Coanda effect saucer first test

[Sylvanian1000]

It's much more easy to built a heli or a jet plane.

[snappyboy1]

hi looks like you are you are using a small motor and prop... you must have achieved a high thrust to lift ratio. i used to use shop vacuum motors and impellers and had extreme torque/spin problems and never achieved useful results like you have. this is a very important effect and you have done it very well. thanks

[camagueyano38]

otro que no le volo la lampara.....

[Curicua]

what is a Coanda effect? someone explain

[GRATZIANI2002]

looks like u spend time and money for this failure...Coanda eff does not act like there...

[Meneer72]

@GRATZIANI2002

Hello Gratziani,

Enlighten me then. How does it work if it doesn´t work like this?

With regards,

[GRATZIANI2002]

@Meneer72 if u talk about Coanda , first check the thrust without "saucer"..meaning only engine with propeller ...second, verify thrust with the saucer..let the stability latter...

[wowonice1]

yer, uh, pullin a little left there, sir.

[Meneer72]

@wowonice1

Depends on what you see as front here :)

[faunflynn]

Is this like the ground effect used by the Russians but applied differently ?

[Meneer72]

@faunflynn

I think it is an entirely different effect. Coanda effect is that of a liquid or gas sticking to a surface. Ground effect is more something like a pressure build up underneath your wings because you are in close proximity to the ground. Accompanied by a reduction in drag.

[jreagleman]

What it's doing is pulling air down and over the curved upper surface. Due to the Coanda effect the air sticks to the surface and picks up speed as it follows the contours of surface area flowing down. This increase in speed accompanied by a decrease in pressure produces lift....just like an airplane wing.

[KDEngineering]

Try some Viagra

That should help you get it up

Haha

[inagod]

needs refinement,power seems to be way to low.

[FridaySternShow]

the bulk of that monstrosity you have attached to that nice top piece is too heavy. im sure you figured that out.

[Meneer72]

@FridaySternShow

I took one giro out. That was a lot heavier. You know the density of Depron? And of air. Which takes up about 60% of the volume of the monstrosity. Besides that in the Depron foam of course.

But please answer me one question. Why, did Jean-Louis Naudin move his battery, the heaviest part of the saucer, from the bottom to the top to make it fly better?

[EducateYourselfOrg]

Ik ben nu ook bezig met een coanda saucer. Maar vandaag probeerde ik de motor te testen. Lithium batterij opgeladen, stekkertjes van motor aangesloten op kleur. Van de 6 channels receiver zat de batterij gewoon op B en dat andere stekkertje in 1. maar hij brande helemaal door. enig idee waarom ??

[Meneer72]

@EducateYourselfOrg

Geen flauw idee.

1. Wat brandde door? De motor, de regelaar of de ontvanger? Ik neem aan de motor.

2. Heb je de lithiumbatterij op de regelaar aangesloten? Klinkt hier alsof je de batterij op de ontvanger aangesloten hebt. Of had je twee batterijen?

[EducateYourselfOrg]

@Meneer72 De regelaar brandde door, maar het is al gefixed. Hij brandde door omdat we een stekkertje verkeerd hadden aangesloten dus kreeg de regelaar teveel stroom

[FilmBorne]

yeah moller, ufo hoax did tried to create real UFO.

[smorris96804]

it's nothing to do with the coanda effect. it's just a hovercraft!

[Meneer72]

Hmm, very bad design for a hovercraft. No air from the propellor is going into the hull. Only over it.

[raunchbear]

Fail, and the Coanda effect is bullshit

[Meneer72]

So if it doesn´t fail it is no bullshit?

[feliztex]

With precisely that same design, simply use a turbine like the one on this video: watch?v=vb0LLHLi7bs

Then make another video and show it here. Greetings.

[AuroraCypher]

Hey did u copy this design because i swear ive seen it somewhere? i was thinking of making something like this looks pretty easy to make. I think...

[Meneer72]

Yep I did copy this design. See comment added to this video;"This Coanda effect saucer is build by the design of Jean-Louis Naudin of JLNlabs." :)

If you have made things like modelairplanes it isn´t hard to build.

Getting it to fly might be a bit more tricky. Mine still doesn´t really fly.

[AuroraCypher]

could be under power ?

nevertheless great work !

cheers !

[trikovich]

Hi, any luck so far? remember - all the weight of the motor - prop - radio gear is at or above the lifting surfaces so the design is top heavy. This is why it tips up. either lower the battery as much as possible or add a gyroscopic fan, like mine. Mine worked perfectly with a fan and a heading hold gyro. motor burned out tho so no footage.

[Meneer72]

No, didn't get any further yet. Haven't had much time and to many projects. It just hasn't got enough power. I'm still planning to add an extra counterrotating motor with a 10x5 propellor. So it get's more airflow and rotational stability.

I want to test it first on this design and then make a 20% bigger one.

[Meneer72]

I still think that with the higher center of gravity the frame will react quicker on it's rudders. It is like balancing a weight on a long or a short stick. If the underside is light. With only little effort you can keep it straight underneath the motor and battery. If is has to move the battery as well, reaction time becomes much slower and it can overshoot. I think that is why JLN moved his battery up and got better results.

[trikovich]

If the weight (battery) is lower then there would be no tipping, so the flaps wouldn't NEED to react quickly to counter it.... i've not seen anyone make a controllable version using a propeller and i think naudin is simply a skilled r/c helo pilot (thus the illusion of stable controlled flight)

Either way, it's interesting

[iorixs]

so do you get more lift than if you used it like a helicopter principle?

[Meneer72]

As far as I know, not. But it is funny that it can fly. :)

[uber2ber]

flying foot hassock, cool

[inventhead]

an electrolux motor would had better thrust i tested early ones n recondition them at 110 psi vac thrust and u can reverse it to however a battery wont be to good unless lithium or peroxide type and a power inverter to make 120 ac and upscale what u have

[trikovich]

what?!

[123MATTYABC]

whats the voltage on your battery

[Meneer72]

It´s a 3s 1p LiPo battery

or 11,1V 2100 mAh battery

But to be honest the whole thing is a bit underpowered. With a 250W 1500kv motor and 9x6propellor it only really flies a couple of minuts. After that there is to little power.

[fallingwater]

I'm not at all versed in aerodynamics, so pardon me if this question is a bit dumb, but: why not punch a hole straight under the propeller, put another propeller in a coaxial fashion (to cancel torque and provide rotation), and have the flyer work by simple thrust? Unless it's explicitly a study of the coanda effect, it'd seem like a rather more efficient way to run a flyer.

[skategast133]

Dutchies!

[leviterande]

coanda saucers aint easy but fun as hell

[trikovich]

Hi, Nice UAV! are you a member of the Yahoo GFS UAV forum (setup by Naudin) ? I'm glad to see a new attempt, if you have or need any information send me a message