Three Point Hydroplane Questions

Any more tips???

Still wondering how tunnels achieves the 3 degrees of planning? Having difficulty picturing that..

 

Not 3 degrees of planing. 3 degrees angle on the underside of the sponsons. This is the best compromise between low hydrodynamic drag and reaction to waves.

 

This water speed record boat had 7 degrees angle on the bottom of the sponsons. Notice the violent reaction to waves.

 

Bricks dont fly well at speed !!

The main body could actually have shape on the underside to use Surfaceeffect . The upper and top surfaces need to be aerodynamic designed to make it fly and have the least amount of wind drag possible
I am a pencil and paper designer and wish i could do cad drawings . but finding the right buttons to push is time wasting .
Two minites One line with a pencil and 2 hours on the computer by the time i got the line i forgotten what it was for My boat designer friend in nz we come from the same era and understand each other perfctly .
The wall in his drawing office has a board 25 feet long and 8 feet tall . all mdf board white Paintedand we even open the window on the other side and go stand in his drive for a wide veiw . Never fails and almost never have to re-draw anything its all done by eye . measurments never have to be checked and can lofted directly on to the plywood sheet and go cut and plane the last mil and everything fits

Models the same make a drawing board on the wall and draw the exact size of the boat and stand back and look.

 

Hand drawing helps develop a mental map of how objects relate to each other and is a more powerful design tool than most people can imagine.

 

that was never going to do much thats for sure !!

You want to see boats that fly look in the scream and fly picture galley They have the most fantastic collection of boats on the limit !

You people are missing the point !! it wants to barely touch the water ,part of the propeller adn the rudder and maybe a side fin the rest need to be flying in surface effect do you understand what it is and how it works ?? search the net read and understand ,That here its all at !!

 

Now this is worth reading

http://www.ehow.com/about_5241839_ground-effects-aerodynamics.html

 

^^Referring to the deadrise or the position of the whole hull on the water?

How do I know how much curve to put on the underside of the sponsons and engine carrier? Would each work being flat on top?

 

Cool, now I have something to read tomorrow.

 

origami and paper planes

I had the pleasure of working with a brilliant boat designer lady in south korea while i was there . Su Jung Lee was lightning fast on auto cad and could also draw pencel and paper as well . she was a stimulating person to work with and if we had an idea of something she had the ablility to instantly put it all in paper and then cad just as quick .
I wanted to introduce origami make and fold and unfold panels for the inside of a boat ,we only had the space of the companionway to get it through folded and then place and unfold inside the boat , Su jung got up part way through the meeting and in less time it took me to go to the toilet and back she called me to have a look at the computer screen and it was all there complete even the sequance of fold place and unfold inside the boat . This method saved many hours of making fixing , had coved corners etc etc
The panel had a smooth gelcoated face from end to end with internal and external radiused corners all the same finish it incuded galley fronts and bunk fronts plus a bulkhead face and finished against a shower wall that was another bulk head , All glassing was done from behind to fix in place and corners recieved there final layers of glass so they were strong as any other panel

 

you want to make it go you got to make it fly !! GET IT OFF THE WATER !!!!

You havent been reading about aerodynamics have you !!
If you have you not taking any notice of what you reading !!
Untill you grasp the aero thing you just going to go round and round and round !!and get nowhere .
How does a wing shape produce lift ??
is it the bottom of the wing or the top that makes it lift ??

 

Been reading today, actually found some good information.

The top and bottom of the wing creates lift. The top should have a bulge, and the bottom flat, to gain lift. Let me know what you think about the design below. Might be interested in a 4 point hydro.

How do I know how much to bulge on top of the wing? Any info on angle of attack??

 

here is some reading....

"Aerodynamics in Powerboat Design"

 

Forget what you got its the brick with one rounded end and start with a fresh sheet of paper .
Jimboat has chimed in at last !! and is possible the most knowledgable person you will meet on this very subject . Find a wing section RAF 32 and that is your wing shape to design you boat around draw the wing to the size of your boat then superimpose the boat around it there are percentages of the cord thickness that can be reduced so its not as fat from top to bottom !!! read and completely understand what the wing is all about , The bulg and the angle of attach will all answer themselves the information will be all right in front of you look !! open you eyes and expsand you mind a little and really see whats there .
Believe me once you get used to that shape it grows on you . and it will fly !!for real !!
The small tunnel boats i did looked really nice and futuristic looking but all design was completely based on this wing section as its efficetcy match the speed range that the boat would be working in most of the time . The sponsons the same ,Remember the underside is boat, but its boat only to the point till it needs to fly !! so first you need Hydrodynamics to get the thing up and going then very quickly Aero dynamics take over from there to make it fly in STABLE FLIGHT !!!So no open holes with engines sticking out of the top , has to be a pod tear drop shaped pod !!
I feel like i am going no where !! do you comprehend what you need to be doing ?? look at what others have done !!,they just doing what everyone else is doing they just folloing eachother no one is taking a step back and looking beyond where others have got to and saying this is where i want to go !! i want to be number one and i dare to step outside the box and take a giant step forward , i have the basics and i know where they all at but i want more and not just a little more but a lot more !!
You want to see something exciting have a look on this sight at the moth sail boats on foils that is thinking that is beyond it !!

 

Been reading today, actually found some good information.

The top and bottom of the wing creates lift. The top should have a bulge, and the bottom flat, to gain lift.

There a lot more to what you just written than you have taken in . The bulge you call it is the cord of the wing its shape and possition is critiacal the nose shape the same ! its not just done to sort of look nice !!, every shape and curve is done for a reason .




Let me know what you think about the design below.
the shape below nneeds to be in hydrodynamics so its a boat !! the step thing you wanted to know about in the begining is almost a nothing ,its just a step very small and possibly hardly even noticeable . its just to reduce wetted area and will get you on the plane quicker but almost instantly its going to be into aerodynamics and flying with just a part of the propellor and the rudder with a water pick up at the bottom down the trailing edge and a very strong strut blade down in to the water somewhere positioned along the side of the pontoons to hold the hull in a straight line the rest of the boat should be completely clear fot the waters surface . do you grasp all this it needs to fly !!! The only drag is the bits in the water and the wind drag from pushing the boat shped like a plane through the air . if you can get you head into all this then i hope you have a long shelf to put all your trophys on !

Now i must get back to work !! in the real world !!





Might be interested in a 4 point hydro.

How do I know how much to bulge on top of the wing? Any info on angle of attack??