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by larsb
Jul 18 2020 10:56am
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 1158
Views: 115874

Re: Votol EM-100 & EM-150 controllers

That’s too rough steps, you need to be within max 20-30 degrees from optimal for it to work well and ideally max 5-10 degrees.

Do you have cutouts only with noload or also when driving?
by larsb
Jul 18 2020 9:58am
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 1158
Views: 115874

Re: Votol EM-100 & EM-150 controllers

I believe that motor has a square bemf and should ideally be driven with square wave controller.
What other phase angles did you try besides -120? That’s your biggest chance of getting it to work to find the optimal phase angle match.
by larsb
Jul 14 2020 5:04pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Final push to get the barge ready for water!
Wired motor, and most of the rest. Only throttle and phase connectors on motor side left
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by larsb
Jul 14 2020 1:59am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Rieju 50cc conversion
Replies: 233
Views: 33198

Re: Rieju 50cc conversion

. .. Have you seen any math for e-water crafts like e-surf/wake/long/e-foil what kind of power is needed to have fun? And I don't mean fun in the EU 250w category - that ain't even close to any fun, I am thinking more like upgraded sur-ron fun. :) I’ll learn to crawl before i walk :wink: Let’s see ...
by larsb
Jul 13 2020 4:39pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Drive unit put together: 063D9587-6339-43EB-8B25-FDAF09A844D1.jpeg I cut the hole for the wires in the mast with my dremel, that’s a 400 euro cut :wink: Started to thread the wires inside the mast but realised i need to open up a bit more in the top to get the last wire through. 9790557A-C99A-4026-8...
by larsb
Jul 13 2020 7:34am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Motor mount fits perfectly on the mast :D
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6D3C7BA9-BC04-4243-9D6E-C7A89A255A7A.jpeg (125.1 KiB) Viewed 818 times
Instantly i wish i’d done a larger cutout for the phase wires in the motor mount but it’ll fit anyway.
by larsb
Jul 13 2020 2:27am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Added some coats of electrical varnish to the stator for waterproofing
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I’ll switch to stainless bearings also but later, need to order them.
by larsb
Jul 12 2020 2:54pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Mast mount nuts and cable outlet glued,
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mast mount and spacer plate finished.
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CF48EB53-C0E7-49B8-887C-F3520125213F.jpeg (121.56 KiB) Viewed 841 times
Tomorrow it’s electric time.
by larsb
Jul 11 2020 11:06am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Rieju 50cc conversion
Replies: 233
Views: 33198

Re: Rieju 50cc conversion

The efoils get away with fairly low power, 3-5kW seems like OK power for efoil fun. We’ll see in 3 wks time :D
by larsb
Jul 11 2020 5:43am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

This section of ES is dead these days. I can understand why everyone went to efoil.builders but i really don’t like the ad driven forum over there. ES is way better in this regard :thumb:
by larsb
Jul 11 2020 2:54am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Final glassing, electronics bay done.
964CDBB4-D617-4793-A297-027555B0A082.jpeg
964CDBB4-D617-4793-A297-027555B0A082.jpeg (102.55 KiB) Viewed 865 times
the cloth in the bottom didn’t want to lay completely flat so i added some weight on top of it.
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It’s time to get the motor and electronics connected :D
by larsb
Jul 10 2020 1:14pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Some dremel grinding later, recessed also the mast mount to make it easier on the wires.
They are 6-7AWG/10mm2 cross section so it’s a tight fit both into and through the mast.
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8691AF96-7FEB-48E4-94A0-7EA94B54CEEF.jpeg (127.13 KiB) Viewed 887 times
by larsb
Jul 10 2020 10:55am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Made a spacer plate for the mast mount to be able to route the wires into the mast without cutting a large recess in the board. There’ll be a cut in the rear (left) side of the plate that’s not done yet in the picture.
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A46ED226-8B28-46B1-AE71-8F3B08680237.jpeg (128.67 KiB) Viewed 894 times
by larsb
Jul 09 2020 11:32am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Bagged and ready, i had a couple of holes in the bag that evaded my sealing attempts for too long. I’ll not be suprised if i need to do some touch-ups tomorrow when i see the result.
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E26FBBC1-ADA4-4BBA-B508-ECD8EF791E48.jpeg (134.79 KiB) Viewed 914 times
by larsb
Jul 09 2020 4:36am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Prepping for glassing by sanding the sides and top layer. I haven’t done this size of glass fibre build before, it’s a fair bit of work. Just making a two meter vacuum bag took about an hour :wink: 92F8BB0D-A9C1-4B46-A2E0-14CA3AC7732F.jpeg V-cut in the rear is to evacuate water from around the elect...
by larsb
Jul 08 2020 12:22pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Motor mount for the mast is finished. I hope it fits, had to draw it from an outline sketch of the mast and i was aiming for a tight fit so it’s not 100% sure. D8D683C4-62DC-4A56-82BE-1113162AF137.jpeg I have glassed first layer on the top, now i’m cutting cloth and vacuum bagging material for the b...
by larsb
Jul 07 2020 9:15am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

I got a new pwm dimmer rated at 24v/30A. I don’t see a use for more power really for the hotwire cutter. Hopefully it works together with my computer charger, we’ll see when i do the next board :D
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0FBB62BE-1220-4460-B4A4-D150D3B8DC0D.jpeg (70.28 KiB) Viewed 966 times
by larsb
Jul 07 2020 9:11am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Yes, but the maytech and other clones are quite expensive and efficiency seems poor from the dyno sheets. I think they might have been tested at too high current/torque though.

80100 is a quite good motor for the price and i had it already :thumb:
by larsb
Jul 07 2020 1:26am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Rieju 50cc conversion
Replies: 233
Views: 33198

Re: Rieju 50cc conversion

.. you might tackle the foil thingy much faster. .. Didn't Matt (davinci drive) venture into e-foils a few years back, or was it e-jet boards? Wonder if he ever completed his project? i’ll have to practice quite a bit, have always been a slow but steady learner :wink: I never read the watercraft th...
by larsb
Jul 06 2020 11:23pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

This is a rubber modified epoxy, doesn’t sand so well and i doubt i can make the rotor round again by hand..
by larsb
Jul 06 2020 3:29pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

I tried to epoxy the rotor magnet gaps to lower drag losses under water, turned ut uneven and it was too late to clean it. f*cking hell! It will be totally unbalanced, it's likely unfixable so i basically scrapped the rotor. :x I have one more try, i'll do the other rotor with just silicone. if resu...
by larsb
Jul 05 2020 12:43pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

”Unavailable” to me in sweden..
by larsb
Jul 05 2020 7:39am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Battery doesn’t fit in the box height or width in the way i wanted as the lid protrudes inside the wall of the bottom part. It doesn’t matter, i have some room to spare, i’ll rotate it and cut away part of the lid. I planned an alu plate lid for better heat exchange anyway 8) AF05ACFC-8120-4C4D-931F...
by larsb
Jul 05 2020 2:00am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Yep, that’s what i did. The confusing thing is that 3m77 spray was foam safe historically but now exists in two variants due to california environmental regulations, one with acetone in it (that can barely be used on foam if very careful) and then the old formula. There’s also 3m78 that’s specific f...
by larsb
Jul 03 2020 3:29pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 87
Views: 5471

Re: ”The barge” efoil build

Support material was sticking so it looks a bit rough, i’ll try to finish it with carbon and epoxy. It’s still quite strong!
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Later on i’ll print some other props also, that’s the big question for the drive system.