester units are kinda cool, I've been using a washing soda variable liquid rheostat and two multimeters, which does essentially exactly the same thing but this is a bit more self contained. Looking them up on eBay tho they seem to be mains powered, how did you manage that by that river?

I've seen a video that has a cage around the entryway up to above the surface of the water to keep fish from going through the turbines. They used a tennis ball inside the cage on the surface that breaks the vortex. Unfortunately, i can't find the video again, but it's a good idea.

17:57 It's a DMPPT, a digital* maximum power point tracking. 😂 *Digitus is latin and means "finger".

Pretty sure you need a closed pipe with both ends immersed to get the max siphon effect. Just drop a tennis ball near the inlet and it will get sucked into and disrupt the vortex to keep air out. Also, tape the joints that aren't glued to exclude air from entering.

Congrats on the Baby! Awesome video as always

Congrats on the baby! Thank you for mentioning the Patreon, thats not something you do often enough. :D

Your job is amazing my friend

Congrats on the baby

I would guess the open tee and the loose joint onto the supply pipe, admit air on the inlet and the vertical outpipe being in the water is an obstruction to the free exhaust of the used water.

You should put the generator on the top of the suction pipe, it will be many times more powerful

Lol!! Just enough to compete with my blackberry USB charger adapter... But who cares!!! Free power!

Hi Joe, maybe you could try using a funnel at the beginning of the tube?

Word of advice to your friend... "low head" translates "large format". You're simply not going to make anything even remotely efficient with a 3" or 8" impeller for a low head application. You don't have the pressure required to make up for the density losses of something that small. As your flow closes on the axis, efficiency decreases dramatically. This is why pelton wheels focus on applying the force at the outermost cross-section. With low-head/low-pressure, you don't have the prerequisite pressure to drive such a small cross-section, so you need a design with more working volume. An archimedes screw type impeller is easy to fabricate... but the efficiency is still considerably low. On the flip side, they're low maintenance and can handle a broad range of flow, which is beneficial for these small streams that are subject to huge variations with runoff. As far as homebrew options go... there's no shame in taking a design note from the big guys. Check out GovDeals or some other place where you can find municipal slavage sales, and rob the impeller from a large scale centrifugal pump. Either way... messing around with turbocharger parts for low head applications is a huge waste of time and resources. Even the largest truck turbos have a throat less than 100mm. To find anything larger, you'd have to get into supremely expensive marine chargers... where even trashed salvage units can easily cost upwards of 6 or $7,000 just for the housing.

Pour stopper le vortex, j ai vu un système d un. Gars tout bête, il a fait un cylindre en grillage a l entrée tu tuyau d évacuation, qui depace le niveau d eau, puis a mis une ou 2 balles en plastique, dès qu'un vortex s amorçait, la balle était attirée par celui-ci, et stoppait le vortex comme vous l avez fait avec votre main 😉

I caught those subtle jokes. Good times. Looking forward to the next video with three times as much suck!

I'm looking at a river, to drive power you need to have a wheel with the water flowing underneath then if its wide enough & doesn't pic up rubbish I feel its the best to drive power, you probably need to consider narrowing the water flow to the wheel, anything like that is definitely not a play area for children because of the size of the wheel & power

Here is one for user engagement. Thanks? 😊

Do u sell the plastic kaplan turbines..??

observations. the only thing that does not suck in this turbine design is the pma.

New camera/lens? Your piece to camera at the start/end has some 👌 depth of field, I think your last video had it as well.

Try a wire produce rack from an old fridge and a tennis ball to kill the vortex

Sounds like the bearings are Rusty

Can you randomly tell me how much power in watts can i produce with a height of 20 feet and flow rate is 30 gallons per minute. The distance is long and i have planned to use a petrol generator's dynamo and make a pelton turbine for it.

On a low head system, where you have a large capacity of water, and not much head pressure, why not insert a unpowered tessla turbine above the generator. Tessla turbines will power themselves given the flow from the water. And increase volume and pressure.

775 is in my area

Next thing to do is fix the leaks in the blower housing. Looks like there's too much gap between the turbine blades and the outlet hole. For max efficiency in impeller pumps (like for PWCs) they run as tight of tolerances as possible. One company got that down to one or two thousandths of an inch with a plastic wear ring sandwiched between the pump housing halves.

With the t open at the bottom you are not getting the benefit of siphon effect, which is most of your power

5 volt 1ampere, c'est là que l'on se rend compte. Que même un tel consomme tant

why don't you try the super high tech vortex killer 🎾or⚽️balls

I have kids I love kids but I think his mom is calling him lol

Wouldn't be a risk of having cavitation downstream the turbine with such a high outflow pipe?

And then the rock dropped into the pipe shattered a few of the turbine fins.

the style of turbine you have been playing with for some time now is never going to give you the results you are looking for there is allwase going to be a lot of energy lost with any turbine try changing your thoughts to kineticenergy

Wonderful video of a child playing around ac voltage IN WATER!!! SOOOOOOOOOO SMART!!!!

Hello joe malovich i new friend from indonesia

Well that bucket certainly was a stupid mistake. Skip to 7:48 right after the bucket gets stuck to avoid wasting your time.

Thank the good lord for 'fast forward'.....

Keep that kid away from what you are doing, please, and let us concentrate more efficiently.

Isn't it dangerous to have that kid there? He seems very hyper and will touch anything. Never have kids around high voltage and turbines. He even touched the turbine.

Get a job......