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The Foil Zone => Foil SUP => Topic started by: SUPdad on May 26, 2021, 10:12:27 PM

Title: Foildrive motor
Post by: SUPdad on May 26, 2021, 10:12:27 PM
Just ran across this thing. Converted to USD is about $2600.  :o

https://www.foildrive.com.au/shop
Title: Re: Foildrive motor
Post by: MURF37 on May 27, 2021, 08:19:33 PM
Hey SupDad

I currently have a FoilDrive system on my board and struggle to take it off now.

They are bloody good fun and open up even more spots for foiling :)
Title: Re: Foildrive motor
Post by: Seattle-Wind on June 01, 2021, 07:49:00 AM
Hey SupDad

I currently have a FoilDrive system on my board and struggle to take it off now.

They are bloody good fun and open up even more spots for foiling :)

How long does the battery last while in use? How big is the battery (watts)? Thanks!
Title: Re: Foildrive motor
Post by: SUPdad on June 02, 2021, 12:34:23 AM
I think they added more stuff to their website as I didnít notice the spare parts before. Battery specs:
Voltage - 22v
Capacity - 12ah
Energy - 259wh
Title: Re: Foildrive motor
Post by: SUPJorge on June 02, 2021, 09:35:15 AM
This looks promising!
Title: Re: Foildrive motor
Post by: MURF37 on June 02, 2021, 02:29:50 PM
I think they added more stuff to their website as I didnít notice the spare parts before. Battery specs:
Voltage - 22v
Capacity - 12ah
Energy - 259wh

Hey Mate

If I don't abuse the battery and just use it for starts I can get about 1.5 to 2 hours out of a battery but it also depends on how many waves
you get and if you use it for cruising back out.  I am 80kgs and am riding a 5'7 99L sup with it.
Title: Re: Foildrive motor
Post by: Phils on June 02, 2021, 04:48:23 PM
Very interesting but I don't seem to see much details on their site.  The motor attaches to mast and is wired to a small pack attached to back of board.  How do you turn it on and off?  What does the pack weigh?   Thanks
Title: Re: Foildrive motor
Post by: PonoBill on June 03, 2021, 09:00:21 AM
It looks like it uses a typical wireless controller. That's a dinky battery for an eFoil but makes perfect sense for a boost.
Title: Re: Foildrive motor
Post by: MURF37 on June 03, 2021, 02:34:43 PM
Very interesting but I don't seem to see much details on their site.  The motor attaches to mast and is wired to a small pack attached to back of board.  How do you turn it on and off?  What does the pack weigh?   Thanks

Hi Mate

The whole pack weighs about 3Kgs.  The motor is controlled through a throttle which is attached to your paddle.
Title: Re: Foildrive motor
Post by: MURF37 on June 03, 2021, 02:38:59 PM
It looks like it uses a typical wireless controller. That's a dinky battery for an eFoil but makes perfect sense for a boost.

Its certainly not an efoil. 

If you really want to you can paddle and pump it up and ride around on flat water but its not what its designed for.
Title: Re: Foildrive motor
Post by: SUPJorge on June 07, 2021, 10:11:48 AM
It looks like it uses a typical wireless controller. That's a dinky battery for an eFoil but makes perfect sense for a boost.

I'm buying one right after Pono tries one and gives it the thumbs up.
Title: Re: Foildrive motor
Post by: blueplanetsurf on June 07, 2021, 10:44:18 AM
It even works with the paddle held backwards!
Title: Re: Foildrive motor
Post by: SUS4Life on June 07, 2021, 11:40:09 AM
It even works with the paddle held backwards!

https://www.instagram.com/p/CPA03cEDiOQ/
I don't think he even need a paddle at all.
Title: Re: Foildrive motor
Post by: surfcowboy on June 07, 2021, 07:43:27 PM
It even works with the paddle held backwards!

Haha, 100% that guy is a prone foiler who they got to do that video.

