# Swabian Efoil build

**URL:** https://foil.zone/t/swabian-efoil-build/14556
**Category:** Builds
**Created:** [November 20, 2021, 12:31pm UTC](https://foil.zone/t/swabian-efoil-build/14556 "2021-11-20T12:31:19Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![leachim](https://foil.zone/letter_avatar_proxy/v4/letter/l/43a26b/32.png) [@leachim](https://foil.zone/u/leachim)
#### Post date: [November 24, 2021, 10:09am UTC](https://foil.zone/t/swabian-efoil-build/14556/4 "2021-11-24T10:09:54Z")

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I found out that my current problem is more about a shortcut between to power chords 😅.  
But the ESC needs defenetly cooling for Summer. But to keep the overall concept as easy as possible. I am actually Planning to add a passive Cooling Plate on top of the Box similar to @sat_be s Build: [Daniels (un)geared inflatable (slowly built) - #72 by sat\_be](https://foil.zone/t/daniels-un-geared-inflatable-slowly-built/8069/72)  
I think this could be enough cooling for my \< 2,2KW mechanical Output power.

I made some progress on the folding prop thematic. I have now a working version that gives me ~60-70W/km at ~15-18 km/h foiling with the 6384 120Kv at 10S. And almost no drag when folded. Unfolding works almost perfect. But maybe i gonna need there some slight improvments. Also the durability is under investigation.  
Its also pretty hard to balance the transfere from powered drive to glide without falling in the water ^^

I started also to make some simulations and optimize everything to low pressure and low turbulences:

 ![PropStrömung](https://foil.zone/uploads/default/original/3X/4/0/40502abb6759fa2d6b485603998b041193311fb3.jpeg)  
 ![Strömung](https://foil.zone/uploads/default/original/3X/6/c/6ca0697159c376f83d79964fbd34f8d45fbaaef1.jpeg)  
 ![Proppressure](https://foil.zone/uploads/default/original/3X/6/a/6a37f30fc464c807b626506961626aacf7fae599.jpeg)  
 ![Druck](https://foil.zone/uploads/default/original/3X/5/0/50499d8fd1cf9b3360b3764fd415c150c7f4bdfa.jpeg)

In addition i tryed to implement a debugger for the folding Prop.  
So i just started to film it:

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> Sieh dir diesen Beitrag auf Instagram an
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> ](https://www.instagram.com/reel/CWp5o2YD6Dr/?utm_source=ig_embed&utm_campaign=loading)
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> [Ein Beitrag geteilt von Michi (@thermikdreher)](https://www.instagram.com/reel/CWp5o2YD6Dr/?utm_source=ig_embed&utm_campaign=loading)

 

There where some interesting findings in the Video:

1. I consume ~3kw from the battery with the camera underwater → so i defently need a Software limitation of the max current.
2. The unfolding is not perfect.
3. Folding works amazing
4. I have some Kavitation on the Proptips. But this seems to be quite normal compared to other Propvideos. But would be nice if some of you could make some own/post theyr Videos.

As promised here are the .STL files of my current Folding Prop design:  
[KlapppropV4](http://kitegruppe.de/downloads/KlapppropV4.STL)  
[BaseV3](http://kitegruppe.de/downloads/BaseV3.STL)

I printed it with PETG and very thick outer layer. You need 35mm M4 Screws and M4 Nuts.  
Very important: the Prop must unfold fold just my gravity when changing its orientation. So sand it as long as it runs freely! If opening goes even a little bit hard. Its not working properly in the water and gonna have a short life. Hard openings goes massively on lifetime!  
In future i probably gonna make the angle of the folding props maybe a bit bigger. So drag is higher but it opens much better. This here is a try how far back it could fold…

I am Curious about your Feedback.

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