Electric Surf Board

Boats, Jet Skis, Kayaks etc., including hovercrafts
fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 05 2019 7:15am

At the moment I am using 15 degrees.
What timing have you set up?
The battery was with a special prize 2000 Euros for 17 cells. But add on there is the BMS, which is nearly 600 Euros.
So not a cheap solution.
Have you installed an additional waterpump?

chris_kline   100 W

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Re: Electric Surf Board

Post by chris_kline » Oct 05 2019 7:19am

i was running 20 degrees, and the fets were getting close to max temp, then i increased to 25 degrees, and the fets were cooler by about 8 degrees.
im running cooling from the jet drive, but it pumps a lot of water through the system through 10 mm diameter hose
fets are stable around 60 degress c

chris_kline   100 W

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Re: Electric Surf Board

Post by chris_kline » Oct 05 2019 7:20am

yeah 2 thousand euros is a little on the pricey side

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 05 2019 7:51am

Chris which kind of motor is your actual model?
I will try that timing setting the next weekend.
I am really looking forward to see an influence.

If you are interested in such a battery, let mw know.
I am thinking about to buy a 30Ah version. So as a light back up. The 53 for the holidays and the ligther version for easy handling.

chris_kline   100 W

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Re: Electric Surf Board

Post by chris_kline » Oct 05 2019 9:38am

lehner 7050 with 5 windings

76mm prop with 70mm pitch, 52mm nozzle

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 05 2019 10:35am

Okay so the motors are more or less the same from their behaviour

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bigbore   10 kW

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Re: Electric Surf Board

Post by bigbore » Oct 08 2019 2:46pm

fabianpusch wrote:
Oct 05 2019 1:05am
https://youtu.be/hzqdDyQC6nw

Greetings from Corsica.

Your petrol powered board is amazing....really fast. Great job...and a perfect lake with best conditions. Where is it?
Very beautiful. :bigthumb:
Which MGM controller and jet drive are you using?

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 08 2019 3:28pm

Hi
It is the MGM 250-63 HBC - industrial version. It is more or less the same like the 400-63 RC version.
The jetpump is a modified 64 MHZ version.
By Fabian

ropower86   1 W

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Re: Electric Surf Board

Post by ropower86 » Oct 08 2019 4:59pm

fabianpusch wrote:
Oct 08 2019 3:28pm
Hi
It is the MGM 250-63 HBC - industrial version. It is more or less the same like the 400-63 RC version.
The jetpump is a modified 64 MHZ version.
By Fabian
Great job on your board, you have been working on it for long time. I have the jet 64 setup on my jetboard too but the battery pack cannot handle the load so I must go for a powerful battery setup.

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 09 2019 5:46am

Yes, you are right. The battery is the bottleneck.
It is not so easy to find a lightweight solution with a high output.
But at the meantime I am really thinking about to sell all the stuff...my partner is going mad with the first 2 boards hanging around and the actual one which is in our guest room 🤪

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 09 2019 5:49am

I also think, that the jetpump could be optimized e.g. more pitch.
Has anyone optimized the MHZ Jet?
I am also trying to build up a pump for 80mm, a target rpm 8000-9000....anyone interested

ropower86   1 W

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Re: Electric Surf Board

Post by ropower86 » Oct 09 2019 9:40am

fabianpusch wrote:
Oct 09 2019 5:49am
I also think, that the jetpump could be optimized e.g. more pitch.
Has anyone optimized the MHZ Jet?
I am also trying to build up a pump for 80mm, a target rpm 8000-9000....anyone interested
You know, mhz is not efficient at all because it needs to run high rpm which causes to many problem and losses. That is why Lampuga went under before it was bought also, those who had jet64 gave up because of the same cause. MGM ESC has a 32 bit system and Flier ESC has a 16Bit system there's a difference. They can work properly when the timing and PWM is tuned correctly. Too many variables to consider however, I came down to conclusion if you buy a mhz jet system you need to spend over $3k/€2.5k then you will see somewhat of a great success if you build the system right. The main issue is heat.. heat.. Heat. Motor gets hot to a certain Celius there is magnetic loss means pulling more current then controller gets hot and if the battery cannot handle the load well you know what is next. The 80mm pump is a great idea at 8000-9000 it will be manageable.

ropower86   1 W

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Re: Electric Surf Board

Post by ropower86 » Oct 09 2019 9:51am

I forgot to mention, I now have access to the best 3d printers in the world. Did a tour onsite and learned the machine operations to much to digest in learning. They can 3d print in metal too, which the service more expensive. Overall I see a future in production run for jet pump system using this company. May take a visit today.

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 09 2019 10:35am

That sounds cool, I am trying to animate a PhD in fluid technical systems and my old connections to Formula1. I think building up a jet is not impossible. The hardest thing is spending money for the itereations and the prototypes.
By the way, we have multi jet HP printer and also some DMLS metal printer in our company.
I have printed the frames for the opening and some other parts, really good and durable stuff...