ďCome on Gary, just go catch a couple on the SUP so we can market to those people too.Ē
Title: Re: Foildrive motor
Post by: PonoBill on June 08, 2021, 09:59:48 AM
I'm not likely to buy one, but I might build one. I've been wondering what I should do with my spare foil motor--one is for the TowBot. I think I've settled on this. I've got a big box of LiFe 26mm cells that I didn't use for my MoHo battery (went with two Tesla modules instead). The mast clamp is sized for a 16cm mast. I'll either open it up to handle 19cm or get a 16cm Axis mast. This motor and reduction gear is sized for a high-speed efoil, so it's a bit of overkill as a booster, but I've got it, might as well go with it. It looks, heavy, but it's not. Good motor and a reduction gear.

Good excuse to build a board too.
Title: Re: Foildrive motor
Post by: Phils on June 08, 2021, 10:15:43 AM
I think these folks implemented some really good ideas for this concept.  It will only get better.
Title: Re: Foildrive motor
Post by: juandesooka on June 20, 2021, 08:00:09 AM
I'm not likely to buy one, but I might build one. I've been wondering what I should do with my spare foil motor--one is for the TowBot. I think I've settled on this. I've got a big box of LiFe 26mm cells that I didn't use for my MoHo battery (went with two Tesla modules instead). The mast clamp is sized for a 16cm mast. I'll either open it up to handle 19cm or get a 16cm Axis mast. This motor and reduction gear is sized for a high-speed efoil, so it's a bit of overkill as a booster, but I've got it, might as well go with it. It looks, heavy, but it's not. Good motor and a reduction gear.

Good excuse to build a board too.

This is a toy that I would love to have but can't justify the $. Ain't gonna happen.  I also don't the skills or inclination to learn to DIY it (and my foil DIYing has shown pretty clearly it ends up more expensive than just buying  :P )

I am curious Pono, for someone who knows what they are doing, what do the parts add up to?  If the marketed foil drive is $3k, are the parts half of it? 

Title: Re: Foildrive motor
Post by: PonoBill on June 20, 2021, 08:54:57 AM
If they plan to go through distribution and dealers it better be more like 1/3 of the retail price, otherwise perhaps half. Quantity produced matters hugely with a product like this. Tooling and prototypes can easily cost $20-50K. The more you can use already existing stuff, the less that will cost, though the more the final cost of goods will be dictated by other suppliers.

It would cost me about that much to DIY one starting from scratch. Those aluminum motor/gearbox ones cost me $1000 each and that was an extremely good price. Still needs a controller, a wireless throttle, and a battery.

I ponied up for one of these on Kickstarter a few years ago: https://boostsurfing.com/preorder/. According to the site, they are still working away on delivering. They raised about $2.5 million with a preorder price of around 200 bucks. I suspect these might be almost as effective for foil boosting and the pre-order price is now about 300 bucks. It's an open question whether or not this actually gets delivered, but the price is more in line with a product that could be sold in larger quantities. There's no question this can be delivered for the price--it's a lower spec, looking at a likely much bigger market. Battery, motor, housing, prop, and single-function controller. Not much different in tooling and component cost from a new 20 Volt lithium drill which sell in mass quantities for 130 bucks. In fact, they could (and maybe should) have looked at using a hefty wireless tool battery in a waterproof case to power the thing. Quick swapping, readily available, multiple uses. I like it. I powered an eBike with DeWalt drill batteries just screwing around. It was actually kind of practical.
Title: Re: Foildrive motor
Post by: juandesooka on June 21, 2021, 10:52:54 AM
If they plan to go through distribution and dealers it better be more like 1/3 of the retail price, otherwise perhaps half. Quantity produced matters hugely with a product like this. Tooling and prototypes can easily cost $20-50K. The more you can use already existing stuff, the less that will cost, though the more the final cost of goods will be dictated by other suppliers.

It would cost me about that much to DIY one starting from scratch. Those aluminum motor/gearbox ones cost me $1000 each and that was an extremely good price. Still needs a controller, a wireless throttle, and a battery.

