# Waterproof connection between mast and board
**URL:** https://foil.zone/t/waterproof-connection-between-mast-and-board/5374
**Category:** Propulsion System (Motor, Gears)
**Created:** [August 21, 2019, 9:41am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374 "2019-08-21T09:41:51Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@theone](https://foil.zone/u/theone)
#### Post date: [August 21, 2019, 9:41am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/1 "2019-08-21T09:41:51Z")
Continuing the discussion from [New Direct Drive Inrunner 65150](https://efoil.builders/t/new-direct-drive-inrunner-65150/3840/310):
@SoEFoil We’re off-topic but…my 2c: what you consider as your mold could be your plate (with obviously some modifications around the mast + screw holes) filled with a silicon seal as my above pict (@Jezza credit David from FR). Seal thickness: plate pocket depth + 1mm.
Better still, you could create an inner waterproof pocket inside the silicone to welcome the 3+1 connectors. 🤨
Like that:
1- no mast below the electrical box: the mast is fixed to the whole board thickness and not to the 2 or 3cm of the bottom of the waterproof box,
2- no water ingress from the board bottom. A 40° chamfer facing the board nose would then be welcome.
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### Author:  [@theone](https://foil.zone/u/theone)
#### Post date: [August 21, 2019, 9:44am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/2 "2019-08-21T09:44:14Z")
@SoEFoil I like the way you think very creative.
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 21, 2019, 10:04am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/3 "2019-08-21T10:04:56Z")
What is the purpose of this thread, are we trying to create a waterproof seal between mast and board?
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### Author:  [@theone](https://foil.zone/u/theone)
#### Post date: [August 21, 2019, 10:16am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/4 "2019-08-21T10:16:03Z")
ok yes as well as any other accessories
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### Author:  [@SoEFoil](https://foil.zone/u/SoEFoil)
#### Post date: [August 21, 2019, 10:38am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/5 "2019-08-21T10:38:21Z")
At least 2 possibilities:
A- Thin plate without connectors like FR + modified pict below to let the 3+1 tubes
B- Thick square seal with a pocket in a thick plate to welcome the 3 electrical connectors + [water quick disconnect coupling made by CPC like LIFT](https://www.hindawi.com/journals/au/2014/765756/fig3/). The thick plate (mount mold.jpeg ) could be recessed into the board to be flush with the board bottom.
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 21, 2019, 11:19am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/6 "2019-08-21T11:19:13Z")
Sorry, my response was not meant to be harsh. It was simply a more direct question.
So I have 2 solutions for the above.
- For the FR motor unit I use an FR style setup with either 3 or 4 holes (depending on whether there is a water-cooling pipe or not).
- For a motor unit with silicone wiring I simply fill the top section of the mast with marine silicone (silicone bonds to silicone wires). Then I use a 1.5mm-3mm rubber gasket sandwiched between board and mast mount.
Both the above methods provide a good seal and are simple. They also allow simpler construction for the boards without the need for extra connectors and special pockets.
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### Author:  [@theone](https://foil.zone/u/theone)
#### Post date: [August 21, 2019, 11:45am UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/7 "2019-08-21T11:45:41Z")
The transition from the original thread was a bit clunky sorry guys for the confusion, (nothing harsh) I appreciate the way @SoEFoil saw a solution of a seal even when the original intent was a mold this is an example of why this site is great we share concepts & inspire each other. Thanks
Alex
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### Author:  [@Vincentbraillard](https://foil.zone/u/Vincentbraillard)
#### Post date: [August 21, 2019, 12:41pm UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/8 "2019-08-21T12:41:01Z")
Hi
A topic already exist:
> **[Waterproof Interface between mast and Board](https://foil.zone/t/waterproof-interface-between-mast-and-board/3932)**
>
> Hello Here we can share all possibilities to have good waterproof interface between mast and board in order to disassemble it.
Please merge both discussion
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### Author:  [@SoEFoil](https://foil.zone/u/SoEFoil)
#### Post date: [August 21, 2019, 2:08pm UTC](https://foil.zone/t/waterproof-connection-between-mast-and-board/5374/9 "2019-08-21T14:08:06Z")
A very documented thread indeed… let’s merge the present thread with the earlier one in the present thread order (@theone, @SoEFoil, @Jezza
… and delete this one 👌