# OKP's build - Another eFoil in France!
**URL:** https://foil.zone/t/okps-build-another-efoil-in-france/13978
**Category:** Builds
**Created:** [September 14, 2021, 7:42pm UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978 "2021-09-14T19:42:57Z")
**Posts on this page:** 20
**Page:** 6
### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 16, 2021, 9:58pm UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/101 "2021-11-16T21:58:05Z")
update of the day.
The primary parts of the battery box are done. They are PETG with fast printing quality and I will just use them for the structure and thickness. I will epoxy glass fiber inside and carbon fiber outside. This will bring the strength of the box. I could even go for Aramide.
To ensure I’m bulletproof with the battery pack. I will make some drills between each cell (on the PETG cell holder) and fill with high temperature silicone. This will make the pack ROCK solid… up to 1100°C.
not sure it’s necessary but I have as well another option which is to pot the battery with molding silicone that can last up to 250°C and up to 350°C. It’s not so expensive for 1kg. This may bring more heat than anything else at cell level; that’s why I’m not 100% sure about going this route.
[https://polyestershoppen.fr/siliconenrubber/siliconen-gietrubber-shore-15-216.html?gclid=Cj0KCQiAys2MBhDOARIsAFf1D1cf8xqc82VhWNFfJZbG-LeNLst3LlyEMSc2BV\_U4iVs6cYpcAmA0s4aAgZ3EALw\_wcB](https://polyestershoppen.fr/siliconenrubber/siliconen-gietrubber-shore-15-216.html?gclid=Cj0KCQiAys2MBhDOARIsAFf1D1cf8xqc82VhWNFfJZbG-LeNLst3LlyEMSc2BV_U4iVs6cYpcAmA0s4aAgZ3EALw_wcB)
I’ve received as well the propellers from Flite. The MakerX should arrive tomorrow.
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### Author:  [@Manu](https://foil.zone/u/Manu)
#### Post date: [November 17, 2021, 6:16am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/102 "2021-11-17T06:16:17Z")
Hello Cedric,
Nice progress on your project. Personally I think that the potting of the battery cells can be a source of heat rise…
Concerning the propeller : can it be mounted without modification on a Flipsky 65161 ? Can you tell us the outside diameter of the propeller base?
Thanks
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### Author:  [@sat\_be](https://foil.zone/u/sat_be)
#### Post date: [November 17, 2021, 6:57am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/103 "2021-11-17T06:57:24Z")
See here: [Fliteboard prop alternative to FR? - #11 by superlefax](https://foil.zone/t/fliteboard-prop-alternative-to-fr/11465/11)
Needs to be drilled/lathed or reamed out to 12mm.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 17, 2021, 11:49am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/104 "2021-11-17T11:49:48Z")
good day all,
I’ve received the Maker X (the packaging was amazing, they take goods safety very seriously)
and the RS232 connector (that will go on the BMS side located outside).
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 17, 2021, 6:57pm UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/105 "2021-11-17T18:57:15Z")
moving ahead, I’ve drilled small holes and started to pour some high temperature silicate & silicone. This will ensure strength in the pack and avoid any cell collision should things go mad.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 17, 2021, 9:25pm UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/106 "2021-11-17T21:25:28Z")
following a PM, I decided to stop putting the silicate as this would act as a heater. I will finish to weld the pack with the nickel as I believe, it will be strong enough anyway. Using silicate/silicone was just a bad idea.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 7:25am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/107 "2021-11-18T07:25:41Z")
Hey @jeffM Jean Francois, do you have any insights about my battery pack structure? do you think it will handle shocks fine once fully welded? For the box, I’m also thinking about building one in AIREX that I will full reinforce with composites (carbon/GF) and that will be probably stronger. Not sure I’m overthinking here.
For all, as a side note and ass I’m outsourcing the BMS; I plan to add an adhoc temperature monitoring by drilling the battery box and to see how high the temperature went after a ride.
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### Author:  [@Dynamik](https://foil.zone/u/Dynamik)
#### Post date: [November 18, 2021, 9:10am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/108 "2021-11-18T09:10:51Z")
> [@okp](#):
>
> I’ve received as well the propellers from Flite.
I think getting a Flite propeller as a v1 propeller is a very good choice. In this price range ([https://www.custommotorsfrance.com/product/propeller-complete/](https://www.custommotorsfrance.com/product/propeller-complete/)) it is probably the best commercial propeller in the world at the moment.
However, enlarging the 12mm shaft hole requires a slow and careful procedure to ensure that the enlarged hole is not crooked or off axis. I think it is better to use a cutter instead of a drill (the cutter has a larger number of cutting edges). If a crooked or off-axis hole is still created, this defect can be corrected with additional modifications.
I am going to measure the propeller and publish its actual parameters (efficiency, thrust, …). Now I am waiting for a motor suitable for testing. I hope to be able to make the measurements before Christmas. Then I will refine the hydrodynamic shape of the propeller a bit, then measure the efficiency again. There is some hope that after increasing the efficiency it will match the hydrodynamic parameters of the FR propeller. Increasing propeller efficiency is a great hobby of mine.