I ponied up for one of these on Kickstarter a few years ago: https://boostsurfing.com/preorder/. According to the site, they are still working away on delivering. They raised about $2.5 million with a preorder price of around 200 bucks. I suspect these might be almost as effective for foil boosting and the pre-order price is now about 300 bucks. It's an open question whether or not this actually gets delivered, but the price is more in line with a product that could be sold in larger quantities. There's no question this can be delivered for the price--it's a lower spec, looking at a likely much bigger market. Battery, motor, housing, prop, and single-function controller. Not much different in tooling and component cost from a new 20 Volt lithium drill which sell in mass quantities for 130 bucks. In fact, they could (and maybe should) have looked at using a hefty wireless tool battery in a waterproof case to power the thing. Quick swapping, readily available, multiple uses. I like it. I powered an eBike with DeWalt drill batteries just screwing around. It was actually kind of practical.

Foildrive....I suspect they are actually quite reasonably priced given the tech involved.  Full efoils are 10-12k, the china knock offs are still 5k, so I think we are talking expensive parts.  The people posting about them in oz are all raving...so they work and seem decent quality. I can't really justify the $, but seems like fair value.

Boost...I am on the kickstarter waiting plan too.  They look kind of weak/slow compared to foildrive. I fully believe in "you get what you pay for" ... so I am a little doubtful about how much power and durability we'll be getting for $200.  I am hopeful that it'll be just barely enough juice to get up on foil in 8kts or on waves that wall up and don't quite break. Where my pumping or paddle power are nearly there, so just a short quick boost I may be up and gone.  We'll see.  I have been pestering them for months to send me a prototype so me and my geek foil army can macgyver up a foil version.  But they won't bite.  My selling point to them is that the foil market may have real potential for them, if it opens up possibilities. They are focused on the surf market, which is indeed multiples bigger....but as a lifetime surfer, their promotion and the testimonials are so cringey/kooky it's hard to watch.   At least with foiling the goal is a performance enhancement.  Feels like emphasizing this as a way to avoid learning to paddle or get in surfing shape is a mistake. As well, the extra drag with the fin always in the water, I doubt it'll work well enough to feel good for even an intermediate surfer.

Anyways....I am excited to see what the possibilities may be for e-assisted foiling.  :D
Title: Re: Foildrive motor
Post by: burchas on June 21, 2021, 04:23:58 PM
...This motor and reduction gear is sized for a high-speed efoil, so it's a bit of overkill as a booster, but I've got it, might as well go with it...

Nice experiment! In case it didn't work you're still left with 2 amphibious dildos, probably an overkill but hey, you are a large man :D
Title: Re: Foildrive motor
Post by: PonoBill on June 23, 2021, 07:45:18 AM
I spent a little time browsing the site. Spare parts are always expensive, but wow. The battery pack for this thing looks like it might cost $150 with a 100% markup. It's 600 bucks. The nutty prices for eFoils are probably driving the pricing. With Lift eFoils still selling for $12,000 there's a lot of room in the necessarily small market for making big margin. This thing looks like it's fundamentally assembled from standard parts. You can buy a new jetski for $5K, and at 12K you're well into the fancy-schmancy high power ones. Sure, you have to find a buddy to sling yourself into waves

But yeah, if you want one, have at it, but that dinky 19v, 10Ah battery pack is going to poop out a LOT sooner than you expect. That's the size of the flight pack for a large drone multicopter. Turnigy sells a 6s 10A pack for $120 retail (no BMS). If I do this silly thing I'd want at least 20ah. Lift's pack is about 100AH (I'm guessing, they're coy about it, but they say 2.1KW, at 20V that's 100AH. Lift wants $4k for a replacement battery--yikes). Anyone who has ridden an eFoil knows that a lot of the power consumption happens lifting your ass off the water. Once you're up you need to throttle down substantially. This thing is just for lifting--not for running. I'd expect maybe 5-10 lifts.

