pitch prop

Seeker's pitch-controlled propeller changes blade angle instead of relying only on engine speed. This gives fine control of thrust and lets the engine operate near a useful load when combined with power from the sails.

Comments

I just passed the 1/3 mark on this thread, and man what a ride. I feel like I'm too deep into a bender where I just wanna go home and sleep it off but FOMO keeps me consuming... it's like some fucked up intellectual take on La Grande Bouffe. I wanted to read it all before posting too much but I'm actually getting queasy, so I'll take a breather to comment on how fundamentally fucked the drive system is on this ship of follies. First off, casting your own propeller blades is just plain stupid. Blade profile is the one place where driveline design strays from the realm of straightforward engineering and into the dark arts. This is possibly the very worst place to rely on intuition, where all manner of diligent engineering practices and CFD won't get you anywhere near the very expensive experience gained by the industry. Now about that bus transmission... using an automatic transmission? For the stated purpose of increased fuel economy?? In front of a CPP??? I'm at a loss for words... The idea to introduce a transfer case into this sorry mess is where it gets really wild. On some level he must understand that what he needs isn't more ratio... right? And certainly not a compounding five two to one. Phew. It is actually impressive to fuck something up so comprehensively. Most comparable attempts never make it off the blocks.

Fundamentally fucked? That's a pretty low bar for a prediction. Everything on Seeker has been fundamentally fucked according to Sailing Anarchy at one time or another.

Casting our own propeller blades wasn't stupid. It was fun. We learned how to cast some big-ass bronze blades, and they have pushed a 70-ton boat a hell of a lot farther than the people predicting their failure ever expected.

Is the drivetrain perfect? Hell no. The reduction is too low. That's why we're changing it. The Hundested variable pitch propeller works. The Cummins works. The AT545 works. The prop works. And now we're adding the NP205 transfer case to get the reduction closer to where we want it.

That's the difference between building something and being a loser sitting behind a keyboard explaining why somebody else shouldn't have built it. You build it. Try it. Break shit. Learn something. Fix it. Then go try it again.

If the objective had been to design the perfect drivetrain on paper before leaving the dock, Seeker would probably still be sitting in the front yard. Instead, we're out here using the damn thing.

Seeker Fundamentally Rocks!

Sailing Anarchy

Junk Sails and Beautiful Frames

Starts at 3:58

Junk Sails and Beautiful Frames

Starts at 6:54

Zonker regarding the cargo hold frames: That is the actual structure supporting the plate. I once told him in a Youtube comment that they were very silly with the huge cutouts so they'd collapse if ever loaded. He was not appreciative of the suggestion to change them.

Its not uncommon for hull strength to be misunderstood and for some reason the cargo hold frames got a lot of attention.

Frist off, they are not even needed. The frames not not part normal Origami boat plans. And no Origami steel boat has ever been known to have suffered structural failure.

The frames were added to Seeker as an extra measure. They do stiffen the hull sides, but they more importantly attach to the frames in the keels helping Seekers ability to withstand a grounding in rough seas.

And yes the lightening holes are on the inward side of each frame where compression loads would be greater but they were not cut to save weight. They were cut because they are beautiful and provide attachment point for tables, equipment and securing cargo.

Sailing Anarchy

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Hundested

pitch prop

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