FlorianAirs   10 µW

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Re: Electric Surf Board

Post by FlorianAirs » Oct 10 2019 10:55am

Hello,

I will sell my lampuga Air 2016 because i switch to a Jetsurf....

Best Regards:)
https://www.ebay-kleinanzeigen.de/s-anz ... 3-241-2930

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 10 2019 12:04pm

Cool, I have seen it already.
Are you buying the defect Jetsurf?

Bluefang   10 kW

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Re: Electric Surf Board

Post by Bluefang » Oct 13 2019 7:04pm

FYI anyone have any thoughts on the pumps from the following supplier, they also have a 55mm and 80mm setup. Not so sure about the impellers. I am just hoping there are options to get metal impellers.
https://www.aliexpress.com/item/4000147 ... 72a8NA0K0b

This guys youtube is a riot too, with great info.
https://www.youtube.com/watch?v=6GRExuEdd5A&t=255s
Building high powered electric vehicles.
http://www.facebook.com/ausemoto
Goldenmotor dealer in Queensland, Australia.

ropower86   1 W

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Re: Electric Surf Board

Post by ropower86 » Oct 13 2019 7:26pm

fabianpusch wrote:
Oct 09 2019 10:35am
That sounds cool, I am trying to animate a PhD in fluid technical systems and my old connections to Formula1. I think building up a jet is not impossible. The hardest thing is spending money for the itereations and the prototypes.
By the way, we have multi jet HP printer and also some DMLS metal printer in our company.
I have printed the frames for the opening and some other parts, really good and durable stuff...
How does the frames hold up for you and what material did you use? Im thinking about doing the same as of printing out the lid frame and a battery box. That is cool you work where you can use the facility 3d printers.

ropower86   1 W

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Re: Electric Surf Board

Post by ropower86 » Oct 13 2019 7:30pm

Bluefang wrote:
Oct 13 2019 7:04pm
FYI anyone have any thoughts on the pumps from the following supplier, they also have a 55mm and 80mm setup. Not so sure about the impellers. I am just hoping there are options to get metal impellers.
https://www.aliexpress.com/item/4000147 ... 72a8NA0K0b

This guy youtube is a riot too, with great info.
https://www.youtube.com/watch?v=6GRExuEdd5A&t=255s
The impeller is CNC aluminum. I have the jet 64, was thinking about the jet 80 but I believe you have to invest more in batteries, stronger BLCD motor, and ESC to handle the output from the jet pump.

FlorianAirs   10 µW

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Re: Electric Surf Board

Post by FlorianAirs » Oct 14 2019 5:12am

fabianpusch wrote:
Oct 10 2019 12:04pm
Cool, I have seen it already.
Are you buying the defect Jetsurf?
I have buy a new jetsurf race dfi:)

pepe pisa   10 µW

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Re: Electric Surf Board

Post by pepe pisa » Oct 15 2019 10:19am

Hi guys..
by any chance someone has the esc file of the Lampuga boost carbon??
I have completely redone it and I just miss the file to put in the esc to finish it and try it.

I tried to enter all the data by hand but not knowing the engine features and a mess!!

chris_kline   100 W

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Re: Electric Surf Board

Post by chris_kline » Oct 18 2019 1:48pm

fabianpusch wrote:
Oct 09 2019 10:35am
That sounds cool, I am trying to animate a PhD in fluid technical systems and my old connections to Formula1. I think building up a jet is not impossible. The hardest thing is spending money for the itereations and the prototypes.
By the way, we have multi jet HP printer and also some DMLS metal printer in our company.
I have printed the frames for the opening and some other parts, really good and durable stuff...
hi fabian
what dmls machines do you have? im curious how much it would cost to laser sinter me a 2 stroke engine block/cylinder in aluminium.
p.s. did you try adjusting your motor timing

fabianpusch   1 W

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Re: Electric Surf Board

Post by fabianpusch » Oct 19 2019 1:14am

Hi Chris
To ask for a est. prize I need the building volume...or something like this.
But the metal parts are really expensive. What about CNC?

chris_kline   100 W

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Re: Electric Surf Board

Post by chris_kline » Oct 19 2019 2:28am

i can cnc the crank case, but the cylinder/block has exhaust/transfer ports that can only be achieved with either wax loss casting, or dmls.
i got some parts quoted dmls a few years ago for my company, was cheaper back then to wax loss cast, but both were extremely expensive. i was wondering if the dmls tech had gotten quicker and cheaper over the last few years.

ill send some files when i have them, see what the price comes out as, but the idea was to do extremely thin sidewall, which would make dmls more competitive.

thanks

srn   10 W

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Re: Electric Surf Board

Post by srn » Oct 20 2019 5:56am

I have a 3D printed steel impeller. Ordered it at i.materialise.com
There you can upload your file and instantly get a price.

The print quality is impressive

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