As a geek, I'm offended by the lack of solid information on the website, as a marketer I say kudos, these folks bullshit with the best of them.
Title: Re: Foildrive motor
Post by: WHS on June 23, 2021, 09:13:39 AM
This is a great concept at an marketable price point. I suspect it may not be the best value and trust PonoBill's opinion above. They may be greedy or maybe they just aren't getting very good component pricing. This is a great idea and like most great ideas will be stolen and made better and cheaper by someone else. Hopefully (for them) they are already working on a improved version for the same cost.
Title: Re: Foildrive motor
Post by: SUPJorge on July 01, 2021, 02:50:35 PM
Check this out, effectively flat water:

https://www.youtube.com/watch?v=4R80rzt5Dmw

PB, how much for you to make me one of these?  ;) Alternatively, I'm sidelined for a couple months due to SUP surf-induced shoulder surgery. Can you give me How-To instructions ...
Title: Re: Foildrive motor
Post by: Hdip on July 01, 2021, 04:17:27 PM
Alternatively, I'm sidelined for a couple months due to SUP surf-induced shoulder surgery. Can you give me How-To instructions ...

This thread doesn't have directions. But all the DIY efoil guys post here. It's way over my head, but I'm pretty sure if you go through a few of the "tow boogie" threads you will find directions and links on how to buy and build all that stuff.

https://foil.zone/t/foil-drive-assist-diy/12927/7
Title: Re: Foildrive motor
Post by: PonoBill on July 01, 2021, 05:50:13 PM
Check this out, effectively flat water:

https://www.youtube.com/watch?v=4R80rzt5Dmw

PB, how much for you to make me one of these?  ;) Alternatively, I'm sidelined for a couple months due to SUP surf-induced shoulder surgery. Can you give me How-To instructions ...

You don't need me. These parts plug together and deliver about the same thrust for a lot longer. You need the battery box kit and whatever 12 V motor drive you want to plug into it. Plug and pray.

(https://ae01.alicdn.com/kf/Haa0bb54343ec4f7baffc993e4a647be5H.jpg)

Search for: 40AH battery box for electric motor power fin SUP BOARD propeller power source on Ali Express. The motor system sown in the ad plugs right in. You can do the whole thing for less than 900 bucks.
Title: Re: Foildrive motor
Post by: juandesooka on July 02, 2021, 11:16:26 PM


Search for: 40AH battery box for electric motor power fin SUP BOARD propeller power source on Ali Express. The motor system sown in the ad plugs right in. You can do the whole thing for less than 900 bucks.

Link to the deal....this may be just the battery
https://www.aliexpress.com/item/1005001834152172.html?spm=a2g0o.productlist.0.0.33a22960hI0vUu&algo_pvid=d6a2fe2c-b35a-4318-838d-797d66d2a1f8&algo_exp_id=d6a2fe2c-b35a-4318-838d-797d66d2a1f8-0

tempting! But my rule is never ali without a first hand report :-)


Title: Re: Foildrive motor
Post by: juandesooka on July 05, 2021, 11:01:34 AM
the ali version appears to be same as this name brand one.  Seems to be same price. And there's very little info or reviews out there, definitely no foilers I can find.  I am intrigued, the price is halfway between boost fit and foil drive...but is the quality?  Still seems too risky without a first hand report.

https://www.aquamarina.com/bluedrive-s/
Title: Re: Foildrive motor
Post by: juandesooka on July 06, 2021, 02:19:00 PM
Talking to myself here because no one else will listen  :P

From foilzone, description of foildrive specs: "Itís a 6374 motor 120~300kv, Maytech remote (you donít need one, you can get a 20$ e-skate remote) you will need a 6s battery, 120~150A 3s-6s RC boat ESC like FlyColor, 3D printed prop, 3D printed mastclamp, you can build that whole setup for less than 300$, please do your own further research, youíre welcome."  Google those terms and it's basically an e-skateboard setup.  That's really interesting. It is probably over ambitious to attempt it. But would be a fun experiment.

Also from foildrive, seems W is a key measure (watts I am guessing).  Need 2000-3000W to get up.  Foildrive, if motor above is correct, is 3250W.  Boost fin is 800W.  That aquamarina is 240W....so it's useless junk, which is what I assumed given lack of any actual user reviews.

Title: Re: Foildrive motor
Post by: WHS on July 06, 2021, 06:12:26 PM
Talking to myself here because no one else will listen  :P

From foilzone, description of foildrive specs: "Itís a 6374 motor 120~300kv, Maytech remote (you donít need one, you can get a 20$ e-skate remote) you will need a 6s battery, 120~150A 3s-6s RC boat ESC like FlyColor, 3D printed prop, 3D printed mastclamp, you can build that whole setup for less than 300$, please do your own further research, youíre welcome."

