Author Topic: El Cheapo Foil Drive  (Read 2817 times)

surfcowboy

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Re: El Cheapo Foil Drive
« Reply #15 on: January 10, 2022, 12:50:06 PM »
Bill, weight is something I hadn't considered. Yeah, let a lightweight try it.

Also, maybe the efoil guys can recommend a motor replacement? There's a lot in that kit that's "done"if the boost can be boosted. Also there are a ton of props you can print. Matching that seems to be a place to get some efficiency.

Vancouver_foiler

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Re: El Cheapo Foil Drive
« Reply #16 on: January 10, 2022, 10:10:56 PM »
Yeah, I'm on the list for the boost fin as well. If it's a scam it's an elaborate one, but having played with this fin with a substantially larger motor and battery I doubt it does anything useful. Which is probably the real reason why we're not hearing anything new.

the bad news for the fin I'm trying is that it's too weak to really do much. It will push the board along at perhaps 2mph, which at first seems like it might be enough to be a help in waves. But the weight added from the battery pack (probably ten pounds) and the general clumsiness and drag of all that stuff make the little bit of boost probably not worth the effort. I still haven't tried it in real waves or swell, mostly because my knee is giving me fits, making it hard to get to my feet just to do ordinary foil surfing. But I'm not seeing much benefit in little swell, which is bad news since they are traveling so slow. I should have been able to paddle fast enough with the added boost to keep up--at least briefly--but I couldn't.

I'll get someone else to try this thing in the surf, but I think I've established the below lower bound for how much power we need for a practical boost. I can't find any spec from the company that sold me this fin for the wattage of the motor, but my guess given performance is that it's somewhere in the 100 watt range. The issue might be propeller efficiency as well, though the folding prop on the successful Australian booster looks fairly crappy as well. I'm surprised that it works as well as it seems to.

How about trying Two motors?!
Lol, kind of defeats the El Cheapo thing but then again a foil drive is 3k USD isn't it?

PonoBill

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Re: El Cheapo Foil Drive
« Reply #17 on: January 10, 2022, 11:40:27 PM »
I'm going to fit a more powerful motor. I'll have to rework the electronics and probably beef up the controller, but I can do all that. I wanted to change the control transmitter anyway. I'll also print a better prop. There are lots to choose from, as the cowboy says. The printer I have here doesn't have enough beans in the print head to handle polycarbonate, but I'll do an ABS one (which might work fine with whatever motor will fit this housing) while I'm considering a printer or just a printer head upgrade.

I got my knee shot up today and it's feeling good. And I'll start with a PT this week to work on getting it stronger. I'm back on intermittent fast, so with a bit of work I might be the lighter, agile guy that this thing needs. Well, that and some more power.

« Last Edit: January 10, 2022, 11:46:55 PM by PonoBill »
Foote 10'4X34", SIC 17.5 V1 hollow and an EPS one in Hood River. Foote 9'0" x 31", L41 8'8", 18' Speedboard, etc. etc.

juandesooka

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Re: El Cheapo Foil Drive
« Reply #18 on: January 11, 2022, 04:48:59 PM »
Boost Fin...I considered seeking the refund they promise, but figured for $200 I'll let it roll, see how it plays out.  Though my imagination does kick in for elaborate scams.

For this and the other el cheapo: I lean towards it probably not working, just not enough juice for what we need.  In contrast, we are well on the way to a Faux Drive diy knock off, the parts add up to about $1000cdn, or about $700US.   Luckily we have a friend with some know how on RC boats to put it together.  Sounds like you have the know-how too.

That basically gets you a semi e-foil, without water cooling needed and a fraction of the battery pack.  From what I've seen it has enough juice to get up on foil for a minute efoil style (though at risk of burning it). For jump starts, maybe 20-30 boosts in a session.  A friend with it is doing downwinders, he uses just 10-20% battery power in 20km+ runs.  That's rad!

surfcowboy

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Re: El Cheapo Foil Drive
« Reply #19 on: January 11, 2022, 06:12:26 PM »
J, that's rad man! I love the group effort and drafting an R/C guy. Perfect. That price is great and you can tailor it to what you need.

This will open up DW to so many people.

PonoBill

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Re: El Cheapo Foil Drive
« Reply #20 on: January 11, 2022, 08:09:48 PM »
Luckily we have a friend with some know-how on RC boats to put it together.  Sounds like you have the know-how too.

Yes, I've been doing fairly serious electronic stuff since I was 12 or 13. So 60+ years of making smoke and frying expensive parts. I also got into RC when the servo (called an escapement) was actually powered by rubber bands. So yeah, tubes and high voltage batteries. Weird to contemplate as I just built a goofy little dancing robot to add some spice to the putting green we installed for Diane. The little bugger doesn't do much, but it's got four servos and enough computing power to make the old PDP-1 I first learned programming on look like a four-function calculator.

https://youtu.be/wJEm0UsnQLk

The little kit came with an arduino. I'm going to swap it out with an ESP32 and add a phone interface with node-red controls. The "eyes" are a sonic rangefinder and it works pretty well for object avoidance. With only 4 degrees of freedom the movements are slow and a bit limited, but sometimes simple is good, I rewrote the dance routine in about five minutes and I added some showstopper moves in the fifteen minutes since I uploaded the video. In the golf game he'll wander back and forth in an open tunnel and when a ball goes by he'll break out some dance moves. One stroke penalty for hitting the robot, two if you knock it over, and four if we deem it intentional. Diane is already planning some costumes.

Brother Bob (stoneaxe) is making me a windmill based on the Eastham mill on his CAM router. Yeah, it's stupid stuff, but fun.
« Last Edit: January 11, 2022, 09:00:29 PM by PonoBill »
Foote 10'4X34", SIC 17.5 V1 hollow and an EPS one in Hood River. Foote 9'0" x 31", L41 8'8", 18' Speedboard, etc. etc.

juandesooka

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Re: El Cheapo Foil Drive
« Reply #21 on: January 12, 2022, 02:07:37 PM »
Yeah, it's stupid stuff, but fun.

Haha, like the ads for Comedy Channel "time well wasted".  As long as you're having fun, anything goes! 

My friend with the RC knowledge, he also had the gumption to buy a 3D printer.  That's a game changer for the DIY potential.  But another buddy said he's been getting parts made by this company: https://www.hubs.com   He said cheap and good quality, replaces need for a 3d printer...apparently there's lots of providers out there, just need the files.  On that note, the prop and mast mounts used by FD were reportedly based on files originally posted  to Foil Zone, then pulled once they started making them commercially.  Since then, my understanding is new versions of these files have since been posted again, so they are publicly available for those inclined.  FD sells spare parts but only to people who already bought an FD package.

 


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