High-Speed Waveless Boat

[waveless]

Sorry, I have made mistake in my design, I have changed the design, take a look again.

Why no people point out my mistake?

[woodboat]

I think your design looks very similar to this
http://foxxaero.homestead.com/indrad_061.html

[kach22i]

Mistake?

I'm still trying to figure out what's changed, as I have no side-by-side to compare the change to. You don't make it easy for us.

Looks like you added a "Duct" label.

Did the propeller/engine location change in one of the schemes?

Hey, Woodboat, I think his design is more of a curved hydrofoil, but with zero lift.

The design seems to depend on water clinging to the hulls surface and the curve duct structure, and not separating, which is what good foils do, right?

I'm not big on the propeller in this design; the shroud or foil does not act as a flow feeder/controller to the thrust element (propeller). All I foresee is debris being directed into the blades with no chance of deflection or escape. What if you hit a floating log?

I think a cleaner thrust element would be water jets whose turbulence is evened out by the hull and neutral foil. There will be lots of friction loss, but lower disturbance than a free (open) system.

I've seen hydrofoils with curved foils, if you could level out the wake with pressurized air like a hovercraft at the stern you may be on to something new.

Keep working on it.

[waveless]

woodboat,

If you can read mechanical drawing then you will understand what waveless boat looks like.

[kach22i]

Just did a Google image search and found this. Does this look low wake? Would you really want to try to operate it in a shallow river?

Just food for thought.

[kach22i]

Does anyone know what a "A" foil desgn is?

Bugatti Design
http://www.******************/Bugatti...nced_Hulls.htm

The special foil design destroys the wave geometry passing through the A-foil, creating a flat water surface under the hull for a very smooth ride.

[IMG]http://www.******************/images/100ft_BUGATTI_YACHTS_Illuminations.jpg[/IMG]

[waveless]

kach22i,

A-Foil Motion Control System Hydrofoil
==============================
I think that A-Foil's screw is fixed at the tail of the boat, and it's bottom is not a duct. this why the wave is generated at the tail. She is not efficient, and the energy will diffuse to the open water. also it is difficulty to turn round.

[waveless]

I have a lot of unti-traditional designs, I feel that traditional design of airplane is very babyism. Because here is boat design forum, I do not talk about.

[Leo Lazauskas]

Originally Posted by waveless

woodboat,

If you can read mechanical drawing then you will understand what waveless boat looks like.

Hi again!
It is not clear to me how you estimated the resistance components in your original post.

What are the wetted surface areas of the ductless vessel and the waveless vessel?

What length are the vessels and what is their optimum speed?

Regards,
Leo.

[kach22i]

Waveless I don't want to talk past you, through you, or around you - I want to see Leo able to help you.

I need to talk out loud about the Bugatti design for a moment, as it has my interest for now. If I make a false assumption - please feel free to correct me.

"A" foil is just that, a foil that looks like an "A" in section or an upsidedown "Y".

This paticular Bugatti is built like a narrow sponson catamaran, with a tunnel like middle hull, which compresses air to the stern for lift and to level out the wake. The craft is very much like a SES (Surface Effect Ship), except there is no bow or sten skirt to contain the air under the craft body. The "A" foils attached to each sponson/pontoon near the bow and lift up the front of the boat/craft.

There is more "wetted area" on this design than a traditional hydrofoil, but I'll assume it's better in heavy seas and has greater payload.

How close did I get with my analysis?

Now that I did this, maybe I can tackle the design by "Waveless", I'll admit I need more and better drawings and a photo of the bathtub model. My imagination is not limitless, but even I could use a 3D view of this creation.

[waveless]

1,The resistance is related to section plane under water surface. for principle, waveless boat can reduce the front resistance to 0.

2.the wetted surface areas is about two time of the ductless vessel.

3.The boat length is no limit, and it's speed can't be very fast, keep the duct full of the water.

[waveless]

I am not possible to do the test, I only want to talk the principle with the experienced engineer and researcher.

Thank you to talk to me.

[waveless]

kach22i,

I am a good computer engineer, I will give you a 3D view. At moment, I have no 3D software in my computer. I will reinstall CAD software again.

Wait some time, because I have to finish something.

[Leo Lazauskas]

Originally Posted by waveless

I am not possible to do the test, I only want to talk the principle with the experienced engineer and researcher.

Thank you to talk to me.

My pleasure.

If the duct is about the same length as the vessel, then it seems to me that the vessel has almost three times (not two times) the wetted area of the ductless boat. You might be able to reduce wave-making using your method, and that is very good for some waterways. But I doubt that your vessel will be more efficient overall because of the large frictional resistance and the large form drag. In fact, you might end up with flow separation on the hull, the inside of the duct, and on the outside of the duct.

[waveless]

1,It is right 3 times.

2,Water is a good lubricant, the frictional resistance is very small.

3,If separat from the hull, it will not overcome the front resistance.