I've tried searching around on foilzone and I could never make sense of all the options and how to  research putting it all together. Wish someone would just sell complete wired units (like the Foildrive) with higher end motors and batterys instead of incomplete kits like Flipski sells.
Title: Re: Foildrive motor
Post by: surfcowboy on July 06, 2021, 11:06:50 PM
Itís not that hard with a little research to sort out what to buy but yeah when you first start reading itís daunting. Iíd start a thread and get advice. Sounds like youíre about halfway there as it it from the foil geekís list. (Iím reading this one man lol.)

If itís looking like $300 then itís worth a try. I donít have a 3D printer but Iíll bet youíve got a friend who does. The tow boogie was like this and then guys got together and made a spreadsheet of what to buy and now itís fairly straight forward. Make it happen!! I might put a front fin on my Wing board and try to SUP it. ;)
Title: Re: Foildrive motor
Post by: PonoBill on July 07, 2021, 07:47:51 AM
Yes, watts is the power measure, but for a boosting drive you don't need to "get up", you just need some help. Anything that will push you to 3 mph will be better than nothing. There are a lot of people that can get up on a foil just paddling. If they are generating more than 100 watts I'll eat my calculator--paddling has to be the shittiest way to make power ever invented. A fit adult adept at a sport generates between 50 and 150 watts. Elite cyclists generate 300 and can burst to about 1000 but that probably requires drugs. 240 watts, if it's all delivered efficiently (probably more like 175) would be like having Laird help you paddle but he weighs 4 kG

3000 watts is a nice number for a full-on eFoil, where you don't do anything but push a button and balance. Even then, that amount of power will only be used if you are going stupid fast, like 40mph. On any eFoil the first thing you learn to do is not give full throttle to get up, the second thing is to throttle back quickly when you're up.
Title: Re: Foildrive motor
Post by: jondrums on July 07, 2021, 01:45:19 PM
This post has me thinking about a few things. 

quick run of the numbers:
Let's assume regardless of cadence that the paddler is pulling on the paddle half the time, and half the time is spend in recovery - pulling the paddle out of the water and returning it into the water for the next stroke.  We can ignore power used for recovery and just focus on the power generated in the pull stroke.   I just used a tape measure and estimated that I move my bottom hand about 16-18" on a power stroke.  Wild guess says I'm pulling on the paddle with 30lbs of force.  turns out this would be 60W continuous.    So, yeah less than 100W

In terms of cruising around - it shouldn't require more power than it takes to pump the foil.  That's gotta be less than 1000W or nobody would be able to pump around for more than a few seconds.  But I guess we have to remember that the propeller is pretty inefficient and we've added the drag of the motor.  I agree, it sure seems like 3000W would only be needed for going really fast.
Title: Re: Foildrive motor
Post by: PonoBill on July 07, 2021, 09:38:34 PM
Paddles are less efficient than propellors--a lot less. Even if you engage your core you're using small muscles. decent bicyclists are using the largest, most powerful muscles and have an extremely efficient power conversion system. A really good bicyclist puts out 150 watts. We are puny motors. One horsepower is 750 watts.
Title: Re: Foildrive motor
Post by: Solent Foiler on July 08, 2021, 01:35:11 AM
A really good bicyclist puts out 150 watts.

Sorry to be a pedant, but done a lot of cycling!

You're missing a 0 (a typo I'm sure!)

Should be 1500 watts, which will be close to peak, depending on what period you measure over ..

A pro cyclist Functional Threshold Power (loosely described as the power they can sustain for an hour) will be between 5 to above 6 Watts per kg, as power output is very dependent on weight. So a 60kg climber will have a sustainable hour power of around 360 watts.

