still waiting for my boost fin – aiming for assisted surf foil riding.
Some people posting on seabreeze forum about a similar but much heavier duty and more expensive version from Australia:
Seems kinda halfway to an efoil, aimed at downwind sup foiling.
$165 for a 3D printed mast clamp 
Oof… $600 for a 6S 12A battery! At least throw a BMS in there. I wonder if he did anything to the motor or just grabbed it off the shelf. Actually if anyone knows How what covering he used for the phase cables and their connectors id really like to know.
I bet the creator is someone here… They probably grabbed the mast files from the mast section 
The easiest way to do the phase cables like that is to get a pipe/tube with a thin wall, then use a reinforced section (like a brass tube) for where the gland clamps over.
I bet you are right Jezza. And I think it may highlight an important business principle: it’s not about designing the better mousetrap, it’s about marketing it successfully.
I am obsessed with foiling, can’t get enough … but the tech threads on here are so intense, I can’t follow them, much less design my own motor assisted unit. So if someone is able to take the info users are sharing here and make something sellable, that’s a valuable service. Though personally I am too cheap to buy one. 
Oh, foildrive.com.au brings some nice points:
1- a working plastic folding prop !
2- a Maytech remote control mount that adapts to paddle shafts or windfoil booms
In August 2019, I submitted the e-wingfoil idea. Happily, it was taken up and implemented. Long live foildrive.com.au who dared to reuse a Maytech remote control and who will surely replace it soon by a more adapted solution.
There’s a much less complicated and lighter way to get up wingfoiling in light wind. Use a big wing and pump the wing and foil like crazy! I’ve gotten up in 8 knts this way before and any less you can’t ride the wing anyway.
The real advantage in wing foiling would be figuring out how to get up on a really small board (20L) when its moderate wind, but I feel the best solution for that would be some kind of floatation device.
The battery box looks kind of nice anyone know where it is sourced from?
Would like to build a similar contraption.
It’s just a clear lid ip67 junction box with latches. Quite a lot of them online if you Google the right thing.
That is what I precisely want to avoid as it destroys your wing, this way wears it out prematurely.
It is also exhausting and at times only marginally successful. I figure just the slightest boost would help to break the water tension … once the board breaks the surface, you don’t need much wind to stay up.
But the goal for me is actually more about sup foiling … days when the waves are standing up but not quite breaking and you just barely can’t catch them. This could open up spots otherwise unrideable. Meaning: all the waves for me Me ME.
and another, maybe halfway between the boost fin and foil drive, at $900ish.
https://www.aquamarina.com/bluedrive-s/
Not even close to an e-foil of course, but would it have enough juice to get up on step to ride swell, wing, or pump from there?
240W is not enough, might help a bit in swell but in flat water you need between 2000 and 3000W to get on the foil (depending on weight, board volume and wing). I think everthing below 1000W is not a big help.
Thank you, that helps…so W is one of the main measures? (probably a super kook question)
I see boost fin is 800W…that’s more in ballpark.
Foil Drive didn’t give W on their website but other thread says motor is 6374 flipsky…so that appears to be 3200-3500W
Source on this pic? Reverse image search leads back here
Credit to Paul aka @rcjetman in April 2019. It is his profile picture.
'Mini motor for SUP surfing
Did your idea work, using the Boost fin to get up on foil? Would really appreciate hearing about your experience so far. Thank you.
still waiting for the Boost fin to arrive. These kickstarter things can take a long time, hasn’t helped by Covid. I have at times wondered if it might actually be a scam, where they are using $ from new orders to pay for the refunds of those who ask. But I decided to stick with it and see.
The more I know about efoils, the less confidence I have that it will work … really low power compared to the FoilDrive 9374 type motor. However, where I want to use it is those “just barely” days, where you can almost get into the wave or up on the wing foil, but not quite, and maybe just a slight “boost” will get you on foil. I will post a report within 24 hours of getting mine! 
Any updates? Some of these are now in customers hands. Curious if anyone has attempted to foil with one.
based on facebook group post, not yet…
also waiting on mine to get a bit extra push during light wind wingfoiling