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Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

Posted: Sep 14 2021 2:59am
by wturber
Here's a better video with testing of Polymaker's Polymide CoPA filament. I get the feeling that Stefan and Justin would get along with each other famously.


Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

Posted: Sep 14 2021 9:01pm
by nicobie
Impressive filament for a hobbiest looking for strength. Pretty darn pricey though.

Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

Posted: Sep 15 2021 11:31am
by DogDipstick
"averaging 700-900 watts"
That is alot of power for a set of solar panels, right? 5+kWh in the day? Seems like alot ( of power).

God Damn. Look at those ball screws. Them are some ballscrews. I have a teacher inthe family who does nothing but CAD and 3d printing destign and schooling. I have learned alot from him, ad he always says ( has said)rigidity is key.

I just spent on Hiwins.

(7) (1060mm) linear rails and 14 angular contact bearing blocks. Spent5 more than I feed myself in a year. Now time to empty that bank again for the ballscrews.

I love boats. We did do our Electric - powered steamer. It went... fast. Wake for days. Javelin's bow was six feet out the water.
3000 psi design boiler, 300psi working load. Then the Feedwater pump failed and burnt all the gaskets in the entire superheater stack. Lol Every one.. Dust. Cut new carbon fiber/ graphite gasketry and away we went.

Keep up the cool stuff, you make it easy for us, Justin. You do make it look easy. I spent two days wiring that boat and thought I did a good job... 5 relays, and standard circuitry. Watertite conduit and gland nuts, Properly sized, code meeting boxes in plastic. Gaskets on the entire electrical system. everywhere. Its so deep in there.

I would like to see more pictures of your wiring scheme: How you handle power, sensor circuitry, if you separate them, or what you do,: with redundancy and reliability in mind: for my educations.

.. Or some reference to the standards you follow.

Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

Posted: Sep 15 2021 4:25pm
by wturber
nicobie wrote:
Sep 14 2021 9:01pm
Impressive filament for a hobbiest looking for strength. Pretty darn pricey though.
Sure. But at 2-3 times the price of ordinary PLA, it isn't exactly exotic. And it is only about 50% more expensive than the Carbon Fiber PETG that was initially used. The problem with these things is the cost of experimenting. But if Grin is going to be using 3D printing more and is willing to spend thousands on a high quality industrial printer, then having $67 a kg for a filament that can make many parts shouldn't be a deal breaker. It isn't even outrageous for a hobbyist if there's really a need.

Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

Posted: Sep 15 2021 8:23pm
by nicobie
Well, that's true.