I am connected to the nature, air and water are my elements, this is for sure. From the early beginning making the boats models, then RC sailing and at the end my connection to the kitesurfing / www.seajump.com / Over last years I was flowing the Moth sailing class, which I find weary interesting! The whole story went so far, I was buy a Moth this spring! Yes Moth on hydrofoils come to my place late April.
Here it is first time on the lake!
Some nice sailing days I spent over the summer, but this crazy machine need 10-12knots wind to come up on the foils! The spe of the main foil and the tail is squere, this is bad hydrodynamic solution. I was looking already over summer to change and make new foils, doesn't happened true the lack of time!
Axeman 7 GBR 4067 on the foils, it was hard this day because the wind was strong in gusts up to 30knots, well to much for this boat!
The story for today writing is different. The decision was Axeman need new extensions on the foils. In vision to have more performance, less drag and earlier take of, I go for it!
In short, there was couple of steps to do. First find the foil sections, then use the CAD, in my case the www.Alibre.com!
Working n the foils sections and shape.
Solid was constructed on the 1/2 size of the foil.
On next steps some surface check was done with the mesh elements.
Logical step forward go to CAM, here is the first milling path,
and the finishing steps!
A quick jump to the lab, use Carbon fibre material, vacuum and we have first two extensions out of the mold. //OK OK, it is not so easy, but I am lazy to write!//
Like every piece done from Carbon fibers looks great!
Here they are finally assembled on the existing Axeman/Fast-craft hydrofoils
Don't ask me what is next step is ........ sure go to test them, the extensions! The only problem will be the air and the water temperatures on North Adria. Water have today around 15deg C and the air the same. Goal is to be on the water for next week, I hope I will make it!
In all I am still not sure if these extensions are just modifying of Axeman or it is beginning of designing the new Moth! I will see and post here what the future will show!
Next time some more design news!
Huge planks with even bigger fins, interesting enough to jump into and prepare my own design. One weary important point on the low wind and also on course kiting is perfect planing of the board and good hold of the fins. As everybody wish no sniping please. The board is "classical" shaped, the widths point is moved back from the middle, quite square tail and "big nose. Almost 1/2 of the rocker line must to be flat. This make the board good planing and speed. The rails are on front round and completely sharp /90deg/ from middle to tail! I decide to go with the top surface in 3D to get more ridged construction with less weight. On the tail I need flat zone to mount the fins on! The design of the board looks like this: 
Looks relay unofficial in CFK look with 3D top and veneer strap in the middle, even more difficult to understand are the side fins. But wait they are there for a reason. The middle fin will keep the position lite it is "state of the art" on the boards, the front fins are moved out of the board to be in clear waterfowl to get as much as possible track and force out of it. The end decision was done after all the analysis and comparison measurements. The fins shape are up to date the best of Aero and hydrodynamical calculations and yes they looks like fish fins, surprised, me not!
Bottom flat part of the board! 
And for the end the whole shape in one top view! 
I was not mention before, the whole board and everything else is drawn into CAD parametrically, used the latest SW technology and calculations. The core of the board was milled out of foam core with CNC machine, on this point is no comparison any more with hand work and precision! The decision was right! 
The board will be laminated in the rocker table in next days, so keep this space for future news! Then on the water to push this stick to the limit! Looking forward and I will be back!
The story for today writing is different. The decision was Axeman need new extensions on the foils. In vision to have more performance, less drag and earlier take of, I go for it!
In short, there was couple of steps to do. First find the foil sections, then use the CAD, in my case the www.Alibre.com!
Working n the foils sections and shape.
Solid was constructed on the 1/2 size of the foil.
On next steps some surface check was done with the mesh elements.
Logical step forward go to CAM, here is the first milling path,
and the finishing steps!
A quick jump to the lab, use Carbon fibre material, vacuum and we have first two extensions out of the mold. //OK OK, it is not so easy, but I am lazy to write!//
Like every piece done from Carbon fibers looks great!
Here they are finally assembled on the existing Axeman/Fast-craft hydrofoils
Don't ask me what is next step is ........ sure go to test them, the extensions! The only problem will be the air and the water temperatures on North Adria. Water have today around 15deg C and the air the same. Goal is to be on the water for next week, I hope I will make it!
In all I am still not sure if these extensions are just modifying of Axeman or it is beginning of designing the new Moth! I will see and post here what the future will show!
Next time some more design news!
