Search found 185 matches

by Amati
25 Dec 2016, 21:11
Forum: Proa Tech
Topic: Leeward Hydrofoils
Replies: 12
Views: 2740

Re: Leeward Hydrofoils

I wonder if something more like the foil stabilized tri Groucho might be a tiny bit better, or at least different :D Basically your deck extending out to leeward more with a lifting section, so when immersed, it would developed lift, as well as adding floatation- very much like current lee pods, but...
by Amati
25 Dec 2016, 20:44
Forum: Proa Tech
Topic: Spinlugger rig?
Replies: 25
Views: 4694

Re: Spinlugger rig?

Hello I accidentally came across this thread and thought I would joint to comment on it. The sketch in the first post is mine from a few years back. I had no intention of it being used for a cruiser, the exact opposite in fact. It was proposed as for a minimal proa a bit like a beach cat. The idea ...
by Amati
25 Dec 2016, 20:25
Forum: Proa Tech
Topic: Spinlugger rig?
Replies: 25
Views: 4694

Re: Spinlugger rig?

Dipping lug
IMG_1087.JPG
IMG_1087.JPG (30.19 KiB) Viewed 1488 times
by Amati
25 Dec 2016, 19:14
Forum: Proa Tech
Topic: Spinlugger rig?
Replies: 25
Views: 4694

Re: Spinlugger rig?

I actually did a dipping lug but on an ama less-IC - You can use the dipping lug as an air rudder the lug would be do-able to dip/shunt IF the platform is stable at rest. Powerful sail, close winded. An unstayed rig will work- needs to be very stiff- the windward mast does little 2 the l/d, so keep ...
by Amati
28 Mar 2016, 23:28
Forum: Proa Tech
Topic: Continuous curve vs curve-straight-curve
Replies: 13
Views: 4574

Re: Continuous curve vs curve-straight-curve

FWIW, I spent a very happy 4 hours with one of the fluid guys for Luna Rossa drinking wine and talking fluid flow. He's also a retired tech fellow at Boeing, so I reckon he's got some chops. Anyway, their best keel was what you'd expect on front, but the back 1/3 or so of the keel section was a stra...
by Amati
20 Jan 2016, 04:57
Forum: Designing
Topic: Easy18
Replies: 5
Views: 1903

Re: Easy18

How do you keep the 'bow' rudder from snapping off?

Here in Washington state the Magic length is 16'. So 2 hunks of plywood is just right....
by Amati
10 Jan 2016, 02:18
Forum: Proa Tech
Topic: Continuous curve vs curve-straight-curve
Replies: 13
Views: 4574

Re: Continuous curve vs curve-straight-curve

The main downside of this shape, AIUI, is that it accentuates the wave resistance hump. Although at higher Bruce numbers the Prismatic might be cool.
by Amati
09 Jan 2016, 02:34
Forum: Proa Tech
Topic: Force balanced proa anyone?
Replies: 20
Views: 4878

Re: Force balanced proa anyone?

Helium? I know. Storage would be, um interesting. And it's expensive and a limited resource. But hydrogen blows up. Aargh, laddie, and then the kite exploded. And they Keelhauled me. Didn't hurt laddie, the keel was so shallow. And narrow. Light displacement hulls. Aargh. The 40 knot sailboat. I rea...
by Amati
07 Jan 2016, 19:42
Forum: Designing
Topic: design a beach / lagoon proa
Replies: 101
Views: 20513

Re: design a beach / lagoon proa

Here's something else that might get some synapses firing

http://www.outsideconnection.com/gallant/kayak/

He turned a kayak into a light air windsurfer :!:
by Amati
07 Jan 2016, 17:15
Forum: Designing
Topic: design a beach / lagoon proa
Replies: 101
Views: 20513

Re: design a beach / lagoon proa

Try googling 'class b sailing canoes', and take a peek at the images. It's almost an underground movement.