Wake Thief calculated that foil pumping needs about 300 watts, so that sets the above in context... Pumping is hard work! At my best my FTP was just around 305 watts, giving me an FTP of around 4.5 watts/kg.
Title: Re: Foildrive motor
Post by: jondrums on July 08, 2021, 07:52:44 AM
Yeah, my best half hour of cycling on a stationary bike is 320W average (plus or minus the inaccuracy of the watt meter on the bike).   But Iím just about dead after 20seconds of pumping.  Cycling is quite a bit more efficient than pumping
Title: Re: Foildrive motor
Post by: Hdip on July 31, 2021, 11:14:06 AM
https://www.amazon.com/Electric-Surfboard-Suitable-Technology-Available/dp/B0863JYVJY/ref=sr_1_56_sspa?dchild=1&keywords=blunt+cut+fin&qid=1627755022&sr=8-56-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFIWFVOWVlPNElPTkYmZW5jcnlwdGVkSWQ9QTA1NTk0NThLOElQU1ZZNVNTRFkmZW5jcnlwdGVkQWRJZD1BMDIxNDYyMjEzUFA5OU1XU0RYVSZ3aWRnZXROYW1lPXNwX2J0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

Someone want to take a gamble? :)
Title: Re: Foildrive motor
Post by: SUPJorge on August 25, 2021, 07:57:44 AM
I've been following the original one pretty closely --> https://www.foildrive.com.au/shop.

The guy in this YouTube video appears to get foiling in almost flat water --> https://www.youtube.com/watch?v=4R80rzt5Dmw&t=366s

It really does look promising, may open up the East Coast of Florida for year-around foiling, but after shipping and duties it comes out to more than $3000. The value-added component I see is the pass-through opening for the foil mast in the torpedo-shaped propeller. Anyone have any ideas were we can buy or make something like this?
Title: Re: Foildrive motor
Post by: PonoBill on August 25, 2021, 09:09:17 AM
A really good bicyclist puts out 150 watts.

Sorry to be a pedant, but done a lot of cycling!

You're missing a 0 (a typo I'm sure!)

Should be 1500 watts, which will be close to peak, depending on what period you measure over

Nah. I should have been more precise about what I meant by "really good". I wasn't talking about the far end of the bell curve, just past the midpoint. 5 watts per kg is deep into the elite level, and irrelevant to the point--we're talking about what it takes to make the drive useful, not what is possible for a tiny number of dedicated athletes who probably would never pick up a paddle--bulks up muscles that are useless for bicycling. 1500 watts--you're dreaming unless perhaps you weigh 300kg with 2% body fat. If you can produce 1200 watts for a few seconds (20 watts per kg at 60kg--which is the average weight for elite climbers) you're in the company of a few hundred people on the planet.

Mark Ribcoff, here in Hood River, got one of the foildrives for downwind SUP foiling and is in love with the thing. I should probably just buy one, but can't make myself do it, so I'll build one. Fortunately, I don't have to commit a lot of resources to do that. I've got the two drive systems I bought to build an efoil and the towbot. They fit the narrow Takuma or Slingshot masts. The power cables run up the inside of the mast. I can actually just build what I need for an efoil and just turn the mast upside down and reroute the cables to position the motor close to the board instead of close to the foil. It won't be optimal position for the efoil, but damned close. I'll pick up a slingshot mast this morning and quit screwing around and get this done.

Title: Re: Foildrive motor
Post by: Hdip on August 25, 2021, 09:09:32 AM
Anyone have any ideas were we can buy or make something like this?

Besides the parts listed above. All your DIY info for efoil stuff comes from foil.zone

This thread for example was made back in 2019.

https://foil.zone/t/mini-motor-for-sup-surfing/4192/3
Title: Re: Foildrive motor
Post by: Esteban on August 25, 2021, 11:45:09 AM
quite an interesting thread....heres another thought. If your foil board had a couple thruster boxes you could double up on that finbox Boost drives and use that to get you going enough to stay up pumping or riding on swell with the foil and the Boost drives would no longer be in the water adding drag? hmmm

Title: Re: Foildrive motor
Post by: SUPJorge on August 25, 2021, 07:22:43 PM
Pono, I'll take the other drive system and make two of everything else. I'll paypal you.

