Open source 12-15m high performance/semi-cruising catamaran design

Hi Groper,

Looking interesting, maybe you can use the boot stripe area to mount hinges for your pitch damping foils too- with a good spread on the hinges and a strut from the inboard gunnel, kind of like suspension wishbone mountings with the foil able to retract/hinge up to the inboard hull. If it don't work easy to chop off or use one set as a take off for inner fore stay bridle & not much interior interference such as with dagger cases and also easier to modify attitude geometry with the hinge bracketing to boards.
Jeff.

 

Can you draw it jeff? Finding it hard to visualize...

 

Rough & ready,
could have a spring & shocky too.. front hinge pin could be your dolphin strike fuse.
J.

 

here is a render

 

Yours would be bigger but, quite a nice video, Grainger design


... and nice read - Optimising Hull Lines for Performance https://www.graingerdesigns.net/the-lab/optimising-hull-lines-for-performance/

 

Interesting idea Jeff - no reason it wouldnt work... there is a problem with spray from the strut connection tho- that would blow back over the deck and be an annoyance...

Will have to statt making some calculations soon- ive been busy of late tho, need to determine foil size, loads, location, design evelope to name a few... anyone feel free to make a start

 

groper, can you post data file on the lines? .3ds, .dae, OR ..sti?

 

Which lines would you like- waterlines, buttock lines or sections?

 

Sections should do it. 50 cm intervals possible?

 

I hope DXF format is ok with you - seems to be more universal for 2d sections... 0.5m intervals as requested.

 

interesting -- was the model saved at a particular scale? Major hull panel dimensions are like 4-5cm according the edrawing measure tool.

 

Probably an export scaling error - multiply by 100 or 1000 and it will be correct. Ill check it shortly and see what happened

 

Nope - works fine for me in autocad. The units are ISO standard - therefore the dimensions of the lines are in METERS. If your software is set to millimeters, then scale by 1000.

 

umm, here is a screen shot of stn 9. The file has 20 stn plus grid and lines

 

in case its a drama - again scaled to mm this time