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by Voltron
Feb 26 2020 7:11pm
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

This guy, Kotaro Horiuchi, pretty much perfected the submerged two foil power setup, where well designed alignment of the thrust makes it naturally lean into the turns.
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by Voltron
Feb 26 2020 7:03pm
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

Nothing new under the sun as the saying goes...
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Basic aftermarket surface piercing set up.
by Voltron
Feb 23 2020 12:12pm
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

The Hobie version they made for a while.. The yellow L foils flip under the boat in use... You did NOT want to run that one aground!
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by Voltron
Feb 23 2020 12:07pm
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

It is an amazing feeling when you start sailing faster than the wind speed in smooth water... Magical. Some of the new boats can do 2.5 times the wind speed in perfect conditions... Going 20kts in 8kts of wind creates this weird sensory field that makes your brain reel. Just watch out for stumps and...
by Voltron
Feb 22 2020 12:39am
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

Some surface piercing type.... For a while Hydroptere held the outright sailing speed record and the measured mile speed record. 078f950f24518ebfcb689367d6449d43.jpg Large_2012lHydroptereDCNS9Copyrigh_Francis_Demange.jpeg That was an incredible feat, as most drag race sailboats are tiny and fragile,...
by Voltron
Feb 21 2020 10:20pm
Forum: E-Bike Technical
Topic: Bafang brake cut-off 3 wires to 2 controller wires
Replies: 10
Views: 579

Re: Bafang brake cut-off 3 wires to 2 controller wires

It could totally be that too...a quick continuity test should show what's up.
by Voltron
Feb 21 2020 9:23pm
Forum: E-Bike Technical
Topic: Bafang brake cut-off 3 wires to 2 controller wires
Replies: 10
Views: 579

Re: Bafang brake cut-off 3 wires to 2 controller wires

It might depend on your system, it needs 5 volts in... And its looking for something near 5v out as the cutoff, but not less than a volt or so, as zero makes it think the brake is disconnected.
by Voltron
Feb 21 2020 5:01pm
Forum: E-Bike Technical
Topic: Bafang brake cut-off 3 wires to 2 controller wires
Replies: 10
Views: 579

Re: Bafang brake cut-off 3 wires to 2 controller wires

More and more of the three wire ones are Hall sensor type, and won't work with cheap generic controllers looking for a two wire signal. The plus for manufacturers is they're harder to bypass...the whole system shuts down without the brake wires plugged in. The plus for users is nothing... It sucks i...
by Voltron
Feb 21 2020 2:13pm
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

It turned like it was on rails regardless of tilt... You could feel the g forces trying to fling you out of the boat in high speed 180s. Edit... But if you meant did heeling induce a turn, not noticably, esp compared to a regular keelboat, where when you heel there's a big offset between the drag of...
by Voltron
Feb 21 2020 12:42pm
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

Here's some pics of some test boats for the next Americas Cup.... When they change directions, all three are temporarily swung down, then back to two most of the time. T foils rock 👍 1552946497930.jpg vbXPwYRQyO0YJN0Lpvuw_Emirates-Team-New-Zealand-launch-AC75-America's-Cup-boat-in-Auckland-1280x720....
by Voltron
Feb 21 2020 12:29pm
Forum: Electric Watercraft
Topic: E-foil Foil Wing Design Discussion
Replies: 25
Views: 3802

Re: E-foil Foil Wing Design Discussion

Surface piercing foils are usually designed for a narrower speed range, and flatish water conditions, which on say a powered ferry on a river is fine. Then you get major wake reduction, and relatively simple construction. They're usually are designed to self limit the ride height, with ever smaller ...
by Voltron
Feb 15 2020 2:34pm
Forum: E-Bike Technical
Topic: 2 Large, identical battery packs in series? POSSIBLE?
Replies: 20
Views: 1076

Re: 2 Large, identical battery packs in series? POSSIBLE?

If you're just running the BMS for charging it's not an issue... But as people have said, starting with quality matching packs helps a lot. I ran matching packs in series for 20s, then paralleled them with roughly matching capacity packs for the range I needed for a particular ride. PSX_20200110_105...
by Voltron
Feb 11 2020 1:54am
Forum: Items for Sale - Used
Topic: FS - Used CA3 DPS
Replies: 1
Views: 341

Re: FS - Used CA3 DPS

I'm interested.. I'll pm you
by Voltron
Feb 11 2020 1:39am
Forum: E-Bike General Discussion
Topic: Does anyone know this frame? and where can I get it from?
Replies: 7
Views: 528

Re: Does anyone know this frame? and where can I get it from?

It's close to this one, Futr Beta, but the seat tower is a little different.

