# Weak, no power, wont fly

**URL:** https://foil.zone/t/weak-no-power-wont-fly/21210
**Category:** Build, Repair & Mod
**Created:** [July 14, 2024, 10:30pm UTC](https://foil.zone/t/weak-no-power-wont-fly/21210 "2024-07-14T22:30:37Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![ValinMorgunis](https://foil.zone/letter_avatar_proxy/v4/letter/v/c6cbf5/32.png) [@ValinMorgunis](https://foil.zone/u/ValinMorgunis)
#### Post date: [July 14, 2024, 10:30pm UTC](https://foil.zone/t/weak-no-power-wont-fly/21210/1 "2024-07-14T22:30:37Z")

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Hello all,

Im calling out for help again; bottom line - board has no power and barely moves through the water. I’ve turned off phase filters and run FOC detection- all goes smoothly.

 ![1000170116](https://foil.zone/uploads/default/original/3X/7/5/75fc8db8f1b7c01aa97f174ced3b23fb88cecd85.jpeg)

 ![1000170122](https://foil.zone/uploads/default/original/3X/9/0/90b8c081bc1733a625fe3e7ef9d21d32d861d6e0.jpeg)  
 ![1000170120](https://foil.zone/uploads/default/original/3X/0/c/0cc243229c76d704033cc3d9a054c091f9ab8353.jpeg)  
 ![1000170121](https://foil.zone/uploads/default/original/3X/8/f/8ff666b555c4fb80e62b49d54ef4cd8009647318.jpeg)  
 ![1000170123](https://foil.zone/uploads/default/original/3X/f/f/ffa90a94285a6fe3b9965e38d8f3420509496930.jpeg)

Thoughts??

Current build: 5’ x 5" Fiberglass board ~40lbs with electronics, battery, foil.

VESC: Flipsky FSESC 75200 watercooled controller.  
Motor: Flipsky 65161 120KV  
Controller: VX3 Controller.  
Battery: 64V 5200mAh (50c lipo)

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### Author: ![Larsb](https://foil.zone/user_avatar/foil.zone/larsb/32/31021_2.png) [@Larsb](https://foil.zone/u/Larsb)
#### Post date: [July 15, 2024, 8:48am UTC](https://foil.zone/t/weak-no-power-wont-fly/21210/2 "2024-07-15T08:48:19Z")

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Show a vesc log running it, with current, voltage and rpm and pictures of your setup.  
Do you reach 100% throttle when you’re pressing it?  
Which propeller?  
Are you using duct?  
Is there a watt limit defined in vesc?

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### Author: ![Foliengriller](https://foil.zone/letter_avatar_proxy/v4/letter/f/9d8465/32.png) [@Foliengriller](https://foil.zone/u/Foliengriller)
#### Post date: [July 15, 2024, 8:51am UTC](https://foil.zone/t/weak-no-power-wont-fly/21210/3 "2024-07-15T08:51:09Z")

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Your absolute Power of 3800W looks quite ok - you should be able to fly with this amount of Power - depending on technique, wing and board.  
Other than that I would believe that your battery is the limiting factor: It is VERY small for an efoil; normally we are seeing 20Ah and up in order to limit the current per cell.  
Assuming 64V means 15s configuration, you will have ~3,8V per cell best case meaning 57V under load which means you are pulling 67A or 12c out of your battery: For a good LiPo this should be about the limit for sustained (\>5s) load; forget the outrageous 50c claim…  
I would recommend to try a bigger (min 12Ah) battery with a realistic 10-15c rating.