# Concept suggestions needed

**URL:** https://foil.zone/t/concept-suggestions-needed/2488
**Category:** Electronics (ESC, remote, batteries)
**Created:** [August 11, 2018, 4:09pm UTC](https://foil.zone/t/concept-suggestions-needed/2488 "2018-08-11T16:09:29Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![johnrc](https://foil.zone/letter_avatar_proxy/v4/letter/j/cc9497/32.png) [@johnrc](https://foil.zone/u/johnrc)
#### Post date: [August 11, 2018, 4:09pm UTC](https://foil.zone/t/concept-suggestions-needed/2488/1 "2018-08-11T16:09:29Z")

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Hello builders world…i’m newbie John from Greece

I start making a project and i need your thoughts…

Watching this instructable video [https://www.google.gr/amp/www.instructables.com/id/Underwater-Wrist-Thruster-185-Mph/%3Famp\_page=true](https://www.google.gr/amp/www.instructables.com/id/Underwater-Wrist-Thruster-185-Mph/%3famp_page=true)

i decided to make a small sea scooter board,on this board: [https://www.gidivestore.com/eu/en/buoys/9723-sporasub-eva-board.html](https://www.gidivestore.com/eu/en/buoys/9723-sporasub-eva-board.html)

🤣🤣🤣🤣🤣🤣…but i dont know many things so i need your help.  
I bought from their suggestions the following:

1.DT700 brushless motors: 2 pcs (i will run them parallel always at 30A,the easy way is to stuck the potensiometer to 30 A and use an run -off switch for the hole system but i dont know where to connect…Am i correct or …

1. Kort nozzle for DT700: 2 pcs

2. ESC speed controller 40A with BEC(i think from the price is garbadge…)  
[https://m.ebay.com/itm/For-RC-Helicopter-40A-ESC-Brushless-Motor-Speed-Controller-BEC-3A-Accessory-/292583179808?txnId=1587784451019](https://m.ebay.com/itm/For-RC-Helicopter-40A-ESC-Brushless-Motor-Speed-Controller-BEC-3A-Accessory-/292583179808?txnId=1587784451019)

3. [https://m.ebay.com/itm/RC-SERVO-TESTER-prova-servocomandi-a-3-funzioni-modellismo-auto-moto-elicotteri-/222569015914?txnId=2111217347012](https://m.ebay.com/itm/RC-SERVO-TESTER-prova-servocomandi-a-3-funzioni-modellismo-auto-moto-elicotteri-/222569015914?txnId=2111217347012)

4. 10K Linear Slide Slider Electronic Potentiometer Module Dual Output Arduino

5. Sony Konion US18650VTC6 3120mAh - 30A.I think that 3s10p is a good choice for about an hour runtime,

My questions:  
1.do i need fuse?what A and where to place it?  
2.which waterproof on -off switch and where to connect?  
3.is it safe to use those servo tester, potensiometer and esc?or sth else?  
4. What bms?with or without ballance etc.  
5.all in a ip67 box or separate the li-ion pack from the esc?  
Thanks in advance