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### Author:  [@Thom](https://foil.zone/u/Thom)
#### Post date: [November 18, 2021, 9:17am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/109 "2021-11-18T09:17:29Z")
What’s the dimension of your battery ?
For mine, I used this ABS box : [ABS box](https://fr.rs-online.com/web/p/boitiers-pour-usage-general/7721004/?relevancy-data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searchHistory=%7B%22enabled%22%3Atrue%7D)
It saves a lot of time building a box from scratch plus the cover is transparent so you can check inside at all time.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 9:23am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/110 "2021-11-18T09:23:34Z")
Thanks @Thom. This will be very helpful !
Do you have the internal dimensions of the box? I only see external dimensions
This is the raw dimensions my pack; but I would need a bit more of course to accommodate the Amphenol connectors and RS232 cable… and also the 200A fuse; but that’s not such a big deal (let’s say +3 cm on any side of the box). For the height. These are 21700; so 7cm and a bit of extra space for the welding and wires.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 9:27am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/111 "2021-11-18T09:27:54Z")
@Thom I believe your box may fit if I go for 14S8P (instead of 9P). That would save me A LOT of time but I’m going to loose 1P (4000mAH) but still it’s going to be a tight fit. I may need the same box, but a little larger (or longer) while still having 9mm height.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 9:47am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/112 "2021-11-18T09:47:33Z")
I found this one in aluminium : 400x300. Would be perfect. I know it’s not ABS or polycarbonate but it will save me a lot of time.
> **[Boîtier dissipateur RS PRO en Aluminium extrudé, 400 x 300 x 86mm, Noir IP40...](https://fr.rs-online.com/web/p/boitiers-pour-usage-general/1881269)**
>
> En commandant Boîtier dissipateur RS PRO en Aluminium extrudé, 400 x 300 x 86mm, Noir IP40 ou tout autre Boîtiers pour usage général sur fr.rs-online.com, vous êtes livrés en 24h et bénéficiez des meilleurs services et des prix les plus bas sur une...
> **[A700000006797097.pdf](https://docs.rs-online.com/5cd9/A700000006797097.pdf)**
>
> 2.08 MB
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### Author:  [@Thom](https://foil.zone/u/Thom)
#### Post date: [November 18, 2021, 10:13am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/113 "2021-11-18T10:13:14Z")
My Battery is a 12S10P and fits inside.
I had to cut some plastic parts inside the box bot overall it fits OK, with a Bluetooth Daly BMS + Antispark switch + fuse.
Also, to make sure everything is perfectly IP68 rated, I poored some Dielectric Gel inside.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 10:53am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/114 "2021-11-18T10:53:26Z")
yes but I believe you are using 18650 cells and not 21700 right. I know aluminium is conductive at a certain extend but I also think it’s a good heat dissipator. I could get this 400x300mm box and ensure everything is well isolated inside and at the very same time have more room for more air than just an ultra tight box.
what’s everyone view on using this IP40 box? I will make sure it’s waterproof with SIKAFLEX 11FC that will work perfectly on the joints.
It’s either this one in aluminium or this one but I will need to move from 14S9P to 14S8P
I’ve not gone away of making my own box but honestly if there already something there, I’ll go with that
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### Author:  [@sat\_be](https://foil.zone/u/sat_be)
#### Post date: [November 18, 2021, 10:57am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/115 "2021-11-18T10:57:44Z")
This aluminium box adds almost 2kg of weight which is a lot. You will have to carry your efoil, better keep it as light as possible.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 10:59am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/116 "2021-11-18T10:59:26Z")
thanks mate. so what would you recommend ?
I could do a square box with airex and put composites or just use the 302x232 box and go for polycarbonate instead of ABS but I still don’t know its weight.
Internal size is limited to 273x198mm so even a 14S8P will not fit adequately.
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### Author:  [@sat\_be](https://foil.zone/u/sat_be)
#### Post date: [November 18, 2021, 11:16am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/117 "2021-11-18T11:16:07Z")
ABS or PC should be lighter. If you don’t find one that fits, airex and glass is also an option but more work. It’s also safer to use an non conductive material for the battery box, just in case.
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 11:17am UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/118 "2021-11-18T11:17:29Z")
Yes; would you go for Airex/glass to replace the existing 3D printed gabarit that I did ?
Otherwise, I have a plan B that can work and which will require less work.
I could get a 344x289mm box… BUT with 117mm instead of 90mm (which is the maximum heigh that I can go for)… and just split it in two vertically… to remove around 2cm… and then both top and bottom part together with sikaflex 11FC.
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### Author:  [@sat\_be](https://foil.zone/u/sat_be)
#### Post date: [November 18, 2021, 1:21pm UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/119 "2021-11-18T13:21:03Z")
Hard to say, why not use the one you printed? You might need to coat it so it will be fully waterproof. At one point you need to decide and do it, you’re always more clever afterwards…
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### Author:  [@okp](https://foil.zone/u/okp)
#### Post date: [November 18, 2021, 3:29pm UTC](https://foil.zone/t/okps-build-another-efoil-in-france/13978/120 "2021-11-18T15:29:35Z")
thanks, well it’s 550 grams for just the PETG and all in all… I’ll go for Airex and get more clever! What’s sure is that it will be lighter.
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