Here is another thought on seats...
While away on a strenuous business trip I tried checking out seat angles for landyacht seats.
My personal preference was for position "2" although position "1" would be ok for minium air resistance.



Then taking the contruction ideas from "iand" on seabreeze and the construction of one of my previous yachts "Wildfire" the construction of a landyacht seat could be made from thick cardboard of approx 6mm, then coated all over with fiberglass and resin making a very solid seat.
Contacting a box manufacturing company the cost of 2 sheets of card board came to about $3 each ($6 for the seat)

Have a try at printing this picture and getting the scissors out and see what you come up with......



Folding along the lines you might end up with a model like this .......

Gizmo
Couple of photos of the seat I used to get the seating angle(it's my dog's bed) I ended up having someone support the back of the chair lifting it up and down while I was on it with a headrest out of my son's silly car, I mean celica to give a comfortable head position.



Re the cardboard- not knowing the type of cardboard your using(corrugated ?) I would consider impregating it with resin, as the foam sandwich construction relies on the thin fibreglass skins being unable to move in relation to each other and the further apart they are, the more rigid the structure(this is why I used 20mm high density foam. The piece I used cost $20)
link for some background http://www.nakedrv.com.au/Way%20of%20the%20Future.htm
About 4 years ago one of the Sydney to Gladstone yachts had to run for shore under reduced sail when the crew hear her grinding her teeth(the 2 skins were moving in relation to each other grinding the foam to a powder, when this happens the yacht will literally fold in half- I personally think this is what happened with Australia 4)

The cardboard that was suggested to me was 5 layers.(about 6mm thick)
1.Top layer ...flat
2. corrigated
3. Flat
4. corrigated
5.Bottom layer flat
From past experience the resin will soak into the middle layer if covered both sides.

Tha actual shape and measurements need to be worked out to best suit the yacht and the pilot... as everyone wants something a bit different.

No ... No special program.... just used about 6 beer coasters (but not that many beers) to see if the idea would work.
Once i got my head around what i wanted i used my normal CAD program.
I probably made about 3 models along the way.
My original thought was to use a fridge packing box leaving it unpainted and calling the yacht "Cool Running"
The way i have done it is that each side support has a triangle shape cross section.
I think the concept would work well but the feet and shoulder positions could be a bit narrower
If you have a look at my 2 previous yacht pics "Sandpiper" & "Wildfire" in the yacht register you will sort of get where the idea came from.

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If anyone is wanting a FREE Cad software program to do Technical drawings with go to.....

www.cadstd.com/

And download the FREE version

A simple program looks good and works well....

landyacht said...

You might also consider lifting and rounding the seat at the knee positionto give enhanced comfort. At the top of the head rest it helps to have an angle change to suit the head .

I cant believe people would actually go out to buy cardboard I must live in a different dimension

My main aim in this seat design is to provide a VERY smooth underbelly to the seat to provide a clean aerodynamic shape (something very few people have done on small yachts).
Similar to "ground effect" on race cars
My comfort in the seat is well down the list when it comes to yacht performance.

Sometimes I just find it easier to buy new materials rather than recycle for the reasons of consistancy, availability, and not wasting my time, energy and fuel in searching for things.

Hi Ian
the only way I have found to upload the drawing is to copy the drawing, paste it in "Paint", and then "save as" a photo in "My Pictures". From my pictures, upload the file (now a photo / jpg) to "Photobucket" or your favorite on-line photo storage colection. From (Photobucket) your storage section, find the new photo, click on Img...... and the photo is copied. Go to Seabreeeze/landyacht, pick the page you wish to display the photo. Goto "Reply to Topic" , place curser on the main area where you type a reply and click the mouse. Click paste, and most importantly, click PREVIEW. When you add the image initialy, it will simply be a web site or whatever, no picture. When you click on "preview", the photo is displayed in full. If you dont want that photo display, cancel the screen by "Close Window" and you can start all over again. It sounds like a lot of messing around but you can get a drawing onto the forum page in less than a minute.
HINT :
If the displayed drawing/photo is too small on the forum page, cancel it out and return to your CAD drawing. "Select all" and go-to SCALE. Double the scale in both X & Y axis, copy and paste in paint, continue from there as above.
You may find the new photo/drawing is too big or still too small. Adjust the scale once again and go from there. This works for me, I hope it does for you. If someone else can direct you better, then go for it.

Kody

Gizmo said...

My main aim in this seat design is to provide a VERY smooth underbelly to the seat to provide a clean aerodynamic shape (something very few people have done on small yachts).
Similar to "ground effect" on race cars
My comfort in the seat is well down the list when it comes to yacht performance.

Sometimes I just find it easier to buy new materials rather than recycle for the reasons of consistancy, availability, and not wasting my time, energy and fuel in searching for things.

I used to put shape first too but after all these years my body says "comfort or just watching others.". the problem I find with smooth bottoms (on landyachts) is that everything bashes into them, otherwise I love a smooth bottom

that explains it, Im all bones

should have the seat situation under control ,just about to pull the first seat off the mould I made ,don't think I'm going to need seatbelts on this sucker ,just about need a crow bar and a bottle of vasso to get into this seat......will take some photos and post them over the next few days......now all I got to do is repair a puntured tyre (ran over a lump of timber with nails hanging out whilst moving it in the yard) and finish the custom tandem landyacht carying trailor..summer just around the corner bring on the NE seabreezers..