# Inflatable Foil box questions (before build)
**URL:** https://foil.zone/t/inflatable-foil-box-questions-before-build/26618
**Category:** Build, Repair & Mod
**Created:** [June 17, 2026, 10:56am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618 "2026-06-17T10:56:00Z")
**Posts on this page:** 17
**Page:** 2
### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [June 18, 2026, 5:56am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/21 "2026-06-18T05:56:01Z")
@DIYfoiler where are you based? I have some inflatable boards, but you would still need to build the box (haven’t had time to build them yet, but do have some designs).
In terms of building a box, Sifly have the most simple design with their hatch on their Rider board. A large Lip at the rear and then a single lightweight latch in the front:
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### Author:  [@DIYfoiler](https://foil.zone/u/DIYfoiler)
#### Post date: [June 18, 2026, 6:14am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/22 "2026-06-18T06:14:25Z")
I am from Vienna, Austria. Where are you?
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [June 18, 2026, 8:32am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/23 "2026-06-18T08:32:13Z")
I’m in the UK, so easy enough to post to you.
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### Author:  [@DIYfoiler](https://foil.zone/u/DIYfoiler)
#### Post date: [June 20, 2026, 9:30am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/24 "2026-06-20T09:30:36Z")
I’m very likely going to go with a Easyfoil TWO board and build my own box for it. The design step I’m most unsure about is the mast plate connection to the board. My idea was a thick aluminium plate on the bottom with threads, that would only get glassed over on the edges to expose the aluminium directly to the water.
The reason for it was ESC cooling. The ESC gets mounted inside a waterproof aluminium case that it going to sit on the other side of the thick plate and should transfer the heat into the water when it gets in contact. In theory that sounds good, but it feels like overkill.
My ESC will be the Flipsky 75100 Pro V2.0, but I’m open to suggestions. The motor will be a Flipsky 6384.
What do you guys think?
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### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [June 20, 2026, 10:31am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/25 "2026-06-20T10:31:43Z")
> [@DIYfoiler](#):
>
> 75100 Pro V2.0, but I’m open to suggestions. The motor will be a Flipsky 6384.
I would go with 75200 immediately, more reserve and better reliability for almost the same price
I think 6384 is a bit on the small side, the inflatable boards needs a little more power to get out of the water.. I run a 65161 on mine
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### Author:  [@DIYfoiler](https://foil.zone/u/DIYfoiler)
#### Post date: [June 20, 2026, 11:12am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/26 "2026-06-20T11:12:43Z")
thanks. the bigger ESC is probably worth it. i selected the motor due to some legal restrictions. can always upgrade in the future… 🙂
any feedback on the aluminium plate? The bigger ESC might not get as hot as the other one i guess
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### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [June 20, 2026, 4:30pm UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/27 "2026-06-20T16:30:10Z")
> [@DIYfoiler](#):
>
> any feedback on the aluminium plate? The bigger ESC might not get as hot as the other one i guess
I really like having the plate.. easy to mount the mast, simple and effective cooling.
Not sure how much weight it will add… 500-700g maybe compared to carbon plate?
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### Author:  [@DIYfoiler](https://foil.zone/u/DIYfoiler)
#### Post date: [June 21, 2026, 9:25am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/28 "2026-06-21T09:25:24Z")
i guess for a first build it would make sense to go with a design like this… The Gong mast plate uses M6 screws for the board connection, right? I was think about getting a 10mm plate in which i drill 8-9mm deep threaded holes. I think that should be sufficient for all the forces of the mast, right?
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### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [June 21, 2026, 9:49am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/29 "2026-06-21T09:49:17Z")
I used those (Blindnietmutter M8x29mm, stainless) and pressed in into the Alu plate
Hold solid, replaceable if the threads break, waterproof
(You need the version that’s closed on the end, the image is open)
Like this maybe
[https://www.ebay.de/itm/394019153321](https://www.ebay.de/itm/394019153321)
I still have many left and can send you a few within EU
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [June 21, 2026, 10:37am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/30 "2026-06-21T10:37:16Z")
What thickness did you use and did it cover the entire base section?
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### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [June 21, 2026, 10:38am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/31 "2026-06-21T10:38:27Z")
I bought the box ready-made from easyfoil… I think its a 5 or 6mm plate, the whole bottom area
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [June 21, 2026, 10:40am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/32 "2026-06-21T10:40:12Z")
In my calculations a 700mmx400mmx5mm plate weighs 3.78kg. the same in carbon is only 700g. So it’s actually a 3kg weight difference.
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### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [June 21, 2026, 10:44am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/33 "2026-06-21T10:44:00Z")
I thought carbon fiber is ~1.5 g/cm³ while Alu is 2.7 g/cm²
So Alu is 1.8x heavier, in your example (I think the plate is smaller) the Alu plate should be 3.8kg while carbon should be 2.1kg, not 700g??
Here a old video how my box looks: [https://www.youtube.com/watch?v=cn1bBH9-ofo](https://www.youtube.com/watch?v=cn1bBH9-ofo)
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [June 21, 2026, 10:44am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/34 "2026-06-21T10:44:57Z")
The carbon is a carbon foam sandwich so is not a solid plate.
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### Author:  [@ludwig\_bre](https://foil.zone/u/ludwig_bre)
#### Post date: [June 21, 2026, 10:49am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/35 "2026-06-21T10:49:58Z")
Makes sense
I have no experience with composites, if that sandwich is enough to spread all mast forces into the surroundning board I guess thats a substantial weight saving indeed.
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### Author:  [@DIYfoiler](https://foil.zone/u/DIYfoiler)
#### Post date: [June 21, 2026, 11:00am UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/36 "2026-06-21T11:00:54Z")
i’m not planning to do a full cover plate. only embed a 210x140x10mm plate into the bottom. that give me around 2cm on each side to glass over on the bottom side, to its sandwiched in…
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [June 21, 2026, 5:56pm UTC](https://foil.zone/t/inflatable-foil-box-questions-before-build/26618/37 "2026-06-21T17:56:57Z")
Basically run a carbon plate to secure the mast inserts. Then run 2-3 carbon stringers full length. Kinda similar to carbon pump boards other than you don’t need the deck as solid. I’ve been hunting for simpler constructions and may have a good option but need to strength check it first.
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