# Propulsion System - Motors, Gears, etc **URL:** https://foil.zone/t/propulsion-system-motors-gears-etc/29 **Category:** Propulsion System (Motor, Gears) **Created:** [October 15, 2017, 3:04pm UTC](https://foil.zone/t/propulsion-system-motors-gears-etc/29 "2017-10-15T15:04:03Z") **Posts on this page:** 1 **Showing post:** 408
### Author: ![PowerGlider](https://foil.zone/user_avatar/foil.zone/powerglider/32/3670_2.png) [@PowerGlider](https://foil.zone/u/PowerGlider) #### Post date: [July 3, 2018, 9:06pm UTC](https://foil.zone/t/propulsion-system-motors-gears-etc/29/408 "2018-07-03T21:06:43Z")
No problem with IP, but it makes the discussion meaningless in an open source forum. On the other hand, like a collegue told me: All patents about electric motors have been done already. There is nothing really new. But it is an interesting field anyhow, with many small optimizations. > **[Running inrunner in water?](https://foil.zone/t/running-inrunner-in-water/2065/6)** > > i have already waterproof the cables and connectors, i was suprised i didn’t have any troubles with that, waterproofing the motor shaft , bearing is impossible, and i an more concerne with the water that stay between the windings, very hard to... > **[Direct drive outrunner with direct water cooling](https://foil.zone/t/direct-drive-outrunner-with-direct-water-cooling/570)** > > This is a solution for keep it simple stupid. I started in late 2016 as i saw e-foil vids. This was my new hobby. I dealt with electric vehicles, motor design and control, sailing, flying and designing and building modelplanes, windsurfing before... > **[Custom Direct drive motor](https://foil.zone/t/custom-direct-drive-motor/1527/8)** > > @ after testing with KV we need to make the Can longer to get the KV any lower than 200. I’m making a new sample to send to @pacificmeister it will need to be a 56114. How long do you want the shaft the sample should be done this week. > **[Peters Concept (Bavarian style)](https://foil.zone/t/peters-concept-bavarian-style/330/5)** > > After some further development I landed at the current concept: What I use is: Board: Naish Hover 160 with 20l RC: AlienPowersystems (for electric skateboards) and a waterproof document bag Prop: Yamaha 7 1/2 x7 (biggers are more efficient... and many more… The cooling with low Kv direct drive is a challenge. If you solve the cooling issue (e.g. by water inside), at least the ohmic losses do not destroy the motor. The truth is, the lower the RPM, the lower the power, so gearboxes are often used. So yes, we have a lot of compromizes and you can build a series of custom motors. --- _[View the full topic](https://foil.zone/t/propulsion-system-motors-gears-etc/29)._