Ps. I'll do 1800 watts for a few seconds. Not bad at 59.
Title: Re: Foildrive motor
Post by: ninja tuna on August 25, 2021, 08:54:15 PM
Oh, I need one of these.  I could get a ton of use out of it.

and this was interesting.
https://www.uci.org/news/2019/track-sprinting-a-question-of-watts


Now add one of these on to all the new HA foils and small unbreaking wave spots are now your private playground

exhibit A for the jury

https://www.youtube.com/watch?v=vJMhKZkxNpw
Title: Re: Foildrive motor
Post by: PonoBill on August 26, 2021, 10:18:04 PM
So I made this today...  ...Foildrive on steroids. About 3500 watts with gear reduction to make it efficient. If this can't get my fat ass downwind foiling the next step is a jetpack.
Title: Re: Foildrive motor
Post by: PonoBill on August 26, 2021, 11:59:08 PM
I'm going to have to shim the heck out of that plate--this silly board has way too much rocker. Once all the flipsky parts come I'll have this beast up and running in a week or so. I think I'm going to do about the same size battery they do. Probably a little bigger because I'm gonna do 14S: 52V . If it leaks a little current I might stun a few salmon.
Title: Re: Foildrive motor
Post by: JonathanC on August 27, 2021, 01:29:04 AM
Hey Bill, thatís a weapon!
Iím very keen to make some sort of mast mount foil drive, at 140 pounds donít need the steroid version and would be interested to hear if you think I could power it with one of the Stihl garden equipment batteries we have. There is a 36v 261 Wh. battery, Stihl have a belt battery socket, effectively a portable socket which simplifies connections (all mounted in waterproof box). That battery will run a full size lawn mower for a crazy long time, surely it can get my skinny arse up onto some downwind waves.
I donít know what Iím looking at in terms of motors/controllers and would welcome any tips, particularly regarding suitability for 36v. Possibly the Flipsky F4125 but no clue if this would have enough grunt for foil drive application.
Thanks
Title: Re: Foildrive motor
Post by: SUPJorge on August 27, 2021, 08:40:04 AM
Pono,

That looks serious! How much weight do you estimate it will it add, when all's said and done? Any thoughts about going with a folding prop for smoother "touch and go's".
Title: Re: Foildrive motor
Post by: PonoBill on August 27, 2021, 09:47:46 AM
The drive weighs 4 pounds. Controller and battery is an open question. If I just want to go for the lightest weight and assume I'm going to do just a few boosts I could keep it all down to maybe 3-5 more pounds, otherwise 10-15 pounds more. For a folding prop to be worthwhile I'd need to delete the shroud. So no. I can duplicate some of the effects in software by setting an idle RPM.
Title: Re: Foildrive motor
Post by: PonoBill on August 27, 2021, 10:00:43 AM
Hi Jonathon, yeah, that would almost certainly have enough to boost you up. it's a lot more than you'd get with a paddle. And yes, that's probably enough battery for your application. The 4125 is 400 watts, by my estimation, that's about 4 to 6X what you might possibly generate with a paddle. With a 261 wh battery and intermittent use you'd get a couple of hours out of it.

My version is absolute overkill, I'm just using something I already have. I think the guy who built these, Jake Barnhill, is in Australia. You might want to get in touch with him. In his video he hits 46km/h using this drive. Like I said--absolute overkill, I'll probably never use more than a finger brush on the throttle. https://foil.zone/t/complete-geared-motors/11512
Title: Re: Foildrive motor
Post by: Vancouver_foiler on September 22, 2021, 09:15:07 PM
Hi Jonathon, yeah, that would almost certainly have enough to boost you up. it's a lot more than you'd get with a paddle. And yes, that's probably enough battery for your application. The 4125 is 400 watts, by my estimation, that's about 4 to 6X what you might possibly generate with a paddle. With a 261 wh battery and intermittent use you'd get a couple of hours out of it.

My version is absolute overkill, I'm just using something I already have. I think the guy who built these, Jake Barnhill, is in Australia. You might want to get in touch with him. In his video he hits 46km/h using this drive. Like I said--absolute overkill, I'll probably never use more than a finger brush on the throttle. https://foil.zone/t/complete-geared-motors/11512

PonÚ Im dyin' to see you blast off with that thing man-step in it eh
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