Search found 6 matches

by Dave Z
Fri Feb 24, 2017 10:06 am
Forum: Technical Papers for review and comment
Topic: Proposal: Sail Performance Analysis Rig (SPAR)
Replies: 7
Views: 357

Re: Proposal: Sail Performance Analysis Rig (SPAR)

Hi Robert, Thanks for taking me to school... I've now done some actual homework, and see and agree with all your points. I'll mull this over to see if anything useful is left. Thanks, too, for your patience and clear explanations. I appreciate the thought and careful analysis you've brought to this ...
by Dave Z
Wed Feb 22, 2017 6:00 am
Forum: Technical Papers for review and comment
Topic: Proposal: Sail Performance Analysis Rig (SPAR)
Replies: 7
Views: 357

Re: Proposal: Sail Performance Analysis Rig (SPAR)

Hi Robert, Okay, I've thought about your comments and think I have it clear, more or less, what your mean. In response, I'll refer to the following diagram: https://drive.google.com/uc?export=download&id=0B0fFGU4VD6amZC1IYUt0OGhhc1k To start by answering your question, my ill-chosen "windwa...
by Dave Z
Thu Feb 16, 2017 8:38 pm
Forum: Technical Papers for review and comment
Topic: Proposal: Sail Performance Analysis Rig (SPAR)
Replies: 7
Views: 357

Re: Proposal: Sail Performance Analysis Rig (SPAR)

Robert Biegler writes: I can see how knowing the direction of the wind and of the deflection at the base gives you the lift to drag ratio, but only if any vertical sheeting forces are contained within the rig, through a really strong vang, or a wishbone boom. Sheeting as shown in the picture would p...
by Dave Z
Wed Feb 15, 2017 9:53 pm
Forum: Technical Papers for review and comment
Topic: Proposal: Sail Performance Analysis Rig (SPAR)
Replies: 7
Views: 357

SPAR Gimballed Tube vs Pin, and Heel Stop Collar

SPAR Gimballed Tube vs Pin, and Heel Stop Collar: Addressing Rotating vs Fixed Mast Issues Richard Dreyden is looking into a rotating mast rig. His solution is to use a gimballed tube, capped at the bottom, in place of the pin through the mast. His mast will rotate within it. This strikes me as an ...
by Dave Z
Tue Feb 14, 2017 10:23 am
Forum: Technical Papers for review and comment
Topic: Proposal: Sail Performance Analysis Rig (SPAR)
Replies: 7
Views: 357

Proposal: Sail Performance Analysis Rig (SPAR)

https://drive.google.com/uc?export=download&id=0B0fFGU4VD6amWXU5MlVWMGJncVU Proposal toward an Inexpensive Sail Performance Analysis Rig (SPAR) by Dave Zeiger ( http://Triloboats.com ) SPAR is an idea I’ve been kicking around for a while. I’ve come to realize that actual development would benef...
by Dave Z
Tue Feb 14, 2017 12:36 am
Forum: Welcome to the AYRS Forums
Topic: Dave Z
Replies: 0
Views: 138

Dave Z

Hello All, I'm of the class of 'bearded eccentrics', living with my partner, Anke, aboard engine-free sailboats in SE Alaska for going on three decades. Mostly DIY, junk-rigged square boats. I design (doodle, might be a better description) what I call box barge/scows. You can see my work at http://t...

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