Electric Surf Board

[fabianpusch]

Hi Chris
Second hand, a 2016 race.
Waiting for some nice weather to ride it.
Actually I have sent the board to Jetsurf, so they can do a big check up

[Louiss]

Hi Guys, I haven't been here for a long time. I was so busy meantime and I didn't have enough time to my electric surf. Project stays as it is, it rides but it was a little slow, battery last only 15min. and so on. For this season I decided to rebuild the surf for something more compact and light. I leave the rigid board and go to inflatable small size SUP board. The propulzion will be my old Torqueedo housing with 7:1 gear reduction, new Turnigy G160 Brushless Outrunner 290kv, torqueedo speed prop, 120A HV controller, 10Ah 12s Lipol battery pack, 2.4GHz remote controller. All this stuff except for batteryes monted in to torqueedo housing, the batt in waterproof box on tail top side on SUP. All this stuff will be detachable like a conversion kit from paddle to electric SUP.
Actually I ordered the parts needed mostly from HK, and Ali when stuffs arrives I will share my building progress.
Meantime I made a small research whats new on this scene, and I find this guy who made a similar thing, check it: https://www.youtube.com/watch?v=QBKDYsAhiuc

[chris_kline]

if anyones interested in a build video, https://www.youtube.com/watch?v=p6V4zLt6Xys

[fabianpusch]

Cool video really nice and your location too.
Actually I am building up a lot of things for the Jetsurf...new plates for a binding, a hydraulic throttle....

[chris_kline]

Cool video really nice and your location too.
Actually I am building up a lot of things for the Jetsurf...new plates for a binding, a hydraulic throttle....

hydraulic throttle, sounds cool, what components are you using? might have to add that

[fabianpusch]

https://www.fechtner-modellbau.de/fahrz ... olben/?p=1

Something like that. Actually I am doing a little experiments with the actuator from Magura. They have a acutator for the hydraulic clutch...

[nelsonset]

I'm going to 3d print a jet drive and do a few experiments. Was wondering what is the best way to seal the driveshaft from water? diagrams would be really appreciated or even a video.

[Louiss]

Hi Folks,
I decided to try out the Boston Swing 5300 mAh Li-ion cells. Batt configuration is 8p 12s, overall capacity is 42Ah. Not tested yet on full load, only on 20-30A, but the batteries seems to be soft. Charged to near 50V, and the voltage drops to 48V under 30A load. That indicates the batteries has high internal resistance. Not great for high C discharge. I'am curious how they perform under full load. Here some pictures about batteries:
https://www.rajce.idnes.cz/f1439398734

[fabianpusch]

Hi
Nice build of the battery.
I think you are right, if they are dropping by 2V, with a load of just 20-30A, they are not really suitable for a higher load like 150A it more. What are the specs from the manufacturer?
Bye Fabian

[Louiss]

here is the thread about it: viewtopic.php?f=14&t=90938&hilit=boston+swing

[Neo709]

if anyones interested in a build video, https://www.youtube.com/watch?v=p6V4zLt6Xys

Amazing job!