Random Google ones...
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by Voltron
Feb 11 2020 12:49am
Forum: E-Bike Technical
Topic: Turning pedal assist into "constant on."
Replies: 30
Views: 3588

Re: Turning pedal assist into "constant on."

I like to just jam my grip against the throttle when I want it to stay on... So great on cold mornings riding with your hands in your pockets 👍 If you tap where it's says KVID0020 it will take it to YouTube instead of the weird viewer here... It links to a couple of other vids too... Kvid0021 has a ...
by Voltron
Feb 11 2020 12:37am
Forum: E-Bike Technical
Topic: Turning pedal assist into "constant on."
Replies: 30
Views: 3588

Re: Turning pedal assist into "constant on."

It's not just metal pieces., It's magnets, alternating polarity in a pattern. Some discs won't work with some controllers, or need to be mounted reversed to the arrows on the disc, and you can't just hotwire it together as it wants the pulse pattern. Sometimes there's a plug coming out of the contro...
by Voltron
Feb 09 2020 6:15pm
Forum: E-Bike General Discussion
Topic: Troubleshooting hub motor
Replies: 20
Views: 1147

Re: Troubleshooting hub motor

My bad..I meant backwards so the clutch is engaged..
by Voltron
Feb 09 2020 12:41pm
Forum: E-Bike General Discussion
Topic: Troubleshooting hub motor
Replies: 20
Views: 1147

Re: Troubleshooting hub motor

It works with a gear motor also, as long as you spin it forwards.
by Voltron
Feb 09 2020 8:41am
Forum: E-Bike General Discussion
Topic: Troubleshooting hub motor
Replies: 20
Views: 1147

Re: Troubleshooting hub motor

A quick field test is to short two of the three phase wires together and hand spin the motor. The motor starts cogging when the windings aren't damaged... If the motor still spins freely the winding are damaged internally.
by Voltron
Feb 05 2020 12:13pm
Forum: E-Bike Technical
Topic: How much low speed power difference with hub motor 26x3 vs 27.5x3 wheels/tires?
Replies: 10
Views: 590

Re: How much low speed power difference with hub motor 26x3 vs 27.5x3 wheels/tires?

During testing I laced one motor up to a 24, a 26, and a 700c, and it got noticably worse in performance with each larger size wheel. I think you will notice a difference if you step down a size, as long as you're not dragging the cranks.
by Voltron
Feb 03 2020 2:45pm
Forum: Motor Technology
Topic: Hub motors - Why such bad power to weight
Replies: 3
Views: 443

Re: Hub motors - Why such bad power to weight

With the Motenergy type, another difference is they are typically inrunners, with the coils on the outer shell, where they cool better. Hub motor has to have the coils inside with the outside spinning, so the coils don't have as good a thermal path to the outside.
by Voltron
Jan 29 2020 9:20pm
Forum: E-Bike General Discussion
Topic: Ebike Hub 3 phase wire melting issue
Replies: 24
Views: 3525

Re: Ebike Hub 3 phase wire melting issue

In my experience that's not the case. In power applications, esp where there's codes to follow, crimps are better. No solder wicking up the stands making the stands break at the flex point, no uncured flux eating at the wires, and no solder melting off during overheat situations, and full conductivi...
by Voltron
Jan 29 2020 12:17pm
Forum: E-Bike General Discussion
Topic: Ebike Hub 3 phase wire melting issue
Replies: 24
Views: 3525

Re: Ebike Hub 3 phase wire melting issue

One thing about those blocks, some were comparing them to the bus strips in a house power hookup. It's totally not the same... You would have to override every circuit breaker and run everything at once in a house to get the bus to heat up at all. That's where the looseness over time comes from. In ...
by Voltron
Jan 19 2020 10:44pm
Forum: Battery Technology
Topic: Nickel plated steel strip for li-ion Battery pack - Purpose of Nickel Plating?
Replies: 3
Views: 437

Re: Nickel plated steel strip for li-ion Battery pack - Purpose of Nickel Plating?

It's better conductivity. That's what you don't really want to use If you can avoid it... Pure nickel is better. More conductive, no rust (the plated steel rusts thru from thin spots in the plating in wet conditions), less overheated strips melting thru the heatshrink on the cells.
by Voltron
Jan 12 2020 6:08pm
Forum: E-Bike Technical
Topic: Where would you place a 72v 25ah battery on this frame?
Replies: 22
Views: 1381

Re: Where would you place a 72v 25ah battery on this frame?

Then you'll be getting lots of pedal strikes as the bottom bracket will be closer to the ground. Just wondering, are you actually going to be trail riding, or making a pavement burner?